Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

PHYSICS (625 journals)            First | 1 2 3 4 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 37)
International Journal of Biological, Physical and Chemical Studies     Open Access  
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 7)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Engineering and Applied Physics     Open Access  
International Journal of Fatigue     Hybrid Journal   (Followers: 41)
International Journal of Fracture     Hybrid Journal   (Followers: 14)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 43)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 16)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 2)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 15)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 7)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 11)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 12)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 3)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 15)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 12)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 14)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 13)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 13)
International Journal of Multiphysics     Open Access  
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 9)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 8)
International Journal of Nonlinear Dynamics and Control     Hybrid Journal   (Followers: 6)
International Journal of Physics     Open Access   (Followers: 10)
International Journal of PIXE     Hybrid Journal  
International Journal of Plasticity     Hybrid Journal   (Followers: 7)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 3)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 13)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 17)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 19)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 9)
International Materials Reviews     Hybrid Journal   (Followers: 15)
Iranian Journal of Medical Physics     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jambura Physics Journal     Open Access  
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 10)
Journal of Advanced Physics     Full-text available via subscription   (Followers: 13)
Journal of Advances in Physics     Open Access   (Followers: 13)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 9)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 7)
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 34)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 59)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 250)
Journal of Computational and Theoretical Transport     Hybrid Journal   (Followers: 2)
Journal of Computational Methods in Physics     Open Access   (Followers: 8)
Journal of Computational Physics     Hybrid Journal   (Followers: 60)
Journal of Computational Physics : X     Open Access   (Followers: 1)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 17)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 4)
Journal of Experimental Physics     Open Access   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Geometry and Physics     Full-text available via subscription   (Followers: 2)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 144)
Journal of Gravity     Open Access   (Followers: 4)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 26)
Journal of High Energy Physics     Hybrid Journal   (Followers: 17)
Journal of High Energy Physics, Gravitation and Cosmology     Open Access   (Followers: 2)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 8)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 14)
Journal of Low Frequency Noise, Vibration and Active Control     Open Access   (Followers: 8)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 22)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 7)
Journal of Materials Science     Hybrid Journal   (Followers: 26)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 2)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 1)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 10)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 25)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 24)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multiscale Modeling     Hybrid Journal   (Followers: 1)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Nonlinear Dynamics     Open Access   (Followers: 6)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 2)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access   (Followers: 6)
Journal of Optics     Hybrid Journal   (Followers: 17)
Journal of Photonics for Energy     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 19, SJR: 2.461, CiteScore: 3)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 8)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 22)
Journal of Porous Materials     Hybrid Journal   (Followers: 4)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 3)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Rheology     Full-text available via subscription   (Followers: 7)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 4)
Journal of Scientific Research     Open Access  
Journal of Sensors     Open Access   (Followers: 25)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Physics     Open Access   (Followers: 8)
Journal of Spectroscopy     Open Access   (Followers: 6)
Journal of Superconductivity and Novel Magnetism     Partially Free   (Followers: 1)
Journal of Synchrotron Radiation     Open Access   (Followers: 3)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 31)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of the Physical Society of Japan     Hybrid Journal   (Followers: 2)
Journal of Theoretical and Applied Physics     Open Access   (Followers: 9)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 11)
Journal of Vibration and Control     Hybrid Journal   (Followers: 43)
Journal of Visualization     Hybrid Journal   (Followers: 3)
Journal of Zhejiang University : Sceince A     Hybrid Journal  
JPSE (Journal of Physical Science and Engineering)     Open Access  
Jurnal Fisika     Open Access  
Jurnal Ilmiah Pendidikan Fisika Al-Biruni     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Online of Physics     Open Access  
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kasuari : Physics Education Journal     Open Access  
La Rivista del Nuovo Cimento     Hybrid Journal  
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Letters in High Energy Physics     Open Access  
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Light : Science & Applications     Open Access   (Followers: 3)
Living Reviews in Computational Astrophysics     Open Access   (Followers: 3)
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 2)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 6)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 2)
Magnetic Resonance     Open Access  
Magnetic Resonance Letters     Open Access  
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 30)
Matéria (Rio de Janeiro)     Open Access  
Materials and Design     Open Access   (Followers: 47)
Materials at High Temperatures     Full-text available via subscription   (Followers: 3)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 8)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 44)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 22)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 15)
Materials Science and Technology     Hybrid Journal   (Followers: 40)
Materials Today Physics     Hybrid Journal   (Followers: 1)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 3)
Matter and Radiation at Extremes     Open Access   (Followers: 1)
Meccanica     Hybrid Journal   (Followers: 1)
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 6)
Mechanics of Materials     Hybrid Journal   (Followers: 25)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 2)
Mechanics Research Communications     Hybrid Journal   (Followers: 4)
Medical Physics     Hybrid Journal   (Followers: 17)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 11)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Instrumentation     Open Access   (Followers: 57)
Modern Physics Letters A     Hybrid Journal   (Followers: 14)

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Similar Journals
Journal Cover
Journal of Vibration and Control
Journal Prestige (SJR): 0.763
Citation Impact (citeScore): 2
Number of Followers: 43  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1077-5463 - ISSN (Online) 1741-2986
Published by Sage Publications Homepage  [1174 journals]
  • Data extrapolation and sound field reconstruction based on the boundary
           element method

    • Free pre-print version: Loading...

      Authors: Zixin Zhang, Youhong Xiao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Near-field acoustic holography (NAH) based on the boundary element method (BEM) is a powerful tool for noise source identification which is the premise of noise control. For large-scale structures, the measurement aperture should be large enough to ensure that the reconstruction results are accurate. However, the layout of field points often cannot meet the conditions necessary for reliable measurements. The patch NAH methods proposed in previous literature do not explore the influence of the initial and extrapolated aperture on the reconstruction of the vibration velocity. In this paper, the field distribution modes are redefined by the BEM and applied to extrapolation technology. First, the sound pressure of the field points on an expanded hologram is obtained by a data extrapolation method. The expanded data can then be used to reconstruct the vibration velocity of the structure and the sound pressure in the sound field via BEM-based NAH. A modified Tikhonov regularization is utilized in the inverse process. Different sound sources with simple or complex radiated sound fields are used for simulations to explore the influence of the initial and extrapolated aperture on the reconstruction. The application scope of the proposed extrapolation technology is identified and the conclusions are verified by experiments.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-23T11:49:02Z
      DOI: 10.1177/10775463221110049
       
  • A novel instantaneous frequency estimation method for operational
           time-varying systems using short-time multivariate variational mode
           decomposition

    • Free pre-print version: Loading...

      Authors: Shuaishuai Liu, Rui Zhao, Kaiping Yu, Baopeng Liao, Bowen Zheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Operational modal identification of time-varying systems plays a crucial role in assessing the health condition and controlling the dynamic properties of engineering structures. However, only the response is measurable, making it challenging. Based on the variational mode decomposition (VMD) theory, this paper presents a short-time multivariate or multi-channel VMD (STMVMD) method for instantaneous frequency (IF) identification of time-varying structures in the case of output-only measurements. The idea of short-time windows overcomes the shortcoming of many VMD-based methods that employ the narrowband assumption of intrinsic mode functions (IMFs) and cannot decompose non-stationary signals involving closely-spaced wideband IMFs. After obtaining the multivariate IMFs by STMVMD, an average scheme is employed to estimate IFs, reducing the noise sensitivity of Hilbert Transform. Moreover, by tracking the center frequencies of STMVMD at different moments, another more noise-robust IF estimation method is also presented. A series of numerical and experimental examples illustrate the advantages of the proposal.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-23T05:53:26Z
      DOI: 10.1177/10775463221109699
       
  • Extracting non-stationary signal under strong noise background:
           Time-varying system analysis

    • Free pre-print version: Loading...

      Authors: Zhen Shan, Zhongqiu Wang, Jianhua Yang, Dengji Zhou, Houguang Liu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The extraction of non-stationary feature information under strong noise background is a difficult problem. In this paper, a novel general time-varying scale transformation aperiodic stochastic resonance is proposed to extract and enhance the weak non-stationary signal under strong noise background. The theoretical framework of a parameters time-varying Duffing system is built for aperiodic stochastic resonance. By studying the resonance region migration when scale coefficient takes different values, an optimal scale transformation is achieved. Also, the time-varying system is optimized with cross-correlation coefficient as the index. Compared with the existing methods, the proposed method can be applied to stronger noise background and has stronger noise robustness. When under the same noise background, the proposed method can provide output with higher signal-to-noise ratio and higher cross-correlation coefficient. Finally, experimental analysis of faulty bearing vibration signal verifies the high accuracy, which indicates a good signal extraction and enhancement ability of the proposed method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-18T12:06:27Z
      DOI: 10.1177/10775463221109715
       
  • Practical finite-time consensus of multi-agent systems with unknown
           nonlinear dynamics and the asymmetric input dead zone

    • Free pre-print version: Loading...

      Authors: Mehdi Zamanian, Farzaneh Abdollahi, Seyyed Kamaleddin Yadavar Nikravesh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates the practical finite-time consensus problem for heterogeneous multi-agent systems with unknown nonlinear dynamics, the asymmetric input dead zone, and external disturbances under directed topology. The model of heterogeneous multi-agent systems is composed of first-order and second-order dynamics. First, we show that under the proposed protocol, the sliding mode surface converges to a compact set in finite time. Then, we prove that the position errors and the velocity errors (for second-order agents) between any two agents reach a small desired neighborhood of the origin in finite time. In this approach, adaptive neural networks are employed to compensate for the nonlinear dynamics of agents. By applying sliding mode control, the external disturbances and the imperfect approximation of neural networks are rejected. The approach of the adaptive compensator plus dead zone is applied to overcome the asymmetric input dead zone. Besides, our proposed protocol is fully distributed, which means that the global graph information is not required beforehand by adaptive control gains. The effectiveness of our proposed protocol is finally validated through numerical simulations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-17T07:56:03Z
      DOI: 10.1177/10775463221105931
       
  • Robust tracking for nanopositioning stages using sliding mode control with
           active disturbance rejection: Design and implementation

    • Free pre-print version: Loading...

      Authors: Guangwei Wang, Bo Wang, Jin Zhao, Meng Tao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper presents the design and implementation of a novel sliding mode control integrated with active disturbance rejection (SMCDR) for precise robust trajectory tracking of piezoelectric nanopositioning stages. The model uncertainties, nonlinearity, and external disturbances of the piezoelectric nanopositioning stage are regarded as a lumped disturbance, which is estimated by an extended state observer. The active disturbance rejection control (ADRC) strategy is used to realize a preliminary trajectory tracking, while the sliding mode control is adopted to handle the estimation error and residual uncertainties, and to improve the tracking performance. The exponential stability of the proposed SMCDR is proved using Lyapunov’s direct method. The proposed SMCDR controller combines the strength of both ADRC and sliding mode control, exhibits a simple structure, requires only the position measurements, and does not require any information of model parameters except for an approximate constant gain. Experimental results reveal the robustness of the SMCDR approach in suppressing the hysteresis of piezoelectric actuator, and illustrate the superior performance over conventional ADRC, integral sliding mode controller (ISMC) and PID controller for trajectory tracking control of piezoelectric nanopositioning stages.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-17T06:47:40Z
      DOI: 10.1177/10775463221106016
       
  • Adaptive sliding mode control of switched linear systems using disturbance
           observer based on the RBF neural network

    • Free pre-print version: Loading...

      Authors: Jaber Hosseini, Zahra Rahmani, Abolfazl Ranjbar Noei
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study deals with analyze of an adaptive sliding model controller for a class of switched linear systems in the context of model reference adaptive control (MRAC) using RBF neural network (RBFNN) with the aid of disturbance observer (DO). For this purpose, adaptive laws and switching rules are designed. These are constructed based on tracking error and sliding mode control, together with using time-dependent switching conceptualizations. A DO is used to estimate the external disturbance with an adaptive RBFNN which is applied to obtain the external disturbance upper bound estimation, combined with an adaptive sliding mode control (ASMC) under the identic Lyapunov stability framework. The switching rules are based on dwell time (DT) and average dwell time (ADT) switching. The ASMC updates the system dynamics so that it assures the proposed closed-loop switched linear system stability via fast switching, resulting in the form of globally uniformly ultimately bounded (GUUB) stability. The convergence of the process of updating the weights in the adaptive RBFNN and the boundedness of updated estimates of weights are satisfied. Achieving the state tracking, robustness, reducing the chattering problem and anti-disturbance performance are the main objectives. Moreover, switching rules based on the mode-dependent approaches have been developed, which can allow faster switching as compared to switching rules based on the DT and ADT. Finally, to evaluate the efficiency of the obtained theoretical results, the controller and the proposed method have been tested on the electro-hydraulic system (EHS).
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-14T09:48:05Z
      DOI: 10.1177/10775463221107446
       
  • Investigation of active vibration control strategy aiming at global
           vibration suppression

    • Free pre-print version: Loading...

      Authors: Yuying Han, Meiping Sheng, Qiaojiao Li, Xiaohan Fu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Active vibration control (AVC) effect of the classical strategy is mainly restricted to a limited region around the error sensor, while the structural vibration at other locations may be dramatically enlarged. The enlargement is non-negligible when the global vibration suppression is considered. Aiming at this enlargement, an indicator is presented to reveal the effect of the classical strategy on the whole controlled structure. By establishing a cost function related with the indicator, an improved AVC strategy is proposed. Utilizing the proposed strategy, an optimized secondary force is obtained to achieve the global vibration suppression. Numerical simulations of AVC are undertaken on a typical plate to verify the superiority of the proposed strategy. Results demonstrate that the proposed strategy is still effective to achieve the global vibration suppression at frequencies where the classical strategy fails. This performance indicates that the proposed strategy is advantageous for global vibration suppression by attenuating the total input power, which provides more attraction for the actual application of AVC.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-14T02:14:19Z
      DOI: 10.1177/10775463221108241
       
  • Adaptive Fuzzy Asymptotic Tracking for Nonlinear Nonstrict-feedback
           Systems With Input Quantization

    • Free pre-print version: Loading...

      Authors: Jiaxu Sun, Yuan-Xin Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This article investigates an adaptive fuzzy tracking control problem for the nonlinear nonstrict-feedback systems with quantized input. The control signal has a new transformation since a time varying auxiliary signal and a hyperbolic tangent function are introduced to the controller. Moreover, a novel adaptive fuzzy control scheme is proposed such that input quantization can be solved by applying hysteresis quantizer in the case of unknown quantization parameters. For traditional adaptive quantization control schemes with nonstrict-feedback form, current studies have shown that the tracking error can only converge to a small neighborhood of the origin. Based on the proposed control method, all the signals in the closed-loop system are bounded, and the tracking error can converge to zero asymptotically. Finally, the effectiveness of the presented method is shown via the numerical simulation results.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-10T06:55:31Z
      DOI: 10.1177/10775463221106022
       
  • Active and passive fault tolerant control allocation strategy for
           nonlinear systems

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      Authors: Salman Ijaz, Hamdoon Ijaz, Mirza Tariq Hamayun, Umair Javaid
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This article introduced fault-tolerant control (FTC) schemes for over-actuated affine non-linear uncertain systems. The proposed methodologies incorporate two different control allocation (CA) units with high-level nonlinear adaptive sliding mode control (NLASMC) strategy. The first FTC strategy is active that utilizes an online CA unit to effectively manage the redundant actuators towards the chosen flight path in faulty conditions. On the other hand, the second FTC scheme is passive based on the idea of a fixed CA scheme and does not require control-input reconfiguration during the faulty condition. A robust NLASMC law is selected to enforce the state trajectories converges to the sliding manifold despite the uncertainty in the model dynamics and external disturbance effect. The proposed schemes are then applied to the nonlinear F16 aircraft detailed model equipped with thrust vectoring (TV) control. The nonlinear simulations on 6-degree-of-freedom (6-DOF) F16 aircraft are performed under the failure of the aileron, rudder, and elevator. It can be visualized that both schemes performed well, but online CA scheme can cope with more faults and failures combinations in comparison to fixed CA schemes. Furthermore, both FTC approaches performed well when compared to existing methods in the literature.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-10T03:12:53Z
      DOI: 10.1177/10775463221097763
       
  • Rayleigh-like waves in multilayered elastic media containing voids: Use of
           the Haskell matrix method

    • Free pre-print version: Loading...

      Authors: Aarti Khurana, Savkirat Kaur, SK Tomar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Using the Haskell matrix method, the dispersion relation of Rayleigh-like surface waves propagating through a multilayered elastic solid half-space is derived. Each layer as well as the half-space is assumed to have voids (pores) distributed evenly throughout. This dispersion relation is then reduced for a 2-layered model (single layer over a half-space) to study the characteristics of phase speed of Rayleigh-like wave. For a particular model, the numerical computations are performed to observe the effect of voids on the fundamental mode of Rayleigh-like waves for n = 2 and 3. For the 2-layered model, it is also shown that the particle motion remains elliptical but influenced by the presence of voids. In the absence of voids from the model, the dispersion relation earlier obtained by Haskell (1953) for the case n = 2 is recovered successfully.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-10T02:57:33Z
      DOI: 10.1177/10775463211072688
       
  • Solution of optimal control problems governed by volterra integral and
           fractional integro-differential equations

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      Authors: Sedigheh Sabermahani, Yadollah Ordokhani, Kobra Rabiei, Mohsen Razzaghi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this manuscript, we investigate two categories of optimal control problems (OCPs), OPCs via fractional Volterra integro-differential equations and Volterra integral equations. Touchard wavelets as an appropriate class of bases are defined to develop a new hybrid scheme for the considered problems. To this approach, Riemann–Liouville fractional integral operator (RLFIO) of Touchard wavelets is achieved exactly using the Hypergeometric functions. Next, by approximating the fractional derivative of the state variables and control variables using the mentioned wavelet functions, applying RLFIO, collocation method, and Gauss–Legendre quadrature formula, the considered problems are inserted into systems of algebraic equations, which can be solved using “FindRoot” package in Mathematica software. Numerical results are presented that validate the theory and show the effectiveness of the established technique.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-10T01:59:04Z
      DOI: 10.1177/10775463221105923
       
  • Experimental study on construction vibration during different phases of
           diaphragm wall-supported deep excavation and its influence on indoor
           sensitive receivers

    • Free pre-print version: Loading...

      Authors: Yung-Yen Ko, Liang-Yu Lai, Gang-Hui Lee, Yu-Fang Wang, Shih-Wei Jao, Tzu-Fun Fu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Construction vibration during deep excavation supported by diaphragm walls was experimentally investigated. First, measurement on the ground vibration induced by panel excavation for diaphragm wall installation was made inside a construction site. Results showed that the vibration level during excavation was much higher than ambient vibration at most frequencies, especially near the fundamental frequencies of the ground and the grab, and the strongest vibration was induced by the grab impacting the ground and guide walls. At another site, indoor ground-borne vibration was measured at two zebrafish laboratories at B1 and 3F of adjacent buildings during phases of existing pavement demolition, panel excavation, and basement excavation. The behavior of zebrafishes was observed simultaneously to examine the influence of vibration. Pavement demolition caused considerable increase in vibration level at B1 for nearly all frequencies, whereas at 3F the increment was more remarkable yet limited to a narrower bandwidth. Excavation of both panel and basement slightly enhanced the vibration magnitude at B1 at frequencies above 63 Hz or higher yet was hardly influential at 3F. Zebrafishes at B1 exhibited more startle response than those at 3F in all phases possibly because the construction vibration at B1 fell within the frequency range of vibration detection of zebrafishes. According to ISO 2631-1, this indoor vibration was perceptible to people only in some situations yet caused no discomfort.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-08T11:54:36Z
      DOI: 10.1177/10775463221107211
       
  • Adaptive Masreliez–Martin fractional interpolatory cubature Kalman
           filter with recursive noise estimation

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      Authors: Jing Mu, Feng Tian, Changyuan Wang, Jianlian Cheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, we propose a Masreliez–Martin fractional interpolatory cubature Kalman filter and an adaptive Masreliez–Martin fractional interpolatory cubature Kalman filter to design the estimators for fractional-order discrete-time nonlinear systems under non-Gaussian measurement noise and unknown process noise covariance. Ther Masreliez–Martin fractional interpolatory cubature Kalman filter is developed by extending the interpolatory cubature Kalman filter to the fractional nonlinear discrete system to increase the robustness of estimation under noisy environment by applying the Masreliez–Martin method, including both time update and measurement update. Meanwhile, the adaptive Masreliez–Martin fractional interpolatory cubature Kalman filter is put forward to enhance the state estimation adaptive to the fractional system with uncertain process noise through recursive estimation. Simulation results on the re-entry target tracking system have demonstrated the adaptiveness, robustness and effectiveness of the propose filters.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-08T05:42:02Z
      DOI: 10.1177/10775463221106835
       
  • Enhancement neural control scheme performance using PSO adaptive rate:
           Experimentation on a transesterification reactor

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      Authors: Farhat Yassin, Zribi Ali, Atig Asma, Ben Abdennour Ridha
      Abstract: Journal of Vibration and Control, Ahead of Print.
      An arbitrary choice of the neural controller adaptive rate can have a negative effect on the performance of the closed-loop system. In this study, we propose a novel methodology for neural controller adaptive rate using Particle Swarm Optimization algorithm. The developed control scheme is composed of a recurrent neural networks emulator and controller with decoupled adaptive rates. Constraints on the adaptive rate are derived from the Lyapunov stability method. Particle Swarm Optimization is proposed as a mechanism to optimize the adaptive rate of the NC to improve the closed-loop performances. The advantages of the proposed new control algorithm are as follows: (1) online optimal choice of adaptive rate, which reduces the effort for searching an adequate neural controller adaptive rate when considering the conventional methods and (2) ensuring stability, faster convergence, disturbance rejection, and good tracking. The efficiency of the proposed PSO adaptive rate is demonstrated with numerical control of SISO nonlinear system. The obtained results prove the efficiency of the proposed NC compared to those obtained with existing methods. An application of the developed approach on a semi-batch reactor is presented to validate simulations results.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-07T06:32:18Z
      DOI: 10.1177/10775463221105698
       
  • On stability of SDOF systems with delayed position and velocity feedback

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      Authors: Luis Hernández-Villa, Daniel Melchor-Aguilar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, we study the stability problem of a single-degree-of freedom system with delayed position and velocity feedback, which can be found in the modeling of several engineering problems in control and vibration. For this class of delay system, we derive some necessary and sufficient conditions for delay-dependent exponential stability. These conditions determine a region in the feedback gains space for assuring the delay-dependent exponential stability. We show how the results can be applied to control and delayed resonator (DR) problems.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-06T12:58:22Z
      DOI: 10.1177/10775463221100065
       
  • Longitudinal vibration characteristics analysis of nonlocal rod structure
           with arbitrary internal elastic supports

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      Authors: Deshui Xu, Jun Lu, Kun Zhang, Pengzhou Li, Lei Sun
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This manuscript obtained an exact solution for longitudinal vibrating characteristics of generally restrained nanorod structure with multiple internal elastic supports via an improved Fourier series method. Due to the nonlocal elasticity theory, the general boundary restraints have been formulated by introducing artificial springs. Then, classical boundary conditions can be easily realized by setting the restrained stiffness to zero or infinity accordingly. Energy formulation is derived for describing longitudinal vibration characteristics of generally restrained nanorod with multiple internal elastic supports. To improve the differential continuities at the elastically restrained boundary, nonlocal longitudinal vibrating displacement is expanded as the standard Fourier series combined with auxiliary polynomials, which makes the field function sufficiently smooth in the calculation region. By making use Rayleigh–Ritz procedure, the unknown coefficients can be obtained by solving the standard eigenvalue matrix. Then, numerical results are presented and compared with those in the literature to illustrate the reliability and effectiveness of the current model. The influence of parameters of the multiple internal elastic supports, nonlocal structural parameters, and boundary restraints on vibration characteristics are discussed and analyzed. This study provides an effective method for predicting longitudinal vibration characteristics of a generally restrained nanorod with multiple internal elastic supports, in which the nanorod has complex boundary and coupling conditions.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-06T01:41:50Z
      DOI: 10.1177/10775463221106534
       
  • Delay-dependent and order-dependent stability and stabilization analysis
           of variable fractional order uncertain differential systems with
           time-varying delay via linear matrix inequality approach

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      Authors: Chunxiu Wang, Xingde Zhou, Xianzeng Shi, Yitong Jin
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper concentrates on the robust stability and stabilization analysis of variable fractional order uncertain differential systems with time-varying delay. Firstly, by using a suitable Lyapunov–Krasovskii function and constructing an appropriate variable fractional order inequality, a novel delay-dependent and order-dependent stability theorem of the nominal systems is proposed. Then, based on the above stability conditions, the robust delay-dependent and order-dependent stability conditions for the uncertain systems are discussed. Moreover, in order to stabilize the nominal and uncertain systems, state feedback controllers are also derived with the help of the presented stability criteria. All the results are in the form of linear matrix inequalities. Finally, two numerical examples are provided to verify the effectiveness of the introduced theoretical formulation.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-06T01:37:31Z
      DOI: 10.1177/10775463221085334
       
  • Demodulated time-direction synchrosqueezing transform and its applications
           in mechanical fault diagnosis

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      Authors: Xiaolu Li, Baosen Xiao, MingAng Guo, Baolin Liu, Jingbo Xia, Xiaotong Tu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Time-frequency analysis is recognized as a dynamic tool to analyze the nonstationary signal. The synchrosqueezing transform is usually applied as a post-processing method to further improve the readability of the time-frequency representation. Synchrosqueezing transform is related to the reassignment method and can be performed in two directions, namely time direction and frequency direction. Frequency-direction reassignment helps to squeeze the slowly changing ridge. However, the time-direction reassignment is efficient to process the signal with rapid variation in instantaneous frequency. Thus, there exists a conflict in most of the time-frequency analysis methods while dealing with a signal containing both of these two components. In this study, a new method called demodulated time-direction synchrosqueezing transform is introduced, which is not only capable of achieving a higher compact TFR but also allow reconstructing the mode. In order to explain demodulated time-direction synchrosqueezing transform, a signal model is established in frequency domain. Then, a demodulated procedure is implemented to eliminate time-frequency analysis diffusion. Finally, time-direction reassignment is carried out to further enhance the energy concentration of the time-frequency analysis. The proposed demodulated time-direction synchrosqueezing transform method is evaluated by both simulation and experimental research. The results reveal that the performance of demodulated time-direction synchrosqueezing transform is better than the conventional time-frequency analysis methods, and it can be applied to the fault diagnosis in a machine.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-04T02:32:19Z
      DOI: 10.1177/10775463221106524
       
  • [math] and [math] optimal designs of tuned inerter dampers for base motion
           excited structures with inherent damping

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      Authors: Tiancheng Xu, Yancheng Li, Tao Lai, Shaoqi Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Tuned inerter damper (TID) has recently gained increasing attention as a new structural control mechanism for seismic protection of structures. Currently, theoretical investigations are undertaken by researchers to reveal its fundamentals and to understand its underline principles in altering the structural performances of structures against dynamic loadings. However, the comprehensive study of optimization design of TID for undamped structures is lacking and the majority of the research focuses on the optimization of TID for structures without any damping. This research evaluates the [math] and [math] optimal designs of TIDs on the structures with damping. Using SDOF structure as an example, the frequency response function of the system equipped with TID underground motion excitation is obtained. The [math] and [math] designs of TID for structures without damping are derived considering various response parameters using analytical method. A numerical search method is utilized for the [math] and [math] designs of TID for structures with damping; meanwhile, a set of explicit formulae are obtained by curve-fitting for convenience in the application. Finally, the relative motion response of the inerter is explored, and an optimal design formula of TID which can reduce the displacements of primary mass and inerter simultaneously, is proposed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-02T04:59:30Z
      DOI: 10.1177/10775463221102254
       
  • Analysis of two-dimensional nonlinear sloshing in a rectangular tank by
           using a concentrated mass model

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      Authors: Tatsuhiro Yoshitake, Satoshi Ishikawa, Takahiro Kondou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Major problems can occur when liquid sloshes in a tank, such as in liquid storage tanks during an earthquake, and this is an important engineering problem to address. To analyze this phenomenon, the finite-element method is generally used but involves many degrees of freedom when the tank is large. In this paper, a nonlinear numerical model with relatively few degrees of freedom is established for vertical and horizontal two-dimensional nonlinear sloshing in a rectangular tank excited horizontally. In addition, a method is proposed for reducing the number of degrees of freedom in the two-dimensional model. The natural frequencies, modes, and frequency responses are then compared among the concentrated mass model, theoretical calculations, and experimental results. Good agreement was achieved among them, thus demonstrating the validity of the model.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-02T02:02:31Z
      DOI: 10.1177/10775463221095934
       
  • A study on the dynamic characteristics of the new type of prefabricated
           slab ballastless track structure for urban rail transit applications

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      Authors: Mengxuan Ye, Zhiping Zeng, Hualiang Zeng, Qingwu Ruan, Zhibin Huang, Abdulmumin Ahmed Shuaibu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In order to solve the thorny problem of maintenance and repair of cast-in-place monolithic track slab, a new type of prefabricated slab ballastless track structure is developed for ordinary sections and damping sections. This study uses dynamics software to establish a vehicle-ballastless track coupling dynamics model, to explore the dynamic properties of the new type of prefabricated ballastless track structure in ordinary and damping sections. The model is verified using field measurement to prove its reliability. Based on the results obtained in the study, the following conclusions are deduced: (1) The vertical displacement of the floating slab in the damping section is increased by 82.95 times compared with the ordinary section. However, the vertical acceleration of the tunnel wall is reduced by 90.48%, while the insertion loss of vertical vibration acceleration of the tunnel wall is 11.08 dB, which meets the requirements of the code (CJJ/T 191-2012). (2) As the stiffness of the damping cushion increases, the vertical displacements of the rail and track slab are reduced by 43.25% and 56.68%, respectively, while the insertion loss of the vertical vibration acceleration is reduced by 31.28%. (3) As the damping increases, the vertical acceleration of the tunnel wall increases by 75.96%, whereas the insertion loss of the vertical vibration decreases by 30.51%. When the damping or the stiffness of rubber cushion is greater than 0.132 MN·s/m3 or 0.0231 N/mm3, the damping does not meet requirements. (4) When the thickness of the floating slab is increased from 200 mm to 350 mm, the vertical accelerations of the floating slab and the tunnel wall are reduced by 35.79% and 41.35%, respectively, whereas the insertion loss of the vertical vibration acceleration is increased by 37.36%.
      Citation: Journal of Vibration and Control
      PubDate: 2022-06-02T01:15:41Z
      DOI: 10.1177/10775463221104561
       
  • Multi-shaker shock response spectra replication control

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      Authors: Ronghui Zheng, Yi Ma, Xiaohui Wei, Huaihai Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Shock vibration environments frequently occur and threaten the reliability of products in aerospace engineering. This work deals with the shock response spectra replication control method for multi-shaker vibration test systems. Two synthetic methods for reconstitution of shock response signals with specified shock response spectra are presented. One is the random delay superposition method and the other is the filtering superposition method. The former utilizes a random time delay vector satisfying a normal distribution to simulate a shock response signal with symmetrical attenuated oscillation features while the latter is employed when the measured shock records are available. A time-domain inverse system method is formulated to obtain the multi-input drive signals based on a finite-difference equation. The multi-input multi-output frequency response functions are estimated first and then used to construct the inverse system. The multi-output shock response spectra are calculated by response signals from control sensors. A closed-loop iteration control procedure is provided to correct the drive signals according to the deviations between the responses and corresponding reference values. A numerical simulation and a triaxial vibration test are carried out and the results show the feasibility and effectiveness of the proposed methods.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-31T06:42:03Z
      DOI: 10.1177/10775463221104577
       
  • On the non-linear dynamics of vehicle shimmy coupled with handling
           motions: modelling, bifurcation analysis, and validations

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      Authors: Hangyu Lu, Jianwei Lu, Heng Wei, Lei Shi, Shenyong Ye
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A novel vehicle dynamic model considering the coupling mechanism between the front wheel shimmy and the vehicle lateral handling motions is established to investigate the interacting effect between the steering shimmy instability and the general motion instability, that focuses especially on the influence of the tyre force saturation induced by lateral-longitudinal coupling when different degrees and allocation strategy of braking force are applied. The typical 3-degree-of-freedom front wheel shimmy structure of dependent suspension is dynamically modelled by using the Lagrange method, alongside the equations for plane vehicle handling motions introduced. The stretched-string-based tyre kinematic equations, that describe the transient tyre-road contact status, are proposed by analytically deriving the coupling relations between the angular shimmy variables and vehicle motion status. A theoretically approximated linear tyre model, based on the coupling between vertical, longitudinal, and lateral directional forces, is analytically derived for stability analysis. Meanwhile, a complete PAC-2002 tyre model, with experimentally identified parameters, is employed for simulation verification. The stability chart of linear stability analysis shows the variation of the system bifurcation curves and stable parameter region under different parametric configurations, which gives that the degrees and allocations of braking force largely affect the stable parameter domain and the global stability. The variations of the system characteristic roots indicate that both Hopf and S-N bifurcation could happen due to shimmy oscillations and destabilization of motion, respectively, and their co-existence at certain parameter domains make the dynamic behaviour further unpredictable and complex. Numerical simulation verifies the dynamical characteristics of shimmy, and further analysis shows that three types of vehicle motion instability which coexisted with shimmy instability could be triggered by the coupling effect. In addition, the variation law of limit-cycle amplitude under varying vehicle driving inputs is summarized, and finally, a preliminary experiment is conducted for validations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-28T12:43:06Z
      DOI: 10.1177/10775463221096258
       
  • Observer-based adaptive neural network control design for projective
           synchronization of uncertain chaotic systems

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      Authors: Ahsene Boubakir, Salim Labiod
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper addresses the design of an observer-based adaptive neural network chaos synchronization scheme for a general class of uncertain chaotic systems. The controller consists of an adaptive neural network control law and an extended state observer. The parameterization of the designed extended observer and the sufficient stability conditions are derived in the light of the singular perturbation theory. The extended observer is incorporated into the controller to reconstruct the synchronization error vector as well as to estimate the error between an ideal control law and the actual control. These estimated error signals are utilized in the adaptation mechanism of the neural network weight vector. In the presented chaos synchronization method, the knowledge of the models of the master–slave systems is not required and the controller only needs the projective synchronization error for its implementation. Numerical simulations are performed along with a comparative study to demonstrate the efficiency and effectiveness of the suggested chaos synchronization approach.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-28T07:52:36Z
      DOI: 10.1177/10775463221101935
       
  • Dynamic calculation and optimization design of arbitrary planar branch
           piping system

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      Authors: Yin-hang Cao, Gong-min Liu, Zhi Hu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The absorbing transfer matrix method (ATMM) is applied to dynamics calculation and optimization design of planar branch piping systems combined with the response surface model or method (RSM) and a new proposed hybrid RSM (HRSM). A main path is chosen to absorb the influences of sub-branches, and the branch point transfer matrix in the main transfer path is established and proved by the ANSYS simulation and experimental results. It shows that the errors between the ATMM and the finite element method are less than 0.36% in the calculation of the natural frequencies of the two-branch piping system, and the ATMM also agrees well with the dynamics response experimental results of the cross-branch piping system. Then, based on the initial design model of a double-branch piping system, first order natural frequency analysis samples are selected for the branch point positions optimization using the uniform design method (UD) and calculated by the ATMM; the minimum value of the RSM, obtained by fitting the samples with a second-order polynomial (SOP) function, is solved as the best design scheme using the genetic algorithm (GA). Finally, for the problem of supporting positions optimization of a T-branch piping system, a HRSM using the SOP function to fit the variation law with different supporting positions in the samples of the dynamics response optimization target, which is the total x-directional vibration acceleration level (TAC) of three supporting points in the frequency 1–300 Hz and the Fourier basis function to fit the relationship of SOP function error with independent variables is proposed combining the Minimize Prediction (MP) adding point criterion to gradually update the samples, until the HRSM reaches stability and obtains the wanted design solution.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-28T05:29:21Z
      DOI: 10.1177/10775463221103095
       
  • A blending control for broadband vibration isolation considering
           zero-infinite stiffness and damping

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      Authors: You Zhou, Yeying Tao, ZhengGuang Zhang, Xiaoqing Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Active vibration isolation system (AVIS) using the traditional vibration isolation technology, such as reducing suspending stiffness and adding absolute damping, has performance defects due to the residual low-frequency disturbances which still severely restrict the precision machine accuracy. This paper proposes a novel vibration control method combining inertial absolute sensor feedback (ASF) and positive relative sensor feedback (RSF), which can highly improve the low-frequency vibration isolation performance, and the blending control method is analyzed according to the vibration transmission. The results show that ASF strengthens the connection between the payload and the absolute space, while positive RSF weakens the connection between the payload and the base. By introducing ASF and positive RSF blended, the stiffness and damping between the payload and the absolute space can be increased to near infinity, while the stiffness and damping between the payload and the base can be attenuated to near zero. The blending control method includes absolute displacement feedback (ADF), positive relative displacement feedback (RDF), absolute velocity feedback (AVF), and positive relative velocity feedback (RVF). ADF combined with RDF improves the vibration isolation performance at low-frequency, while AVF combined with RVF improves the performance around the inherent frequency and high-frequency. In this way, the payload is hard to be affected by disturbances in a broad frequency region. Finally, the proposed method is verified by experiments and compared with the commonly used sky-hook damping method. It shows that the initial frequency of vibration isolation is reduced from 5.6 Hz (sky-hook damping method) to 1 Hz (the proposed method), the magnitude of vibration transmission starts with −11.1 dB (at 1 HZ), and the maximum magnitude is always below 0 dB from 1 Hz to 50 Hz.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-27T11:00:51Z
      DOI: 10.1177/10775463221100070
       
  • Elastic wave attenuation in a metaplate with periodic hollow shapes for
           vibration suppression

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      Authors: Sunao Tomita, Hidekazu Nishigaki, Ryuji Omote
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Low noise and vibrations are requirements for engineering structures to realize comfort and ensure systems are environmental friendly. Periodic structures such as phononic crystals have been investigated to suppress noise and vibrations because they inhibit elastic wave propagation in the frequency ranges referred to as the band gap. This study led to the proposal of a metaplate (MP) with periodic hollow structures to form band gaps by changing the surface shapes of the thin plates. MPs such as this can be beneficial from the viewpoints of manufacturing cost and structural reliability when applied to engineering structures. To evaluate the potential ability of the proposed MP to suppress vibrations, we obtained the band gap frequency of out-of-plane deformation waves using the wave finite element method. To efficiently evaluate the band gaps, the internal degrees of freedom in a unit cell are reduced based on the modal analysis technique. Furthermore, the out-of-plane and in-plane deformation waves are separated using kinematic energy to extract the band gap related to the out-of-plane deformation waves. Based on this numerical framework, we demonstrate that periodic hollow shapes can form a band gap in the frequency range of interest in engineering problems. Moreover, the potential of the MP was investigated using hollow shape design and material selection, and the results indicate that the proposed MP is beneficial for tuning the band gap frequency in a unit cell of which the size is acceptable for engineering structures. Finally, vibration suppression caused by band gap is experimentally demonstrated via impact testing of an MP fabricated using additive manufacturing.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-27T06:45:33Z
      DOI: 10.1177/10775463221084409
       
  • Imbalance compensation of active magnetic bearing systems using model
           predictive control based on linear parameter-varying models

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      Authors: Abdelrahman Morsi, Hossam S Abbas, Sabah M Ahmed, Abdelfatah M Mohamed
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Active magnetic bearing (AMB) is a suspension system to levitate a rotating shaft freely without any physical contact which allows extremely fast rotation speeds. One big control challenge of the AMB systems, which appears during high rotation speeds, is the non-uniform distribution of the rotor weight about its rotating axis. This is usually referred to as the rotor imbalance problem which produces sinusoidal disturbance forces. These disturbances lead to undesirable vibrations and large deviations of the rotor shaft from its desired trajectories. We adopt in this work model predictive control (MPC) to reduce the effect of these sinusoidal disturbances and to achieve a stable levitation of the rotor shaft while tracking a reference trajectory. Owing to the MPC capability of handling constraints in an optimal manner, physical input constraints can be committed. Moreover, state constraints can be imposed to ensure safety of operation. For tractable implementation, we embed the nonlinear dynamics of the system in a linear parameter-varying (LPV) representation. To guarantee stability of the closed-loop system, a terminal cost and a terminal constraint set are included in the MPC optimization problem. For tractable computations of these terminal ingredients, a reduced LPV model is considered. The performance of the proposed LPV-MPC scheme is validated via simulation on the nonlinear model of an experimental setup of an AMB system and it is compared with two other classical controllers commonly used for these AMB systems in practice.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-27T03:24:25Z
      DOI: 10.1177/10775463221099074
       
  • Decentralized robust preview control for uncertain continuous-time
           interconnected systems

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      Authors: Hao Xie, Fucheng Liao, Fangwen Ye, Manxin Sun
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates the problem of robust preview tracking control for uncertain continuous-time interconnected systems. We adopt the technology of decentralized control. The tracking controller for each uncertain isolated subsystem is first designed. With the help of an uncertain error system, the considered tracking problem is converted into a regulation problem. The preview tracking controller for the nominal system is obtained by utilizing existing results. A novel method is proposed to tackle the uncertainty in the systems. In this method, the uncertainty bound is incorporated into the cost function. As a result, the preview tracking controller of the nominal system can be treated as a robust preview controller of the uncertain isolated subsystem. Then, the controllers of the uncertain isolated subsystems are assembled as a robust preview controller of uncertain interconnected systems. Finally, an academic numerical example is presented to show the effectiveness and superiority of the proposed controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-26T10:50:22Z
      DOI: 10.1177/10775463211068896
       
  • An analytical study of the effects of a circumferentially corrugated core
           on sound transmission through double-walled cylindrical shells

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      Authors: Mohammad Kornokar, Hesamoddin Shahsavari, Kamran Daneshjou, Roohollah Talebitooti
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Corrugated structures are widely being used in industrial applications, which raises the demand for careful analysis of their behavior. To fill the gap for vibroacoustic characteristics, this paper focuses on proposing a model to investigate sound transmission through double-walled cylindrical shells with a circumferentially corrugated core. The structure is composed of outer and inner isotropic layers and a corrugated core. The outer layer is subjected to an oblige plane wave, and also a subsonic flow is traveling outside the double-walled shell. An equivalent method is applied to replace the corrugated core as axial, radial, and rotational springs with specific stiffness coefficients. The first-order shear deformation theory (FSDT) is applied to describe the behavior of isotropic shells. A considerable parametric study is established concerning both the incident wave and structural characteristics. The results show that the presence of the corrugated core improves sound transmission loss (STL) of the structure in the mass-controlled region, and it has a negative effect on STL in the coincidence-controlled region; therefore, using such a core for sound insulation depends on the desired frequency domain.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-26T08:51:01Z
      DOI: 10.1177/10775463221100089
       
  • Joint time-frequency distribution of rolling bearings with multiple faults
           on outer raceway based on asymptotic model

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      Authors: Yunlong Li, Zhinong Li, Junyong Tao, Danyang Tian, Deqiang He
      Abstract: Journal of Vibration and Control, Ahead of Print.
      At present, the majority of the research on dynamic model of rolling bearings with multiple faults is conducted on the assumption that the displacement deviation between raceway and rolling element changes instantaneously. However, the deviation should vary gradually. As a result, an asymptotic model of rolling bearings with multiple faults on outer raceway is established, considering the interaction of multiple faults. Synchroextracting transformation method is employed to describe the joint time-frequency distribution of the faulty rolling bearings. The discrepancies between the asymptotic model and the traditional model are contrasted and analyzed via simulation modeling. Simultaneously, the effects of fault number and fault interval on the joint time-frequency distribution are investigated. Finally, experiments are performed to verify the rationality of the established model. Simulation results demonstrate that the joint time-frequency distribution derived by the asymptotic model includes not only the fault characteristic frequency but also the rotating frequency. The central frequency increases in a multiple of the fault characteristic frequency as the fault number increase, as does its energy amplitude. Only when multiple faults are uniformly distributed among the interval range of rolling elements, the energy amplitude of the central frequency can reach the maximum. The energy amplitude of the rotating frequency scarcely changes as the fault interval and fault number vary.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-26T05:35:43Z
      DOI: 10.1177/10775463221103086
       
  • Fault recognition of large-size low-speed slewing bearing based on
           improved deep belief network

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      Authors: Yubin Pan, Hua Wang, Jie Chen, Rongjing Hong
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Slewing bearing is one of critical transmission in wind turbine and shield machine withstanding low-speed and heavy-load working condition. Fault recognition is crucial to their high reliability operation. Many studies have been conducted using traditional shallow networks for fault recognition. However, they suffer from inherent disadvantages, such as low learning ability under high-dimensional nonlinear features, which make them unsuitable for fault recognition of slewing bearing. To solve these shortcomings, a novel fault recognition method is proposed based on improved deep belief network (DBN) using sampling method of free energy in persistent contrastive divergence (FEPCD). A systematic methodology based on multi-domain feature extraction is proposed to describe the fault characteristic information. After that, improved DBN optimized by FEPCD is employed to capture the fault features and recognize the fault condition of slewing bearing. The application and superiority of proposed methodology are validated using a slewing bearing life-cycle test dataset. Meanwhile, a comparison is conducted between traditional sampling methods contrastive divergence (CD) and persistent contrastive divergence (PCD). The results illustrate that improved FEPCD gets better result in training sampling. Compared with other deep learning methods such as deep Boltzmann machine (DBM) and stacked auto-encoder (SAE), and shallow intelligent algorithms like back propagation (BP) neural network and support vector machine (SVM), the fault recognition accuracy of slewing bearing is improved by using the improved DBN with FEPCD.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-26T04:51:04Z
      DOI: 10.1177/10775463221085856
       
  • Adaptive fuzzy observer-based mismatched faults and disturbance design for
           singular stochastic T-S fuzzy switched systems

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      Authors: Yuqing Yan, Huaguang Zhang, Jiayue Sun, Yingchun Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper deals with the problem of observer-based mismatched faults for switched singular fuzzy systems subject to disturbances. First, in order to obtain the estimation of unmeasurable or partially measurable states, fuzzy adaptive observer is obtained, eliminating the influence of external disturbances and mismatched faults, simultaneously. Second, by constructing appropriate piecewise Lyapunov functions and average dwell time, the switched singular fuzzy stochastic system with external parameter perturbations and faults is guaranteed to be robustly stable Further, by solving the linear matrix inequalities a sufficient condition to maintain the stability of error dynamic system is presented. Finally, to illustrate the proposed method is available, numerical examples are presented.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-25T10:44:25Z
      DOI: 10.1177/10775463221076195
       
  • Ultrasonic field analysis with local interface curvature effect based on
           the multi-Gaussian beam model

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      Authors: Jiarui Lyu, Haibo Liu, Sijia Gao, Meng Lian, Te Li, Yongqing Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In ultrasonic testing, the amplitude of echoes is determined by the sound pressure along the acoustic axis. When the workpiece has a local curved surface, the ultrasonic field redistribution has a close relationship with the curvature of the incident local region, which raises questions of testing validity and accuracy. In order to develop the curvature adaptation window for a given test condition, the influence of local curved interface on the ultrasonic transmission and reflection field is analyzed quantitatively in this paper. Based on the multi-Gaussian beam model, the distribution of transmitted and reflected sound pressure in the local curved region is calculated by using matrix transformation technique. Furthermore, the relationship between interface curvature and sound pressure along the acoustic axis is obtained. To validate the accuracy of proposed calculation model, developed relationship has been compared against a finite element method computed using COMSOL Multiphysics. It is indicated that the proposed calculation model is more efficient and the regular changes of sound pressure are basically consistent with that of finite element method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-23T03:50:42Z
      DOI: 10.1177/10775463221102210
       
  • On the impact process and stress field of functionally graded graphene
           reinforced composite pipes with a viscoelastic interlayer

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      Authors: Lizhi Li, Lu Nie, Yiru Ren, Qiduo Jin
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In the paper, impact process of the fluid-conveying pipes composed of graphene-reinforced composite layers and a viscoelastic interlayer is studied. The bending stress field, midspan displacement and contact force are focused on. Based on the theory of high-order displacement field, the governing equations are derived through the Hamilton variational principle. To obtain the approximate solution for the impact dynamics of pipes, the Galerkin method is extended to expand the generalized displacements into the schemes of triangular series. Further, by utilizing the orthogonality of the trigonometric series, the differential equations of various orders for impact dynamics are established. The fourth-order Runge–Kutta method is introduced to the truncated solutions. Subsequently, the parameter sensitivity of the transient responses in the impact stage is emphatically discussed. It is revealed that the insensitive parameters to contact force and midspan displacement have a great influence on the stress field. Furthermore, the evolution characteristics of the bending normal stress field are highlighted. Numerical results illustrate that the attenuation characteristics of bending stress field are determined by the coupling effects of internal flow and structural features on structural stiffness and damping.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-22T03:02:13Z
      DOI: 10.1177/10775463221095297
       
  • Parameter-dependent robust anti-saturation control of supercavitating
           vehicle with time-delay characteristics

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      Authors: Hao Guo, Yuntao Han, Tao Bai, Yuanzhi Zhou, Xu Tai
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Aiming at the time-delay characteristics and nonlinear planing force of supercavitating vehicles in the process of motion, a parameter-dependent robust controller with anti-saturation compensator is proposed. First, the system model with nonlinear planing force is transformed into a parameter dependent linear-parameter-varying model containing time-delay part and non-time-delay part. Then consider the external disturbance input to design a robust controller and use convex polyhedron theory and the parameter dependence characteristics of controller to ensure the stability of the system with cavitation radius perturbation. Finally, the anti-saturation compensation method is used to overcome the input constraints caused by the physical limitations of the control mechanism. The simulation results show that the controller has good control effect and robust performance for supercavitating vehicles with time-delay characteristics.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-22T02:23:37Z
      DOI: 10.1177/10775463221094886
       
  • Crack identification of functionally graded beam using distributed
           piezoelectric sensor

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      Authors: Nguyen Tien Khiem, Tran Thanh Hai, Luu Quynh Huong
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The present paper addresses development of a procedure for crack detection in functionally graded Timoshenko beam using a distributed piezoelectric sensor. Crack is represented by a pair of translational and rotational springs of stiffness calculated from its depth. A piezoelectric layer bonded to the beam is employed as a distributed sensor. Adopting the double beam model for the beam with the sensor, governing equations are conducted and utilized for establishing a database to propose a procedure for detecting a single crack in a functionally graded beam using the sensor output charge. The modal sensor charge provides a novel indicator more efficient for crack identification in functionally graded beams than natural frequencies. The effect of measurement noise, sensor thickness, and material parameters on crack identification has been investigated for beams with different boundary conditions.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-21T12:07:50Z
      DOI: 10.1177/10775463221095649
       
  • Time-delay control of quadrotor unmanned aerial vehicles: a
           multiplicity-induced-dominancy-based approach

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      Authors: José J Castillo-Zamora, Islam Boussaada, Amina Benarab, Juan Escareno
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The current work exploits the effects of time-delays on the stability of unmanned aerial vehicles s). In this regard, the main contribution is a symbolic/numeric application of the multiplicity-induced-dominancy property in the control of unmanned aerial vehicles rotorcrafts featuring time-delays. The multiplicity-induced-dominancy property is considered to address two of the most representative aerial robotic platforms: a classical quadrotor vehicle and a quadrotor vehicle endowed with tilting rotors. The aforementioned property leads to an effective delayed feedback control design (multiplicity-induced-dominancy tuning criteria), allowing the system to meet prescribed behavior conditions based on the placement of the rightmost root of the corresponding closed-loop characteristic function/quasipolynomial. Lastly, the results of detailed numerical simulations, including the linear and non-linear dynamics of the vehicle, are presented and discussed to validate the proposal.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-21T08:43:58Z
      DOI: 10.1177/10775463221082718
       
  • Direct search-based optimal robust observer for polytopic systems using
           the concept of inverse system

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      Authors: Nahid Abbasi, Maryam Dehghani, Mohammad Hasan Asemani, Roozbeh Abolpour, Mohsen Mohammadi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a novel approach is presented to design an optimal robust observer for polytopic systems using the direct searching method and the concept of inverse systems. First, a Luenberger observer is considered for a sample polytopic system. By applying the direct searching algorithm, the sub-regions of the observer design space that can make the estimation error dynamics asymptotically stable is determined. Then, by applying the Bounded Real Lemma for the inverse system of estimation error dynamics, the optimal [math] gain of the observer is found. The simulation results are presented to prove the effectiveness of the proposed algorithm. The proposed approach is applied to a simulated model of a tramway system and the results are satisfactory.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-21T06:02:21Z
      DOI: 10.1177/10775463221084397
       
  • Effects of core structure on the performance of Terfenol-D rod

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      Authors: Qiang Liu, Xiping He
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To improve the vibration performance of the Terfenol-D rod and make its work more efficient, six types of Terfenol-D rods were studied in this paper. The dynamic simulation analyses of the rods were carried out, and the core loss of the rods were calculated and analyzed. Three structures of rods were manufactured, and their output amplitude were tested. The results showed that an untreated rod had the highest resonance frequency, the largest mechanical quality factor, and the smallest output amplitude and outer surface stress; compared with the untreated rod, the resonant frequency and mechanical quality factor of the sliced and slit rods reduced, the output amplitude and outer surface stress of the sliced and slit rods increased; the resonant frequency and mechanical quality factor of the sliced rods were smaller than those of the slit rods; and the output amplitude and outer surface stress of the sliced rods were larger than those of the slit rods. The untreated rod had the largest core loss on the outer diameter surface; the core loss on the outer diameter surface of the sliced and slit rods reduced, and the core loss of sliced rods was less than that of slit rods. The radially slit rod had the largest overall core loss; the overall core loss of the radially cut and bonded rod and the sliced rods was less than that of the untreated rod and the radially slit rod.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-21T04:14:46Z
      DOI: 10.1177/10775463221102668
       
  • Finite-time convergence of perturbed nonlinear systems using adaptive
           barrier-function nonsingular sliding mode control with experimental
           validation

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      Authors: Omid Mofid, Saeed Amirkhani, Sami ud Din, Saleh Mobayen, Mai The Vu, Wudhichai Assawinchaichote
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, an adaptive barrier procedure is combined with nonsingular sliding mode control (SMC) technique at the aim of the fast stabilization of nonlinear system with external disturbances. It is verified that the barred function-based control law leads to the fast convergence of state errors to a region near origin. Furthermore, the suggested method eradicates the requirement for the knowledge of upper bounds of exterior perturbations which are frequently required in SMC scheme. The stability analysis confirms fast convergence of the error states to a predetermined region. In order to demonstrate the validity of the planned method, a mass-spring system is examined as the case study. Finally, simulation and experimental outcomes on a mass-spring system are given to prove the efficacy and success of the advised methodology.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-21T04:08:46Z
      DOI: 10.1177/10775463221094889
       
  • Low-frequency vibration control of two flexible appendages using a joint
           with actively tunable stiffness

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      Authors: Wei Hu, Jianming Wu, Qinghua Zhu, Xunjiang Zheng, Shaoyong Sun, Yucong Tang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Low-frequency and large-amplitude vibration of flexible appendages in space can be induced when a spacecraft performs attitude maneuvers and thermal alternations during orbit operation. In this paper, a novel joint mechanism combined with a semi-active method for variable stiffness control is proposed to suppress the low-frequency vibrations of flexible jointed appendages. The variable stiffness of the joint is derived from the linear relationship between its output torque and rotation angle when direct current (DC) power is applied to the coils. Based on the Lagrange equation and the assumed mode method, the coupling dynamic relationships of the active joint and two flexible appendages are established, and semi-active vibration control simulations are performed. A ground experimental platform is built to simulate the microgravity environment in space. The frequency shift effect of rigid body motion and elastic vibration under impact disturbance are investigated. In addition, the effect of variable stiffness control on the elastic deformation of flexible appendages is studied. The simulation and experimental results indicated that the proposed method can control both the rigid body motion of the system and the elastic vibration of the appendages. It has been found that the major frequency bandwidth of the interference signal is within 0.3–1.0 Hz with a substantial vibration attenuation of 1.82–16.62 dB for the joint and 4.86–11.48 dB for the flexible appendages.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-20T09:28:33Z
      DOI: 10.1177/10775463221100871
       
  • A novel six-dimensional disturbance force and moment simulator for
           simulation of space micro-vibration environment

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      Authors: Xiaoming Wang, Shuai He, Zhenbang Xu, Hang Li, Huayang Sai, Jianfeng Yang, Lin Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A novel six-dimensional disturbance force and moment simulator was developed because of the lack of a suitable vibration source for use in ground experiments. First, the dynamic relationship between the disturbance force, the disturbance moment generated at the center of the simulator platform, and the excitation forces of the six uniaxial actuators was established using the equivalent principle of force system. Then, the simulator structure was introduced and a modal analysis of this structure was performed. Finally, the simulator system was tested experimentally in both single-frequency experiments and multi-frequency experiments. The results obtained showed that the maximum error between the experimental values and the target values was 2.96%, which verified the correctness of the theoretical model of the six-dimensional disturbance force and moment simulator. Additionally, the multi-dimensional micro-vibration generation performance of the new simulator was verified. The proposed six-dimensional disturbance force and moment simulator can provide a micro-vibration environment to replace the real disturbance sources used in ground experiments and solve the problems caused by the lack of a vibration source for use in ground-based experiments.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-20T02:58:09Z
      DOI: 10.1177/10775463221101943
       
  • Structural optimization of vertical isolated rocking core-moment frames

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      Authors: Navid Rahgozar, Majid Pouraminian, Nima Rahgozar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Dual earthquake-resistant archetypes suffer residual damage following a severe earthquake leading to socio-economic drawbacks. A vertical isolated rocking core-moment frame (VI-RCMF) provides a resilience technique to curtail the seismic vulnerability using the isolation of subsystems. Viscous dampers, installed at each floor level of the VI-RCMF archetype, separate moment frame (MF) from rocking-core (RC). The self-centering RC performs as a passive strong-back core, which can uplift on its toes. Although the VI-RCMFs have exhibited superior performance compared to non-isolated dual frames, there are analytical challenges to come up with the optimal design due to the complex interaction of subsystems. This paper presents an optimization framework for quantifying the optimal design parameters of VI-RCMFs. Accordingly, the simultaneous perturbation stochastic approximation (SPSA) method is employed as the optimization algorithm. The objective function is defined to minimize the displacement of MF and the design vector includes mass, stiffness, and damping ratios. The SPSA optimization analyses are conducted for a set of archetypes using OpenSees software. Optimal normalized responses of subsystems are computed for 44 far-field ground motions and aleatory uncertainties are quantified for optimal design variables. The results demonstrate the effectiveness of the proposed procedure for optimizing VI-RCMFs. The derived optimal design vector can be used for the preliminary design of low-to mid-rise archetypes.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-19T09:51:18Z
      DOI: 10.1177/10775463221096882
       
  • Calculation of the dynamic responses of a railway track on a non-uniform
           foundation

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      Authors: Le-Hung Tran, Tien Hoang, Gilles Foret, Denis Duhamel
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The dynamic response of a railway track has been investigated by analytical or numerical models. When rail supports (sleepers) or foundation contain defects, the damage reduces stiffness and the track becomes non-uniform. This paper presents a new analytical model to calculate the dynamic responses of a railway track on a non-uniform foundation. In this model, the rail is considered as an infinite beam resting on equidistant supports and subjected to moving forces. The sleepers responses are stable provided that there is a sufficiently large distance between the applied forces and the defective area. By combining this condition and the dynamic equation of the beam, we can deduce a relation between the reaction forces in the supports and the displacement of the beam. This relation does not depend on supports and foundation behaviors. Hence, we can calculate the dynamic response of the track by using the constitutive laws of the supports. The responses can be obtained finally with direct or with iterative techniques. The numerical examples show that a defective zone causes an increase in the rail displacement at the defective zone and overloads the neighbor supports.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-19T04:11:56Z
      DOI: 10.1177/10775463221099353
       
  • Coupled bending torsional vibrations of viscoelastic rotors with
           fractional damper

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      Authors: Zahra Bayat, Hassan Haddadpour, Zahra Zamani
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The behavior of a Jeffcott rotor with lateral-torsional coupling is investigated in the presence of internal and external damping and eccentricity. The governing equations are derived based on the Lagrange method. Also, the Laplace method and linearization is used to solve the governing equations for free vibrations analysis. For a rotor with unbalance, the instability occurs when the real part of eigenvalues has positive values, and at the same time, it is the intersection point between the lines of natural frequencies. The instability speed increases with increasing the external damping, yet dependent on the internal damping and unbalance. Also, it is demonstrated that the rotor critical speed is affected by the order of fractional derivatives.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-19T03:58:34Z
      DOI: 10.1177/10775463211072404
       
  • Passivity-based hierarchical sliding mode control/observer of
           underactuated mechanical systems

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      Authors: Mohammad-Reza Moghanni-Bavil-Olyaei, Jafar Keighobadi, Ahmad Ghanbari, Angelina Olegovna Zekiy
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates a passivity-based hierarchical SM control (PBHSMC) approach to solve the trajectory tracking issue of a special class of UMSs using unmeasured states and in presence of both unmatched and matched perturbations. First, a passivity-based SM observer (PBSMO) is designed for quick estimation of states in the UMS. Then, we develop a nonlinear two-layer switching surface using feedback passivation. The passivation-based approach ensures global asymptotical convergence of tracking error on the switching surface with the discontinuous term. Moreover, we develop an SMC law that can satisfy reaching mode and sliding mode conditions. Finally, to illustrate the performance of theoretical results, the developed control scheme is assessed by numerical simulation of two case studies including flexible-joint manipulator (FJM) and underactuated surface vessel (USV) systems. The simulation results indicate the superiority of the PBSMO-based PBHSMC scheme over the conventional SMO-based HSMC in suppressing unwanted oscillations of link, low tracking error and overshoot, short settling time, smooth and small control efforts, and also more accurate estimation of state variables with less chattering.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-19T02:26:26Z
      DOI: 10.1177/10775463221091035
       
  • Feasibility study of single-mass flywheels with centrifugal pendulum
           vibration absorbers in vehicles with dual-clutch transmissions

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      Authors: Yi Zhou, Xiaohui Shi, Wenyi Rao, Dong Guo, Ziyuan Mei
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Dual-clutch transmissions (DCTs) are very sensitive to torsional vibration and easily produce rattle noise if a single-mass flywheel (SMF) with a conventional torsional damper or a dual-mass flywheel (DMFW) is used in the vehicle. Only a DMFW combined with a centrifugal pendulum vibration absorber (CPVA) can eliminate rattle problem; however, this solution is expensive. Alternatively, a SMF with a CPVA is proposed to eliminate the DCT rattle issue, which could be a feasible and cost-effective solution free of side effects introduced by DMFWs. The vibration absorption principle of different types of pendulums and the rotor dynamic model are investigated to study the feasibility of a SMF with CPVA in a DCT vehicle. A seven-degree-of-freedom nonlinear lumped torsional vibration model is proposed to evaluate the torsional vibration attenuation performance of different configurations of torsional dampers and CPVAs. As per the model calculation results, the bifilar pendulum features the best attenuation performance compared with the circular and cycloid pendulums. The effect of pendulum parameters on attenuation is studied, and the optimized values are obtained. The SMF and optimized bifilar CPVA combination can satisfy the no-rattle requirements in vehicle relative to the DCT in-vehicle no-rattle threshold. A vehicle assessment on roads using physical pendulum prototypes indicates that the SMF with CPVA can be used as an alternative, cost-effective solution for DCTs, instead of the expensive DMFW with CPVA solution.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T10:45:45Z
      DOI: 10.1177/10775463221093106
       
  • Using a continuous mathematical model to investigate the effect of a
           symmetric circumferential crack on the free vibrations of a simply
           supported Euler–Bernoulli beam

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      Authors: Saleh Jomezade Khazarbeygi, Seyed Majid Yadavar Nikravesh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates the influence of a circumferential crack on a simply supported beam’s free vibration behavior analytically and numerically. The beam is modeled by Euler–Bernoulli beam theory with a circular cross-section. The circumferential crack is modeled by considering a continuous effect in the displacement field. An exponential function is considered in the displacement field with an exponential decay rate parameter which characterizes the influence of crack on its surroundings. The exponential function of crack depth ratio was proposed for the exponential decay rate of symmetric circumferential open cracks using a comparative method based on finite element simulation for the first time. The equation of motion is derived using Hamilton’s principle and solved by a Galerkin method, and natural frequencies are obtained. The crack depth and position influence on the natural frequency are analytically clarified and compared with a symmetric and single-edge crack. The possibility of identifying the location and relative depth of the crack has been investigated. Whatever the crack is, closer to the maximum amplitude vibration in each mode, the frequency ratio is more dropped, making it more detectible. Also, the circumferential crack is more affected on vibration behavior than the symmetric and single-edge crack. The analytical results have excellent conformity with the finite element results obtained by the ABAQUS 3-dimensional model. Also, some experimental results have been obtained to validate the finite element model. The finite element model has an excellent agreement with experimental results. The results can be used to identify circumferential cracks.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T05:06:36Z
      DOI: 10.1177/10775463221092835
       
  • Vibration reduction of footbridges subjected to walking, running, and
           jumping pedestrian

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      Authors: Hamed Saber, Farhad S Samani, Francesco Pellicano
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the performance of vibration absorbers in reducing the vertical deflections of the footbridges subjected to human activities is studied. The vertical component of the pedestrian force during walking, running, and jumping is simulated as a moving time-dependent force model. The optimal parameters for the attached vibration absorbers are defined to minimize the deflection of the footbridge. The effectiveness of each vibration absorber is reviewed for different types of excitations. Results show reductions of 91%, 95%, and 96% in terms of the amplitude of vibration for the footbridge with the optimized tuned mass damper subjected to walking, running, and jumping, respectively, in comparison with a bare footbridge. The performance of the tuned mass dampers optimized numerically in the present study is compared with the tuned mass dampers possessing parameters achieved analytically. The damped footbridge with the numerically optimized tuned mass damper under walking, running, and jumping pedestrian experienced a deflection reduction of 9%, 34%, and 37%, respectively, concerning the tuned mass damperwith analytical parameters.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T04:44:35Z
      DOI: 10.1177/10775463221093107
       
  • Weak fault feature extraction using adaptive chirp mode decomposition with
           sparsity index regrouping scheme and time-delayed feedback stochastic
           resonance

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      Authors: XiaoDong Zhang, HongChao Wang, WenLiao Du
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The failure features of rolling bearings are often weak due to the influence of strong background noise. In addition, the vibration signals of faulty rolling bearing often show nonlinear and non-stationary characteristics, and the conventional time-frequency method is no longer suitable for extracting effective fault features. In order to extract the early weak fault characteristics of rolling bearing accurately, a weak fault feature extraction method for rolling bearing by combining adaptive chirp mode decomposition (ACMD) based on sparsity index regrouping scheme with time-delayed feedback stochastic resonance (TDSR) is proposed in the paper. The proposed method comprehensively utilizes the adaptive decomposition characteristics of ACMD for multi-component non-stationary signals and the enhancement effect of TDFSR on low-frequency signals in the fast Fourier transform (FFT) result. Firstly, ACMD is used to decompose the early weak fault signal of rolling bearing into a series of mode signals, then the proposed signal regrouping scheme based on sparsity index is utilized to regroup the obtained series of modes. Secondly, the optimal reconstructed component containing the main fault information is input into the calculation model of TDSR. Finally, FFT is performed on the output signal of TDSR to extract the fault characteristics effectively.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T04:43:40Z
      DOI: 10.1177/10775463221100872
       
  • Nonlinear forced vibrations of a slightly curved pipe conveying
           supercritical fluid

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      Authors: Si-Qin Ye, Hu Ding, Sha Wei, Jin-Chen Ji, Li-Qun Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Vibrations of pipes caused by axially flowing fluids are very common in engineering applications. Due to material imperfections, guide misalignment, and improper supports, the installed pipes are prone to the initial curvature. Though small, the initial curvature can significantly change the dynamic characteristics of the slightly curved pipe system. This study investigates the non-linear forced vibration of a slightly curved pipe conveying supercritical fluid around the curved equilibrium, with the emphasis on amplitude–frequency responses around two asymmetric non-trivial equilibrium configurations. The governing equations for the forced vibration of a slightly curved pipe conveying supercritical fluids are derived using the generalized Hamilton principle. Then, the equations of motion are discretized into a set of coupled ordinary differential equations via the Galerkin truncation method and solved by the harmonic balance method combined with the pseudo-arc length technique. The approximate analytical results are verified by the numerical integration results. The obtained results demonstrate that the initial curvature has a significant effect on the dynamic characteristics of pipes conveying supercritical fluids, and can lead to significant differences in the dynamic response of the pipe system near different equilibrium configurations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T04:32:01Z
      DOI: 10.1177/10775463221102074
       
  • Active vibration control of flexible thin-walled beam using multi-layer
           planar dielectric elastomer actuator

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      Authors: Qing Xue, Chong Liu, Shilin Xie, Yahong Zhang, Yajun Luo
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The paper investigates the active vibration control (AVC) of flexible thin-walled structure using dielectric elastomer (DE) actuator. It is proposed to bond directly DE film to the surface of flexible thin-walled structure so as to actively control structural vibration through in-plane actuation of DE film. This kind of actuator is referred to as planar DE actuator, which has advantages such as small additional mass and easy installation, and thereby can realize more easily active vibration control of flexible thin-walled structures in comparison with DE actuators with columnar configuration. In order to reduce control voltage, a multi-layer planar DE actuator (MPDEA) is further developed. Based on the Hamilton principle and the constitutive equation of DE material, the governing equation in the form of finite element for a cantilever polycarbonate beam with MPDEA is derived. Simulated and experimental studies are carried out on active vibration control of flexible thin-walled beam using MPDEA with different layers. The results show that MPDEA can achieve good vibration control effect for flexible thin-walled beam. Especially, the driving voltage can be greatly reduced by employing MPDEA. Moreover, a nonlinear compensation model is proposed to suppress the control spillover caused by nonlinear actuating properties of MPDEA. The simulated and experimental results of AVC of cantilever flexible thin-walled beam with the compensation model show that the overall control performance can be improved due to noticeable restrain of the control spillover.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-17T01:48:41Z
      DOI: 10.1177/10775463221088653
       
  • Kaimal spectrum based H2 optimization of tuned mass dampers for wind
           turbines

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      Authors: Somya Ranjan Patro, Arnab Banerjee, Sondipon Adhikari, G. V. Ramana
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The closed-form analytical expression of the objective function of a single degree of freedom system with the tuned mass damper, subjected to Gaussian white noise and Kaimal forcing spectrum, is derived implementing the H2 optimization technique. To illustrate the procedure, a wind turbine tower with and without the tuned mass damper, subjected to wind load, has been presented. The Kaimal spectrum has been considered to model the effects of wind load. Usually, the parameters of the tuned mass damper is optimized by implementing the H2 optimization technique on Gaussian white noise even though the system is subject to any other forcing spectrum. Obtaining an analytical closed-form expression of the objective function for a tuned mass damper system considering a real spectrum is very challenging as a real spectrum may contain fractional order of the frequency. Therefore, either objective function can be obtained numerically or an analytical form can be obtained but only for Gaussian white noise as an input forcing spectrum. To address the above-mentioned issue, in this paper, the concept of near identity spectrum is introduced to idealize the Kaimal spectrum with high accuracy from which a closed-form expression of the objective function can be established. Further, histogram plots of the response reduction have been made to show a comparison between the tuned mass damper system optimized with Gaussian white noise and the Kaimal spectrum. The results showed that the displacement response of the tuned mass damper system subjected to the Kaimal spectrum yields better performance if it is optimized according to the Kaimal spectrum rather than Gaussian white noise and vice versa.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-16T10:12:36Z
      DOI: 10.1177/10775463221092838
       
  • A robust and fast active fault tolerant control for quadrotor applications
           with actuator fault’s unknown statistical characteristics

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      Authors: Omid Rezaei, Ali Rahdan, Masoud Dahmardeh, Arian Yousefiankalareh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Fault tolerant control (FTC) methods considering known faults for quadrotor applications are presented; however, unknown statistical faults characteristics particularly for the FTC design is not discussed. This study tackles this problem and presents a robust two-stage unscented Kalman filter (RTSUKF) that is robust against unknown faults and is able to accurately estimate multi-actuator faults with unknown statistical characteristics. The estimated unknown faults are then compensated through second-order sliding mode controllers which are designed for each of the translational and rotational movements. The fast convergence speed of the proposed estimator reduces the instability time interval of the quadrotor after fault occurrence. To discuss the reliability of the proposed method, stability analysis based on the Lyapunov theory is carried out for the whole closed-loop system. Finally, the robustness of the proposed FTC structure against unknown faults with its convergence speed are validated through numerical analysis. The results confirm the effective and good performance of the proposed method compared to another FTC with a conventional two-stage unscented Kalman filter.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-16T01:01:58Z
      DOI: 10.1177/10775463221100062
       
  • An excellent harmonic feedforward-sliding mode output feedback hybrid
           algorithm for helicopter active vibration control

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      Authors: Kai Lang, Lina Shang, Pinqi Xia, Laishou Song
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Higher harmonic control algorithms in frequency domain are generally used for active vibration control of helicopter fuselage. However, these algorithms are inefficient to control transient vibration caused by rapid changing of helicopter flight conditions. Time domain feedback algorithms are efficient to control the transient vibration. In this paper, an excellent harmonic feedforward-sliding mode output feedback hybrid algorithm by combining frequency and time domain algorithms is presented to improve the effect and performance of active vibration control of helicopter fuselage, meanwhile to avoid the requirement of full state information of control system due to using the time domain algorithms. The convergence criterions of the harmonic feedforward algorithm and the hybrid algorithm are theoretically derived, respectively. The convergence speed of the hybrid algorithm is theoretically proved to be faster than that of the harmonic feedforward algorithm. Active vibration control simulation and experiment on a dynamically similar and geometrically scaled frame structure of a helicopter fuselage verify the proposed hybrid algorithm with excellent control effect and performance.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-15T12:13:46Z
      DOI: 10.1177/10775463221099350
       
  • Free vibration analysis of laminated cylindrical adhesive joints with
           conical composite shell adherends

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      Authors: Mohammad Meskini, Ahmad Reza Ghasemi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Free vibration analysis of adhesive joins between two laminates circular cylindrical along with conical laminated composite shells considering various boundary conditions are examined. The numerical analysis are studied based on the first order shear deformation shell theory (FSDT) and considering compatibility conditions. Using Hamilton principle method, the governing equations of composite cylindrical shell lap adhesive joined to the composite conical shells are obtained. The analysis for carbon/epoxy, glass/epoxy and aramid/epoxy laminated composite materials and various type of adhesive materials are studied. For solving the equilibrium equations of lap joined the cylindrical to the conical shells with adhesive layer, the generalized differential quadrature method (GDQM) is used. The effect of circumferential wave number, length to radius ratio of the shell, length of overlap to length of shell ratio, thickness to radius ratio and thickness of adhesive to thickness of shell ratio are investigated. Furthermore, the various cone angles of conical shell, type of materials and adhesive layer on the natural frequency of laminated circular cylindrical connected to the conical shells are studied. In order to validate the numerical results of present analysis with previous research compared that the result shown that these comparisons show very good agreement. Numerical results shown that with increasing the value of cone angle of the conical shell and the ratio of overlap length to shell length, due to increasing the structural stiffness, the non-dimensional frequency of the structure with adhesive layer increased.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-15T11:00:50Z
      DOI: 10.1177/10775463221097466
       
  • A combined sound field reconstruction method for non-cylindrical rotative
           surfaces based on statistically optimal cylindrical near-field acoustic
           holography and multipoint Helmholtz equation least square

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      Authors: Wei Cheng, Peng Zhang, Chao Song, Xuefeng Chen, Kai Ou, Shengming Han, Jinglei Ni, Zelin Nie, Yilong Liu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      For the sound field reconstruction of non-cylindrical rotative surfaces, current near-field acoustic holography (NAH) methods have relatively poor applicability and low accuracy. To overcome the problem, a combined sound field reconstruction method is proposed. First, an improved multipoint Helmholtz equation least square (HELS) method is proposed, which is more applicable to reconstruct the sound field with an aspect ratio larger than 1. Second, based on single criterion traversing method (SCTM), an improved double criterion traversing method (DCTM) is proposed to determine the optimal truncation order, and reduce the reconstruction error of multipoint HELS. Third, with the sound pressure measured on the holographic surface, the sound pressure on the transitional surface is reconstructed using statistically optimal cylindrical near-field acoustic holography (SOCNAH), and the sound pressure on the reconstruction surface is reconstructed using multipoint HELS. Finally, typical numerical case studies and experimental studies on a test bed are carried out, which validate that the combined method can obviously improve the accuracy and robustness of sound field reconstruction for non-cylindrical rotative surfaces, and thus provide reliable evidences for noise monitoring and control of mechanical systems.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-15T10:56:44Z
      DOI: 10.1177/10775463221094885
       
  • Multi-body modelling and ride comfort analysis of a seated occupant under
           whole-body vibration

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      Authors: Veeresalingam Guruguntla, Mohit Lal
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Seated occupants of any on/off-road vehicle are continuously exposed to undue low-frequency mechanical whole-body vibration (WBV) owing to the vibration conveyed from seat and backrest because occupants need to compromise with comfort and safety, leading to several musculoskeletal disorders and injuries in the body. Pain in the lumbar region is one of the most common problems that develop because of force transmitted from the backrest. Thus, consideration of backrest is highly essential while developing a biomechanical model for ride comfort analysis. For this purpose, a 20 degrees-of-freedom (dofs) biomechanical model has been proposed with a backrest to analyse cross-coupled segmental transmissibility. The interconnection between different segments of mass and backrest are modelled using eight linearized (direct as well as cross-coupled) stiffness and damping parameters. Biomechanical model parameters are estimated and optimized through a multi-objective firefly algorithm by minimizing the sum of squares error difference between analytical results and experimental segmental transmissibility published in the literature. Subsequently, ride comfort analysis is performed by integrating the proposed model with 7-dofs passenger car model. For different body segments, simulated results are obtained in terms of vertical accelerations and compared with ride comfort standards as per ISO 2631-1:1997. Additionally, a sensitivity analysis (±20% variation in mass, stiffness and damping) is performed to enhance the ride comfort of the occupant. The findings suggest that designers must focus on the pelvis, lower and upper back regions to improve the ride comfort of the occupants. The concepts and ideas outlined in this article are directly applicable in making human dummies, car suspension and seat design in the industry.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-14T08:24:27Z
      DOI: 10.1177/10775463221091089
       
  • A disturbance-compensation-based sliding mode control scheme on mode
           switching condition for hybrid electric vehicles considering nonlinear
           backlash and stiffness

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      Authors: Ziwei Zhou, Rong Guo, Xiaoyue Liu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, a coordinated control problem of power sources and actuators of a series-parallel hybrid electric vehicle on mode switching condition is addressed. There exist numerous nonlinear factors in the hybrid driveline system which induce system disturbance and will deteriorate the control performance on mode switching condition. However, coupled system nonlinearity is not taken into consideration for controller design on mode switching condition, which can lead to severe driveline oscillation and thus vehicle longitudinal jerk. For this reason, a disturbance observer and compensation method is introduced to resolve the control problem on mode switching condition. First, an analytic model of driveline torsional vibration considering disturbance brought by system nonlinearity is established and simplified for controller design. Based on the simplified model, a disturbance observer-sliding mode control strategy is proposed to suppress mode switching vibration. Numerical simulation is carried out to validate control performance of the DOB-SMC strategy. Simulation results demonstrate that DOB-SMC strategy has better ability to cancel the unwanted effects of disturbance brought by system nonlinearity compared with sliding mode control method, which can be regarded as an effective approach to attenuate vehicle longitudinal jerk and thus improve ride comfort on mode switching condition.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-14T02:43:44Z
      DOI: 10.1177/10775463221096195
       
  • A semi-analytical method for free vibration of semi-closed shells of
           revolution with variable curvature

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      Authors: Yong-Sheng Lian, Xue Li, Jun-Yi Sun, Xiao-Ting He, Zhou-Lian Zheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study is concerned with the free vibration analysis of semi-closed shells of revolution with variable curvature, with a focus on the analytical solution to the natural frequency of such shells. A semi-closed shell of revolution with variable curvature is firstly divided into some narrow small shell segments, then the first small shell segment with a closed shell apex is approximated with a semi-closed conical shell, while the remaining small shell segments are approximated with a series of progressively larger truncated conical shells. Since each small conical shell is part of the large semi-closed shell of revolution with variable curvature and has to vibrate in sync with the large shell, the analytical solution to the axisymmetric free vibration of the large shell can be transformed into the analytical solutions to the synchronous free vibration of these small conical shells. The general solutions for the natural frequencies of all small conical shells are analytically derived under the condition that conical shells have zero meridional curvature. The undetermined constants in the general solutions are determined by letting all natural frequencies of these small conical shells be equal. Finally, the analytical solution for the axisymmetric free vibration of semi-closed shells of revolution with variable curvature is presented and is proved to be basically reliable by conducting a confirmatory experiment based on polymer 3D-printing technique.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-13T08:34:47Z
      DOI: 10.1177/10775463221075440
       
  • Vibration analysis of a deep groove ball bearing with localized and
           distributed faults subject to waviness based on an improved model under
           time-varying speed condition

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      Authors: Xiaohan Cheng, Aiming Wang, Hui Yang, Tao Zhang, Congjie Cao, Guangqiang Wu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a six-degree-of-freedom (6-DOF) comprehensive dynamic model of bearing-pedestal having waviness on its inner race and different sized surface damages has been presented to investigate the vibration response under time-varying speed conditions. It can provide a good solution to further analyze rotor systems with unfixed or elastic-supported pedestals, where vibrations in both horizontal and vertical directions are crucial. A signal processing method for fault feature extraction and enhancement of rolling element bearing in varying speed conditions is proposed. Vibration patterns with different raceway waviness and different sized surface damages are specifically studied. Characteristic frequencies are observed, which can be used for diagnosis of different sized waviness and faults under time-varying speed process. The present study will provide new insights into dynamic behavior of bearing system,
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-13T08:11:13Z
      DOI: 10.1177/10775463221094162
       
  • Magnetic ring array with high-amplitude negative stiffness for high
           performance micro-vibration isolation

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      Authors: Yamin Zhao, Junning Cui, Limin Zou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A magnetic ring array (MRA) with high-amplitude negative stiffness is proposed to counteract the positive stiffness of vibration isolators and improve the low-frequency performance of heavy-load precision micro-vibration isolation. The MRA uses magnetic rings mounted coaxially and magnetized perpendicularly to form an array structure that produces high-amplitude negative stiffness. An analytical model of its magnetic force and stiffness is established, and the influence of geometric parameters on stiffness is analyzed for optimization. Furthermore, the effectiveness of the MRA is validated through comparisons with existing schemes. A set of experiments are carried out to prove the validity of the analytical model and the performance of the MRA. Experimental results show that the natural frequency of the vibration isolation experimental setup decreases from 4.75 Hz to 1.13 Hz after the introduction of the MRA, and the peak of the one-third octave band velocity spectra decreases from 5.03 μm/s @ 5 Hz to 2.60 μm/s @ 1.25 Hz. The effectiveness of the proposed MRA in improving the performance of micro-vibration isolation is verified.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-13T07:36:10Z
      DOI: 10.1177/10775463221083178
       
  • 3D dynamic modelling of a rigid manipulator mounted on a rectangular plate
           based on Hamilton principle

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      Authors: Xiaobin Tang, Zhijiang Xie, Jiahao Zhu, Jian Zhang, Lingbin Zeng, Yangjun Pi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper proposes a comprehensive model to predict the dynamical coupling behaviors of a rotating rigid manipulator mounted on a rectangular plate, which represents real applications such as on-orbit array installation of solar panels. The three-dimensional relationship of displacement field between the end-effector, with arbitrary installation position and azimuth, and the rectangular plate is first established based on spatial descriptions and transformations method. Galerkin’s method is employed and extended to treat the spatial partial derivatives. Then, the governing equation of motion is derived using the Hamilton principle. The dynamic behavior of the system with respect to torque input, the variation of structural parameters as well as installation position and azimuth of the manipulator, is analyzed by simulation, which may provide some principles to control the vibration amplitude of plate and oscillating value of end-effector. Simulation results show that the presented three-dimensional dynamic model is more proper and accurate to describe the dynamic behaviors of system through comparison with two conventional dynamic models, and especially the large structure parameter manipulator is mounted on a rectangular plate.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-13T07:26:06Z
      DOI: 10.1177/10775463221091334
       
  • Nonlinear aeroelastic analysis of sandwich composite cylindrical panel
           with auxetic core subjected to the thermal environment

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      Authors: Mahsa Karimiasl, Akbar Alibeigloo
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, nonlinear aeroelastic instability of a composite sandwich panel subjected to a supersonic airflow and thermal loading is investigated. The sandwich panel is composed of three-phase composites with polymer/Graphene platelet/fiber skins at the top and bottom surfaces and an auxetic honeycombs core layer with a negative Poisson’s ratio. The motion equations of the panel within the framework of higher-order shear deformation theory (HSDT) and von Kármán nonlinearity are driven. In addition to Krumhaar’s modified supersonic piston, unsteady aerodynamic pressure in the supersonic flow regime is considered. The governing equations of the sandwich panel are derived by implementing Hamilton’s principle and solved by the generalized differential quadrature method (GDQM). Validation of the present formulation is assessed by comparing the numerical results with those available in the open literature. Then, the effects of several parameters such as geometric parameters, volume fraction, Mach number, different boundary conditions, yaw angle, and different inclined angles on the nonlinear aeroelastic stability of sandwich panels are examined. Finally, it was found that the ratio of core thickness, inclined angle, and Mach number have significant effects on aerodynamic pressure.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T11:46:43Z
      DOI: 10.1177/10775463221094715
       
  • Finite wing effects on the energy harvesting from stall-induced
           oscillations

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      Authors: Carlos Renan dos Santos, Flávio Donizeti Marques
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The modeling of aeroelastic harvesters usually employs methods for two-dimensional aerodynamics. Such convenient practice reflects the lack in the literature of efficient tools with low computational cost to assess unsteady and nonlinear aerodynamics loads accounting for three-dimensional wing effects. In this sense, the present work aims to fulfill this gap by developing a nonlinear unsteady lifting line to investigate finite wing effects on the power generation from stall-induced oscillations. The aerodynamic model links the Beddoes–Leishman dynamic stall method to a linear unsteady lifting line. The optimization of energy harvesters from stall-induced pitching oscillations is revisited considering the three-dimensional aerodynamic model. Results reveal that the three-dimensional harvester’s dynamic behavior may differ from the two-dimensional case, and the harvested power reduction is observed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T11:04:27Z
      DOI: 10.1177/10775463221089732
       
  • Structural optimization and experiment of a semi-active hourglass-type
           electromagnetic isolator with negative resistance shunt circuit

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      Authors: Linwei Ji, Yajun Luo, Yahong Zhang, Shilin Xie, Minglong Xu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The present work proposed a semi-active electromagnetic isolator with negative resistance shunt circuit to improve isolation performance on micro-vibration. By an innovative combination of an hourglass-type displacement amplifier and electromagnetic mechanism with negative resistance shunt circuit, the proposed isolator can not only solve the difficulty for electromagnetic isolators to isolation micro-amplitude vibration but also achieve a significant electromechanical coupling effect to obtain excellent vibration isolation performance by a self-sensing method. First, the design of the isolator and motion relationship are presented. Then, the electromechanical coupling dynamic model of the isolator is established. Moreover, the angle of the hourglass-type displacement amplifier is optimized, and the influence of the negative resistance on the additional damping ratio and system stability is explored. Finally, the isolator was manufactured and several experiments were carried on. The experiment results demonstrated that the isolator has an excellent isolation performance. And meanwhile, the comparison between experiment and simulation also indicated the correctness of the model.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T10:56:00Z
      DOI: 10.1177/10775463221091028
       
  • Gyroscopic effect on a scaled rotor-bearing system

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      Authors: Dyah Kusuma Dewi, Zainal Abidin, Bagus Budiwantoro, Jhon Malta
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper deals with scale-fullscale models of rotor-bearing systems on rotating condition. The investigation is focused on the gyroscopic effect, which causes forward and backward whirl frequencies. When the rotor-bearing system is scaled proportionally in its dimension (height, length, and width), the scaling factor of whirl frequencies can be derived. It depends on the ratio between a transverse and polar moment of inertia on its rotating axis called the gyroscopic factor. The experimental study is conducted to validate it on three scaled rotor-bearing systems, which shifts its disc from the middle of the shaft on the scale of 1:1, 2:1, and 3:1 to clearly show the gyroscopic effect on first bending natural frequency. The scaling factor is then validated using the Campbell diagram by finding its critical speed. From this critical speed, the whirl frequencies along the range of the full-scale model speed can be obtained. The result also shows that the scaling factor remains the same whether it is at rotation or rest condition. Consideration must be made on the effect of the structural design, that is, blade and support, because of its unsymmetric stiffness that can cause backward whirl frequencies. The bearing stiffness must be ensured to be scaled proportionally, especially on journal bearing cases. This finding can be used by engineers to deal with scaling method implementation on rotating machinery design.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T10:32:43Z
      DOI: 10.1177/10775463221091338
       
  • A strategy of vibration control for rotors with dry friction dampers

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      Authors: Di Liu, Liang Zhou, Dayi Zhang, Hong Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      It is an attractive research topic to propose some novel damping methods for rotors, and the dry friction damping is probably an effective and stable method. In this paper, a control strategy is proposed based on the relationship between the rotor modal characteristics and rotor responses. Firstly, a rotor model with a new kind of dry friction damper is established and corresponding complex nonlinear modes are derived. Then, based on that, the rotor modal characteristics are analyzed, with the nonlinear damping ratio used to evaluate the damping performance. Considering the effective working region for traditional dry friction dampers is usually narrow, a control strategy suiting for a broader range of load conditions is proposed. The results show that the vibration amplitude of the rotor at critical speed can be effectively controlled by the proposed strategy, implying its prospects in engineering practice.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T07:16:15Z
      DOI: 10.1177/10775463221093105
       
  • On the influence of the elastic characteristics of composite materials on
           the vibrating properties

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      Authors: Giacomo Risitano, Lorenzo Scappaticci, Fabio Alberti, Dario Santonocito, Danilo D’Andrea
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Economical composite materials such as PA66GF35 (glass-fibre-reinforced polyamide matrix) are being increasingly used in the automotive industry. Their good mechanical characteristics combined with low density, very high workability, low production cost and high availability are attractive prerogatives that induce engineers to adopt it in complex technological challenges. Injection moulding is the most common production technology used to realize composite components. While in industrial design this type of material is considered as isotropic, it is well known that injection moulding process gives orientation to the reinforcing fibres, leading to anisotropic mechanical behaviour. Starting from these considerations, attention has been turned to the vibrating properties of such materials and to the comparison between vibration modes and mechanical properties. In fact, composite materials are also used to produce components in the automotive field significantly affected by noise problems. Since the noise derives from a fluid-structure interaction, the own frequencies and the vibrating modes cover an important role on the Noise, Vibration and Harshness performance of the components. A comparison of the vibration modes of a plate in PA66GF35, numerically modeled both as isotropic and anisotropic material according to Folgar and Tucker theory, was carried out and compared with experimental measurements. The anisotropy of the composite material is demonstrated by the variation of the mechanical characteristics obtained from the static tensile tests. Results show that injection moulding confers different mechanical properties to real components due to the intrinsic fluid-dynamic phenomena of the production process.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-12T05:01:53Z
      DOI: 10.1177/10775463221098228
       
  • Investigation of the frictional damping in friction induced vibration

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      Authors: Xiaogang Liu, Junbo Wu, Huiyang Zhou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Some phenomena of friction induced vibration can be illustrated using negative damping theory, basing on the assumption that the frictional damping of friction induced vibration is constant. The frictional damping of friction induced vibration, however, has not been investigated in details yet. In order to address this problem, a test rig is developed in this research to provide a constant sliding velocity underneath the block. In order to acquire the frictional damping of friction induced vibration, force and vibration should be measured simultaneously. As Fibre Bragg Grating sensing technology can measure distributed systems simultaneously, it is applied to develop the force sensor and acceleration sensor. The natural frequencies of these two sensors designed by finite element method are much higher than the vibration frequency of the test rig acquired with analytical method, ensuring the accuracy of measurement. The force and vibration are measured by the force sensor and acceleration sensor that connected together via one fibre, and the results show that measured dominant frequencies of force and vibration are consistent at various sliding velocities when the block vibrates steadily. In comparison, the dominant vibration frequencies of the test rig acquired by experimental method are slightly lower than the vibration frequency acquired by analytical method due to the existence of frictional damping at the contact interface. A mathematical method for the frictional damping at various sliding velocities is developed, and the results show that the frictional damping is constant when sliding velocity is beyond a certain value, which can verify the assumption that the frictional damping of friction induced vibration is constant, thus complementing negative damping theory.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-11T08:46:26Z
      DOI: 10.1177/10775463221099681
       
  • Active vibration control of heavy platform-struts structure

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      Authors: Chuang Wu, Jinan Yang, Xuxing Liu, Sujuan Jiao, Xinhua Long
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To tackle the active control problem of the heavy platform-struts structure, this paper designs a kind of hydraulic servo actuator that can withstand large static load and generate high-precision, small-amplitude dynamic forces as well, and develops a multi-channel cross-coupling suppression control algorithm that can consider the strong coupling effect in structure. Subsequently, combining the designed actuators with the control algorithm, this paper puts forward an active heavy platform-struts structure vibration control method. By embedding the designed actuators into the support struts, a platform-struts structure experimental system is constructed to assess the vibration suppression effect of the proposed method. Excited by the amplitude-varying disturbing force, four different kinds of experiments are conducted. The experimental results show that the distributed multi-channel adaptive active control method without considering the coupling effect will lead to the instability, and the vibration attenuation of the proposed method in this paper exceeds 90%. The proposed method therefore has an important potential in addressing the problem of vibration suppression in the practical engineering. In addition, it has strong convergence and robustness.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-11T07:37:20Z
      DOI: 10.1177/10775463221085042
       
  • Hydrodynamic characteristics of flow past a circular cylinder with four
           attached flexible plates in a high Reynolds number turbulent flow

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      Authors: Iman Zahed, Yasser Amini, Ehsan Izadpanah
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, the [math] model is employed to evaluate the effects of flexible plates on the hydrodynamic forces acting on a circular cylinder in turbulent flows. In this regard, four flexible plates are attached to the circular cylinder. Besides, the finite volume method and finite element method have been utilized to discretize the governing equations of the fluid flow and the flexible plates, respectively. The Reynolds number based on the cylinder diameter is kept constant at [math]. The effects of fin angle [math] and the flexural rigidity [math] on the wake structure, displacement amplitude, Strouhal number as well as lift and drag coefficients are investigated. The results showed that the flexural rigidity of plates had a significant influence on the hydrodynamic coefficients. Indeed, an increase in the non-dimensional flexural rigidity enhanced the drag coefficient, and then it approximately remained constant. For [math] the averaged drag coefficient is approximately constant and equal to 6.1. As the [math] increases, the drag coefficient increases rapidly and reaches the value of 14.37 for [math] In the second configuration [math], values of the drag coefficient for low [math] and high [math] values of flexural rigidity are equal to 7.81 and 8.79, respectively.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-09T11:07:10Z
      DOI: 10.1177/10775463221091085
       
  • Tensor product model HOSVD based polytopic LPV controller for suspension
           anti-vibration system

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      Authors: Fangwu Ma, Jinhang Li, Liang Wu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper presents a polytopic linear parameter varying (LPV) controller design methodology for nonlinear anti-vibration suspension based on stochastic road identification. As the main nonlinear component in semi-active suspension, the continuous damping control (CDC) damper value is mapped by damping velocity and control current through a bench experiment. linear parameter varying gain-scheduled method is applied for dealing with the nonlinear deterministic model. As the uncertainties caused by road stochastic excitation to suspension cannot be ignored, it is essential to identify the excitation signal as a measurable variable parameter. Empirical-mode-decomposition (EMD) and support vector machine (SVM) are utilized to identify and classify the road stochastic signal input into standard level, so polytopic LPV controller can be designed with CDC damper velocity, control current, and road level as variable parameters. Meanwhile the exponential increase of high-order plant elements in multi-parameter LPV model makes it too complicated for real-time computing. Hence the tensor product model transformation is utilized to identify the orthogonal basis of system plant so that low-rank approximation of it can be implemented by truncated high-order singular value decomposition (T−HOSVD) method. Real-time simulation shows the performance and feasibility of controller, which can efficaciously identify the road stochastic excitation as measurable variable parameters for nonlinear suspension polytopic LPV control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-09T01:50:58Z
      DOI: 10.1177/10775463211034612
       
  • Enhanced suppression of longitudinal vibration transmission in propulsion
           shaft system using nonlinear tuned mass damper inerter

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      Authors: Wei Dai, Baiyang Shi, Jian Yang, Xiang Zhu, Tianyun Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study proposes the use of a novel nonlinear tuned mass damper inerter device in vibration suppression of the ship propulsion shafting system and evaluates its performance. The device consists of an axial inerter and a pair of lateral inerters to create geometric nonlinearity. The system response subjected to propeller forces is determined by using the harmonic balance method with alternating-frequency-time technique and a numerical time-marching method. The force transmissibility and energy flow variables are employed to assess the performance of the device. The results show that the proposed device can reduce the peak force and energy transmission to the foundation while increase the energy dissipation within the device. Its use can lead to an improved vibration attenuation effect than the traditional mass-spring-damper device for low-frequency vibration. The configurations of the nonlinear inerter-based device can be adjusted to obtain an anti-peak at a resonance frequency of the original system, providing superior vibration suppression performance.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-08T05:46:30Z
      DOI: 10.1177/10775463221081183
       
  • Novel low frequency bionic vibration isolation structure

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      Authors: Xiaojie Shi, Jin Xu, Tingkun Chen, Qian Cong, Weijun Tian
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Inspired by the hind limbs of goats, a bio-inspired polygon vibration isolation structure with nonlinear stiffness and damping is proposed. The bionic mechanism consists of four bionic legs with different rods (as skeleton), 12 inclined tension springs (as muscle or tendon), a bearing platform, a base, and so on. A theoretical model is developed to characterize its stiffness nonlinearity through geometrical and mechanical analysis. Theoretical analysis shows that the bionic structure has nonlinear positive stiffness and large working range. The dynamic model of the structure is established based on the Lagrange principle, and the influence of various structural parameters on the vibration isolation performance of the structure was analyzed combined with ADAMS. Thanks to the unique bionic design, the device allows the stiffness and damping characteristics of the system to be adjusted by varying the structural parameters, resulting in excellent stability, high static and low dynamic stiffness, excellent vibration isolation performance, and good load carrying capacity without active control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-07T12:09:24Z
      DOI: 10.1177/10775463221095325
       
  • Identification of forced time-varying systems via intrinsic chirp
           component decomposition

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      Authors: Sha Wei, Hu Ding, Zhike Peng, Li-Qun Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Modal parameter identification is significant in the field of vibration and control for tracking structural vibrations and evaluating structural performances. A novel parameter identification method based on the intrinsic chirp component decomposition (ICCD) and the Hilbert transform is proposed for forced time-varying systems. The developed ICCD decomposes the measured response signal into a limited number of intrinsic chirp components, and instantaneous modal parameters of the system are identified by the Hilbert transform of each intrinsic chirp component. The effectiveness and the accuracy of the proposed approach are investigated in two case studies, that is, a discrete mass-spring-damper oscillator and a cantilever beam. Smooth and periodical parameter variations are discussed in each case. Comparison with the empirical mode decomposition based method validates that the proposed method has better identification ability on estimating the instantaneous natural frequency of the system with the presence of noise. Results demonstrate that the ICCD-based approach could be a reasonable alternative for identification of forced time-varying systems in a noise environment.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-07T01:57:37Z
      DOI: 10.1177/10775463221093104
       
  • An investigation into the effect of resilient wheel stiffness on the
           dynamic behaviour of a metro vehicle running along a tangent track

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      Authors: Xin Zhou, Shuoqiao Zhong, Xiaozhen Sheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Resilient wheels are extensively used for trams due to the noise reduction they can achieve. However, the effect of the resilient wheels on vehicle dynamics has not been adequately studied. An effort is presented in this paper, trying to bridge this gap. To simulate interactions between vehicle and track, the resilient wheel is modelled as a multi-rigid body system consisting of a rigid wheel core and a rigid rim between which a rubber layer is inserted. The rubber layer is regarded as three-directional spring-damper units, allowing the rim and core to have relative motions, so that the flexibility of the resilient wheel provided by the rubber layer is fully simulated. Then, the dynamics of a vehicle-track coupling system integrated with this resilient wheel model is simulated and compared with in-situ measurement. The simulation results show that, compared with a conventional solid wheel, the vertical vibration of the wheel core is much reduced in the frequency range of 70–300 Hz while the lateral vibration is much reduced in the frequency range of 90–300 Hz. The paper continues with the recommendation of the radial and axial stiffnesses, two key parameters of the resilient wheel, aiming to lower the wheel-rail contact force and carbody vibration.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-07T01:37:50Z
      DOI: 10.1177/10775463221094892
       
  • Effectiveness of damping and inertance of two dampers on mitigation of
           

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      Authors: Yuanyuan Wang, Shouying Li, Kai Qie, Shuai Zhou, Zhengqing Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Stay cables of several cable-stayed bridges with a span of nearly 1000 m are confronted with the simultaneous actions of low-mode rain-wind induced vibration and high-mode vortex-induced vibration. It is difficult to effectively reduce these two kinds of cable vibrations by installing one damper at the end of the stay cable. In this paper, the effectiveness of two dampers attached at the lower end of the stay cable, including viscous dampers and viscous inertial mass dampers, is investigated by the finite difference method. First, the stay cable was simplified as an inclined cable with sag, and equation of motion governing the stay cable attached with two dampers was derived. This equation was then numerically solved by the finite difference method. Second, taking Cable A30 of the Suzhou-Nantong Yangtze River Bridge as a reference, a series of numerical simulations were carefully conducted to obtain the damping ratios of the first fifty modes. The results show that it is impossible to enhance the damping ratios of all of the concerned modes up to the minimum target value only by installing a single viscous damper or a single viscous inertial mass damper at the end of the stay cable. However, two viscous dampers installed at the lower end of the cable (l1/l = 2%, l2/l = 5%) can overcome the shortcoming of a single viscous damper or viscous inertial mass damper to enhance the damping ratios of the first 34 modes up to the minimum target value (0.5%). In general, the optimized relative location of the two dampers (l2/l1) should be near 2. The optimized ratio of the damping coefficients (η1/η2) should be lower than l2/l1, and the lower limit of η1/η2 is determined by the minimum target values for modal damping ratios. Moreover, it appears that a lower installation position of two viscous dampers can realize the mitigation of higher modes even up to the 40th ∼ 50th modes.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-07T01:10:31Z
      DOI: 10.1177/10775463221091337
       
  • Low frequency noise control in duct based on locally resonant membrane
           with attached resonators

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      Authors: Jinze Li, Hongwei Zuo, Cheng Shen, Randolph CK Leung
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, locally resonant membrane with attached resonators is introduced to duct system to achieve good noise control effect especially in low frequency range. A rigorous analytical model based on modal expansion method is developed to investigate the vibroacoustic coupling characteristic of proposed duct-membrane-resonator system. The corresponding theoretical results show a good agreement with numerical simulation. The velocity distribution, sound transmission loss curve, and the mechanism behind are discussed and explained deeply. It is found that the attached resonators on the membrane can lead to new transmission loss peak which is related to but not exactly equal to the resonance frequency of attached resonator itself. Correspondence between zero equivalent density mass and transmission loss peak is achieved at the non-antisymmetric modes. Compared to single resonator, multi-resonators system can realize more transmission loss peaks for better sound transmission effect. In principle, ultra-low frequency noise reduction and arbitrarily adjustable frequency can be achieved by changing the frequency, position, and number of exerted resonators, which provide a new approach for duct noise control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-06T08:55:56Z
      DOI: 10.1177/10775463221085860
       
  • Experimental and numerical investigation of the structural dynamic
           characteristics for both surfaces of a wind turbine blade

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      Authors: Yuanchang Chen, D Todd Griffith
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Wind turbine design and operation will benefit from a better understanding of blade dynamics. Usually, only one surface or one side of a 3D structure is measured in Scanning Laser Doppler Vibrometer (SLDV) tests due to test setup and instrumentation limitations. However, in this work, we demonstrate an approach to overcome these limitations while also using an SLDV that provides high spatial resolution measurement. In the case of a wind turbine blade, only one surface is typically measured; however, it is beneficial to investigate both blade global modes and the relative motions of the two blade surfaces by using both numerical models and experimental tests. This work creatively develops both experimental and numerical approaches to investigate the dynamics and the relative motions of both surfaces of the wind turbine blade from global and local perspectives. On the experimental side, experimental modal testing is conducted on both surfaces of the wind turbine blade with a high spatial resolution 3D SLDV. The two surfaces of the wind turbine blade are measured and stitched together to build the blade experimental mode shapes of both surfaces. A total of over 1500 points are scanned from both surfaces of the blade in a non-contact fashion to obtain not only the global bending modes (flap-wise and edge-wise), the global torsional modes, but also the localized panel mode shapes. On the numerical side, a finite element model of the blade is developed to obtain the numerical mode shapes. The experimental mode shapes on either one surface or both surfaces of the blade are used to validate the blade finite element model. The mode shape correspondence between the model and the test is also identified. With the availability of both experimental and numerical mode shapes, localized panel modes of the wind turbine blade are observed and characterized, and as a result the numerical model is validated. This work provides useful case studies for the design and structural analysis of wind turbine blades based on both the experimental observations and the validation of numerical models typical of those used for blade design and blade structural analysis.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-06T08:33:42Z
      DOI: 10.1177/10775463221097470
       
  • Dynamic model and integrated optimal controller of hybrid arms robot for
           laser contour machining

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      Authors: Esmail Ali Alandoli, T.S. Lee, V. Vijayakumar, Y.J. Lin, Marwan Qaid Mohammed
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The hybrid arms robot (HAR) is a new modified robot which consists of a rigid link (RL) and a flexible link (FL), and it carries a laser head at the end-effector for laser contour machining (CM). The HAR is inspired from a rigid-flexible links manipulator (RFLM) and the aim is to bring the advantages of flexible link manipulators (FLMs) to industrial robots. The HAR gains the advantages of lightweight robots and FLMs such as fast response, less power consumption due to using small actuators, low cost, and safe to surrounding operators. However, the HAR has the drawback of a tip vibration caused by the flexibility of the second FL and leads to a position error at the end-effector position. Furthermore, the HAR has more parameters to be incorporated in a dynamic model such as the tip vibration, the laser head weight, and a force generated by the assist gas pressure. This research aims to obtain the dynamic model of the HAR using the finite element method (FEM) in conjunction with the Lagrangian equation and to propose an integrated optimal controller (IOC) which is an integration of a linear quadratic regulator (LQR) and a fuzzy logic controller (FLC). The derived dynamic model of the HAR is efficient due to the close match response with the SimMechanics model response of the HAR. The proposed IOC is tested for point-to-point (PTP) position control of the HAR and demonstrates improved response and better capability for the tip vibration suppression. The proposed IOC also reveals enhanced triangular CM trajectory, rhombic CM trajectory, and circular CM trajectory of the HAR laser head compared to the LQR performance in a proper cutting speed to ensure the machining quality.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-06T04:32:40Z
      DOI: 10.1177/10775463221090000
       
  • Output feedback control for the driving cylinder of hydraulic support with
           error constraint

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      Authors: Yunfei Wang, Jiyun Zhao, Hao Wang, Haigang Ding
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The position control of the driving cylinder of hydraulic support affects the straightness of the underground coal mining face, so this paper focuses on improving tracking performance of the driving cylinder system. Since only position signal of the system is measurable, a Levant differentiator is designed to estimate the velocity and acceleration of the driving cylinder system, which can reduce the effect of the measurement noise. Besides, the parameter changes, modelling errors and external disturbances are treated as a lumped disturbance, an extended disturbance observer is constructed to estimate the lumped disturbance and compensate for the proposed controller. Moreover, barrier Lyapunov function is introduced to limit the tracking error into a small set around zero, and then the stability of the close-loop system is proved. Both the performance of differentiator and disturbance observer is verified in simulation experiments in MATLAB/Simulink. Finally, an experiment rig for the driving cylinder system of hydraulic support is established and comparative experiments are carried out. The experiment results show that the proposed extended disturbance observer-based output feedback controller with error constraint has a satisfied effectiveness in improving tracking performance.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-06T03:20:13Z
      DOI: 10.1177/10775463221091336
       
  • Optimization of structural design with pendulum dynamic vibration absorber
           using genetic algorithm

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      Authors: Hoo Min Lee, Sol Ji Han, Deok-Soo Kim, Gil Ho Yoon
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, a genetic algorithm is introduced to determine optimal locations of pendulum dynamic vibration absorbers (PDVAs) in vibrating structures. A PDVA is composed of a pendulum system and spring-mass system, and aims to attenuate structural vibrations at two resonance frequencies, that is, the square root of stiffness over mass and square root of a length over gravity of the hosting structure. An optimization method involving nonlinear transient finite element analysis was applied to increase the engineering efficiency of PDVAs. With the incorporation of a genetic algorithm, the optimal locations of PDVAs in various structures can be determined and vibrations at the desired resonant frequencies can be attenuated. In addition, the Voronoi diagram concept is applied to realize a uniform distribution of PDVAs in vibrating structures. Several optimization examples were solved using the proposed genetic algorithm and demonstrated decreases in frequency responses by up to 98.6549%, showing the effectiveness of PDVAs in suppressing structural vibrations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T11:49:58Z
      DOI: 10.1177/10775463221090325
       
  • Imaging method of interfacial anomalies in layered structures

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      Authors: Jiaqi Wang, Bing Li, Fanghao Pang, Yunfei Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Layered structures are progressively critical to several fields like aerospace, pipeline transportation, and petrochemical engineering. However, the anomalies located on the interfaces between the layers are troublesome yet problematic to image through traditional non-destructive evaluation methods. This study presented an imaging method utilizing interface waves and visualized the interfacial anomalies in layered structures. The paper first derived and solved the dispersion equations of a layered plate. The wave structure of the interface waves and their interaction mechanisms with interfacial anomalies make them inherently sensitive to interfacial anomalies. Moreover, the interface wave modes are non-dispersive at high frequencies, causing macroscopic differences between the signals with or without abnormal features. On that basis, correlation analysis and probabilistic reconstruction formed the imaging algorithm in this work. Lastly, the experimental system was tested on two different layered metal plates. The results show that the system can precisely depict interfacial anomalies of different shapes. Especially for the circular anomalies, the produced images coincide with the pre-manufactured defects with relatively minor errors of location and area.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T11:02:15Z
      DOI: 10.1177/10775463221089441
       
  • Vibration suppression and energy absorption of plates in subsonic airflow
           using an energy harvester enhanced nonlinear energy sink

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      Authors: Guo Yao, Yu Qiao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a nonlinear energy sink (NES) and a giant magnetostrictive-piezoelectric (GMP) energy harvester (NES-GMP) are investigated to suppress the nonlinear aeroelastic responses and to absorb the mechanical energy of an embedded plate interacting with external subsonic airflow. The analytical model of the embedded plate attaching the NES-GMP is established by using the Hamilton’s principle based on the Kirchhoff plate theory and incompressible subsonic aerodynamic model. The natural frequencies of the plate with the NES-GMP and with the NES are analyzed by solving the generalized eigenvalue problems. The global amplitude-frequency responses of the pure plate, the plate with NES, and the plate with NES-GMP are compared to show the vibration suppression effects of the proposed method. Based on the energy analysis, the energy transfer mechanisms of the plate with the NES-GMP are studied. The results reveal that the input energy of the NES-GMP converts into the strain energy by the Terfenol-D layer and then transforms into the electric energy by the piezoelectric layer. Furthermore, numerical simulations also indicate that the maximum harvested energy is obtained when the airflow velocity approaches the critical divergence flow velocity of the plate, and the most effective harvesting installation position is in a specific annular region near the edge of the plate.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T10:55:28Z
      DOI: 10.1177/10775463221077779
       
  • Experimental investigations on the semi-active control of a valve-driven
           secondary lateral damper for a high-speed rail vehicle

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      Authors: Yi Wu, Feng Gan, Huailong Shi, Jing Zeng, Chunpeng Chen, Yonghua Feng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Passive suspensions cannot sufficiently reduce vehicle vibrations on tracks with poor irregularities or when the vehicle was operated at higher speeds. This study proposes three semi-active control algorithms for a secondary lateral damper to enable the vehicle to be operated on high-speed dedicated railways at 350 km/h and conventional low-speed railways at 160 km/h. A high-speed rail vehicle dynamics model with controllable dampers is built to study the feasibility of those algorithms through numerical investigations. Then, both field tests on track and lab tests on a full-scale roller rig were performed to examine the functionality of the controller hardware system and the valve-driven semi-active damper. Furtherly, a time-delay compensation based on the signal amplitude is developed and verified. Results from the on-track and roller rig tests state that the proposed semi-active control algorithms and the designed control system can effectively improve the ride quality of the vehicle when it is put into operation in different track conditions and at various speeds.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T06:39:56Z
      DOI: 10.1177/10775463221090322
       
  • An innovative semi-active pendulum tuned mass damper and its application
           in vibration control

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      Authors: Maryam Sadat Maddah Sadatieh, Amir K Ghorbani-Tanha
      Abstract: Journal of Vibration and Control, Ahead of Print.
      An innovative Semi-Active Pendulum Tuned Mass Damper (SAPTMD) with variable frequency is introduced in this paper. The SAPTMD consists of two identical pendulum systems, each consisting of a pendulum and two springs attached to the pendulum mass. The pendulums are mounted on two boxes that can rotate symmetrically around the horizontal shafts that pass through them. Due to the change in inclination of the pendulum systems and, consequently, the orientation of the oscillating pendulums, the frequency of the proposed system can change within a predefined range. Besides, the need for less height for installation is another advantage of the SAPTMD over the conventional pendulum tuned mass dampers. In order to show the efficiency of the SAPTMD, it is attached to a single degree of freedom primary system excited similar to excitation due to an unbalanced rotating machinery during its start-up period. The SAPTMD’s performance is compared with a classical tuned mass damper. As it is shown, the response of the primary system is reduced noticeably. Furthermore, the performance of the system is improved by utilizing a fuzzy Proportional-Integral-Derivative (PID) controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T06:33:54Z
      DOI: 10.1177/10775463211070903
       
  • Time-varying disturbance observer based on sliding-mode observer and
           double phases fixed-time sliding mode control for a T-S fuzzy
           micro-electro-mechanical system gyroscope

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      Authors: Van Nam Giap, Quang Dich Nguyen, Nguyen Kien Trung, Shyh-Chour Huang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper proposes a new disturbance observer concept based on the information of the estimated and measured signals for a micro-electro-mechanical system. First, the sliding-mode observer based on the linear matrix inequality was designed to estimate the states of a micro-electro-mechanical system gyroscope. Second, a new disturbance observer was proposed for estimating perturbations of the T-S fuzzy micro-electro-mechanical system gyroscope. Third, the double phase’s fixed-time sliding-mode control was designed to control the positions and velocities of the MEMS system. The proposed disturbance observer input signals were taken into account from the measured and estimated signals. Two cases of high magnitudes and high frequencies disturbances were used to test the power of the proposed disturbance observer. Fourth, the Lyapunov condition was used to verify the corrections of the proposed controller and observer. Finally, the simulation by using MATLAB software was used to show the power of the proposed methods. The achievements of the small reaching-time, small tracking error, and stable steady-states under the vibration form outside of the system.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-05T02:14:00Z
      DOI: 10.1177/10775463211073199
       
  • Research on detection and recognition methods of gas pipelines based on
           acoustic signal feature analysis

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      Authors: Enbin Liu, Zhaorong Wen, Bingyan Guo, Bin Yu, Qikun Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In the process of reconstruction and expansion of gas pipeline, it is easy to destroy in-service gas pipeline and cause safety accidents. In order to realize the detection of in-service pipelines, based on the characteristics of low sound pressure level and easy attenuation of acoustic signals of gas pipelines, the detection and identification method of gas pipelines based on acoustic signal feature analysis was studied by using Hilebert–Huang transform algorithm and optimized Back Propagation (BP) neural network. This method takes the gas pipeline flow noise signals obtained by numerical simulation and experimental verification as the research object, and the underwater acoustic signals are collected for comparative analysis. Empirical Mode Decomposition (EMD) was used to decompose the two signals, and the time-domain waveform of Intrinsic Mode Functions (IMF) component was obtained, and the characteristic parameters of peak value and peak frequency were determined. The energy characteristic parameters of Hilbert marginal spectrum were calculated, and the characteristic database of gas pipeline flow noise signal was obtained. The optimized BP neural network was used for pattern recognition. The results show that the identification rate of gas pipeline acoustic signal can reach 97.5% by using this method, which verifies the effectiveness of the gas pipeline detection and identification method in this paper.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-04T06:30:04Z
      DOI: 10.1177/10775463221082754
       
  • Half sine shock on random control method for multi-axial vibration testing

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      Authors: Yi Ma, Huaihai Chen, Xiangyu Lu, Ronghui Zheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Control method for the multi-axial half sine shock on random vibration test is studied in this article. From the Fourier spectrum analysis, it is found that the power of the half sine shock is mainly concentrated within a specific frequency band, which is only related to the sine frequency of the half sine shock. Compared with the broadband random signal, the frequency band occupies a small range. Therefore, a mixed signal separation method is proposed for the shock on random vibration control test. Firstly, the Fourier spectrum is divided into two parts, and then the Empirical Wavelet Transform (EWT) is used to extract the shock component from the mixed signal. Afterward, the random component is obtained by subtracting the shock component from the mixed signal. According to the deviations between each component and the specified references, the amplitudes of the shock component and the Power Spectral Densities (PSDs) of the random component are controlled by the amplitude correction algorithm and the matrix power control algorithm, respectively. An experiment with tri-axial shaker is implemented and the results show that the proposed method is feasible for the multi-axial half sine shock on broadband random vibration control test.
      Citation: Journal of Vibration and Control
      PubDate: 2022-05-02T09:25:54Z
      DOI: 10.1177/10775463221090008
       
  • Practical adaptive position feedback regulator for parallel robots with
           bounded inputs

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      Authors: M Reza J Harandi, A Hassani, SA Khalilpour, Hamid D Taghirad
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper addresses the regulation problem of parallel robots by a proportional derivative plus desired gravity compensator (PD-DGC) controller. Due to inaccurate measurements, unmodeled dynamics, and vibrations specially in cable-driven robots and external disturbance in practice, the model of the robot is often plagued with kinematic and dynamic uncertainties. In this paper, two new generations of PD-DGC controller, namely adaptive with respect to the parameters in gravity term, and time-varying PD-DGC in the presence of bounded disturbance, are proposed. Toward not requiring accurate velocity measurement, PD-DGC with merely position feedback in complement to the time-varying controller is designed in the presence of bounded control efforts. Incorporating both methods to establish a simple but strong robust adaptive controller is also investigated by adding an extra assumption on adapted parameters. The asymptotic stability of the closed-loop system is analyzed by the Lyapunov direct method. Experimental results on 2-DOF eye surgery and 3-DOF flexible link ARAS cable-driven robot demonstrate the effectiveness of the proposed approaches in practice.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-29T12:26:26Z
      DOI: 10.1177/10775463221083361
       
  • Adaptive fuzzy PID control based on nonlinear disturbance observer for
           quadrotor

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      Authors: Ali Ghasemi, Mohammad M Azimi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the composite control of position and orientation of the quadrotor for tracking purposes are investigated. The quadrotor is an underactuated nonlinear system. So, based on the introduced virtual inputs the quadrotor is transformed into an actuated system. External disturbances and different sources of uncertainty such as input saturation are considered in the dynamic model of the quadrotor. Also, after transform implementation, some complicated terms appear which are considered as other sources of uncertainty. To guarantee the stabilization and tracking goals of the quadrotor in the perturbed model, the composite adaptive fuzzy PID-Like controller is proposed. This controller consists of three parts where the innovation of the paper appears in all terms. The main term is an adaptive fuzzy PID-like controller which able to approximate the coefficients of PID based on the decentralized fuzzy logic. Then, a H∞ compensator based on a modified Riccati-like equation is presented; which can attenuate the fuzzy approximation errors. Also, as the last term of the composite controller, the modified disturbance observer is designed that estimates the uncertainty and disturbance. The experimental result shows that the proposed method leads to resilient stabilization and tracking in comparison with conventional methods.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-29T11:34:39Z
      DOI: 10.1177/10775463221089734
       
  • Free vibration and stability analysis of a functionally graded cylindrical
           shell embedded in piezoelectric layers conveying fluid flow

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      Authors: Zohreh Ebrahimi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A general formula is presented for the free vibration problems of the functionally graded (FG) cylindrical shells embedded in piezoelectric layers conveying fluid flow. The 3D elasticity theory is used to derive cylindrical shell equations of motion. The cylindrical shell is assumed to be multi-layered and is coupled with an incompressible fluid flow, where the fluid-structure interaction is applied at the inner surface of the shell. A potential flow theory is used to model the incompressible fluid flow. Some solutions of the cylindrical shell without fluid are used for model validations. A stability analysis has been performed to establish the instability boundary of the hybrid shell. The results of the free vibration analysis show that the natural frequency decreases with increasing the fluid velocity. The 3D elasticity theory applied here has resulted in high-accurate numerical solutions. A parametric study is performed to establish the effects of the shell thickness to mid-radius, length, and vibrational mode numbers on the critical velocity of the FG shell bonded to piezoelectric layers.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-29T09:17:01Z
      DOI: 10.1177/10775463221081184
       
  • Investigation on the EPC method in analyzing the nonlinear oscillators
           under both harmonic and Gaussian white noise excitations

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      Authors: Zhihui Zhu, Wei Gong, Zhiwu Yu, Kun Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The objective of the current paper is to study and extend the exponential-polynomial-closure (EPC) method in analyzing the non-stationary response probabilistic solutions of nonlinear stochastic oscillators excited by combined deterministic harmonic and Gaussian white noise excitations. The probabilistic solution of the non-stationary responses of nonlinear stochastic oscillator is expressed as an exponential function of polynomial with time-variant coefficients and then the Fokker–Planck–Kolmogorov equation is solved approximately. Two validation examples are presented. The results obtained by Monte Carlo simulation (MCS) and EPC method are presented to show their good agreement, which confirms the effectiveness of the EPC method for the probabilistic solutions to nonlinear stochastic oscillators. The advantage of the EPC method for analyzing the oscillators with strong nonlinearities is investigated by comparison with Equivalent Linearization method. Furthermore, compared with MCS, the computational efficiency by using the EPC method is increased by about 56 times in the first example and 44 times in the second example.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-28T02:28:40Z
      DOI: 10.1177/10775463221089424
       
  • Nonlinear modal analysis of rotor systems considering gyroscopic and dry
           friction effects

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      Authors: Donglai Yang, Xingrong Huang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Part looseness is a common fault in rotor systems, which may lead to serious dynamic problems. Rotor system with part looseness turns to be a complicated nonlinear problem, with gyroscopic and dry friction effects occurring simultaneously. The analysis of nonlinear systems is in general confronted with two key challenges: complicated calculation method and long calculation time. This work has developed a fast and efficient numerical scheme based on nonlinear modal analysis. By employing the proposed nonlinear modal analysis strategy, the essential gyroscopic effect, as well as the dry friction influence caused by part looseness, are both taken into account when analyzing the dynamic behavior of rotor systems. First, the theoretical aspects and the analysis approach considering the nonlinear force and the gyroscopic effect are proposed for a general rotor system. Second, by employing the proposed nonlinear modal strategy, simulations are conducted on a general rotor system considering the gyroscopic effect and dry friction caused by part looseness. Third, modal parameters such as resonance frequencies and modal damping ratios are carefully investigated as functions of rotation speed and modal amplitude. In the realization of a nonlinear modal analysis of a rotor system, the key point is to establish the relationship between modal parameters with both modal amplitude and rotation velocity. The proposed strategy can help better analyzing and interpreting the dynamic characteristics of rotor systems from the modal overview.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-28T02:20:08Z
      DOI: 10.1177/10775463221083357
       
  • Effect of long-wave deviation of stator plane on high-speed maglev train
           and guideway system

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      Authors: Xiangfu Tian, Huoyue Xiang, Jin Zhu, Yongle Li, Min Zeng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Pre-stressed concrete hybrid guideways are often used in the high-speed maglev transit system. The long-wave deviations of the stator plane based on the initial pre-camber could be possibly caused by temperature and concrete creep. When the high-speed maglev train moves over the guideways system, significant vehicular vibration could be triggered by the long-wave deviations. In the present study, the influence of the long-wave deviations on the dynamic characteristics of high-speed maglev train is investigated. First, the vertical analysis model of the coupled maglev train-guideway system is presented, and the loading model of long wave deviations of the stator plane is determined. Then, the effect of several key parameters, that is, initial pre-camber, the long wave deviations levels, train speeds, and the bridge span, on the dynamic response of maglev train-guideway system is evaluated. The results show that the initial pre-camber will improve the driving safety index and riding comfort level, especially for the middle vehicle of the high-speed maglev train. The results also indicate that the existence of long-wave deviation on the stator plane could deteriorate the driving safety and comfort level of the vehicle. Meanwhile, higher train speed and long-wave deviations levels as well as larger bridge span result in larger vehicle dynamic response.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-27T09:30:15Z
      DOI: 10.1177/10775463221078653
       
  • High-speed elevator car system semi-active horizontal vibration reduction
           method based on the improved particle swarm algorithm

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      Authors: Zili Wang, Lemiao Qiu, Shuyou Zhang, Guannan Su, Linhao Zhu, Xuewei Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      As the field of modern high-rise buildings advances, the demand for the high-speed elevator increases. The high-speed elevator car vibration directly affects the riding comforts, among which the high-speed elevator car horizontal vibration has the most pronounced effect. Previous researches indicate that the semi-active vibration reduction method is an effective horizontal vibration reduction method for elevator car, which has the characteristics of low energy consumption, suitable for high-speed elevator, while its adaptability is relatively weak. To address the adaptability issue, we proposed a semi-active high-speed elevator car horizontal vibration reduction method based on the improved particle swarm algorithm. To verify the feasibility of the proposed method, it is applied with a magneto-rheological damper in the KLK2-type elevator from Canny Elevator Co, Ltd The horizontal vibration results are compared with ones of the passive vibration reduction method and other algorithm-based vibration reduction methods. The vibration reduction method proposed in this paper is superior to all other mentioned methods in terms of the peak-to-peak value and the A95 value of the vibration acceleration. The horizontal vibration acceleration performance of the HSEC is improved by about 70%.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-26T07:09:07Z
      DOI: 10.1177/10775463221089425
       
  • Simple adaptive V-stack piezoelectric based airfoil flutter suppression
           system

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      Authors: Carmelo R Vindigni, Calogero Orlando
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The suppression of aeroelastic vibrations due to flutter using a trailing edge flap is analyzed to increase the speed operability range of wings. The aeroelastic model of a 3DOF airfoil in incompressible flow is presented and an augmented state-space representation is used for the time domain analysis. A finite element model of a V-stack piezoelectric actuator, used to move the trailing edge flap, is introduced to model the actuator dynamics. The use of the simple adaptive controller is investigated to realize an adaptive flutter suppression system. A parallel feedforward compensator is tuned to make the plant almost strictly passive and a metaheuristic algorithm is used to determine the invariant parameters. Numerical simulations are carried out to verify the performance of the simple adaptive flutter suppression system in presence of speed variations and disturbances. Numerical results proved that the SAC flutter suppression system improves the closed loop system flutter boundary with respect to a gain scheduled PID controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-26T06:09:28Z
      DOI: 10.1177/10775463221085854
       
  • A hierarchical deep learning framework for combined rolling bearing fault
           localization and identification with data fusion

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      Authors: Mingxuan Liang, Kai Zhou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Fault diagnosis of rolling bearings becomes an important research subject, where the data-driven deep learning-based techniques have been extensively exploited. While the state-of-the-art research has shown the substantial progresses in bearing fault diagnosis, they mostly were implemented upon the hypothesis that the location of bearing prone to failure already is known. Nevertheless, in actual practice many rolling bearings are installed in a complex machinery system, any of which is likely subject to fault. As such, fault diagnosis essentially is a process to achieve both fault localization and identification, which results in many fault scenarios to be handled. This will significantly degrade the fault diagnosis performance using conventional deep learning analysis. In this research, we aim to develop a new deep learning framework to address abovementioned challenge. We particularly design a hierarchical deep learning framework consisting of multiple sequentially deployed deep learning models built upon the transfer learning. This can improve the learning adequacy for a high-dimensional problem with many fault scenarios involved even under limited dataset, thereby enhancing the fault diagnosis performance. Without the prior knowledge regarding the fault location, this methodology is greatly favored by the sensor/data fusion which takes full advantage of the enriched pivot fault-related features in the measurements acquired from different accelerometers. Systematic case studies using the publicly accessible experimental rolling bearing dataset are carried out to validate this new methodology.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-26T04:47:49Z
      DOI: 10.1177/10775463221091601
       
  • Investigations of the effects of a passive bumper on the seismic response
           

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      Authors: Weijian Zhong, Yanhui Liu, Oya Mercan, Fulin Zhou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The horizontal displacement values experienced by the isolation layer of base-isolated buildings can exceed the allowable range and cause failures during the rare or very-rare earthquakes. Excessive horizontal displacements of the isolation layer may cause collisions between the building and retaining walls of the isolation ditch and even cause the collapse of the isolated building. This paper proposes a cost-effective, easy-to-build, passive bumper device, called Flexible Limit Protective Device (FLPD) in order to act as shock-absorbers. Through numerical simulations and experiments, the nonlinear behavior of the FLPD is investigated. Subsequently, through structural simulations, the effectiveness of using FLPDs is studied. The elitist non-dominated sorting genetic algorithm (NSGA-II) is used to optimize the design of FLPDs, and the response of structures equipped with optimized FLPDs are simulated numerically. The results indicate that proposed optimized FLPDs can effectively work as shock-absorbers for base-isolated structures. This paper can provide a guideline for the design of shock-absorbers.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-25T11:03:38Z
      DOI: 10.1177/10775463221086351
       
  • Vibration reduction control by a cable actuation system for reflector
           antenna

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      Authors: Wei Liang, Yide Geng, Jin Huang, Jie Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Vibration deformation of a reflector antenna under a moving load will reduce pointing performance. Current vibration suppression technology for reflector antennas, such as the application of mesh reflector antennas, the construction of large radomes, the use of antennas with high stiffness, and the improvement of the shaft servo systems, can reduce the impact of vibrations. However, the disadvantages of high-frequency transmission, high cost, increased weight, and servo bandwidth limitations, are unavoidable. A cable actuation system is proposed as a method for reducing the vibration of reflector antennas while having little influence on the original structure. In this method, the acceleration of the reflector is measured, and an unbiased minimum variance estimator of the system state is introduced to observe the vibration state of the reflector. Then using the LQR approach, drivers on the slide rail pull the cables to suppress the vibration of the reflector. Moreover, the position of the drivers on the slide rail can be adjusted depending on the moving load condition. Finally, the experimental results show that the vibration time of the reflector without control was approximately 7 s, while the vibration time of the reflector with control was reduced to approximately 1 s when the pendulum fell from the same height to excite the reflector.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-25T06:50:08Z
      DOI: 10.1177/10775463221088377
       
  • Adaptive control of robot manipulators driven by permanent magnet
           synchronous motors using orthogonal functions theorem

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      Authors: Saeed Khorashadizadeh, Majid Moradi Zirkohi, Hussein Eliasi, Reza Gholipour
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper is devoted to designing a simple tracking controller for robot manipulators driven by permanent magnet synchronous motors (PMSMs) using orthogonal functions. The whole control system including robot manipulator and PMSMs is formulated in such a way that the voltages along the “d” and “q” axes of the PMSMs are considered as the control inputs. In the core of the proposed approach, uncertainties including external disturbances and system dynamics are estimated and compensated using orthogonal functions. Based on the Lyapunov stability theory, the unknown coefficients of the basis functions are tuned online using the derived adaptation laws. A performance evaluation is presented to guarantee the satisfactory operation of the proposed controller in the transient state. The case study is a spherical manipulator driven by PMSMs. The comparative simulation results confirm that the proposed control approach shows a superior performance regarding tracking objectives with a less computational burden.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-25T05:14:52Z
      DOI: 10.1177/10775463221085784
       
  • Analysis of the vibration of a cracked ferromagnetic rectangular plate in
           a transverse magnetic field

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      Authors: Yun-Shih Wang, Yan-Shin Shih
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The vibration of a cracked rectangular plate that is subject to an in-plane force and a transverse magnetic field and is simply supported at all its edges is considered. Based on the von Kármán plate theory, the equation of motion, including an in-plane force, a transverse magnetic field, and a damping coefficient, is derived. This study focused only on the first mode of natural frequency in the vibration. The nonlinear natural frequency is affected by the crack length and aspect ratio. These results are observed to be similar to those reported in the literature. The equations of vibration are reduced to an ordinary differential equation by assuming mode shape and using the Galerkin method. The natural frequency is determined using an ordinary different equation. Using the Runge–Kutta method, the amplitude–time, and velocity–amplitude relationships are determined. The effects of several vibrational parameters—such as the in-plane force, transverse magnetic field, damping coefficient, and crack length—on a cracked plate are considered and discussed in this study. The vibration of plate has been one of the interesting fields of research. Although vibration characteristics of cracked plate have extensively been performed, and have given rise to notable scientific achievements, the vibration of ferromagnetic crack plate is yet to be explored. The derivation in this study determines the vibration of a cracked rectangular plate in a magnetic field and is presented to bring out the effects of crack ratio on vibration.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-24T07:00:49Z
      DOI: 10.1177/10775463221081181
       
  • Analyzing free vibration of a beam-type liquid micro-pump with free
           boundary approach

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      Authors: Hamed Hatami, Ahmad Bagheri, Reza Ansari
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The purpose of this article is the comprehensive analysis of free vibration of beam-type liquid micro-pump with a free boundary approach. Besides the liquid loading on the micro-beam, the kinematic compatibility between liquid and micro-beam is modeled according to the free boundaries. Galerkin and separation of variables methods are employed to solve these equations. Based on the nonlinear nature of the equations, the Newmark method is applied to obtain the normal frequencies, mode shapes, and the fluid oscillation of the coupled system. The aim of this model is to achieve the exact results for the small oscillations of micro-beam in the liquid container. Comparing the free and fixed boundary method reveals that for small oscillation of Euler–Bernoulli micro-beam, there is a slight deviation on the natural frequency, which can be negligible.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-23T08:38:54Z
      DOI: 10.1177/10775463221089440
       
  • Shape monitoring and damage identification in stiffened plates using
           inverse finite element method and Bayesian learning

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      Authors: Shumao Qiu, Ziyan Wu, Mengying Li, Haifeng Yang, Feng Yue
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Stiffened plate structures are common structural forms that are widely used in various fields. Structural Health Monitoring (SHM) is an important tool to maintain their safe operation. The inverse finite element method (iFEM) is a state-of-the-art methodology for SHM that can precisely reconstruct full-field displacements through limited strain sensors. In this paper, we study the stiffened cantilever plate and propose a complete damage localization and quantification system based on iFEM. By solving the damage location index, we can recognize the damage locations in real time, independent of loads and load combinations. Moreover, the strain modes at strain sensors are obtained by modal tests, which can be transformed into full degrees of freedom (DOFs) mode shapes by the iFEM. The damage severities can be further determined using the Bayesian learning (BL) algorithm. In this way, the mode shapes required for damage identification are transformed into strain modes which are easier to obtain, especially for structures with rotational DOFs such as plates and shells. Considering different damage scenarios, the proposed method can detect true locations and severities of damage even with a limited number of strain sensors and under measurement noise.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-23T01:09:50Z
      DOI: 10.1177/10775463221081182
       
  • Mathematical modeling and partial feedback linearization control of a
           constrained and underactuated space tether

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      Authors: André Fenili
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates the application of the nonlinear control technique called collocated partial feedback linearization to the position and stretching control of a planar underactuated mechanical system. This system is designed to emulate under certain conditions the behavior of a space tether connected to one mass (representing a satellite) at each of its extremities. The flexible cable is approximated by two rigid bodies (thin rods) with springs and dampers attached to represent the cable stiffness and structural damping. The control objective is to move both satellites to its desired positions and to guarantee that on the final configuration the tether is completely stretched. The stability of the closed-loop system is verified and it is proved that the system has global asymptotic stability. The performance of the proposed nonlinear control technique is analyzed via numerical simulations for two cases: one case considering three different values for the damping coefficients and one case considering three different values for the stiffness coefficients. The simulation results show that the collocated partial feedback linearization plus a proportional-derivative control is able to move the satellites to the desired positions and to keep the cable stretched.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-22T10:37:15Z
      DOI: 10.1177/10775463221084402
       
  • Analysis of vibration suppression performance of parallel nonlinear energy
           sink

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      Authors: Weizhi Song, Zhien Liu, Chihua Lu, Bin Li, Nie Fuquan
      Abstract: Journal of Vibration and Control, Ahead of Print.
      With the increase of excitation, the nonlinear energy sink (NES) will cause the controlled system to produce high branch response and lead to sudden failure. Increasing the mass of the NES can prevent the generation of high branch within a certain range, but high-precision instruments such as aerospace have strict requirements for additional mass. A parallel NES (PNES) is proposed to improve the robustness without increasing the mass. The slow flow equations of the system are derived by using complexification-averaging (CX-A) method, and the vibration suppression performance of the PNES is analyzed from the frequency domain. Compared with purely cubic stiffness NES (CNES), it is found that PNES has better performance near the main resonance. And it is not easy to produce high branch response under the same excitation intensity. Finally, the performance of PNES and CNES is compared by numerical method from time domain and energy spectrum. The results show that when PNES is attached, the attenuation time of the controlled system is shorter under impact excitation, much more, the controlled system has a smaller energy amplitude near the main resonance under harmonic excitation.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-22T09:39:21Z
      DOI: 10.1177/10775463221085867
       
  • Free and forced nonlinear vibrations of Bi-Directional functionally graded
           Euler–Bernoulli porous beams

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      Authors: Ma’en S Sari, Sameer Al-Dahidi, Bashar Hammad
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, the free and forced vibrations of a bi-directional functionally graded porous beam are investigated. The governing equations of motion are derived by Hamilton’s principle, and the reduced temporal equation of motion with cubic and quintic nonlinear terms is obtained using the Galerkin approach. Analytical solutions for the nonlinear natural frequencies in addition to the primary resonance response curves are established by the method of multiple scales. The effects of the axial and transverse functionally graded indexes, initial amplitude, porosity parameter, and the elastic and mass density ratios on the nonlinear frequencies and the forced responses are examined.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-22T09:19:47Z
      DOI: 10.1177/10775463221084399
       
  • Nonlinear frequency behavior of cracked functionally graded porous beams
           resting on elastic foundation using Reddy shear deformation theory

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      Authors: Mohammadamin Forghani, Yousef Bazarganlari, Parham Zahedinejad, Mohammad Javad Kazemzadeh-Parsi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper presents the nonlinear frequency behavior of cracked functionally graded porous beams subjected to various boundary conditions using Reddy shear deformation theory and Green’s tensor together with the Von Karman geometric nonlinearity. The material properties of the beam vary exponentially in thickness direction. A generalized differential quadrature method (GDQM) in conjunction with a direct numerical iteration method is developed to solve the system of equations derived by means of Hamilton’s principle. Demonstrating the convergence of this method, the verification is performed by using extracted results from a previous study based on the Euler and Timoshenko beam theory. The results for extensive studies are provided to understand the influences of the different gradient indexes, vibration amplitude ratios, porosity indexes, shear and elastic foundation parameters, and boundary conditions on the nonlinear frequency behavior. The location of crack plays the significant role on the nonlinear frequency ratios. The frequency ratios hit the minimum when the crack is located in mid-span of the beam. In this regard, the effect of shear stiffness of foundation is much more than that of Winkler one in the increasing mid-span value of nonlinear frequency ratio. It is also shown that the crack location results in decline of frequency ratios in the mid-span of beam specially for the cracks located closer to surface, the deeper ones lead to get nonlinear frequency ratios rise much more due to the fact that the deeper the crack is, the weaker the crack section becomes. The results of this paper and the effects of these parameters can be used in the optimal design of functionally graded beams and in crack prediction, detection, and monitoring techniques.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-21T02:00:13Z
      DOI: 10.1177/10775463221080213
       
  • An analytical investigation into the vibration behavior of an orthotropic
           steel deck

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      Authors: Xun Zhang, Yingchuan You, Derui Kong, Tao Chen, Jinrui Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Due to advantages such as small weight, large load capacity, and easy manufacturing, orthotropic steel decks (OSDs) are widely used in many steel bridges. As an important component of steel bridge decks that bear vehicle loads, OSDs may produce excessive vibrations and corresponding noise due to low dead loads. Therefore, it is important to study the vibration behavior of OSDs to guide the design to reduce vibration and noise in steel bridges. In this paper, the vibration response of an OSD with simply supported boundary conditions is calculated using the modal expansion method. The input mobility and insertion loss are selected as indices to evaluate the vibration response and suppression performance of the bridge. The results of calculations were compared with those of the finite element method to verify their accuracy. They showed that the input mobility of the OSD was affected primarily by the bending stiffness of the corresponding top plate and longitudinal ribs. The vibration energy of the OSD had both frequency-dependent and excitation location-dependent characteristics. When a source acted on the longitudinal rib or was close to it (within a distance of ¼ of the wavelength), the high-frequency vibration response of the OSD could still be greatly suppressed, with an average vibration reduction of approximately 15 dB. Reducing the spacing between the longitudinal ribs is one of the best ways to reduce the vibration response of the OSD. The frequency of the positive insertion loss ranged from 160 to 500 Hz when the longitudinal rib spacing was reduced from 0.8 to 0.4 m. The frequency-related vibration response of the OSD can be further reduced by adding transverse ribs, especially in the high-frequency range.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-20T09:47:06Z
      DOI: 10.1177/10775463211050718
       
  • Adaptive nonsingular integral-type dynamic terminal sliding mode
           synchronizer for disturbed nonlinear systems and its application to secure
           communication systems

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      Authors: Behrouz Vaseghi, Saleh Mobayen, Sami ud Din, Seyedeh Somayeh Hashemi, Mai The Vu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study proposes an adaptive nonsingular integral dynamic terminal sliding mode tracker/synchronizer for disturbed nonlinear systems along with its usage in safe communication systems. The convergence of the closed-loop structure under unknown uncertainty and disturbances is guaranteed via Lyapunov analysis. Furthermore, a parameter-tuning method is planned to approximate the upper bound of uncertainty and disturbance terms, since this latter is typically unknown in practice. The proposed approach is used to design a digital secure transmission scheme according to the chaotic systems. The effectiveness of the suggested approach is validated using computer simulations on a benchmark example of chaotic system. The obtained outcomes clearly confirm the ability of the planned control approach enables to attain the desired tracking/synchronizing performance despite the disturbances. Additionally, when implemented to the data encryption of a communication system, the proposed control and secure communication techniques enabled the complete and secure retrieval of the original digital sequences.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-19T03:29:57Z
      DOI: 10.1177/10775463221082714
       
  • Modeling and dynamic analysis for rotors with curvic-coupling looseness

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      Authors: Di Liu, Liang Zhou, Dayi Zhang, Hong Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The joint structures, such as flanges with bolts and curvic-couplings, are commonly applied in aero-engine rotors. Those joints tend to loosen when subjected to heavy load, and the local deformation of the joints can induce nonlinearities to the rotor and further affect its dynamic characteristics. However, much research focuses on the bolted joint loosening, while the studies of curvic-coupling loosening in rotor systems are seldom reported. In this paper, the modeling and dynamics analysis for rotors with curvic-coupling loosening are performed. First, an analytical model is proposed to describe the nonlinear stiffness caused by looseness at the joint interface. Then, a rotor with curvic-coupling looseness is modeled and the related dynamic equations are derived. Finally, the modal characteristics of the rotor with curvic-coupling looseness are analyzed based on the complex nonlinear modes method, and the rotor’s steady-state response is obtained using numerical methods. The results show that the softening behavior introduced by joint looseness can lead to eigen frequency reduction in modal analysis, amplitude jump in response, and bifurcation around the critical speed. The above dynamic characteristics can provide reference for fault diagnosis in the rotor system with curvic-coupling loosening.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-19T01:52:52Z
      DOI: 10.1177/10775463221074481
       
  • Global vibration control of nonlinear energy sinks

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      Authors: Guo-Xu Wang, Hu Ding, Li-Qun Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Although a linear vibration absorber (LVA) or nonlinear energy sink (NES) can effectively mitigate the vibration of a primary system in harmonic excitation, the amplitude of the absorber can be very large. Using the differential evolution algorithm, this paper pioneers the global control of the primary system and absorber to achieve decent vibration mitigation and decrease the global response. The results show that the maximum amplitude of the primary system and absorber can be controlled at the same level, and the global control strategy does not change the resonance frequency of the primary system. Compared with the LVA, the NES has similar vibration mitigation effects, mass ratio, and damping values. However, different from the LVA, the NES can achieve optimal mitigation effects in multiple optimal combinations of spring stiffness and geometry parameter and have smaller frequency responses in large excitation. Therefore, this paper proves the superiority of the NES in global vibration control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-18T05:28:40Z
      DOI: 10.1177/10775463221080350
       
  • Tunable band gaps of axially moving belt on periodic elastic foundation

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      Authors: Lei Lu, Fuyao Liu, Jihui Wu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The present paper investigates the band structure of an axially moving belt resting on a foundation with periodically varying stiffness. It is concluded that the band gaps appear when the divergence of the eigenvalue occurs and the veering phenomenon of mode shape begins. The bifurcation of eigenvalues and mode shape veering lead to wave attenuation. Hence, the boundary stiffness modulation can be designed to manipulate the band gap where the vibration is suppressed. The contribution of the system parameters to the band gaps has been obtained by applying the method of varying amplitudes. By tuning the stiffness, the desired band gap can be obtained and the vibration for specific parameters can be suppressed. The current study provides a technique to avoid vibration transmission of the axially moving material by designing the foundation stiffness.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-18T02:59:42Z
      DOI: 10.1177/10775463221083743
       
  • Continuous finite-time sliding mode control for synchronization of
           perturbed bistable electrostatic and piezoelectric transducers with
           external disturbances

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      Authors: Shitong Fang, Mohammad Javad Mirzaei, Mostafa Asadollahi, Keyu Chen, Wei-Hsin Liao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Despite that the synchronization of chaotic systems has been extensively investigated and demonstrated to contribute to physical, chemical, financial, and biological applications, the synchronization of different perturbed bistable systems appears to be an open issue. This is significant with the fact that the bistability widely exists from the visual perception to the electrical and mechanical systems. Therefore, this paper proposes a continuous finite-time terminal sliding mode control method to synchronize two bistable electromechanical transducers, with the electrostatic one acting as the master system and the piezoelectric one acting as the slave system. The model of two systems as well as the control method considering external disturbances and unmodeled dynamics are presented. Numerical simulation results show that two bistable systems can be synchronized with our proposed control method in intrawell, chaotic, and interwell oscillation modes. Furthermore, the chattering issue in conventional discontinuous controllers is eliminated with our designed continuous finite-time terminal protocols for bistable chaotic systems so as to improve the robustness of the controller and avoid its failure. Interesting findings are discussed for the varying system responses and control inputs in different oscillation modes. This work also is expected to facilitate the development of applications where bistability is found such as power or communication systems to resist the external disturbances.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-16T06:50:05Z
      DOI: 10.1177/10775463221080212
       
  • Proper location of the transducers for an active noise barrier

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      Authors: Shahin Sohrabi, Teresa Pàmies Gómez, Jordi Romeu Garbí
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The main intention of this study is to propose general criteria for the locations of the control sources and error microphones that improve the performance of the active noise barrier. Based on the proposed criteria of this study, the greater reduction is attained when the diffracted field of the noise source is canceled with the diffracted field of the control sources, that is, it is suggested to locate the control sources on the incident side and below the path that connects the furthest point in the shadow zone to the edge of the barrier. Furthermore, it is suggested that the error microphones are most suitably placed on the shadow side of the barrier where they are under the diffracted field of both the primary and control sources. The results also show that with these general criteria, the active noise control achieves an extra reduction that varies from 14.9 to 3.9 dB (for the one-third octave bands from 63 Hz to 1 kHz) and 9.3 dB for the broadband noises.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-16T03:19:22Z
      DOI: 10.1177/10775463221077490
       
  • Analysis and active control of torsional vibration in range extender with
           internal combustion engine

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      Authors: Dejian Meng, Hanyang Liu, Lijun Zhang, Jie Xu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The noise of extended-range electric vehicles is an industry concern, with the range extender providing the main noise source. Suppressing torsional vibration is important for reducing the noise of the range extender. A new combined model of system dynamics, generator control, range extender control, and active vibration control is proposed. The working state and torsional vibration characteristics of the model were analyzed under typical working conditions for the start, idling, stable operation, and stop stages. Under steady-state working conditions, for example, idling and stable operation stages, the torsional vibration of the range extender is mainly related to the excitation torque fluctuation of the engine, and when switching the operation stage (e.g., from idling to stable operation), it is mainly related to sudden changes in the generator and engine torque. An active vibration control model—including active torque composition controllers for engine torque fluctuation and switching the operation mode—is established. The simulation showed that active control effectively improved the torsional vibration and provided a new concept for controlling torsional vibration.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T12:35:59Z
      DOI: 10.1177/10775463221075119
       
  • Robust iterative learning control for linear discrete-time systems with
           initial state learning

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      Authors: Mojtaba Ayatinia, Mehdi Forouzanfar, Amin Ramezani
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates a new sufficient robust convergence condition of iterative learning control with initial state learning in the presence of iteration-varying uncertainty for multivariable systems in the time domain. The uncertainty in system parameters may lead to divergence of the ILC algorithm. Moreover, in the basic ILC algorithm, the initial state is constant in each iteration and, consequently, always leads to a tracking error. Providing fixed learning gains over time and iteration is a significant achievement of this norm-based method. For this purpose, first, a new robust convergence condition is designed based on the iterative learning control with initial state learning algorithm, and in the next step, a semi-optimal solution is achieved for it by the imperialist competitive algorithm . Finally, the effectiveness of the proposed convergence scheme is evaluated through two numerical examples.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T06:35:15Z
      DOI: 10.1177/10775463221075901
       
  • An improved fuzzy controller on electromechanical nano-tweezers

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      Authors: Ali Koochi, Masoud Goharimanesh, Mohammad Reza Gharib
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper aims to develop an improved fuzzy controller for position controlling of nano-wire-based electromechanical nano-tweezers. The nonlinear governing equation is developed by incorporating the Euler–Bernoulli beam model and Hamilton’s principle. Also, the quantum vacuum fluctuations are assimilated in the developed model in terms of Casimir attraction. The nonlinear constitutive equation is transformed into a nonlinear state-space form by employing the Galerkin method. Based on the linguistic explanation of the system, an improved fuzzy controller is designed to control the nano-tweezers for manipulating desired objects. The Taguchi technique has been used to decrease the number of independent experiments and improve the structure of membership functions, consequently. The designed controller is employed for both controlling and path tracking of nano-tweezers. The outcomes indicate that the proposed improved fuzzy controller has excellent performance for stabilizing the nano-tweezers at any desired gap.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T05:32:43Z
      DOI: 10.1177/10775463221083803
       
  • A sliding mode control strategy for active horizontal seat suspension
           under realistic input vibration

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      Authors: Igor Maciejewski, Andrzej Blazejewski, Sebastian Pecolt, Tomasz Krzyzynski
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In the paper, an innovative active control of a horizontal seat suspension system is discussed in context of realistic input vibration that occurs in the cabins of agricultural tractors. The vibration reduction system is represented by the state-space model and its numerical parameters are determined experimentally. For such a reliable mathematical representation of the system dynamics, the finite-time sliding mode controller is successfully designed for different spectral classes of the random excitation signal. A multi-objective control strategy is implemented in order to satisfy opposite requirements, that is, at the limited value of active force, a horizontal vibration of the seated human body is considerably reduced, but the suspension travel does not exceed unacceptable stroke of the system. Laboratory measurements of the seated human body have shown improved comfort of drivers under fore-and-aft vibrations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T05:17:32Z
      DOI: 10.1177/10775463221082716
       
  • Compound fault diagnosis of rolling bearing under variable speed based on
           generalized demodulation transformation and symplectic geometric mode
           decomposition

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      Authors: Ping Ma, Zhou Zhang, Hongli Zhang, Cong Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a superior compound fault diagnosis method of rolling bearing under a variable speed is proposed, which is based on the generalized demodulation transformation and symplectic geometric mode decomposition. First, generalized demodulation transformation is performed on a time-varying non-stationarity compound fault signal to smooth the fault components by calculating the characteristic frequency, phase function, and theoretical fault frequency point. Then, a new signal decomposition method is applied to extract component signals of different frequencies from the smoothed fault components, and the frequency of each extracted component signal is obtained. Finally, the frequencies of the obtained fault components are compared with theoretical fault frequencies to perform decoupling and diagnosis of compound fault. The simulation and experimental analysis results show that the proposed method can effectively decouple different fault components of compound fault without using the order tracking, providing a superior solution for the diagnosis of compound fault under a time-varying rotational speed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T04:17:34Z
      DOI: 10.1177/10775463221082924
       
  • Selective layer-by-layer fillering and its effect on the dynamic response
           of laminated composite plates using higher-order theory

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      Authors: Sarada Prasad Parida, Pankaj Charan Jena
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this work, a fifth-order shear deformation theory is computed using the layer-wise model to determine non-dimensional fundamental frequencies. The theoretical, experimental, and finite element analysis (FEA) results are compared for a standard isotropic material. Hand layup technique is used to prepare glass fiber reinforced polymer composites (GFRPC) with selective layers filled with graphene and flyash. This technique helps to reduce the fabrication cost as the whole structure is not to be strengthened by the fillers. Six classes of the laminated-composite-plate (LCP) such as outer layer graphenated LCP (O-LCP), core layer graphenated LCP(C-LCP), functionally graded LCP (FG-LCP), LCPs only rich in graphene (G-LCP), LCPs only rich in flyash (F-LCP) along with a neat epoxy-glass LCP (N-LCP) are fabricated. A low-cost frequency measurement module is set-up to measure the fundamental frequency (FF) of the fabricated LCPs. FFs, amplitudes, non-dimensional stress parameters, and central deflection of the LCPs under harmonic load, the buckling strength, and displacements of the LCPs are calculated. It is found that harmonically excited C-LCP and O-LCP have better stability accompanied by lower deflections, followed by G-LCP as compared to other kinds of LCPs. Also, the addition of graphene increases the buckling strength of LCPs, which portrays that the local layer filling is a useful technique to enhance the strength of the LCPs.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-15T02:08:44Z
      DOI: 10.1177/10775463221081180
       
  • Stiffness design and multi-objective optimization of machine tool
           structure based on biological inspiration

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      Authors: Yanpeng Hao, Lida Zhu, Boling Yan, Tianyu Ren, Jinze Zhao, Xuefeng Ning, Hao Lu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper proposes a novel method to design the internal stiffeners layout of the supporting parts of a machine tool. This method skillfully adopts the natural growth law of leaf veins. Firstly, the similarity between the growth law of leaf veins and the layout of stiffeners in the supporting parts is dealt with in detail. The mechanical properties of different growth types of leaf veins are compared and analyzed by the finite element simulation. In addition, the optimality of the adaptive growth law of leaf veins is also analyzed. Then, a parameter optimization method of stiffeners layout based on a variable cross-section structure is proposed. Distinct from the traditional design of stiffeners layout, the method proposed in this paper not only adopts the idea of a variable cross-section structure, but also simulates the adaptive growth law of leaf veins through a parametric method. In the process of establishing a meta model, three modeling methods are compared, and the excellent performance of the genetic algorithm and BP neural network (GABPNN) method in meta model accuracy is determined. And a marine predator algorithm is implemented to optimize the meta model. Finally, the method proposed in this paper is applied to the design of the column part of a machine tool, and the effectiveness of the proposed method is verified by simulation and experiments, which provides a good idea for the design of stiffeners layout of the supporting parts of a machine tool.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-12T05:51:20Z
      DOI: 10.1177/10775463221085858
       
  • Output feedback robust H∞ control for uncertain descriptor fractional
           order systems with 0 < α < 1

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      Authors: Xuefeng Zhang, Jie Ai
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Novel criteria of the bounded real lemma corresponding to H∞ norm of descriptor fractional order systems with 0 < α < 1 are studied. The conditions are presented in terms of strict linear matrix inequalities , which contain real decision variables of linear matrix inequalities instead of complex decision variables. Based on the new bounded real lemma, output feedback robust H∞ control for uncertain DFOS with norm bounded is studied for the first time. Different from the existing results, the presented results are more convenient to design controllers and are directly solved by any linear matrix inequality toolbox. Finally, three examples are proposed to verify the validity of conclusions.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-11T07:01:42Z
      DOI: 10.1177/10775463221083742
       
  • Corrigendum

    • Free pre-print version: Loading...

      Abstract: Journal of Vibration and Control, Ahead of Print.

      Citation: Journal of Vibration and Control
      PubDate: 2022-04-11T05:53:07Z
      DOI: 10.1177/10775463221082424
       
  • Robust flight control for a quadrotor under external disturbances based on
           predefined-time terminal sliding mode manifold

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      Authors: Moussa Labbadi, Kamal Elyaalaoui, Mohamed Amine Dabachi, Soufian Lakrit, Mohamed Djemai, Mohamed Cherkaoui
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper investigates the terminal sliding-mode control (TSMC) with predefined-time stability (PTS) for a disturbed quadrotor system (DQS). First, for both the rotational and translational subsystems of the DQS, a novel notion of predefined-time terminal sliding-mode manifold (PTTSMM) is created. Using the proposed PTTSMM method, the DQS state variables reach their origin in a predefined-time. The influence of disturbances is taken into consideration in the design of the suggested control to show its performance. A formal analysis technique is also provided, as well as the stability of the closed-loop DQS. The performance and effectiveness of the predefined-time method proposed in this work are illustrated by numerical simulations and also comparison study with other control techniques is presented.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-11T05:39:58Z
      DOI: 10.1177/10775463221074098
       
  • Robust tracking control design with a novel leakage-type adaptive
           mechanism for an uncertain lower limb exoskeleton robot

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      Authors: Siyang Yang, Jiufang Pei, Youyu Liu, Ye-Hwa Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a novel adaptive robust control approach has been proposed for a class of uncertain mechanical systems. First, aiming for the unknown uncertainties which may be fast time-varying, a novel adaptive mechanism in leakage-type will be developed. Unlike the prevalent adaptive methods, this adaptive mechanism put forward mainly accounts for estimating all the lumped uncertainty terms, and does not require any information of uncertainties other than they are bounded; Second, through transforming the gait following assignment to the constraint control, an adaptive robust constraint-following controller constructed will render the constraints uniformly bounded and uniformly ultimately bounded. To testify the efficacy of proposed approach, a lower limb exoskeleton robot is considered as an illustrative example, the simulations indicate that the proposed control can indeed improve the level of passive rehabilitation training.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-08T04:26:51Z
      DOI: 10.1177/10775463221084401
       
  • An approach to solve fractional optimal control problems via
           fractional-order Boubaker wavelets

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      Authors: Kobra Rabiei, Mohsen Razzaghi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This work is devoted to numerical solution to solve fractional optimal control problems (FOCPs). The fractional-order Boubaker wavelets (FOBWs) are introduced. By applying hypergeometric functions, an exact formula for Riemann–Liouville fractional integral operator for FOBW is obtained. By using this formula, the FOCP is reduced into a corresponding optimization problem which can be solved by applying the Lagrange multiplier method. Also, the convergence for the present method is provided. Seven numerical examples are included to demonstrate the applicability of the proposed technique. In Example 6, it will be shown that we can achieve the exact solutions which were not obtained previously in the literature. In addition, in Example 7, a practical example in a cancer model is provided.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-05T09:02:31Z
      DOI: 10.1177/10775463211070902
       
  • Dynamic behavior of heterogeneous neo-Hookean/Mooney–Rivlin plates
           reinforced nonuniformly by hyperelastic inclusions: Proposing the correct
           micromechanical model

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      Authors: Mohammad Shariyat, Hamed Khani Arani
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Time-dependent nonlinear lateral vibrations of plates composed of a hyperelastic matrix and uniformly/nonuniformly distributed hyperelastic reinforcing inclusions are studied. Since the material constants of a hyperelastic must be extracted from the whole slope-varying stress-strain curve rather than a single slope, choosing power/exponential distributions for the material constants or using Voigt’s rule of mixtures is quite wrong. The neo-Hookean and Mooney–Rivlin constitutive models are adopted, and their results are compared. Another hint is incorporating the incompressibility condition. The governing equations of motion are derived by using Hamilton’s principle, a new energy-equivalence-based micromechanical model that can be employed for reinforcing phases with nonlinear constitutive laws, and von Kármán assumptions in the left Cauchy–Green deformation tensor, and solved by incorporation of an updating finite-element and Newmark’s techniques. Not only the displacement but typical stress results are also reported here. Results show that the neo-Hookean model overestimates the rigidity in comparison to the Mooney–Rivlin model, and unlike the elastic plates, the effect of the stiffer phase is more remarkable in the uniform distribution in comparison to the nonuniform distribution of the stiffening materials because the magnitudes of the tensile stresses of the hyperelastic plate are much larger than that of the bending stresses.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-01T11:42:02Z
      DOI: 10.1177/10775463211067300
       
  • Proportional-integral-derivative-acceleration robust controllers for
           vibrating systems

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      Authors: Danielle S Gontijo, José M Araújo, Tito LM Santos, Fernando O Souza
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper presents a design framework to obtain a robust multivariable Proportional-Integral-Derivative (PID) controller for second-order linear vibrating systems. A Proportional-Integral-Derivative plus acceleration (PIDA) controller is also proposed to deal with the regularization problem. Relevant control challenges, such as modeling error, regulatory performance optimization, regional pole placement, saturation avoidance, and constant reference tracking are handled within the proposed Linear Matrix Inequality (LMI) design approach. The design strategy is obtained from a linear transformation that can be applied to achieve constant reference tracking for an actuated subspace of underactuated systems. Moreover, the integral action has two additional objectives: (1) to improve regulatory performance in the presence of constant disturbance and (2) to increase the design degree of freedom in order to robustly achieve closed-loop specifications. Three simulation case studies are used to highlight the benefits of the PID and PIDA controllers.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-01T07:22:57Z
      DOI: 10.1177/10775463211060898
       
  • Optimal robust constraints-following control for rail vehicle virtual
           coupling

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      Authors: Xinrong Zhang, Dengke Yang, Wei Zhang, Jin Huang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper puts forward the robust control problem of rail vehicle virtual coupling platoon that is subject to nonlinear and time-varying uncertainties. The uncertainties are caused by external disturbances and parameter variations. To this end, this paper designs a robust controller based on the Udwadia-Kalaba (UK) equation. First, we introduce the concept of virtual coupling and establish the longitudinal dynamics model of the rail vehicle. In order to ensure the control objective of the virtual coupling process, the spatial constraint on position and bidirectional inequality constraints for the spacing error between the marshalling trains are established. After changing the bounded state into the unbounded state through the state transformation, the UK approach can be used. Then, the constraint-following robust controller design is based on the UK approach and Lyapunov stability theory. The controller can render the unbounded state eventual uniform boundedness and uniform ultimate boundedness, which also satisfies the spatial constraint and the bidirectional restriction for the spacing error. Moreover, an optimized design scheme for the tunable parameter of this controller is proposed, which minimizes the control cost and comprehensive index of system performance. Finally, numerical simulations are given to illustrate the effectiveness of the proposed methods.
      Citation: Journal of Vibration and Control
      PubDate: 2022-04-01T02:16:02Z
      DOI: 10.1177/10775463211062333
       
  • A review on various configurations of the passive tuned liquid damper

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      Authors: Tanmoy Konar, Aparna (Dey) Ghosh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Passive tuned liquid dampers, being cost-effective, easy to implement, and reliable structural vibration control devices, have received significant attention from designers and researchers. Considerable works devoted to the extraction of higher damping, increase in volumetric efficiency, improvement in architectural adaptability, and use in a large spectrum of structures have led to the development of a variety of configurations of passive tuned liquid dampers. Rigorous research efforts are being devoted to the utilization of different forms of tuned liquid dampers for the vibration control of buildings, bridges, chimneys, wind turbines, etc. However, till now, only a few varieties of tuned liquid dampers have been implemented in real-life structures, while the others require further refinement. This necessitates the present work, through which a systematic review on tuned liquid dampers of various configurations for structural response reduction is presented, with a focus on the design of the dampers. To organize the review in a structured manner, the large family of tuned liquid dampers is categorized into five groups based on their energy dissipation mechanism, namely the tuned sloshing damper, tuned liquid column damper, combined tuned sloshing damper-tuned liquid column damper system, compliant liquid damper, and liquid damper with submerged tuned oscillator. The modeling, analysis, design, and performance-related aspects of the different varieties of tuned liquid dampers are covered. The advantages and applicability of the different types of tuned liquid dampers are highlighted along with their real-life installations. The current gaps in the development of the various tuned liquid damper configurations and scope of future developments are also identified.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-29T01:23:46Z
      DOI: 10.1177/10775463221074077
       
  • Enhanced design of the quasi-zero stiffness vibration isolator with three
           pairs of oblique springs: Theory and experiment

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      Authors: Feng Zhao, Shuqian Cao, Quantian Luo, Jinchen Ji
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Quasi-zero stiffness vibration isolators have been extensively studied due to superior passive vibration isolation performance. As the quasi-zero stiffness region of the isolators is generally small, the research on their responses to the excitation with high amplitude is currently quite limited. This paper presents an improved design of the quasi-zero stiffness isolator with three pairs of oblique springs to increase the amplitude of the excitation. Theoretical formulations are derived for stiffness and force, and then the influences of three independent parameters on the quasi-zero stiffness region are studied to obtain optimal design parameters. A prototype is fabricated and tested for displacement excitations with amplitudes of 5 mm, 10 mm, and 15 mm in a frequency range of 1.5–10 Hz. The absolute displacement transmissibility of the enhanced quasi-zero stiffness isolator is theoretically and experimentally compared with that of the corresponding linear isolator and that of the previous isolators with three pairs of oblique springs using the same parameter conditions of the loaded mass, the horizontal length of oblique springs, and the vertical spring. The experimental results show that the enhanced design of the quasi-zero stiffness isolator with three pairs of oblique springs can achieve lower displacement transmissibility and deal with the displacement excitation with higher amplitude.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-27T05:07:08Z
      DOI: 10.1177/10775463221074143
       
  • Investigation of the effect of vibration-reducing tracks on the vibration
           and noise from a large-span steel bridge

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      Authors: Lin Liang, Xiaozhen Li, Ran Bi, Zhenhua Gong, Yadai Sun
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The vibration and noise problem of large-span steel bridge in urban rail transit have received increasing attention in recent years. As a common vibration control measure, the vibration-reducing track has been widely used on concrete bridges. However, systematic research on the vibration and noise reduction characteristics of large-span steel bridge by using vibration-reduction track remains insufficient. At the present paper, the vibration and noise reduction mechanism and characteristics of three typical vibration-reducing tracks, which are applied on large-span steel bridge, are studied. Firstly, based on the vehicle, track, and bridge coupling theory, a theoretical analysis model in the frequency domain was established. The dynamic receptance, wheel-rail force, force transmissibility ratio, and force transmitted to the bridge can be obtained, which are used to analyze the vibration-reduction mechanism of each vibration-reducing track. Then, the vibration and noise prediction model of a large-span steel-truss cable-stayed bridge is established by plate-beam combined finite element method and statistical energy method, and verified though the measured results. Finally, the vibration and noise reduction characteristics and effects of large-span steel bridge under the three vibration-reducing tracks are analyzed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-27T04:47:40Z
      DOI: 10.1177/10775463221075403
       
  • Research on the resonance frequency splitting mechanism and novel modal
           characteristics of a rotating tire acoustic cavity

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      Authors: Xiandong Liu, Wei Zhao, Xiaojun Hu, Yingchun Shan, Tian He
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Tire acoustic cavity resonance (TACR) noise contributes significantly to interior noise for lower powertrain noise passenger cars and electric cars, which affects the ride comfort obviously. To design sound absorption structures effectively, it is crucial to clarify the evolution mechanism and influence factors of the resonance frequencies and acoustic modal shapes with the running speed. Aiming at these problems, in this paper, a theoretical model of sound wave propagation in a tire acoustic cavity is constructed based on the superposition principle of traveling waves, and the sound field distributions under different rotating speeds are investigated. The formation conditions of TACR are summarized from the perspective of wavenumber. Especially for a rotating tire acoustic cavity, some novel modal characteristics, such as the novel deflective modal shapes and the continuously changing phase, are found. And the theoretical calculation results are verified by the experiment and simulation. The significance of this work is that the evolution mechanisms of TACR frequency and modal shape with the tire rotating speed are theoretically clarified and revealed, which are helpful to obtain effective solutions to suppress TACR noise.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-26T12:36:07Z
      DOI: 10.1177/10775463221075401
       
  • Fast fixed-time sliding mode control for synchronization of chaotic
           systems with unmodeled dynamics and disturbance; applied to
           memristor-based oscillator

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      Authors: Mohammad Javad Mirzaei, Ehsan Aslmostafa, Mostafa Asadollahi, Naser Padar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, fast global fixed-time terminal sliding mode control for the synchronization problem of a generalized class of nonlinear perturbed chaotic systems has been investigated with the application of memristor-based oscillator in the presence of external disturbances and unmodeled dynamics. In the fixed-time control strategy, unlike conventional asymptotic or finite-time approaches, convergence time is not related to the initial conditions. In the designed global fixed-time controller, both the sliding phase and reaching phase have fixed-time convergence characteristics and consequently, via the proposed strategy, precise synchronization of the master-slave systems is accomplished within fixed convergence time. The fast fixed-time synchronization problem of the nonlinear memristor chaotic system (MCS) has been investigated. In the first stage, an in-circuit emulator (ICE) for the considered memristor is utilized in order to apply on the defined MCSs. In the next stage, according to the considered ICE, the dynamical structure of the MCS is formulated along with the fixed-time synchronization problem which is efficiently addressed via the designed controller in the presence of external disturbances and unmodeled dynamics. Finally, the strength and validity of the theoretical outcomes are confirmed through numerical simulations.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-26T10:36:22Z
      DOI: 10.1177/10775463221075116
       
  • Free vibration analyses of functionally graded plates based on improved
           refined shear and normal deformation theory considering thickness
           stretching effect using Airy stress function

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      Authors: Leila Monajati, Navid Farid, Mehrdad Farid, Hassan Parandvar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, an improved refined shear and normal deformation theory is used in order to investigate the vibration behavior of functionally graded rectangular plates. In this theory, displacements of various points of plate are assumed to be due to in-plane displacements of the middle plane and transverse displacement. Transverse displacement is divided into three parts: bending, shear, and thickness stretching. Using the Airy stress function, corresponding to the compatibility equation, and employing the extended Hamilton’s principle, in-plane displacements are omitted from the equations of motions. Thus, the proposed approach uses only three-unknowns in the displacement field. The results of vibration analysis using the proposed approach are in excellent agreement with three-dimensional and quasi-three-dimensional solutions containing a greater number of unknowns to consider the thickness stretching effect. Static and dynamic behavior of wide variety of thin and thick functionally graded plates can be studied using the proposed approach in which not only the number of variables is reduced, but also the contribution of bending, shear, and thickness stretching are completely clarified.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-26T09:58:47Z
      DOI: 10.1177/10775463221078658
       
  • Non-linear vibration of delaminated composite beam with two overlapping
           delaminations

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      Authors: Sajjad Karimi, Ali Amin Yazdi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The main aim of this paper is to study the non-linear vibration of a delaminated cross-ply composite beam with two overlapping delaminations. The effect of geometrical non-linearity and large deflection on the axial forces due to the existence of two overlapping delaminations are considered. The unknown axial forces created due to the delaminations are obtained by changing the length of the delaminated segments during the vibration behavior. The homotopy perturbation method (HPM) is utilized to obtain the frequency ratio of the delaminated cross-ply composite beam with two overlapping delaminations. This study describes the effects of different parameters such as two delaminations total length, overlap distance, and the distance between center points of two delaminations in axial and thickness directions on the frequency ratio of the delaminated composite beam in detail.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-26T08:45:37Z
      DOI: 10.1177/10775463221076336
       
  • Event-based fast terminal sliding mode control design for a class of
           uncertain nonlinear systems with input delay: A quantized feedback control
           

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      Authors: Mobin Saeedi, Jafar Zarei, Roozbeh Razavi-Far, Mehrdad Saif
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper deals with the problem of regulation and tracking tasks for nonlinear dynamic systems that use a network medium to transmit state measurements. A novel quantized event-triggered fast terminal sliding mode controller (SMC) is proposed to reduce communication resources and computation loads while increase robustness against packet dropout, uncertainties, and disturbances. Then, new criteria are defined for the dynamic quantizer based on the event-triggering error, which increases the accuracy and facilitates the implementation procedures. In practice, delay-free systems are not realistic considerations, thus, their stability is analyzed in the presence of a dynamic quantizer and input delay under the proposed controller scheme. Then, the minimum inter-sampling time is derived, which guarantees the Zeno-free behavior and provides information about the cyber layer bandwidth in cyber-physical systems. Finally, three simulations on an unstable numerical model, the model of an inertia wheel inverted pendulum, and the mass-spring-damper model validate the effectiveness of the proposed methodology.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-26T06:09:09Z
      DOI: 10.1177/10775463211070901
       
  • Application of asymmetric barrier Lyapunov function using ADRC approach
           for development of autonomous vehicle lateral control

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      Authors: Aman Parkash, Akhilesh Swarup
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper presents a control scheme for performance improvement in lane-keeping activity of autonomous vehicle, within guaranteed specified deviations. Such feature will provide better and safe maneuvering for autonomous vehicle. The proposed control scheme consists of Asymmetric Barrier Lyapunov Function (ABLF) based backstepping method for ensuring stability and constraints satisfaction. Since autonomous vehicle dynamics is subjected to unknown disturbances and also the states, it has been shown that the vehicle performance can be improved by the application of Active Disturbance Rejection Control (ADRC) which uses the Extended State Observer (ESO). For the proposed control scheme, the asymptotic stability and convergence of error dynamics have been established. The simulation results have been presented to illustrate the performance robustness and accuracy provided by the proposed control scheme. Further, it has been show that the vehicle motion performance is better in comparison to the performances obtained from two existing control methods.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-25T11:50:20Z
      DOI: 10.1177/10775463221075443
       
  • Study of the multi-excitation decoupling optimization method for the
           integrated structure of a high-resolution optical satellite

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      Authors: Lin Yang, Yan-song Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the sensitive frequency band for distortion and blurring phenomena of the in-orbit satellite is studied and the results are supplements for existing studies and can provide an important reference for the study of micro-vibration. To contain the large-amplitude and micro-vibration excitation response in this sensitive frequency band, a multi-excitation decoupling optimization method is proposed for the integrated structure of high-resolution optical satellites. First, the equivalent dynamics models of the satellite with and without an vibration isolator are established. By deriving the functional relationship between satellite bus stiffness, vibration isolator stiffness, and vibration isolation efficiency, the design objectives can be decoupled and assigned to the vibration isolator and satellite bus in a more cost-effective way, respectively, while maintaining a low computation volume of the multi-objective and multi-variable system optimization. Then, the satellite system is optimized with the objectives of minimizing the large-amplitude vibration response in the launch phase and the micro-vibration response in the orbital operation phase using the NSGA-II genetic algorithm. Finally, the design is verified by ground experiments that it can fully achieve required technical parameters under multiple vibration excitations. This method has certain reference value for the design of complex structural systems of high-resolution satellites.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-25T11:20:26Z
      DOI: 10.1177/10775463221074479
       
  • Development and performance evaluation of an electromagnetic transducer
           with a tuned variable inerter

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      Authors: Minoru Takino, Takehiko Asai
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper proposes a novel vibration energy harvesting device employing a tuned variable inerter. The inerter is a device that can produce an amplified inertial mass effect by ball screw or rack and pinion mechanisms. Originally, the inerter was developed for suspensions in automobiles, and various kinds of inerter technologies have been widely studied not only in structural control but also in energy harvesting so far. As an example of such devices, the tuned inertial mass electromagnetic transducer has been proposed, and its effectiveness as an energy harvesting device has been shown already. However, at the same time, previous studies suggested that further performance improvement is possible if the inerter is variable according to changes in disturbance conditions. Thus, in this research, a prototype which can change the value of the inerter is designed, and a system to change the inerter based on the dominant frequency detected online by the fast Fourier transform of the measured data is developed. Then, it is shown through experimental studies that the proposed device can improve the energy harvesting performance compared to the existing tuned inertial mass electromagnetic transducer for disturbances with varying dominant frequencies.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-25T10:42:12Z
      DOI: 10.1177/10775463221074078
       
  • An enhanced adaptive-LQR procedure for under-actuated systems using
           relative-rate feedback to dynamically reconfigure the
           state-weighting-factors

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      Authors: Omer Saleem
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper synthesizes an innovative nonlinear-type self-adaptive Linear Quadratic Regulator (LQR) to enhance the robustness of under-actuated systems against bounded exogenous disturbances by using the relative-rate and state-error feedback. The control procedure is realized by augmenting the generic LQR with an online reconfiguration block that acts as a superior regulator to dynamically adjust the state-weighting-factors associated with the quadratic-performance index. The Riccati Equation uses the modified state-weighting-factors to re-compute the LQR problem and delivers the time-varying state-feedback gains. The said weighting-factors are adaptively modulated via a conventional state-error-magnitude-driven adaptation law that is retrofitted with auxiliary relative-rate-driven reconfiguration blocks. These blocks utilize error acceleration to deduce the response speed and thus re-adjust the variation rate of the weights in real time. This arrangement reinforces the controller’s adaptability to flexibly manipulate the tightness of the applied control effort. The proposed scheme is analyzed by conducting real-time hardware experiments on the QNET Rotary Pendulum. The experimental outcomes validate the superior position-regulation and disturbance-rejection behavior of the proposed scheme.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-25T02:46:27Z
      DOI: 10.1177/10775463221078654
       
  • Adaptive output regulation of the adaptive optics system

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      Authors: Berk Altıner, Mustafa Doğan, Janset Daşdemir
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Deformable mirrors are very efficient optical devices that are used in correcting wavefront aberrations and are core elements of adaptive optics systems. Its promising success allows it to operate in a large field of applications. Hence, one of the most important problems in the control of adaptive optics systems is to design a controller that can achieve perfect wavefront correction in completely unknown environmental conditions. To achieve this goal, this study proposes an adaptive internal model control design for deformable mirrors. Considering deformable mirrors as a flexible plate equation, an adaptive internal model-based controller is designed and the effectiveness of the proposed method despite abrupt changes in disturbance is proven by simulation results.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-25T02:20:12Z
      DOI: 10.1177/10775463211056833
       
  • Weak fault detection of rolling element bearing combining robust EMD with
           adaptive maximum second-order cyclostationarity blind deconvolution

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      Authors: Lianhui Jia, HongChao Wang, Lijie Jiang, WenLiao Du
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To solve the difficulty in weak fault detection of rolling element bearing (REB), a fusion method by combining robust empirical mode decomposition (REMD) with adaptive maximum second-order cyclostationarity blind deconvolution (AMCBD) is proposed in the paper. The advantage of REMD in determining the optimal iteration number of a sifting process and the advantage of AMCBD in setting the key parameter (targeted cyclic frequency or fault period) appropriately are utilized comprehensively by the proposed method. Firstly, in view of the multi-component and modulation characteristic of the vibration signal of REB, REMD is used to extract the useful component from the multi-component and modulated signal. Then, AMCBD is used to process the selected useful component to further highlight the cyclostationary and impulse characteristics of the vibration signal of faulty REB. Compared with traditional maximum second-order cyclostationarity blind deconvolution (MCBD) method, AMCBD has the advantage of no needing prior knowledge of the faulty REB such as the targeted cyclic frequency or fault period. At last, envelope spectral (ES) is applied on the signal handled by AMCBD and satisfactory fault extraction feature result is obtained. Effectiveness of the proposed method is verified through simulated, experimental, and engineering signals, and its superiority is also presented through comparison study.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-24T07:49:15Z
      DOI: 10.1177/10775463221080229
       
  • Prediction of sound transmission loss of conical acoustic enclosure using
           statistical energy analysis and its experimental validation

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      Authors: Pavan Gupta, Anand Parey
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The conical shape structures are widely employed in many practical applications such as aircraft, rockets, tanks, and submarines. Prediction of sound transmission loss is often required at the design and evaluation stages of such structures. In this paper, an analytical model is proposed using the statistical energy analysis (SEA) technique to predict the sound transmission loss of a conical shape acoustic enclosure in a broad frequency range. The proposed model is verified experimentally using the sound intensity experimental technique. It was found that the analytical predictions are in good agreement with the measured transmission loss, specifically at the ring and critical frequencies. The percentage error between predicted and measured lower ring frequency is 5.1% and that for the upper ring frequency is 0.4%. The percentage error between predicted and measured critical frequency is 2.7%. The results obtained indicate that the developed analytical model can be used as an efficient design tool to predict the acoustic performance of conical shape structures.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-24T07:38:23Z
      DOI: 10.1177/10775463221076665
       
  • Topological design of 2D periodic structures for anti-plane waves based on
           deep learning

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      Authors: Chen-Xu Liu, Gui-Lan Yu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A deep learning model is proposed to realize the topological design of 2D periodic structures for anti-plane waves. The influence of site conditions, namely soil parameters, on the design, is considered. The model is composed of a variational autoencoder (VAE) and an autoencoder (AE) with a pretrained decoder. Two types of datasets, Image Dataset and Physics Dataset, are used to train the VAE and the AE’s decoder, respectively. A large number of numerical simulations are performed to prove the reliability of the deep learning model designing topological configurations, and the correlation coefficient between the targeted and designed bandgaps reaches 0.998. Designs under different site conditions from soft soil to hard soil are realized satisfactorily by the proposed model, and multiple topological configurations are given for the same target under the same site condition, revealing the “one-to-many” nature of the design problem. The results show that the proposed deep learning model is smart, efficient, precise, stable, and universal.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-24T04:41:41Z
      DOI: 10.1177/10775463211048976
       
  • Three-dimensional dynamic modeling and simulation of a multi-cable winding
           hoister system considering bidirectional coupling between cage and
           flexible guides

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      Authors: Yangjun Pi, Jian Zhang, Xiaobin Tang, Jiahao Zhu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A comprehensive three-dimensional dynamic model of a multi-cable double-drum winding hoister with flexible guides is presented, as the existing models cannot deal with the three-dimensional eccentricity of the cage and out-of-plane excitation generated by rotational drums. The entire system consists of three subsystems: cable subsystem, cage subsystem, and guide subsystem, respectively. Displacement and force boundary conditions are employed to couple those subsystems, and the interaction between cage and guides is considered as bidirectional coupling. The dynamic models of the three subsystems are established by Hamilton principle and Newton-Euler equation in a three-dimensional space independently. The dynamic model is discretized and solved by the Galerkin method and Runge–Kutta method. The three-dimensional displacement excitations and three-dimensional eccentricity can be handled in this dynamic model. The differences between two-dimensional dynamic model and three-dimensional dynamic model are discussed and the mechanism of entire system vibration are also analyzed by numerical simulation with typical unbalance factors, the cage eccentricity. The results show that the proposed three-dimensional dynamic model is more accurate in some realistic cases, existing out-of-plane excitation or three-dimensional eccentricity of the cage.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-23T08:27:57Z
      DOI: 10.1177/10775463211068901
       
  • A discrete output feedback 2-SMC using Linear Matrix Inequalities and
           adaptive switching gain approaches: Real application on a chemical reactor
           

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      Authors: Khadija Dehri, Anis Messaoud, Ridha Ben Abdennour
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The chattering phenomenon is one of the most pervasive problems in sliding mode control (SMC), especially for discrete time applications. In this paper, we propose a new discrete output feedback second order sliding mode control (DOF2SMC). The design of this controller is based on the Linear Matrix Inequalities (LMI) approach. Then, an adaptive switching gain (ASG) is incorporated into the discontinuous part of the controller to obtain good closed loop performance in terms of tracking and reducing chattering in the case of systems subject to internal and external disturbances.Simulation results of a steer-by-wire (SBW) system show the effectiveness of the proposed DOF2SMC with ASG.To validate, once again, the performance of the proposed control system, an experimental validation on a transesterification reactor is presented. The obtained results show good closed loop performance.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-23T07:52:13Z
      DOI: 10.1177/10775463221075113
       
  • Active crack control approach applied to a horizontal rotating machine

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      Authors: Leandro de S Leão, Iago A Pereira, Felipe C Carvalho, Aldemir A Cavalini, Valder Steffen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The present contribution proposes an active vibration control technique devoted to shafts with cracks aiming to minimize their propagation. The existence of a crack in rotating shafts can be characterized by 2X and 3X super-harmonic amplitudes in the vibration responses of the rotor, which can increase as the crack propagates along the shaft’s cross-section. A proportional-integral-derivative control technique is applied to suppress the 2X and 3X vibration amplitudes of a cracked shaft, which is performed by using a bandpass filter applied to the vibration responses of the rotor. Numerical and experimental results are obtained through both a representative finite element model of a horizontal rotor and its corresponding test-rig. In this case, electromagnetic actuators are used to apply the control effort to the rotor. The Mayes model is applied for simulating the breathing behavior of the transverse crack. The linear fracture mechanics theory is considered to correlate the crack depth with the corresponding additional rotor flexibility. Both numerical and experimental results demonstrate the possibility of reducing the effects of a transverse crack through active control on the dynamic behavior of a rotating machine. Moreover, it is shown that the proposed control law is capable of controlling the crack effects with the rotor operating in different rotation speeds.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-23T06:28:24Z
      DOI: 10.1177/10775463221080230
       
  • A semi-active control algorithm for nonlinear structures based on uniform
           distribution of deformation theory

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      Authors: Reza Karami Mohammadi, Hadi Ghamari, Sina Zolfagharysaravi
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Semi-active control is a promising method for vibration control of civil structures. Magneto-rheological (MR) damper is one of the most common and practical devices among other semi-active control devices. The command voltage is the only controllable property of an MR damper. There are several algorithms for determining the MR damper command voltage such as active control-based algorithms. On active-based algorithms, an initial reference control force is achieved based on a reference active control algorithm, then this force converts to applied voltage. Uniform Distribution of Deformations (UDD) theory is a concept which intends to use the maximum capacity of elemental and structural ductility. When deformations are uniform throughout the entire structure, damages are mostly uniform and the maximum of damage is reduced. This point can be used for designing a new active-based semi-active algorithm. The innovative Uniform Deformation Control (UDC) is an active-based control algorithm. Reference active control forces are achieved using a massless Virtual Added frame with Pinned connections (VAP). This virtual frame makes deformation of the structure more uniform. The axial forces of the VAP beams are the reference active control forces. Afterward, based on these forces, the command voltages of semi-active MR damper are determined. The VAP characteristics are optimized using Charged System Search (CSS) optimization method for making the structural deformations more uniform. Therefore, this new innovative proposed algorithm focuses on reducing damages contrary to common algorithms which focus on reducing responses. The contribution of the present paper is to introduce the new damage-based algorithm. Then, this algorithm will be investigated in comparison with two other common algorithms. The effectiveness of the new proposed algorithm is proved via nonlinear numerical investigations on an office building. The new algorithm can reduce displacements and accelerations with relatively low control forces while making deformations more uniform.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-22T08:53:41Z
      DOI: 10.1177/10775463211051149
       
  • Robust event-triggered finite-time control of faulty networked flexible
           manipulator under external disturbance

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      Authors: Farzaneh Jani, Farzad Hashemzadeh, Mahdi Baradarannia, Hamed Kharrati
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, finite-time contractive stability analysis and observer-based H∞ fault tolerant control problem is discussed for a networked single-link flexible manipulator subject to external disturbance, actuator, and sensor faults. The variable delay is considered in both sensor-to-controller and controller-to-actuator channels. In order to conserve the network resources and avoid Zeno phenomenon, the sampled-data-based event-triggered scheme is employed, which only requires the system states in discrete instants. The nonlinear unknown input observer is first designed to achieve the estimation of the system states and faults simultaneously. To reduce the conservatism of designing procedure, the Lyapunov–Krasovskii functional approach is used, which includes the information of the lower and upper bounds of variable data transmission delay. Then, sufficient delay dependent conditions are derived and an observer-based feedback control law and observer gains are computed by a set of linear matrix inequalities to realize that the augmented system is finite-time contractive stable and the states of the system remain within a specified threshold during a fixed time interval, which is smaller than the initial state bound. Furthermore, the prescribed H∞ performance is satisfied in the presence of external disturbance. At last, simulation results are given to confirm the validity of the presented approach.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-16T08:23:09Z
      DOI: 10.1177/10775463211047035
       
  • Time-delay estimation based dual model-free control with initial
           rectifying mechanism for parallel back-support exoskeleton parallel
           back-support exoskeleton for rehabilitation or power augmentation

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      Authors: Kai Wang, Haoping Wang, Yang Tian, Yemei Xu, Kondo H Adjallah, Zhouhang Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      For the waist assisting, this paper proposes a novel parallel back-support exoskeleton for rehabilitation or power augmentation (PBE-RePA), which is suitable for assisting many types of waist movements and reducing restrictions on daily activities. Considering repetitive waist movements, a time-delay estimation based dual model-free control with initial rectifying mechanism is designed for the trajectory tracking control of PBE-RePA. The system dynamics are reconstructed by ultra-local model while time-delay estimation is utilized to obtain the lumped unknown part in that model. To realize more accurate tracking, an adaptive iterative learning compensator is added to form a new dual model-free control structure, which has excellent control performance in time domain and can enable asymptotically precise tracking along iteration axis. Moreover, the identical initial condition is relaxed by introducing the initial rectifying mechanism to modify the reference trajectory. The virtual prototype of PBE-RePA is established as a platform for visualized co-simulation in MATLAB/Simscape Multibody. The results of two co-simulation cases demonstrate the effectiveness and robustness of the proposed algorithm.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-14T12:59:04Z
      DOI: 10.1177/10775463221075911
       
  • An accurate method for fractional optimal control problems governed by
           nonlinear multi-delay systems

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      Authors: Hamid Reza Marzban
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study introduces a novel framework based on a combination of block-pulse and fractional-order Chebyshev functions. The new framework is a generalization of the fractional-order Chebyshev functions called the fractional hybrid functions. An accurate method is designed for solving nonlinear fractional optimal control problems with fractional multi-delay systems. Two essential linear operators, specifically, the fractional derivative operator and the fractional integral operator are introduced by implementing the Caputo and the Riemann–Liouville fractional operators. The two mentioned operators have a fundamental impact on reducing the computational complexity of the problem under study. Furthermore, these operators enable us to simply transform the principal problem into a new optimization one. Due to the structure of the fractional framework, we can construct an accurate solution for an extensive family of fractional multi-delay systems. By using a generalization of Taylor’s theorem, we prove that the proposed framework is convergent. The reliability, feasibility and accuracy of the new fractional framework are validated through examining a wide range of nontrivial examples.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-14T04:48:07Z
      DOI: 10.1177/10775463211053182
       
  • Efficient technique in computational dynamic modeling of a flexible
           manipulator with large deformation

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      Authors: Mahdi Feyzollahzadeh, Mahdi Bamdad
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In the flexible manipulators, the links could be modeled using rigid elements and torsional springs, and similarly, the flexibility in actuators could be represented with the equivalent springs. This study applies the discrete time transfer matrix method for the dynamic analysis of flexible manipulators with large deformations. On a first-priority basis, transfer matrices are determined, including all the flexible link/joint mechanism components. A single transfer matrix is established for prismatic and rotational actuators with equivalent springs to build the robotic transfer matrix library. On the second priority, to reduce the computation time, a novel algorithm is developed. In the proposed flexible link discretization, the first element of the flexible link is considered as a function of other elements. It is designed to build a mathematical model as closely as possible to the realistic model with fewer elements. It is presented that this modeling technique can employ discrete data extracted by the sensors. The simulation primarily focuses on developing flexible beam/joint models validated in ADAMS. Besides, the dynamic behavior of a flexible PR robot with external forces acting on the linkage system is analyzed and examined. The result shows that the proposed modeling method affords a low computational time while the manipulator control needs to manage fast responses.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-14T04:00:34Z
      DOI: 10.1177/10775463221075902
       
  • Robust nonlinear model predictive sliding mode control algorithm for
           saturated uncertain multivariable mechanical systems

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      Authors: Mohammad Reza Homaeinezhad, Farhad FotoohiNia
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, robust stabilization and predictive tracking control for a class of nonlinear uncertain multivariable systems is presented. The control scheme is built by incorporating nonlinear model predictive control in discrete sliding mode control to obtain optimal results while satisfying hard constraints and closed-loop robustness in the presence of external disturbance (matched or unmatched) and parametric uncertainty. Additionally, the control input domain limitation is involved in construction of the model predictive control scheme by employing sliding functions admissible bounds. The problem of cost minimization is solved through optimal selection of terminal cost gain and allocation of system dynamics with respect to sliding surfaces while robust stabilization and feasibility are ensured through the prediction horizon.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-14T01:55:27Z
      DOI: 10.1177/10775463211065883
       
  • Observer-based fixed-time control for nonlinear systems with enhanced
           nonsingular fast terminal sliding mode

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      Authors: Huihui Pan, Guangming Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, we develop a novel observer-based fixed-time control for a class of uncertain nonlinear systems. First, a fast terminal sliding mode disturbance observer is constructed, which can guarantee accurate estimation of the lumped disturbance in fixed time. Next, using a new fixed-time stable system, a novel enhanced nonsingular fast terminal sliding mode manifold with bounded convergence time independently of the initial states is presented to enhance system convergence rate. Subsequently, by using the presented fast terminal sliding mode disturbance observer and enhanced nonsingular fast terminal sliding mode manifold , the observer-based fixed-time control scheme is developed, which can achieve system stabilization within fixed time and offer global fast convergence property. The fixed-time convergence of the system states under the proposed control approach is analyzed by utilizing the Lyapunov stability theory. Finally, corresponding simulation results are provided to confirm the feasibility and superiority of the new control strategy.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-11T05:17:50Z
      DOI: 10.1177/10775463211053914
       
  • Steady-state dynamic analysis of a nonlinear fluidic soft actuator

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      Authors: Behzad Janizadeh Haji, Mahdi Bamdad
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The internal channel networks embedded within a soft structure can be a fruitful mechanism to create and activate actuators in the research fields of soft robotics. The deformation of the supporting elastic structure from the pressurized viscous fluid into the channels needs an accurate investigation. In this paper, accurate modeling and dynamic analysis of this nonlinear soft actuator is our goal. In this modeling, the soft actuator is considered the Euler–Bernoulli beam with large deflection and nonlinear strain. After implementing Hamilton’s principle, the assumed mode method is used to achieve the mathematical model in terms of the multi-mode system that is more similar to the flexible nature of the actuation system. Steady-state dynamics is investigated by a combination of the complex averaging method with arc-length continuation. The accuracy of the proposed modeling is validated by comparing simulation results to those obtained with a nonlinear finite element method and numerical method. It shows that only one-third of the degree-of-freedoms used for the finite element method are sufficient to obtain equivalent converged solutions with the proposed model. The effect of nonlinear strain and multi-mode consideration in the analysis of the proposed modeling is investigated. It is advantageous to analyze the system performance by looking into the geometrical parameters and fluid properties.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-10T11:25:28Z
      DOI: 10.1177/10775463211066995
       
  • Theoretical, numerical, and experimental study on synchronization of three
           motors coupled with a tensile spring in a nonlinear vibrating system

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      Authors: Mingjun Du, Guang Xiong, Duyu Hou, Lei Du, Rong Yang, Yongjun Hou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A synchronization mechanism for three motors coupled with a tensile spring in a nonlinear vibrating system is proposed to apply in drilling fluid shaker. The purpose of this paper is to investigate the synchronization mechanism of the system. Firstly, the dynamic equations of the system are established by using the Lagrange’s equation, and the steady-state solutions of the system are solved. Then, synchronous conditions and stability criteria of the system in a steady state are obtained. Next, the influences of various structure parameters on the synchronous state of the system are numerically discussed. Additionally, we use the Runge–Kutta algorithm to build an electromagnetic coupling model, and the synchronous behavior of the system is explored. Finally, an experimental strategy including the synchronous tests of the system is implemented to verify the correctness of theoretical analysis, numerical discussion, and simulation. It is concluded that the steady synchronous motion of three motors can be achieved by selecting an appropriate stiffness of the tensile spring. All these study results will provide a strong support for developing the design of large-scale vibration machinery with high efficiency and energy-saving in engineering.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-07T09:04:38Z
      DOI: 10.1177/10775463211047125
       
  • Detection of mode frequencies for spherical cavity embedded within a mild
           steel plate

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      Authors: Subhankar Roy, Tanmoy Bose
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The modern era of structures has observed a vast increase in non-destructive evaluation techniques in order to detect unwanted damages or porosities within the structure. Detection of defect frequencies will play a vital role in local defect resonance–based defect imaging in the future. In this paper, a technique for porosity and cavity detection in metals is discussed. A numerical investigation is carried out first on a square mild steel plate with a spherical cavity and a square mild steel block with multiple cavities. Different resonance frequencies and corresponding mode shapes in the case of the single cavity are calculated using steady state dynamic analysis. Six fundamental mode shapes are identified as Rocking (R), Torsional (T), Bouncing (B), 4-noded (4 N), 6-noded (6 N) and 8-noded (8 N) modes. Moreover, an explicit dynamic analysis is performed by exciting the model with a chirp signal for both cases of single and multiple cavities. The numerical study is supported by experimental results, performed on a mild steel plate embedded with a single spherical cavity and previously published literature. It is observed that the analytical, numerical as well as the experimental results obtained for all the modes are in close agreement with each other. The bouncing mode is found to be the promising one for pore imaging due to its uniform displacement across all the directions.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-07T04:36:18Z
      DOI: 10.1177/10775463211054933
       
  • Parametric study on the dynamic aeroelastic analysis of a two-stage
           axially deploying telescopic wing

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      Authors: Sayed Hossein Moravej Barzani, Hossein Shahverdi, Mohammadreza Amoozgar
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the flutter instability of a conventional two-stage axially moving telescopic UAV wing is investigated. To this aim, and to be as close as possible to the reality, the effects of temporal variation of mass and length, due to the movement of stages and their overlapping, along with the effects of morphing speed are considered for the first time. The bending-torsional dynamics of the two-stage wing is modeled by modifying the Euler–Bernoulli beam theory to take into account the effects of morphing speed and variations of mass and length. Furthermore, the aerodynamic loads are simulated using Peters' unsteady aerodynamic model. The governing aeroelastic equations are discretized using a finite element approach, and a length-based stability analysis is proposed to investigate the aeroelasticity of the wing. The obtained results are compared with those available in the literature, and a good agreement is observed. It is found that the aeroelastic stability of a telescopic wing is more sensitive to the fixed part parameters than the moving part. Also, it is shown that the wing critical length is sensitive to the morphing speed. Therefore, by selecting the telescopic wing morphing parameters properly, the aeroelastic stability of the system can significantly be improved.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-05T11:44:49Z
      DOI: 10.1177/10775463221074145
       
  • Abnormal symptom-triggered remaining useful life prediction for rolling
           element bearings

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      Authors: Yiwei Cheng, Ji Wang, Jun Wu, Haiping Zhu, Yuanhang Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Remaining useful life prediction of rolling element bearings is significant to improve the safety and reliability of engineering systems. It is a vital issue to perceive abnormal symptoms for remaining useful life prediction so as to set the occurrence time as the first prediction time. Traditional methods need to define indicators manually to determine the abnormal symptoms, which rely on a lot of domain knowledge and expert experience. This paper proposes a novel abnormal symptoms-triggered remaining useful life prediction approach for rolling element bearings. An adaptive kernel spectral clustering model is constructed in the abnormal symptoms-triggered remaining useful life prediction approach to adaptively detect the abnormal symptoms in real time from multi-dimensional degradation features extracted by integrating time-domain, frequency-domain, time-frequency, and time-series analysis. The occurrence time of abnormal symptoms is set as the first prediction time of the remaining useful life predictor, which is a new type of particle swarm optimization-quantile regression neural network. A benchmarking dataset of rolling element bearings is adopted to evaluate the proposed abnormal symptoms-triggered remaining useful life prediction approach. Experimental results show that this abnormal symptoms-triggered remaining useful life prediction approach is superior to many other prognostic approaches.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-04T11:18:49Z
      DOI: 10.1177/10775463221074797
       
  • Fuzzy model-based disturbance rejection control for atomic force
           microscopy with input constraint

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      Authors: Parvin Mahmoudabadi, Mahsan Tavakoli-Kakhki, S. Hassan HosseinNia
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Accurate representation of the atomic force microscopy (AFM) system is not only necessary to achieve control objectives, but it is also beneficial for detecting the nanomechanical properties of the samples. To this end, this paper addresses the issue of controller design for the AFM system based on an accurate nonaffine nonlinear distributed-parameters model in which flexibility and distributed mass effects of the microcantilever beam are considered properly. First, a T-S fuzzy model is derived for this dynamical model of the AFM system in order to simplify the procedure of controller design. Then, a fuzzy model-based controller is designed to suppress the chaos and attenuate the disturbance in the AFM system through the linear matrix inequality (LMI) formulation. Moreover, by considering some criteria for disturbance rejection and transient performance, and some constraints on control input and states, new stabilization conditions are proposed based on a fuzzy Lyapunov function. Finally, simulation results are represented to demonstrate the effectiveness of the proposed method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-04T05:59:11Z
      DOI: 10.1177/10775463211050157
       
  • Seismic response of high-rise buildings using long short-term memory
           intelligent decentralized control system

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      Authors: Zhao Li, Jianwei Tu, Jiarui Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Due to the difficulty in adopting the conventional centralized control method for seismic response control of high-rise buildings with complex structures and large sizes, the decentralized control method is applied. The challenge is that the control model of the high-rise structure divided into multiple subsystems changes as large nonlinear deformation under strong earthquakes. Therefore, with an application of the long short-term memory neural network, the long short-term memory intelligent decentralized control method is proposed for seismic response control of high-rise buildings. On the basis of the decentralized control theory for high-rise buildings, a long short-term memory network deep-learning framework is established to construct different types of decentralized controllers, and to determine the sufficient conditions for the stability of the decentralized controllers using the Lyapunov stability theory. The long short-term memory intelligent decentralized control system of a 20-story benchmark building mode is simulated, and its fault tolerance is studied. The simulation results show that the decentralized control method can reduce the complexity of the structure model by dividing the high-rise building structure into multiple subsystems. Compared with the centralized control method, the long short-term memory intelligent decentralized control method can effectively avoid the overall failure of the control system. The long short-term memory intelligent decentralized control method can still have a satisfactory performance under sensor noise and control devices failures. This verifies that the long short-term memory intelligent decentralized control system has a better fault tolerance and can provide an innovative solution for the decentralized control of high-rise buildings.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-04T01:20:27Z
      DOI: 10.1177/10775463221074478
       
  • Adaptive odd repetitive control for magnetically suspended rotor harmonic
           currents suppression

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      Authors: Yue Zhang, Jin Zhou, Xiaoming Han, Yang Zhou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Magnetic levitation rotating machinery has been widely used in industrial applications. Odd harmonic currents in the active magnetic bearing coils, which are caused by rotor mass unbalance and sensor runout, increase the power consumption and the base vibration. Repetitive control has recently been used to suppress harmonic currents in magnetic bearing systems. However, repetitive control needs the rotor rotational speed information and has some limitations without a speed sensor. In this paper, an adaptive odd repetitive control which does not need the speed sensors is proposed to suppress the active magnetic bearing odd harmonic currents. Compared to the conventional repetitive control, the second-order generalized integral frequency-locked loop is applied in adaptive odd repetitive control to estimate the rotor speed in real time without additional speed sensors. The magnetically suspended rotor with harmonic disturbances is modeled. The work principle, structure, and design of the adaptive odd repetitive control are addressed. The simulation and experiments are carried out on a rotor active magnetic bearing test rig to validate the effectiveness of the proposed adaptive odd repetitive control, and the results show that the active magnetic bearing odd harmonic currents are well suppressed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-03T12:42:24Z
      DOI: 10.1177/10775463221074476
       
  • Flexural vibration of multistep rotating Timoshenko shafts using hybrid
           modeling and optimization techniques

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      Authors: Saeed Soheili, Mahdi Abachizadeh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the flexural vibration of uniform and non-uniform rotating shafts based on the Timoshenko beam theory is investigated. Considering shear deformation and gyroscopic effects to build an exact framework of a solution, the fourth-order differential equation of vibration is solved by an analytical method. The overall transfer matrix of the system formed by a series of flexible distributed in addition to lumped elements is achieved. The results obtained by the distributed lumped modeling technique (DLMT) are verified with other techniques. The damped frequencies obtained by the hybrid modeling method for a multistep gas turbine rotor system using the Euler–Bernoulli and Timoshenko beam theories are compared with the results of the transfer matrix method (TMM). It is shown that the presented method provides highly accurate results, while with no compromise, it can be simply and effectively employed for complex systems. It is also shown how the Hooke and Jeeves and the ant colony optimization (ACO) besides the direct enumeration method can be applied to obtain the damped natural frequencies of complicated vibrational systems such as the gas turbine rotors. The comparison between the frequency and damping ratio values obtained by the optimization and direct enumeration methods shows less than 1% error for different cases.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-02T09:46:09Z
      DOI: 10.1177/10775463211072406
       
  • A unified Jacobi–Ritz approach for the FGP annular plate with arbitrary
           boundary conditions based on a higher-order shear deformation theory

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      Authors: Yiming Zhao, Bin Qin, Qingshan Wang, XiFeng Liang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a unified method for free and forced vibration of functionally graded porous annular and circular plate is proposed, incorporating the Jacobi–Ritz method and the higher-order shear deformation theory. In order to improve the accuracy of calculation, the segment strategy is adopted. Meanwhile, the artificial spring is used to express the connection between each truncated plates and arbitrary boundary conditions. The convergency study and validation are implemented, and parametric study of both free and transient forced vibration are conducted. The present method shows a fast convergence property and high accuracy for thick plate. It has been found that boundary conditions are the dominant influencing factor of the central deflection of functionally graded porous annular plate, and the porous material with vertical gradient change in the plate leads to a better impedance effect than the uniformly distributed porous material.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-02T07:41:27Z
      DOI: 10.1177/10775463211072677
       
  • Feedback control of nonlinear stochastic dynamic systems for accurately
           tracking a specified stationary probability density function

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      Authors: Lei Xia, Zhiqiang Liu, Ronghua Huan, Weiqiu Zhu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Limited by the difficulty of obtaining the exact stationary solution of Fokker–Planck–Kolmogorov (FPK) equation, the general control strategy for tracking a specified stationary probability density function have not been obtained till now. However, the feedback control for tracking a pre-specified stationary probability density function plays an important role in engineering or industrial systems. In this paper, a feedback control strategy of nonlinear stochastic dynamic system for accurately tracking a specified stationary probability density function without the requirement of exact stationary solution of Fokker–Planck–Kolmogorov equation is proposed. According to the probability conservation form of the Fokker–Planck–Kolmogorov equation, the stationary Fokker–Planck–Kolmogorov equation is split into a probability circulation flow (PCF) equation and a probability potential flow (PPF) equation. The control force is divided into probability circulation flow part and probability potential flow part accordingly. The probability circulation flow part of the control force is determined to satisfy the probability circulation flow term of the controlled system constructed from the target stationary probability density function. The probability potential flow part of the control force is obtained by solving the probability potential flow equation. A two-dimensional nonlinear stochastic system is carried out as an example. The control force is designed to track different types of target stationary probability density functions. Numerical results show that the proposed control strategy can accurately track the stationary probability density functions without the requirement of the exact solution of Fokker–Planck–Kolmogorov equation. The control efficiency can be regulated by the control parameter C.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-01T09:36:42Z
      DOI: 10.1177/10775463211068904
       
  • Prediction of air compressor condition using vibration signals and machine
           learning algorithms

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      Authors: Aravinth S, Sugumaran V
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Air compressors are widely used equipment in the modern world for their tremendous utilization in applications of both domestic and industrial sectors. The inbuilt mechanical parts are often prone to various failures due to the complexity in the construction of air compressors that affects the overall system process. Hence, it is essential to devise a methodology to identify the failures at the early stages of its operation to avoid the major causalities due to process breakdown and system seizure. In this study, a single-acting single-stage reciprocating air compressor was chosen. The fault conditions like inlet valve fluttering, outlet valve fluttering, valve plate leakage, and check valve fault were considered. The statistical, histogram and autoregressive moving average features were extracted from the raw vibration signals. The most dominating features were selected using a decision tree algorithm and those features were classified using machine learning classifiers like Lazy K Star, Decorate, and radial basis function networks. The classifier Lazy K Star on autoregressive moving average feature exhibits the highest fault classification rate of 99.67% in classifying various compressor conditions and the results were compared and presented.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-01T04:43:07Z
      DOI: 10.1177/10775463211062330
       
  • Tracing the source of unsteady-state low-frequency noise based on wavelet
           coherence analysis

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      Authors: Xiaoping Xie, Yongzhen Chen, Shan Hu, Lifeng Hao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The original partial coherence analysis method can be used to analyze the contributions between different noise sources and field points under steady-state conditions. Nevertheless, coherence analysis cannot be used to deal with unsteady-state signals because the signals are time-varying. In this paper, the method of panel contribution under unsteady-state conditions based on wavelet coherence analysis is proposed to determine the largest noise contribution in the cab. First, the unsteady-state simulation signals are analyzed by wavelet coherence theory. This step not only verifies the effectiveness but also points out that wavelet coherence is more superior to crossed wavelet. Second, the measured unsteady-state signals of the eight measuring points are processed by time-frequency wavelet coherent analysis. According to the obtained two-dimensional time-frequency diagrams, the contribution of different panels to the noise of measuring field points in the continuous frequency range can be found out. Then, the total contribution coefficient sum of each panel in a certain frequency band is calculated. Finally, the above analysis results are used to determine the panels with the largest contribution to the cab noise. The corresponding noise reduction scheme is also proposed. The results show that the overall sound pressure level is obviously decreased after optimization. The noise in the cab is reduced by 4.5dBA ∼ 7dBA. The effectiveness of this method has been further verified by the above results.
      Citation: Journal of Vibration and Control
      PubDate: 2022-03-01T03:00:45Z
      DOI: 10.1177/10775463221074074
       
  • Semi-active control of a new quasi-zero stiffness air suspension for
           commercial vehicles based on H2H∞ state feedback

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      Authors: Lei Chen, Xing Xu, Cong Liang, Xin-wei Jiang, Feng Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To further improve the comprehensive vibration isolation performance of commercial vehicles equipped with traditional passive air suspensions under complex driving conditions, this paper proposes a damping control method based on a new configuration of quasi-zero stiffness air suspension . First, the nonlinear model of quasi-zero stiffness air suspension is established by combining gas thermodynamics and suspension dynamics theories. The semi-active control model of a quarter vehicle quasi-zero stiffness air suspension system is generalized to a linear system considering the uncertainty of stiffness parameter based on the Taylor series expansion. Then, the H2 norm of the sprung mass acceleration is adopted as the control output performance index, while the suspension dynamic deflection constraint and the tire dynamic load constraint are taken as the H∞ performance constraint output index. Based on Lyapunov stability theory, the H2H∞ state feedback control law is designed, and the control law design problem is transformed into a convex optimization problem with linear matrix inequalities. Finally, co-simulation and hardware-in-the-loop test results demonstrate that the proposed new semi-active quasi-zero stiffness air suspension structure and H2H∞ robust control method are effective in substantially improving the multi-objective comprehensive performance of commercial vehicles under different driving conditions.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-28T11:04:20Z
      DOI: 10.1177/10775463211073193
       
  • Structure design and experimental analysis of a perforated dielectric
           elastomer sound absorber

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      Authors: Jie Chen, Jinwu Wu, Shanlin Yan, Qibo Mao, Yanying Zhao, Shan Zeng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A large part of research on membrane mufflers focuses on the sound insulation performance of the membrane, and there is less research on the sound absorption performance of the membrane. In most cases, membrane mufflers only have some narrow absorption peaks in the low frequency band. In this paper, a micro-perforated dielectric elastomer membrane sound absorber is introduced to broaden the sound absorption frequency band of the membrane in the low frequency band. Different initial thickness, perforation aperture, and perforation spacing of the dielectric elastomer membranes were designed and fabricated, and the effect of the variation of the parameters was investigated by testing the sound absorption performance of the structural specimens. It was found that increasing the initial thickness of the membrane, appropriately decreasing the perforation aperture, and appropriately controlling the perforation spacing could improve the sound absorption performance of the structure. And based on the perforated membrane, a ring electrode structure was further designed to realize the electrically adjustable sound absorption frequency of the membrane. After the membrane with the ring electrode structure was perforated in the central region, the sound absorption band of the membrane was broadened significantly, and the applied voltage could realize the electrically adjustable sound absorption performance of the structure in the low frequency band.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-28T07:01:05Z
      DOI: 10.1177/10775463211068898
       
  • Correlation of design parameters of lattice structure for highly tunable
           passive vibration isolator

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      Authors: Muhamad Syafwan Azmi, Rainah Ismail, Azma Putra
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The purpose of this study is to correlate the influence of multiple size-based design parameters of lattice structure, namely, the unit cell (UC) and strut diameter (SD) through the static and dynamics analyses for passive vibration isolation application. The lattice structures were prepared by utilizing the fused deposition modeling (FDM) additive manufacturing (AM). The samples were designed to retain lattice structure’s unique advantages while also conserving material consumption to fulfill the energy and cost demand. Through the static test, the crush behavior, failure mechanism, and mechanical properties were determined. The stiffness of lattice structure exhibited an increasing relationship with the unit cell and strut diameter where smaller unit cell and bigger strut diameter produced higher strength, and with that, higher load can be sustained. Through the dynamic vibration transmissibility test, it was found that the dynamic vibration results follow closely the trend in the static analysis. Lattice structure with larger unit cell and smaller strut diameter showed larger effective isolation region due to lower natural frequency value. The trade-off limit between stiffness for a lower natural frequency of the proposed design parameters was determined from the two parts analyses. The results suggest that most lattice isolators from the pool of design parameter combinations in this study have sufficient strength to withstand the predefined mass load and provide the most region for vibration isolation. The two proposed design parameters can later be used for a major or minor tuning of lattice isolators for other specific applications.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-28T02:08:32Z
      DOI: 10.1177/10775463211070069
       
  • Study on the impedance dynamics and control of the active suspensions
           based on the equilibrium trajectory error

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      Authors: Qiang Chen, Ye Zhuang, Jiaqi Zhao, Bo Li, Weiguang Fan
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A novel approach to design the controller of the active suspension is presented in light of the suspensions’ mechanical impedance dynamics, where the sprung-mass kinematic states, including acceleration, velocity, and displacement are comprehensively modeled considering the concept of suspension mechanical impedance. The proposed impedance controller is designed by tracking the equilibrium trajectory error of the sprung-mass states. The approximate transfer function of the active suspension is derived for choosing the parameters of the virtual mechanical impedance system. The numerical simulation of the suspension amplitude–frequency response is carried out, which demonstrates that the virtual mass and damping parameters have greater influence than the virtual spring parameter. The ride comfort of the suspension controlled by the designed impedance control behaves well in a wide range of road conditions, and the road holding with it is even better than that with the Linear Quadratic Regulator (LQR) control especially around the second-order resonance frequency. The numerical simulation and experimental comparison all demonstrate that the proposed impedance control law, which does not strictly rely on the suspension parameters, could achieve a better power economy and road holding than that of the LQR control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-26T11:10:11Z
      DOI: 10.1177/10775463211048271
       
  • Adaptive finite-time command-filtered backstepping sliding mode control
           for stabilization of a disturbed rotary-inverted-pendulum with
           experimental validation

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      Authors: Omid Mofid, Khalid A Alattas, Saleh Mobayen, Mai The Vu, Yassine Bouteraa
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the finite-time stabilization of the disturbed and uncertain rotary-inverted-pendulum system is studied based on the adaptive backstepping sliding mode control procedure. For this purpose, first of all, the dynamical equation of the rotary-inverted-pendulum system is obtained in the state-space form in the existence of external disturbances and model uncertainties with unknown bound. Afterward, a novel command filter is defined to enhance the control strategy by consideration of a virtual control input. Therefore, the differential signal is replaced by the output of the command filter to reduce the complicated computing in the control process. Hence, the finite-time convergence of the sliding surface to the origin is attested by using the backstepping sliding mode control scheme according to the Lyapunov theory. Besides, the unknown upper bound of the exterior perturbation and uncertainty is approximated providing the adaptive control technique. Finally, simulations and experimental results are done to demonstrate the impression and proficiency of the suggested method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-26T09:13:04Z
      DOI: 10.1177/10775463211064022
       
  • Non-linear dynamic response of misaligned spline coupling: Theoretical
           modeling and experimental investigation

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      Authors: Li Xiao, Yingqiang Xu, Zhiyong Chen, Lan Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Premature wear, fatigue and other failures caused by non-linear vibration are one of the key problems of aerodynamic power transmission in spline coupling which maybe suffer from abnormal meshing effects due to misalignment between internal spline and external spline. A non-linear dynamic model of the misaligned spline coupling is established, which involves the calculation of dynamic meshing behavior of misaligned tooth pairs. The movement state of spline coupling can change from a periodic state to a chaotic state with the increase of speed. Under light load, the main resonance speed of system may be modified due to changes in the load. The existence of misalignment promotes the vibration intensity, advances the main resonance speed and increases the instability of spline coupling. In addition, a test bench for the misalignment spline coupling was developed to measure the vibration acceleration signal, and the effect of the misalignment on the dynamic behavior of spline coupling was discussed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-25T12:25:46Z
      DOI: 10.1177/10775463211067104
       
  • Non-linear modal interactions during rub-impact of a rotating flexible
           shaft

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      Authors: Kartheek Amaroju, Kiran Vijayan, Michael I Friswell
      Abstract: Journal of Vibration and Control, Ahead of Print.
      An understating on interaction between a rotating flexible member and a stationary element has a wide range of industrial applications. The focus of this study was to understand the modal interactions using a conceptual model. The conceptual model of the system consists of multiple disc rotors with a localised conduit. A theoretical model of the system was developed using finite element analysis. An eigenvalue analysis was carried out on the system and a Campbell diagram of the system was developed. The Campbell diagram provided information about the rotor speed wherein synchronization with the whirling modes occur. Further, a reduced order non-linear contact model was developed. A numerical bifurcation analysis with rotor speed as parameter was carried out on the reduced model. Analysis was carried out using randomized initial condition for each rotation speed. During the bifurcation study, certain rotation speed produced a high whirling response at speeds different from the critical speed. The increase in the response was associated with the internal resonance of whirling modes and rotor speed. The participating modes were identified using the Campbell diagram and full spectrum. The results from the theoretical model were validated using an experimental test rig. The identification of these internal resonance rotor speed can be useful in identifying the rotor speed exclusion zone and thereby improves the rotor life.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-25T12:24:18Z
      DOI: 10.1177/10775463211066406
       
  • Vibration isolation performance of simply supported beam installed with a
           negative stiffness device

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      Authors: Xiaoyun Zhang, Dengqing Cao, Mei Liu, Yishen Tian, Jie tang, Bolong Jiang, Wenhu Huang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      A negative stiffness device composed of two horizontal pre-compression springs is proposed to isolate the vibration of the simply supported beam. The nonlinear vibration equation of simply supported beam installed with a negative stiffness device is established by using Hamilton principle first. The lower degree of freedom dynamic equation of the system is derived by using Galerkin truncation approach. The influence of support position and negative stiffness parameters on the natural frequency of the beam are obtained from the modal analysis of the free vibration system. According to the dynamic internal force of the beam, the force transmissibility at the support end is defined and the displacement transmissibility of any point on the beam is also defined to facilitate the analysis of the vibration isolation effect. The influence of negative stiffness support parameters on the amplitude–frequency curve and the transmissibility curve of the simply supported beam is discussed. The results show that the fundamental frequency of the system can be significantly reduced by the negative stiffness device, while the frequencies of high-order modes are changed a little bit only. Increasing the horizontal spring stiffness will reduce the first-order resonance frequency and the initial frequency of vibration isolation. Consequently, the aim of lower frequency vibration isolation for the simply supported beam can be achieved. This paper provides an effective approach to the vibration isolating design of flexible structures.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-24T05:22:37Z
      DOI: 10.1177/10775463211069396
       
  • Study on the influence of sudden load at idle condition on vibration and
           vibration isolation performance of the engine mount system

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      Authors: Fuqiang Luo, Shaozhe Wu, Xinhua Ding, Jing Zhou, Zhifeng Zhou, Yubin Han
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Engine vibration is one of the main excitation sources of vehicle vibration. In order to study the problem of excessive vibration in the cabin of a light vehicle when the air conditioning is turned on at the idle speed, this study is conducted from the point of view of in-cylinder combustion caused by sudden load. The vibrations of the engine with the air conditioning on and off at the idle condition were studied experimentally. The results show that when the air conditioning is turned on at low idle speed, the cylinder pressure rise rate increases with the increase of fuel injection. In addition, the combustion pressure in the cylinder also increases, which leads to the increase of engine vibration. At the same time, a spectrum analysis is carried out in terms of the vibration signal in the maximum direction of the vibration intensity of the suspension system, and the vibration isolation rate is calculated. The results show that the vibration intensity at the second order is the largest, and the vibration isolation effect of the rear suspension is poor.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-24T04:52:07Z
      DOI: 10.1177/10775463211070067
       
  • Comparison of discrete-time sliding mode control algorithms for seismic
           control of buildings with magnetorheological fluid dampers

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      Authors: Muaz Kemerli, Özge Şahin, İrfan Yazıcı, Naci Çağlar, Tahsin Engin
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Semi-active control implementations for structures are gaining considerable attention in civil engineering. This paper presents a method for the design and implementation of the discrete-time sliding mode controller with a hybrid control strategy, based on Gao’s reaching law and the variable rate reaching law, for practical applications in civil structures by using magnetorheological (MR) dampers. The structure is modeled as a five-degree-of-freedom lumped mass system, controlled by an MR damper placed in between the ground and the first floor. The MR damper is experimentally tested and its behavior is represented by using modified Bouc–Wen model and artificial neural network (ANN) as forward and inverse models, respectively. The five-story building is simulated under the seismic excitation of El Centro earthquake along with the historical earthquake records, Northridge and Kobe. It is demonstrated that the hybrid control strategy yields better results regarding the energy consumption of the controller and time-averaged structural responses by eliminating the chattering, compared to Gao’s controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-23T11:51:46Z
      DOI: 10.1177/10775463211070062
       
  • Enhancing stochastic resonance using a reinforcement-learning based method

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      Authors: Jianpeng Ding, Youming Lei
      Abstract: Journal of Vibration and Control, Ahead of Print.
      We propose a new method to enhance stochastic resonance based on reinforcement learning , which does not require a priori knowledge of the underlying dynamics. The reward function of the reinforcement learning algorithm is determined by introducing a moving signal-to-noise ratio, which promptly quantifies the ratio of signal power to noise power by updating time series with a fixed length. To maximize the cumulative reward, the reward function can guide the actions to enhance the signal-to-noise ratio of systems as largely as possible with the help of the moving signal-to-noise ratio. Since the occurrence of the spike of excitable systems, which requires the systems to evolve for some time, should be considered an important component for the definition of the signal-to-noise ratio, the reward corresponding to the current moment cannot be obtained immediately and this usually results in a delayed reward. The delayed reward may cause the policy of the reinforcement learning algorithm to update with an incompatible reward, which affects the stability and convergence of the algorithm. To overcome this challenge, we devise a technique of double Q-tables, where one Q-table is used to generate actions, and the other is used to correct deviations. In this way, the policy can be updated with a corresponding reward, which ameliorates the stability of the algorithm and accelerates its convergence speed. We show with two illustrative examples, the Fitzhugh–Nagumo and Hindmarsh–Rose models, stochastic resonance is significantly enhanced by the proposed method for two typical types of stochastic resonances, classical stochastic resonance with a weak signal and coherent resonance without weak signals, respectively. We also show the robustness of the proposed method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-22T03:36:32Z
      DOI: 10.1177/10775463211068895
       
  • A new configuration of composite nonlinear feedback control for nonlinear
           systems with input saturation

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      Authors: Quanmin Zhu, Saleh Mobayen, Hamidreza Nemati, Jianhua Zhang, Wei Wei
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study proposes a U-control–based Composite Nonlinear Feedback (U-CNF) design procedure. This U-CNF control establishes a double feedback loop framework for generalisation and simplification in designing the CNF control systems. Two controllers, in terms of double dynamic inversion, are designed separately, (1) to stabilise and cancel the nonlinearities and dynamics (convert the plant into an identity matrix) in the inner closed-loop, and then (2) to improve the system transient response by specifying a second-order linear system with a monotonic nonlinear function to smoothly tune the damping ratio. Accordingly, the conventional CNF characteristics in a concise pathway are achieved. The properties show, under proper conditions, the U-CNF control is plant model-free control, applicable to nonaffine nonlinear dynamic systems, and robust against model uncertainty and external disturbance. For the initial bench tests of the first-time proposed U-CNF configuration, the simulated case studies are provided with a transparent procedure to demonstrate the consistency with the analytical results in the numerical computations and to present guidance for applications.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-22T03:17:51Z
      DOI: 10.1177/10775463211064010
       
  • Research on dynamic response of multi-layer beam system considering random
           interlayer parameters

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      Authors: Wangbao Zhou, Lingxu Wu, Lizhong Jiang, Yuntai Zhang, Shaohui Liu, Xiang Liu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To study the influence of interlayer stiffness and interlayer damping on the dynamic response of multi-layer beams under moving loads, a method for calculating the dynamic response of a multi-layer beam system considering random interlayer stiffness or random interlayer damping under successive moving loads based on the Karhunen–Loéve expansion and point estimation method is proposed. The accuracy of the proposed method was verified by using several numerical examples. The influence of interlayer stiffness, interlayer damping, standard deviation of interlayer stiffness, and standard deviation of interlayer damping on the dynamic response of a girder-rail system was analyzed by using the proposed calculation method. The results show that when the moving load velocity is high, the number of critical velocity of the rail significantly increases with decreasing interlayer stiffness. In addition, dynamic responses of the rail and girder increase with decreasing interlayer damping and the dynamic response of rail at the midspan significantly increases as the standard deviation of interlayer stiffness increases. Neglecting interlayer damping can lead to significant fluctuation in the dynamic response of rail, a significant increase in the number of critical velocity of rail, and increases in the dynamic responses of rail and girder. Changing interlayer stiffness, interlayer damping, standard deviation of interlayer stiffness, or standard deviation of interlayer damping will have no obvious influence on the dynamic response of girder.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-21T10:45:16Z
      DOI: 10.1177/10775463211072628
       
  • Experimental study of the source and transmission characteristics of
           train-induced vibration in the over-track building in a metro depot

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      Authors: Ruihua Liang, Deyun Ding, Weifeng Liu, Fangqiu Sun, Yilong Cheng
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To improve the utilization of land resources, in recent years, there has been an increase in the design and construction of over-track buildings in metro depots in China. However, there are daily tasks such as testing, parking, and maintenance of metro trains in the depot, vibration induced by trains in those tasks may exert impact upon the residents living in the buildings over the metro depots. In this paper, detailed on-site measurements were carried out to investigate the source and transmission characteristics of train-induced vibrations in the metro depot. The main results indicated that (i) the magnitudes of train-induced vibration on the testing lines and throat areas are greater than other areas, and the issue of environmental vibrations induced by trains in the building near these areas need to be given more attention. (ii) Train-induced vibrations are more attenuated from the ground to the platform and less attenuated from the platform to the building floor, and most vibration acceleration levels below 30 Hz are even amplified during the transmission from the platform to the floors in the building, which could be because of the matching of the frequencies of train-induced vibrations and the natural frequencies of the superstructure.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-20T09:31:35Z
      DOI: 10.1177/10775463211070106
       
  • Size-dependent thermoelastic damping analysis in nanobeam resonators based
           on Eringen’s nonlocal elasticity and modified couple stress theories

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      Authors: Harendra Kumar, Santwana Mukhopadhyay
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Thermoelastic damping has emerged as a critical issue in the modeling and design of micro and nanomechanical systems. Therefore, an extensive research interest is being devoted towards the reduction in thermoelastic damping for micro and nanomechanical systems. The present study intends to examine thermoelastic damping in nanobeam resonators using the modified couple stress theory and Eringen’s nonlocal elasticity theory, thus so-called modified nonlocal couple stress theory within the context of the recently proposed Moore–Gibson–Thompson thermoelasticity theory. In order to observe size effects, the size-dependent coupled thermoelastic equations are derived by combining modified couple stress theory and nonlocal elasticity theory in the frame of Moore–Gibson–Thompson thermoelasticity. The coupled governing equations for thermoelastic damping of nanobeam resonators are solved analytically in terms of the inverse quality factor. The size-dependent thermoelastic damping of nanobeams is presented graphically with the help of numerical results predicted by modified nonlocal couple stress theory. The results obtained under the combined effects of modified couple stress theory and nonlocal theory in the present context are further compared to those of the classical, modified couple stress, and nonlocal elasticity theories as special cases of the modified nonlocal couple stress theory. It is observed that thermoelastic damping weakens at the submicron scale under Eringen’s nonlocal elasticity theory, whereas it becomes greater at the submicron scale under modified couple stress theory. However, at the submicron scale, the modeling of nanobeam resonators using modified nonlocal couple stress theory reveals a smaller amount of thermoelastic damping than modified couple stress, nonlocal, and classical theories. In addition, as compared to the Green–Naghdi thermoelasticity theory of type III (GN-III), the Moore–Gibson–Thompson model predicts a higher thermoelastic damping value, while agreeing with the results predicted by the Lord–Shulman (LS) model under modified nonlocal couple stress theory. Some important points highlighted here are believed to be useful in the design of mechanical resonators at micron and submicron scales.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-15T06:31:54Z
      DOI: 10.1177/10775463211064689
       
  • Robust active vibration suppression of single-walled carbon nanotube using
           adaptive sliding-mode control and electrostatic actuators

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      Authors: Yang Wang, Zhen Wang, Xiaojuan Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the electrostatic actuator-based active vibration control of a single-wall carbon nanotube conveying fluid is studied. A double electrostatic actuator scheme is developed and its decoupling method also is proposed. Then, a novel adaptive sliding-mode control (SMC) scheme is developed. The newly proposed scheme future improves existing results from two aspects: (1) the newly proposed adaptive SMC can work well under high uncertain case in which all parameters are uncertain and the uncertainties cannot be separated from control force and (2) a double electrostatic actuators scheme which can suppress the vibration of carbon nanotube in multiple directions is designed, and a novel decoupling scheme for the two actuators is developed. The stability of the closed-loop system is analyzed by using Lyapunov stability theory. Finally, the simulation results illustrate the effectiveness of the proposed scheme.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-11T09:28:31Z
      DOI: 10.1177/10775463211063046
       
  • Effects of general boundary conditions on vibro-acoustic responses of the
           panel-cavity system induced by a turbulent boundary layer

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      Authors: Heye Xiao, Chi Z. Xu, Pei X. Yu, Jin T. Gu, Dan Sui, Jie Zhou
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This study proposes an analytical method for building a vibro-acoustic model of a panel-cavity system induced by a turbulent boundary layer (TBL) excitation, which is used to study the influences of boundary conditions on the vibro-acoustic responses of the system. In the theoretic model, the elastic restraints at the plate’s edges and the wall impedance of the cavity wall are considered at the same time. Based on the mode expansion, the vibro-acoustic response function of the vibro-acoustic model is built to present the coupling between the TBL and the system constructed by the panel and the cavity. Then, the model is validated by comparing it with the previous study, which shows good agreements. Finally, the effects of the boundary conditions, such as stiffness, damping, and impedance, on the mean quadratic velocity spectra and radiated sound power of the panel-cavity system are studied. It is demonstrated that the decrease of the boundary stiffness makes the radiated sound power of the panel drop above the frequency of the panel third mode. The boundary damping of the panel decreases the vibro-acoustic response of the panel-cavity system by working as an attenuation factor of the boundary. Furthermore, the increase of the radiated sound power with different wall impedances is due to the coupling between the structural mode of the panel and the acoustic mode of the cavity, or the resonance of acoustic mode in the vibration propagation direction.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-11T07:45:53Z
      DOI: 10.1177/10775463211066724
       
  • Fuzzy logic and proportional integral derivative based multi-objective
           optimization of active suspension system of a 4×4 in-wheel motor driven
           electrical vehicle

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      Authors: Ömer Bingül, Ahmet Yıldız
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This paper considers fuzzy logic and proportional integral derivative based multi-objective optimization of a non-linear active suspension system of a 4 × 4 in-wheel motor-driven electric vehicle by using the non-dominated sorting genetic algorithm II. The active suspension system of the electric vehicle and its controllers are optimized to achieve International Organization for Standardization2631-1 ride comfort and health criteria, also providing the actual working conditions such as roll angle and tire load transfers simultaneously for driving safety. In this regard, a non-linear full electrical vehicle model with quadratic tire and cubic suspension stiffnesses with 11 degrees of freedom and a seat-driver model with 5 degrees of freedom are implemented and optimized regarding seven objective functions determined from the root mean square of head and seat accelerations, crest factor , vibration dose value , the ratio of head and seat accelerations, the ratio of the upper torso and seat acceleration, root mean square upper torso acceleration, and root mean square of suspension, tire, and in-wheel motor displacements. The design variables of the optimization problem are chosen as the stiffnesses and damping coefficients of the suspension, in-wheel motors, and seat, as well as the parameters of the proportional derivative and fuzzy logic controllers. The obtained results demonstrate that significant improvements can be achieved by using a controller over the passive systems. It is also noted that the fuzzy logic controller improves ride comfort and the health criterion over proportional derivative system up to 13%, while the load transfer ratio index showed no adverse change between models concerning the rollover condition. The outcomes of this work clearly state that significant improvements, in terms of vibration exposure, can be achieved with the help of reducing the vibration amplitude of an in-wheel motor-driven electrical vehicle active suspension system by using multi-objective optimization considering a non-linear full vehicle model and realistic working conditions such as tire load transfer and vehicle body roll during cornering circumstances. Thus, obtained results are of utmost importance for manufacturers about the active suspension design process providing both a safe and comfortable driving of in-wheel driven electric vehicles.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-10T06:53:16Z
      DOI: 10.1177/10775463211062691
       
  • On the adaptive synchronous control of a large-scale dual-shaker platform
           system

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      Authors: Xinhui Li, Tiejun Yang, Wenke Li, Michael J Brennan, Minggang Zhu, Lei Wu
      Abstract: Journal of Vibration and Control, Ahead of Print.
      There is an ever-increasing requirement for higher power vibrating platforms to test large-scale structures. Whilst this may be achieved with a single shaker, this is an expensive option. An alternative solution is to drive a platform with two or more smaller shakers. To do this effectively, however, requires the identical amplitude and phase response of the shakers. In practice, due to manufacturing tolerances and uneven loading, this is not possible without a control system. The design and implementation of such a system is the objective of this paper. An adaptive FxLMS algorithm is used in the synchronous control of a dual-shaker system, considering the dynamic coupling between the shakers. A simulation is presented to verify the effectiveness of the control algorithm before the control system is integrated with practical a dual-shaker system driving a vibrating platform. It is shown that there are significant differences between the controlled and the uncontrolled system, demonstrating the efficacy of the control approach.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-10T06:19:22Z
      DOI: 10.1177/10775463211068905
       
  • A machine learning-based model for real-time leak pinpointing in buildings
           using accelerometers

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      Authors: Samer El-Zahab, Abobakr Al-Sakkaf, Eslam Mohammed Abdelkader, Tarek Zayed
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Modern water networks from municipal network to building networks are plagued with the threat of leaks. Leaks create a significant amount of loss of resources. Pressurized water pipelines are more susceptible due to the high pressure at which water travels. Multiple researchers have tried to utilize a variety of static (devices that are left in the network) and dynamic (devices that are mobilized to the suspected location) leak detection techniques to ensure the early detection and pinpointing of leaks in water transportation networks. The main goal is to provide quick and efficient tools that can identify and pinpoint leaks in buildings while being cost-effective. This article proposes a small-scale experimental static real-time monitoring system that can identify leaks and their location with high accuracy by measuring vibration signals via wireless accelerometers. The experiment utilizes one-inch and two-inch Polyvinyl Chloride (PVC) and iron pipelines, which are commonly used in residential buildings. Since the proposed system is static, the wireless accelerometers are placed on the exterior walls of the pipelines. The vibration signals, derived from each accelerometer, were calculated and analyzed. A leak is identified when a spike in the signal is detected. Once a leak was identified, the model would move to determine the source of the signal, that is, the leak location. The developed models proved to be capable of accurately pinpointing leaks within an accuracy of 25 cm. The main techniques that were used in model development were regression analysis and backpropagation of artificial neural networks models.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-09T12:18:58Z
      DOI: 10.1177/10775463211066247
       
  • Research on time-delay-dependent H∞/H2 optimal control of
           magnetorheological semi-active suspension with response delay

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      Authors: Renkai Ding, Ruochen Wang, Xiangpeng Meng, Long Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Considering the influence of the magnetorheological damper response time delay on the low-frequency vibration (body vibration) and multi-objective control requirements of the semi-active suspension system, a novel H∞/H2 controller (time-delay-dependent H∞/H2 optimal controller) is proposed in this paper. Based on the Lyapunov–Krasovskii function and robust control theory, a time-delay-dependent H∞/H2 controller in consideration of the MR damper response time delay is designed to reduce and remove the effects of time delay on the semi-active suspension system. To obtain better suspension control performances, the optimal selection strategy of anti-interference coefficients in the time-delay-dependent H∞/H2 controller is proposed. Then, the time-delay-dependent H∞/H2 optimal controller is structured built on the optimal selection strategy. With the application of matrix properties and the cone-compensation linearization algorithm, the nonlinear matrix inequality for controller design is linearized, and the feedback gain matrix of the controller is solved iteratively. Finally, comparative simulation and experimental research are conducted to verify the effectiveness and superiority of the designed optimal controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-08T11:02:31Z
      DOI: 10.1177/10775463211064380
       
  • Study on the hydraulic leveraged dynamic anti-resonance vibration isolator
           with nonlinear damping characteristics

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      Authors: Ningyuan Duan, Haiting Yu, Zhenguo Zhang, Hongxing Hua
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The hydraulic leveraged dynamic anti-resonance vibration isolator with nonlinear damping characteristics are analyzed under harmonic excitations. A nonlinear mathematical model is proposed considering both the nonlinear damping of the fluid resistance and the volumetric stiffness induced by the bulge effect. The harmonic balance method, combined with the arc-length continuation algorithm, is performed to investigate the steady-state response and vibration transmissibility quantitively. The optimization of isolator parameters are obtained using the fixed-point theory, which leads to the relation between the damping coefficients and isolation performance. Parametric studies are then carried out to investigate the effects of the volumetric stiffness, bellows stiffness, and lever ratio on the isolation performance. The results indicate the importance of the damping parameters on the design of the band-stop characteristics to achieve the anticipated performance of anti-resonance isolators. Furthermore, the inertia-amplification ratio of the anti-resonance isolator needs to be balanced against its stopband suppression performance for the fluid-type leveraged system.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-08T10:37:13Z
      DOI: 10.1177/10775463211060895
       
  • Dynamic performance of the energy harvester with a fractional-order
           derivative circuit

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      Authors: Bin Wang, Jinguo Liu, Bo Tang, Ming Xu, Yongge Li
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Vibration energy harvesters are expected to replace chemical batteries and achieve self-power for low-power electronic devices, and their design has attracted significant attention. In previous studies, circuits consistent with the constitutive relationship with integer derivatives were frequently used, but fractional-order derivative circuits have received less attention. Because of the dissipation effects, such as internal friction and thermal memory, the fractional-order derivative is an effective mathematical approach for determining such nonconservative behaviors. In this study, the dynamic performance of a vibration energy harvester with a fractional-order derivative circuit in a random environment was investigated. Both linear and nonlinear vibration energy harvesters were evaluated using the linear random vibration theory and the equivalent linearization technique. The effects of the system parameters on the mean output power were analyzed, and the optimal system parameters, such as the oscillation frequency of the circuit and the coupling coefficient, were determined. Furthermore, the relationships between the optimal parameters and the order of the fractional derivative were established. Our study will potentially guide future designs of vibration energy harvesters.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-08T10:26:17Z
      DOI: 10.1177/10775463211064651
       
  • Multiple-input multiple-output robust vibration control for constrained
           gyroelastic solar panel considering parametric and un-modeled dynamic
           uncertainties

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      Authors: E Bin, Wang Xiaogang, Shan Jinjun, Muhammad A Khushnood, Cui Naigang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Gyroelastic solar panel is a kind of flexible solar panel structure with variable-speed control moment gyroscopes distributed inside. The torque generated by these variable-speed control moment gyroscopes can be used for active vibration suppression. This paper addresses the vibration suppression problem of gyroelastic solar panel in the presence of parametric uncertainties and un-modeled dynamic uncertainties. A novel μ-synthesis method based on analytical multiple-input multiple-output weights design is proposed, which relates 2-norm of the vector of regulated outputs, closed-loop modal damping, and relative control ability of actuators to each mode to the weights. Based on the idea of collocated control, the full order state-space model of the constrained gyroelastic plate with angle gyros as measuring devices is derived. After model reduction, modeling of un-modeled dynamic, and designing the multiple-input multiple-output weights, μ-controller is solved by the DK-iteration method. Furthermore, a comparative study of the μ-controller designed by the proposed procedure and the Positive Position Feedback (PPF) controller designed by the non-smooth H∞ synthesis method is also presented. The control methods are compared for their vibration attenuation, energy utilization, robustness performance characteristics, and robustness stability characteristics. Results for both time domain and frequency domain simulations are presented. Simulation results show that the designed μ-controller has better vibration attenuation effect and robustness performance characteristics than the PPF controller, and can achieve a better robust vibration suppression of the constrained gyroelastic solar panel in presence of parametric and un-modeled dynamic uncertainties.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-08T01:16:57Z
      DOI: 10.1177/10775463211048971
       
  • Nonlinear vibration and resonance analysis of a rectangular hyperelastic
           membrane resting on a Winkler–Pasternak elastic medium under hydrostatic
           pressure

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      Authors: Sina Karimi, Habib Ahmadi, Kamran Foroutan
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the nonlinear vibration and resonance analyses of a rectangular hyperelastic membrane embedded within a nonlinear Winkler–Pasternak elastic medium subjected to a uniformly distributed hydrostatic pressure are investigated. The material of the membrane is incompressible, homogeneous, isotropic, and hyperelastic. The constitutive law of neo-Hookean is utilized for modeling the system. The elastic foundation includes two Winkler and Pasternak linear terms and a Winkler term with cubic nonlinearity. Using the theory of thin hyperelastic membrane, Hamilton’s principle, and assuming the finite deformations, the governing equations are obtained. Then, the motion equation in the transverse direction is discretized by applying Galerkin’s method. The transverse nonlinear oscillations of the membrane are considered in two-modes. Then, utilizing the multiple scales method, the secondary resonance for the case of [math] is analyzed. Also, to analyze the nonlinear vibration behavior, numerical methods including the fourth-order Runge–Kutta methods are utilized. In addition, in analyzing the nonlinear vibration responses of the rectangular hyperelastic membrane, the bifurcation diagram, quasi-period motion responses, and the phase portrait are examined. Finally, the influence of the geometrical characteristics and elastic foundation parameters on the resonance analysis of a rectangular hyperelastic membrane is investigated.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-07T11:05:04Z
      DOI: 10.1177/10775463211062339
       
  • Self-tuning control of parametrically excited active magnetic bearing
           system due to harmonic base motion using fuzzy logic

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      Authors: Tukesh Soni, Jayanta K Dutt, AS Das
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Using active magnetic bearings for vibration control of flexible rotors subject to large base motion is both interesting and challenging. Rotors on ships, airplanes, and space-crafts fall in this category. These applications pose challenge for the active magnetic bearing designer, as the large motion of base renders the rotor-shaft-AMB system, time varying in nature, and also causes parametric excitation to the rotor system. Apart from stability concerns in such systems, it is difficult to design and choose optimal values of controller parameters because the system is subject to different base motions at different times during operation. In order to address this issue, this work applies fuzzy logic and proposes a simple yet effective selftuning control (STC) to control vibrations of flexible rotors supported by active magnetic bearings, which is subject to excitations due to base motion, in addition to unbalance excitation, usually present in rotors. To this end, first, the controller parameters are optimized considering the levitation performance of active magnetic bearings based on the transient response. Next, the fuzzy logic-based self-tuning algorithm is presented. Detailed comparison of performance between optimal and self-tuning control for different base motion conditions show that the proposed self-tuning controller outperforms the optimal control.
      Citation: Journal of Vibration and Control
      PubDate: 2022-02-04T02:21:15Z
      DOI: 10.1177/10775463211059867
       
  • Retraction notice: Application of a V-belt continuously variable
           transmission system by using a composite recurrent Laguerre orthogonal
           polynomial neural network control system and modified particle swarm
           optimization

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      Abstract: Journal of Vibration and Control, Ahead of Print.

      Citation: Journal of Vibration and Control
      PubDate: 2022-02-02T06:23:24Z
      DOI: 10.1177/10775463221074088
       
  • Inplane vibration analysis of rotating beams with elastic restraints

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      Authors: Lvsen Wang, Zhu Su, Lifeng Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, the dynamic model of a rotating beam with elastic restraints is constructed by Euler–Bernoulli and Timoshenko beam theories. The study includes the Coriolis effect and the additional effect of dynamic centrifugal stiffness. A modified Fourier series method is used for expanding displacement field functions in the analysis. The standard eigenvalue equation is established and written in terms of the state space for dynamic analysis. Then, the natural frequencies of the rotating beam are calculated. The convergence analysis and the comparison of the results are carried out to verify the applicability of the method. The effects of the rotational velocity and boundary stiffness on the natural frequencies are analysed. The results show that the influence of the linear spring on the frequency is more evident than that of the torsional spring. The boundary can be considered to be elastic restraints when the boundary stiffness is within a certain interval. With the increase in the rotational velocity, the phenomenon of modal exchange appears. The elastic restraints cause the rotational velocity of the modal exchange to lag. Finally, the reason that the fundamental frequency goes to zero with increasing rotational velocity is explained. The Coriolis effect and elastic restraints reduce the critical velocity.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-29T02:45:03Z
      DOI: 10.1177/10775463211064690
       
  • Subband reinforced adaptive feedback control algorithm in mechanical
           vibration control

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      Authors: Mingke Ren, Xiling Xie, Zhiyi Zhang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In mechanical vibration control, the conventional least mean square (LMS)-based adaptive feedback control algorithm can hardly lead to a satisfying suppression of tonal vibrations when the disturbance is composed of multiple harmonics. The convergence rate of the conventional LMS-based adaptive feedback algorithm is analyzed, and it is revealed that the convergence rate is significantly affected by the magnitude product of the control channel and the disturbance. The smaller the magnitude product, the slower the convergence speed. Based on this analysis, a subband reinforced adaptive feedback control algorithm is proposed to increase the convergence rate in the frequency band of weak controllability. In this algorithm, the components of slow convergence rate are first extracted from the error signal with subband filters and then controlled independently to achieve fast attenuation. The role of these subband filters is to increase the magnitude product of associated components. Numerical and experimental results have shown that the reinforced adaptive control algorithm is effective and the tonal components, including those of weak controllability, are suppressed almost in the whole frequency range. The proposed algorithm can achieve better vibration attenuation than the conventional LMS-based adaptive feedback algorithm when the disturbance contains multiple harmonics.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-28T02:11:07Z
      DOI: 10.1177/10775463211051451
       
  • Feedback control of limit cycle oscillations and transonic buzz, using the
           nonlinear transonic small disturbance aerodynamics

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      Authors: Jae R Kwon, Ranjan Vepa
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, a systematic method to suppress transonic buzz with feedback is presented. A trailing edge control surface in the form of part-span flap was used only to modify and control the unsteady aerodynamic loading on the wing. The flap rotation was used to provide feedback, which consisted of a weighted linear combination of the amplitudes of the principal modes of the structure, referred to as the control law. A linear, optimal feedback control law, that is synthesized systematically based on pseudo-spectral time domain analysis, may be used in principle, to assess its capacity to actively suppress the buzz in the transonic flow domain by using a servo-controlled control surface to modify the unsteady, nonlinear aerodynamic loads on the wing. Thus, it is essential that a set of feasible control laws are first constructed. In this paper, this is done by applying the doublet-lattice method. Restrictions, such as near-zero structural damping in the flap mode, were imposed on the aeroelastic model to facilitate the occurrence of transonic buzz. The feasible set of control laws were then assessed using the nonlinear transonic small disturbance theory and an optimum control is selected to suppress the buzz. The essential differences of the behaviour of the closed-loop system in nonlinear transonic flow, when compared to the applications of linear optimal control in linear potential flow, are presented and discussed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-28T02:05:15Z
      DOI: 10.1177/10775463211052370
       
  • Nonlinear optimal control for a five-link parallel robotic manipulator

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      Authors: Gerasimos Rigatos, Masoud Abbaszadeh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Control and stabilization of parallel robotic manipulators is a non-trivial problem because of nonlinearities and the multi-variable structure. In this article, a nonlinear optimal control approach is proposed for the dynamic model of such robotic systems, using as a case-study the model of a five-link parallel robot. The dynamic model of the parallel robotic manipulator undergoes approximate linearization around a temporary operating point that is recomputed at each time-step of the control method. The linearization relies on Taylor series expansion and on the associated Jacobian matrices. For the linearized state-space model of the system, a stabilizing optimal (H-infinity) feedback controller is designed. This controller stands as a solution to the nonlinear optimal control problem under model uncertainty and external perturbations. To compute the controller’s feedback gains, an algebraic Riccati equation is repetitively solved at each iteration of the control algorithm. The stability properties of the control method are proven through Lyapunov analysis. Finally, to implement state estimation-based control without the need to measure the entire state vector of the parallel robotic manipulator, the H-infinity Kalman filter is used as a robust state estimator. Among the advantages of this control method, one can note that (i) unlike the popular computed-torque method for robotic manipulators, the new control approach is characterized by optimality and is also applicable when the number of control inputs is not equal to the robot’s number of DOFs and (ii) it achieves fast and accurate tracking of reference set points under minimal energy consumption by the robot’s actuators.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-27T06:42:37Z
      DOI: 10.1177/10775463211051449
       
  • Enhanced method for optimum driving point identification for modal testing

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      Authors: Gerwin Pasch, Stefan Wischmann, Pascal Drichel, Georg Jacobs, Joerg Berroth
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Modal testing is used to experimentally determine the dynamic behavior of mechanical structures. The planning of the positions for exciting the structure, the so-called driving points, is essential for efficient experimental modal testing. Driving points are identified either by an initial assumption of possible excitation points and the experimental evaluation of their quality, or with the help of numerical models and indicators for optimal driving point selection. However, for practical applications, several driving points are usually required to excite all modes in the frequency range of interest, which is not covered in state-of-the-art indicators for driving point selection. This paper therefore presents a method for driving point identification with consideration of multiple driving points. Additionally, a criterion was developed that considers the excitability of modes, risks of double hits, and the excitation orientation simultaneously in order to increase the accuracy of the driving point identification. This criterion enables the evaluation of the excitation quality of each surface node and any mode combination using an automated selection method for determining the optimum set of driving points. The presented method assumes that natural frequencies and eigenvectors from preliminary numerical models are available for planning. By applying the method on application examples, the reduced effort required for a full modal analysis is demonstrated.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-25T01:31:33Z
      DOI: 10.1177/10775463211064699
       
  • Sliding mode control for fractional-order time-varying delay systems under
           external excitation

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      Authors: Xianzeng Shi, Yitong Jin, Xingde Zhou, Chunxiu Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, by using Lyapunov–Krasovskii stability theory and linear matrix inequality approach, the control problem for fractional-order systems under seismic waves with time-varying delays is studied. A novel switching surface is proposed. Based on the linear quadratic regulator and sliding mode control, some sufficient conditions are derived to ensure the fractional system under control. Mittag-Leffler stability theorem is adopted to prove that the switching surface could converge to zero. Finally, a numerical simulation example is provided to validate the advantages and effectiveness of the proposed results.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-24T07:50:15Z
      DOI: 10.1177/10775463211069201
       
  • Identifying rotor-stator rubbing positions based on intrinsic time scale
           decomposition-hjorth-cepstrum

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      Authors: Mingyue Yu, Wangying Chen, Jianguo Cui, Jinglin Wang
      Abstract: Journal of Vibration and Control, Ahead of Print.
      To accurately locate rotor–stator rubbing faults in aero-engine, a method combining intrinsic time scale decomposition (ITD), Hjorth parameter and cepstrum analysis has been proposed. First, the method works by decomposing vibration signals from casing into proper rotation components (PRCs) based on ITD; second, calculates the autocorrelation function of each rotation component and the complexity parameters of autocorrelation functions; third, chooses PRCs for signal reconstruction according to complexity from Hjorth parameters and reconstructs the signals based on chosen PRCs; at last, considering that with different positions of rubbing, transfer paths of signals collected by the sensors from the same position are different, cepstrum analysis has been made according to reconstructed signals, and the transfer paths characteristics from cepstrum are taken as feature vectors and inputted into support vector machine for identifying the positions of rotor-stator rubbing faults. The results indicate proposed ITD-Hjorth-Cepstrum method can work well in the identification rate of training and test samples as for the identification rate for an unknown sample.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-20T10:18:44Z
      DOI: 10.1177/10775463211050172
       
  • Assessing design and manufacturing quality of tractor gearboxes by their
           vibration characteristics

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      Authors: Vasiliy Migal, Shchasiana Arhun, Mykhailo Shuliak, Andrii Hnatov, Iryna Trunova, Igor Shevchenko
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The paper deals with the development of a vibration-based technique for assessing quality and detecting design and manufacturing defects of tractor gearboxes. It highlights full-scale experimental studies of vibro-diagnostic characteristics of tractor gearboxes including carrying out vibration measurement and spectrum analysis; identifying statistical limit values of structural vibration parameters and their dependence on the technical condition of tractors; and comparing the vibration characteristics with acceptable vibrations which do not affect the acceleration of the process of tractor gearbox wear. All studies were conducted for tractor gearboxes of wheeled tractors T-150K, KhTZ-170, and T-17221 produced by Kharkiv Tractor Plant and equipped with identical tractor gearboxes of the same manufacturer. It has been determined that the vibration levels of gearboxes at the manufacturing stage exceed the acceptable vibrations by 10–30 dB. The main reason for the accelerated development of faults and decrease in the lifetime of most gearbox mechanisms is an increase in vibration loading by 2.5–31.6 times over the acceptable levels. The practical significance of the results obtained is in solving the problem of improving the design and manufacturing of tractor gearboxes T-150k through the use of the developed criteria for permissible vibration by methods of reducing the vibration level of detected defects. All the above mentioned makes it possible to create a complex of normative and technical, and methodological documentation to improve the reliability of tractors.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-20T10:09:52Z
      DOI: 10.1177/10775463211060899
       
  • Structural parameter inversion of a gravity dam based on the dynamic
           response induced by an underwater explosion

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      Authors: Yijia Liu, Lu Wenbo, Gaohui Wang, Lyu Linmei, Yeqing Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The overall mechanical behavior of the structure of a gravity dam is comprehensively reflected by modal information included in the measured vibration response. In this study, the dynamic elastic modulus of the dam body and foundation materials were inverted via an underwater explosion, and analyzed. First, the first three main frequencies and basic mode shapes of the dam were obtained based on the acceleration response induced by the explosion. Then, the support vector regression model optimized with the particle swarm optimization algorithm was used to invert the mechanical parameters. The results indicate that the objective function that considers dominant frequency and mode shape has a greater advantage in terms of anti-noise compared to when only the dominant frequency is considered. The inverted dynamic elastic modulus is about 1.5 times that of the static elastic modulus of the corresponding material, and the calculated modal values using the inversion parameters are basically consistent with the measured values. This method provides a new way of determining the dynamic parameters of gravity dams.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-17T05:57:28Z
      DOI: 10.1177/10775463211066992
       
  • Stochastic model predictive control for driver assistance control of
           intelligent vehicles considering uncertain driving environment

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      Authors: Yimin Chen, Yunxuan Song, Liru Shi, Jian Gao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Advanced driver assistance control faces great challenges in cooperating with the nearby vehicles. The assistance controller of an intelligent vehicle has to provide control efforts properly to prevent possible collisions without interfering with the drivers. This paper proposes a novel driver assistance control method for intelligent ground vehicles to cooperate with the nearby vehicles, using the stochastic model predictive control algorithm. The assistance controller is designed to correct the drivers’ steering maneuvers when there is a risk of possible collisions, so that the drivers are not interfered. To enhance the cooperation between the vehicles, the nearby vehicle motion is predicted and included in the assistance controller design. The position uncertainties of the nearby vehicle are considered by the stochastic model predictive control approach via chance constraints. Simulation studies are conducted to validate the proposed control method. The results show that the assistance controller can help the drivers avoid possible collisions with the nearby vehicles and the driving safety can be guaranteed.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-12T03:09:13Z
      DOI: 10.1177/10775463211052353
       
  • Component-scaled signal reconstruction for enhanced noise filtration

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      Authors: Aryan Singh, Keegan J Moore
      Abstract: Journal of Vibration and Control, Ahead of Print.
      This research introduces a procedure for signal denoising based on linear combinations of intrinsic mode functions (IMFs) extracted using empirical mode decomposition (EMD). The method, termed component-scaled signal reconstruction, employs the standard EMD algorithm, with no enhancements to decompose the signal into a set of IMFs. The problem of mode mixing is leveraged for noise removal by constructing an optimal linear combination of the potentially mixed IMFs. The optimal linear combination is determined using an optimization routine with an objective function that maximizes and minimizes the information and noise, respectively, in the denoised signal. The method is demonstrated by applying it to a computer-generated voice sample and the displacement response of a cantilever beam with local stiffness nonlinearity. In the first application, the noise is introduced into the sample manually by adding a Gaussian white-noise signal to the signal. In the second application, the response of the entire beam is filmed using two 1-megapixel cameras, and the three-dimensional displacement field is extracted using digital image correlation. The noise in this application arises entirely from the images captured. The proposed method is compared to existing EMD, ensemble EMD, and LMD based denoising approaches and is found to perform better.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-12T01:58:40Z
      DOI: 10.1177/10775463211051461
       
  • Model-based robust control design and experimental validation of SCARA
           robot system with uncertainty

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      Authors: ShengChao Zhen, MuCun Ma, XiaoLi Liu, Feng Chen, Han Zhao, Ye-Hwa Chen
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this paper, we design a novel robust control method to reduce the trajectory tracking errors of the SCARA robot with uncertainties including parameters such as uncertainty of the mechanical system and external disturbance, which are time-varying and nonlinear. Then, we propose a deterministic form of the model-based robust control algorithm to deal with the uncertainties. The proposed control algorithm is composed of two parts according to the assumed upper limit of the system uncertainties: one is the traditional proportional-derivative control, and the other is the robust control based on the Lyapunov method, which has the characteristics of model-based and error-based. The stability of the proposed control algorithm is proved by the Lyapunov method theoretically, which shows the system can maintain uniformly bounded and uniformly ultimately bounded. The experimental platform includes the rapid controller prototyping cSPACE, which is designed to reduce programming time and to improve the efficiency of the practical operation. Moreover, we adopt different friction models to investigate the effect of friction on robot performance in robot joints. Finally, numerical simulation and experimental results indicate that the control algorithm proposed in this paper has desired control performance on the SCARA robot.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-11T07:46:27Z
      DOI: 10.1177/10775463211042178
       
  • Dynamic responses and control of geared transmission system based on
           multibody modeling methodology

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      Authors: ZhaoYuan Yao, JunGuo Wang, YongXiang Zhao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, an innovative modeling approach is put forward to research the effect of eccentricity on the nonlinear dynamical behaviors of geared-bearing system. This refined model contains the rigid body of the rotor-bearing system and separated gear teeth which are considered as individual bodies elastically attached to the gear hub with revolute joints. The internal and external excitations of the proposed model include torsional joint stiffness, roll bearing forces, friction between gear pair, gear eccentricity, and so on. The systematic procedure for the calculation of torsional joint stiffness, bearing forces and friction coefficient considering elastohydrodynamic is also conducted. After that, the influence of eccentricity on nonlinear dynamic characteristics of the geared transmission system is analyzed. To avoid the system moving in the unstable motion state, a dry friction damper controller is designed to control the nonlinear behaviors simulated on the basis of above model. The linear feedback and periodic excitation non-feedback control strategies are, respectively, selected to design the actuator. It is indicated that undesirable behaviors of the geared transmission system can be avoided effectively by applying the proposed control method.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-11T03:35:46Z
      DOI: 10.1177/10775463211049584
       
  • Vibration control of an unbalanced system using a quasi-zero stiffness
           vibration isolator with fluidic actuators and composite material: An
           experimental study

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      Authors: Sivakumar Solaiachari, Jayakumar Lakshmipathy
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, a new type of vibration isolator based on fluidic actuators and a composite slab was tested experimentally with an unbalanced disturbance. Quasi-zero stiffness vibration isolation techniques are advanced and provide effective isolation performance for non-nominal loads. The isolation performance of the proposed isolator was compared to that of a nonlinear vibration isolator equipped with fluidic actuators and a mechanical coil spring (NLVIFA). The NLVIFA system is better suited to non-nominal loads; however, the mechanical spring axial deflection leads to limited amplitude reduction in the system. To address this issue, a cross buckled slab was developed to replace a mechanical coil spring for absorbing vertical deflection by transverse bending, which is made of a specially developed composite material of Basalt fiber reinforced with epoxy resin and enhanced with graphene nano pellets. This current study was concerned with the theoretical analysis and experimental investigations of the proposed nonlinear vibration isolator with fluidic actuators and composite material (NLVIFA-CM), which performs under quasi-zero stiffness characteristics. Because of its reduced axial deflection, the theoretical and experimental results show that the NLVIFA-CM system outperforms the NLVIFA system and other linear type vibration isolators in terms of isolation performance. Furthermore, the proposed vibration isolator makes a significant contribution to low-frequency vibration.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-10T12:12:03Z
      DOI: 10.1177/10775463211051458
       
  • Barrier Lyapunov function-based adaptive prescribed performance control of
           the PMSM used in robots with full-state and input constraints

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      Authors: Yankui Song, Yu Xia, Jiaxu Wang, Junyang Li, Cheng Wang, Yanfeng Han, Ke Xiao
      Abstract: Journal of Vibration and Control, Ahead of Print.
      The permanent magnet synchronous motor is extensively used in robots due to its superior performances. However, robots mostly operate in unstructured and dynamically changing environments. Therefore, it is urgent and challenging to achieve high-performance control with high security and reliability. This paper investigates an accelerated adaptive fuzzy neural prescribed performance controller for the PMSM to solve chaotic oscillations, prescribed output performance constraint, full-state constraints, input constraints, uncertain time delays, and unknown external disturbances. First, for ensuring the permanent magnet synchronous motor with higher security, faster response speed, and lower tracking error simultaneously, a novel unified prescribed performance log-type barrier Lyapunov function is proposed to handle both prescribed output performance constraint and full-state constraints. Subsequently, a continuous differentiable constraint function-based model is introduced for solving input constraints nonlinearity. The Lyapunov–Krasovskii functions are utilized to compensate the uncertain time delays. Besides, a type-2 sequential fuzzy neural network is exploited to approximate unknown nonlinearities and unknown gain. For the “explosion of complexity” associated with backstepping, a tracking differentiator is integrated into this controller. Furthermore, a speed function is introduced in the backstepping technique for accelerated convergence. On the basis of above works, the accelerated adaptive backstepping controller is achieved. And the presented controller can ensure that all the closed-loop signals are ultimate boundedness, and all state variables are restricted in the prespecified regions and the permanent magnet synchronous motor successfully escapes from chaotic oscillations. Finally, the simulation results verify the effectiveness of the proposed controller.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-10T12:04:04Z
      DOI: 10.1177/10775463211063256
       
  • Orthonormal piecewise Bernoulli functions: Application for optimal control
           problems generated using fractional integro-differential equations

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      Authors: Mohammad Hossein Heydari, Mohsen Razzaghi, Zakieh Avazzadeh
      Abstract: Journal of Vibration and Control, Ahead of Print.
      In this study, the orthonormal piecewise Bernoulli functions are generated as a new kind of basis functions. An explicit matrix related to fractional integration of these functions is obtained. An efficient direct method is developed to solve a novel set of optimal control problems defined using a fractional integro-differential equation. The presented technique is based on the expressed basis functions and their fractional integral matrix together with the Gauss–Legendre integration method and the Lagrange multipliers algorithm. This approach converts the original problem into a mathematical programming one. Three examples are investigated numerically to verify the capability and reliability of the approach.
      Citation: Journal of Vibration and Control
      PubDate: 2022-01-10T11:37:26Z
      DOI: 10.1177/10775463211059364
       
  • Upper limb involuntary tremor reduction using cantilever beam TMDs

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      Authors: Sarah Gebai, Gwendal Cumunel, Mohammad Hammoud, Gilles Foret, Emmanuel Roze, Elodie Hainque
      Abstract: Journal of Vibration and Control, Ahead of Print.
      Tuned mass dampers (TMDs) are proposed as a solution to reduce the involuntary tremor at the upper limb of a patient with postural tremor. The upper limb is modeled as a three-degrees-of-freedom rotating system in the vertical plane, with a flexion-extension motion at the joints. The measured extensor carpi radialis signal of a patient is used to excite the dynamic model. We propose a numerical methodology to optimize the parameters of the TMDs in the frequency domain combined with the response in the time domain. The objective function for the optimization of