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)

  First | 1 2 3 4 | Last

Similar Journals
Journal Cover
Journal of Low Frequency Noise, Vibration and Active Control
Journal Prestige (SJR): 0.506
Citation Impact (citeScore): 2
Number of Followers: 8  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1461-3484 - ISSN (Online) 2048-4046
Published by Sage Publications Homepage  [1174 journals]
  • The numerical calculation method based on equivalent frequency-independent
           time-domain damping model

    • Authors: Panxu Sun, Shuxia Wang, Dongwei Wang
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In order to realize the time-domain analysis based on hysteretic damping model, the frequency-independent time-domain damping model of single degree of freedom (SDOF) system is constructed. Based on the assumed relationship of vibration responses, the equivalent frequency-independent time-domain damping model in complex domain and real domain are proposed. The characteristic that the dissipated energy in each cycle is not related to the vibration frequency of external excitation is retained for the two equivalent damping models. Combined with Newmark-β method, the corresponding numerical methods are obtained. The numerical examples show that the free vibration responses are stably convergent based on equivalent damping models. The numerical results of vibration responses of SDOF system due to earthquake wave have high calculation accuracy. Compared with equivalent frequency-independent time-domain damping model in real domain, the computational accuracy of equivalent frequency-independent time-domain damping model in complex domain is higher, and the computational efficiency is lower.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-21T05:54:56Z
      DOI: 10.1177/14613484221108224
       
  • Nonlinear dynamics and static bifurcations control of the 12-pole magnetic
           bearings system utilizing the integral resonant control strategy

    • Authors: Nasser A Saeed, Sabry M El-Shourbagy, Magdi Kamel, Kamal R Raslan, Mohamed K Aboudaif
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In this study, the Integral Resonant Controller (IRC) is presented along with the Proportional-Derivative (PD) controller as a novel control technique to control the dynamical behaviors of the 12-pole rotor active magnetic bearing system. According to the proposed control strategy, the system model has been derived as a two-degree-of-freedom nonlinear dynamical system coupled with two first-order filters. The obtained mathematical model has been analyzed utilizing the asymptotic analysis. The nonlinear algebraic system that governs the steady-state vibration amplitudes and corresponding phase angles of the considered system has been extracted. The influence of the IRC control parameters on the rotor dynamics has been explored by plotting the different bifurcation diagrams. The analytical investigations demonstrated that the vibration suppression efficiency of the combined controller (i.e., PD and IRC) is proportional to the product of control and feedback gains of the IRC as well as the derivative gain of the PD-controller. In addition, it is found that the controller efficiency is inversely proportional to both the square of the internal loop feedback gain of the IRC and the position gain of the PD-controller. Accordingly, an objective function has been derived to design the best control gains of the proposed controller strategy. The analytical and numerical simulations confirmed that the suggested control method can suppress the system vibration and eliminate the catastrophic bifurcation behaviors if the control gains are selected according to the proposed objective function. Finally, the effect of failing one of the coupled integral resonant controllers on the rotor dynamics has been explored as a precautionary procedure. It is found that the failure of one of the coupled integral resonant controllers may breakdown the bifurcation symmetry of the rotor system, but the system does not lose its stability.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-17T01:38:47Z
      DOI: 10.1177/14613484221104818
       
  • Investigation on the transient impact characteristics of fast switching
           valve during excitation stage

    • Authors: Qiang Gao
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Fast switching valve (FSV) inevitably experiences high-speed impact while obtaining high dynamics, which affects its control accuracy and service life. In this article, the impact characteristics of the FSV during the excitation stage are investigated. Firstly, a nonlinear mathematical model considering the magnetic saturation is established and verified. Then, the influences of three types of driving voltages on the initial impact velocity and the opening time of the FSV are analyzed, which proves that only the driving voltage featured by an interval of negative voltage (−24V) can obtain a good balance between the initial impact velocity and opening time. In addition, finite element simulations of transient impact characteristics show that smaller initial impact velocity is beneficial to reduce the impact displacement, equivalent stress, and wear volume. The influences of impact times on the flow area of the valve seat are quantitatively analyzed under different impact velocities. Theoretical results indicate that, compared to the high driving voltage, the variation of flow area per million impacts is reduced by 27.3% under the presented driving voltage. Finally, experimental results demonstrate that with the presented driving voltage, the average acceleration and the average noise are reduced by 65.7% and 12%, respectively. And the acceleration frequency spectrum and the modal simulation both reveal the composition of impact noise, in which the noise heard by the human ear is mainly impacted noise, not the ringing noise.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-14T05:42:11Z
      DOI: 10.1177/14613484221107639
       
  • A short remark on He’s frequency formulation

    • Authors: Hongjin Ma
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Recently Shen suggested a modification of He’s frequency formulation using Lagrange interpolation with great success for the cubic-quintic Duffing oscillator. This paper proposed an alternative modification of He’s frequency formulation by dividing the oscillators into two extreme conditions when the amplitude is either extremely small or remarkably large, and He’s frequency formulation is used for each case, and a final frequency formulation is obtained by matching the two extreme conditions. Comparison of the approximate frequency with the exact one for various amplitudes shows good agreement.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-09T09:04:15Z
      DOI: 10.1177/14613484221107291
       
  • Master-slave synchronous control method for attenuating dual mode
           electromechanical transmission system torsional vibration

    • Authors: Wei Zhang, Hui Liu, Xun Zhang, Zhen Wang, Pengfei Yan
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The high-power electromechanical transmission (EMT) system is a typical dual-mode hybrid power transmission system. The torque fluctuation of internal combustion engine causes serious shock and vibration problems of EMT. Suppressing torsional vibration based on high dynamic motor torque regulation is an important way to improve the working life and stability of EMT system. First, a lbased on the lumped parameter linear dynamic model,the torsional vibration characteristics are analyzed. Second, a fluctuating speed estimation method is proposed based on the uniformly accelerated motion model and linear regression, and a digital high pass filter is designed. Then, a master-slave coupling active torsional vibration control strategy is proposed, and a PD control algorithm based on speed feedback is designed. The variation rules of control parameters is analyzed. Finally, the control effect is verified by experiments. The results show that the lever coefficient Kab and differential coefficient Kd of master-slave control can change the natural frequency of torsional vibration of the system, thus significantly changing the vibration response of the system. Selecting appropriate control parameters can achieve peak clipping of EMT torsional resonance.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-08T09:55:55Z
      DOI: 10.1177/14613484221104886
       
  • Semi-analytical solution of non-homogeneous Duffing oscillator equation by
           the Padé differential transformation algorithm

    • Authors: Noufe H Aljahdaly, Maram A Alharbi
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The Duffing oscillator equation is one of important equations that model several nonlinear phenomena in science and engineering. The differential transform method (DTM) is applied to obtain the solutions of homogeneous and non-homogeneous Duffing oscillator equations under the influence of different initial conditions. In fact, the DTM can only find the solutions of the Duffing oscillator equation in a small domain, therefore the method has been improved using Padé approximation. We obtain the solutions by the Padé-DTM (PDTM) in long domain. This article proves the validity, simplicity and applicability of the PDTM method. In addition, the accuracy of the PDTM and the instability of the solution are discussed.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-08T02:57:21Z
      DOI: 10.1177/14613484221107355
       
  • Iterative reweighted atomic norm minimization based two-dimensional
           multiple-snapshot grid-free compressive beamforming with planar microphone
           array

    • Authors: Yang Yang, Zhigang Chu, Guijiao Wu
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Compressive beamforming with a planar microphone array can effectively estimate the two-dimensional directions-of-arrival and quantify the strengths of acoustic sources. Due to the superiorities of overcoming the basis mismatch issue of the conventional grid-based method and improving the performance of the single-snapshot grid-free method, the multiple-snapshot grid-free method has become the current research focus. Its existing atomic norm minimization (ANM) based strategy blocks high resolution because it cannot work well for sources with a small separation. This paper commits itself to remedying this drawback. After revealing the cause for this drawback, we present an iterative reweighted ANM (IRANM) approach. Both simulations and experiments demonstrate that compared with the ANM-based two-dimensional multiple-snapshot grid-free compressive beamforming, the IRANM-based one enjoys not only the enhanced resolution but also the stronger denoising ability and the higher identification accuracy.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-07T10:24:19Z
      DOI: 10.1177/14613484221104622
       
  • Simulating isothermal Euler model with non-vacuum initial data via mR
           scheme

    • Authors: Mahmoud AE Abdelrahman, Hanan A Alkhidhr, Kamel Mohamed
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      We consider the isothermal Euler model with non-vacuum initial data. We extract the Riemann invariants of the isothermal Euler model, which admits vital applications. We also design the modified Rusanov (mR) scheme to solve the isothermal Euler model. This scheme consists of two steps, the first step of the scheme depends on a local parameter allowing to control diffusion. The second stage recovers conservation equation. This technique is a straightforward to implement and precise. We compare this scheme with the Rusanov scheme via three numerical examples. This numerical study verifies the efficiency of the mR scheme. Finally, the mR scheme can be used to solve many other models in applied science.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-06-07T02:45:30Z
      DOI: 10.1177/14613484221105147
       
  • Fault diagnosis of rolling bearing based on singular spectrum analysis and
           wide convolution kernel neural network

    • Authors: Rui Zhu, Mingxin Wang, Siyu Xu, Kai li, Qingpeng Han, Xin Tong, Keyuan He
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Research on bearing fault diagnosis generally uses a single signal processing method to extract features to a certain extent and then empirically judges the fault type at this stage. However, this approach has a poor fault feature extraction effect when the noise interference signal is large and subjective human errors. The diagnosis effect is determined by external interference and has no practical value. This paper proposes a rolling bearing fault diagnosis method based on singular spectrum analysis and a wide convolution kernel neural network, which can effectively extract the fault features of the rolling bearing crack fault signal with a strong noise interference and realize the efficient diagnosis of this kind of fault. Gaussian white noise is added to the standard bearing fault signal to construct the vibration signal with noise interference. Then, the noisy one-dimensional time series signal is preprocessed, including the data division into the training and test sets and the different kinds of numbering processing. Singular spectrum analysis is performed on the preprocessed data. Then, the denoised training set is used as input in a deep convolution neural network with a wide convolution kernel for feature extraction and model training. The trained diagnosis model is used for the fault prediction of the next test set, and the relevant diagnosis results are output. The test results show that this method can ensure the overall accuracy of more than 90% under the background of high noise, and the diagnosis rate of the model under various working conditions is stably maintained at more than 93%, without the collapse of diagnosis stability under the sudden change of noise. The advantages of model diagnosis efficiency and structural improvement fit are prominent.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-30T11:25:44Z
      DOI: 10.1177/14613484221104639
       
  • Galerkin method, ansatz method, and He’s frequency formulation for
           modeling the forced damped parametric driven pendulum oscillators

    • Authors: Haifa A Alyousef, Alvaro H Salas, Muteb R Alharthi, Samir A El-Tantawy
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The forced damped parametric driven pendulum oscillators are analyzed numerically via the Galerkin method (GM) and analytically using both ansatz method (AM) and He’s frequency formulation. One of the most important features of the obtained numerical approximation using GM is that it can recover a large number of different oscillators related to the problem under study. Moreover, the mentioned equation is solved analytically via both AM and He’s frequency formulation. Also, the analytical approximations can recover many different oscillators related to the problem under consideration. Both analytical and numerical approximations are compared with each other and with Runge–Kutta (RK) numerical approximation by estimating both maximum global distance and residual errors. The proposed method can help many authors interested in studying the dynamic problems to explain the mechanics of oscillating to different oscillators in physics, plasma models, engineering, and biological systems.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-30T07:36:11Z
      DOI: 10.1177/14613484221101235
       
  • Fractal variational principle for an optimal control problem

    • Authors: Hongjin Ma
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The optimal control of a system governed by an elliptic equation has been widely applied in engineering, and it requires twice differentiability. Furthermore, the optimal control cannot effectively deal with unsmooth boundaries. Now, the condition will not be maintained for a long time because this paper suggests a fractal optimal control of a system governed by a fractal variational principle to deal with unsmooth boundaries. The new optimal theory has obvious advantages in low differentiability for an unsmooth boundary problem. The air conditioning in a room is used as an example to show how to maintain maximum comfortableness of the workplace and maximum efficiency of energy saving.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-28T04:34:37Z
      DOI: 10.1177/14613484221104647
       
  • Nonlinear vibration of an orthotropic moving membrane

    • Authors: Mingyue Shao, Jiajuan Qing, Jing Wang, Jimei Wu, Zhicheng Xue
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper addresses the dynamic behaviours of an orthotropic moving membrane. Considering the material properties of the membrane, a mathematical model is developed via the von Karman’s large deflection theory. The dynamic behaviours are demonstrated by numerical analysis based on the Runge–Kutta fourth-order method. These numerical examples provide important insights into the impacts of the velocity, aspect ratio and orthotropic coefficient on the nonlinear dynamics of the orthotropic membrane.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-26T09:37:33Z
      DOI: 10.1177/14613484221104642
       
  • Influence of shaft combined misalignment on vibration and noise
           characteristics in a marine centrifugal pump

    • Authors: Qijiang Ma, Kai Wang, Houlin Liu, Zhiming Cheng
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Shaft combined misalignment is the main form of shaft misalignment fault in a marine centrifugal pump. To investigate the influence of shaft misalignment on the vibration and noise of marine centrifugal pumps, a marine pump is experimentally measured under normal condition and shaft combined misalignment condition. In this paper, the frequency domain characteristics of vibration and noise are analyzed by Fast Fourier transform technique. The characteristics of axis orbit, the spectral characteristics of vibration and noise, and the One-Third octave spectral distribution characteristics are also comprehensively compared. Results show that after shaft combined misalignment occurs, the maximum amplitudes of 1APF (axial passing frequency) in the X and Y directions at M1 increase by 35.06% and 24.04%, the maximum amplitudes of 2APF in the X and Y directions at M1 increase by 2.61 times and 2.61 times, and the axis orbit shows a clockwise variation of the “8” shape. As the flow rate decreases, the shape of an “8” of the rotor axis orbit becomes progressively flatter. The maximum Overall vibration velocity level (OAVL) of M2 and M5 decreases by 12.03% and 1.79%, and the maximum OAVL of M3 and M4 increases by 6.52% and 2.27%. The frequency domain amplitude of M6 increases significantly in 1APF and 2APF, and the maximum increases are 12.41% and 2.24% at different flow rates. The overall sound pressure level of M6 increases by 0.42% at 0.6Qd. These findings indicate the vibration energy of M1-M5 and noise energy of M6 are related to the running condition. The axis orbit of M1 shows the shape of 8, which can significantly judge the misalignment of the shafting. Then, combined with the amplitude variation of 1APF and 2APF of the M2-M6 spectrum, the comprehensive misalignment of shafting can be further judged. The above discoveries provide reference to the diagnosis of shaft combined misalignment fault that occurred for the marine pump.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-25T10:44:43Z
      DOI: 10.1177/14613484221104627
       
  • Experimental investigation of dynamic characteristics of material applied
           to reduced scale physical models in the elastic state

    • Authors: Jennifer DM Cavalheiro, Roberto D Machado, Marlon WM Cunico
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Dynamic and vibration difficulties have begun to play a major part in structural analysis as a result of the increasing complexity and slimness of bridges. Nonetheless, creating numerical models that accurately capture the true behaviour of structures remains a challenge. It can be caused by the lack of references that characterise the dynamic and vibration properties of the material. For that reason, the main goal of this work is to investigate experimental methods to characterise materials that are commonly used to build reduced scale physical models. We tested four types of materials in order to achieve this goal, as well as evaluating the major influence of reinforcement on the material’s elastic stiffness. That presents a novel approach to support engineers to suitably select scaled physical models materials. In addition to identifying the basic static properties of the studied materials, material damping and material relaxation were also characterised through the following: General logarithmic decrement method, Half-power band, modal damping and random decrement. In order to evaluate the material damping, we analysed the acceleration and displacement of cantilever specimens using a data acquisition module. As a result, the confidence level of each approach in contrast to the experimental data could be determined. Finally, the material behaviour of each material was examined in order to determine the best material for producing reduced scaled models of reinforced concrete bridges. As a result, it was easy to see that modal damping indicates higher confidence, whereas logarithmic decrement indicates lower confidence. It is also important to keep in mind that most methods for determining damping ratios are based on viscous damping. As a result, non-linear regression and modal damping were deemed the best methods for characterising vibration and dynamic responses of materials.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-25T10:37:03Z
      DOI: 10.1177/14613484211045261
       
  • Accurate analytical solution of the circular sector oscillation by the
           modified harmonic balance method

    • Authors: Nadia M Farea, Mohra Zayed, Gamal M Ismail
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper aims to solve the nonlinear differential equation of the circular sector oscillator analytically via the modified harmonic balance method (MHBM). To assess the reliability and the precision of the present method, we have compared the obtained results with the global residue harmonic balance method, Akbari–Ganji’s method, and numerical Runge–Kutta method which reveals that the MHBM is more reliable than others methods.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-25T02:39:44Z
      DOI: 10.1177/14613484221104646
       
  • Adaptive tracking control for a class of stochastic nonlinearly
           parameterized systems with time-varying input delay using fuzzy logic
           systems

    • Authors: Hongyun Yue, Chunmei Gong
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper addresses the problem of adaptive tracking control for a class of stochastic nonlinear systems with time-varying input delays, and the nonlinear functions of the systems are with not only the unknown parameters but also the unknown state time-varying delays, which is different from the previous work. In this paper, through a state transformation, the system can be easily transformed into a system without the time-varying input delay; the appropriate Lyapunov–Krasovskii functionals are used to compensate the unknown time-varying delay terms, and the quadratic functions instead of the quartic functions often utilized in the existing results are used as Lyapunov functions to analyze the stability of systems and the hyperbolic tangent functions are introduced to deal with the Hessian terms. Fuzzy logic systems (FLSs) in Mamdani type are used to approximate the unknown nonlinear functions. Then, based on the backstepping technique, the adaptive fuzzy controller is designed. The three main advantages of the developed scheme are that (i) unlike the existing results which deal with the nonlinearly parameterized functions by using the separation principle, the nonlinearly parameterized functions are lumped into the continuous functions which can be approximated by using the FLS; (ii) the number of the adjusted parameters only depend on the order of the investigated systems, which can reduce the computational burden greatly; and (iii) the existence of the time-varying input delay such that the controller design becomes much more difficult, and in this paper, it can be dealt with by using an appropriate state transformation. It is proven that all the signals of the closed-loop system are semi-globally uniformly ultimately bounded in probability, whereas the tracking error converges to a small neighborhood of the origin. Finally, simulation results are provided to show the effectiveness of the proposed approach.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-18T02:09:14Z
      DOI: 10.1177/14613484211045761
       
  • Two-stage equal reliability optimization for mega-sub controlled structure
           system with lead rubber bearings

    • Authors: Buqiao Fan, Xun’an Zhang, Mustapha Abdulhadi, Zhi-hao Wang
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The Mega-Sub Controlled Structure Systems (MSCSS) with lead rubber bearings (LRBs) is an innovative and attractive vibration control system. This study proposes a method for obtaining the optimal member sizes of the MSCSS with LRBs under non-stationary stochastic ground motions. Based on the structural characteristics of the MSCSS with LRBs, this study puts forward the “optimal criteria method with two-stage equal reliability.” The probability density evolution theory is used for the dynamic reliability analysis of the MSCSS with LRBs, and a MATLAB program is written for the member size optimization. A finite element model with four mega-floors and 32 sub-floors is studied as an example. The reliability and seismic response of the model before and after optimization are compared. The optimization eliminates the “weak floors” in the structure so that the reliability distribution after optimization is more uniform than before, and the seismic performance of the structure is also improved.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-17T05:58:51Z
      DOI: 10.1177/14613484221101228
       
  • Immediate solution for fractional nonlinear oscillators using the
           equivalent linearized method

    • Authors: Yusry O El-Dib
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The existence of the derivative with a fractional-order in a class of differential equations could lead to complicating the analysis. In this paper, a novel approach has been introduced to facilitate the analysis of the oscillation having fractional-order derivatives and to obtain the analytical solution easily. The present technique is formulated to provide an easy way of understanding. The suggested technique has been utilized to study two examples for illustration. The similitude between the analytical and numerical solution verifies and gives satisfactory precision to the equivalent solution. The new technique is represented to be the best tool for solving the nonlinear oscillation problems in physics and engineering which have a fractional-order.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-05-07T12:30:00Z
      DOI: 10.1177/14613484221098788
       
  • Identification of factors affecting noise levels by using data mining and
           design of experiments analysis techniques: A novel experimental approach

    • Authors: Âli Yurdun Orbak, Fikret Umut Aydın, Shubham Sharma, Jasgurpreet S Chohan, S Rajkumar
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The sounds that are high enough, which negatively affect our understanding, are called noise. Although students are one of the main sources of noise at schools, noise adversely affects students’ success. Schools’ acoustics and the time when the noise measurement is made are usually considered to be other reasons for noise. In this study, noise measurements are collected in several of a metropolitan city’s primary and secondary schools, and factors that affect noise significantly are investigated using 23 full factorial experimental designs. In addition, school teachers’ perception of noise is analyzed by the Apriori algorithm. Results indicate that noise values exceed the limit values set by the WHO and noise regulations currently in effect in Turkey. Also, the schools with no acoustic insulation were noisier than those with minimum insulation. From the Apriori analysis, it is concluded that female teachers are more sensitive than male teachers about noise annoyance.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-29T08:54:39Z
      DOI: 10.1177/14613484221091076
       
  • Optimization and analysis of mine drainage pump with high efficiency and
           large flow

    • Authors: Yong Wang, Xiaolin Wang, Houlin Liu, Lei Xie
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper aimed to systematically maximize hydraulic efficiency and pump head for mine drainage pump using numerical simulation method and optimization design method. First, the preliminary design of the pump is carried out according to the traditional design method, and then the impeller and diffuser of mine drainage pump are optimized by orthogonal test method and computational fluid dynamics numerical simulation method aiming at the hydraulic efficiency of the pump. The results show that under the rated working conditions, the hydraulic efficiency of the optimized mine drainage pump is 82.11%, the pump head is 25.94 m, and the hydraulic efficiency and pump head are increased by 3.58% and 1.53 m, respectively. Furthermore, under the flow conditions of 0.8Qd, 1.0Qd and 1.2Qd, the average radial force of the optimized impeller is reduced by 22.4 N, 18.5 N and 13.1 N respectively, and the average axial force is reduced by 36.7 N, 30.2 N and 27.3 N compared with the original scheme. It indicated that the optimization effect of mine drainage pump is obvious. Through the analysis of the characteristics of the internal flow field, it is illustrated that the reasonable control of the internal flow law of the pump can effectively improve the hydraulic performance of the pump and improve the stability of the pump operation.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-29T05:49:53Z
      DOI: 10.1177/14613484221094404
       
  • Global residue harmonic balance method for strongly nonlinear oscillator
           with cubic and harmonic restoring force

    • Authors: Junfeng Lu
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      AbstractThis paper focuses on the numerical investigation of a strongly nonlinear oscillator with cubic and harmonic restoring force. We transform this oscillator as a free damped cubic-quintic Duffing oscillator equation by Taylor approximation. The approximated solutions with high accuracy are provided by using the global residue harmonic balance method (GRHBM) without any discretization or restrict assumptions. The sensitive analysis of the approximation or the frequency with respect to the amplitude is considered in detail. Numerical comparisons with Runge–Kutta method and harmonic balance method are given to show the efficiency and stability of GRHBM.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-28T08:48:25Z
      DOI: 10.1177/14613484221097465
       
  • An active control method for vibration reduction of a single-link flexible
           manipulator

    • Authors: Pengyu Ma, Ruiqiang Xia, Xuebin Wang, Xuping Zhang, Grzegorz Królczyk, Paolo Gardoni, Zhixiong Li
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      There are three motion stages for an industrial robot manipulator, including the acceleration stage, the constant velocity stage, and the deceleration stage. Aiming at reducing the residual vibration of the manipulator after the movement of the deceleration, a new method is proposed by configuring the movement parameters of the flexible manipulator. Firstly, we conduct experiments to verify a numerical vibration model of the manipulator, and then, we analyze the vibration suppression effect under different conditions based on the numerical model. The results show that in the range of one movement, the residual vibration can be well suppressed when the acceleration and deceleration time are set as a positive integer to the natural period of the manipulator operation; otherwise, the vibration suppression effect is not obvious and proportional to the difference between the acceleration/deceleration time and the manipulator natural period.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-24T06:27:09Z
      DOI: 10.1177/14613484221094982
       
  • Numerical optimizing noise damping performances of Helmholtz resonators
           with a rigid baffle implemented at neck in presence of a grazing flow

    • Authors: Weiwei Wu, Yiheng Guan
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      As an applicable noise attenuator, Helmholtz resonator is mainly used to dampen acoustic noise at low- and medium-frequency ranges. It is typically implemented in combustion-engines and gas turbines to dampen thermoacoustic instabilities. However, it has a narrow effective frequency range and does not work effectively at off-design conditions. In this work, we consider a modified structured Helmholtz resonator (HR) at its neck by applying a rigid baffle in order to maximize its’ noise damping effect and to broaden its frequency bands. The resonator is attached to a cylindrical duct/pipe in presence of a mean flow (grazing flow), aiming to simulate the practical engines flow configuration. For this, a two-dimensional frequency domain numerical model is developed by using COMSOL V5.3. The numerical simulations are carried out by solving the linearized Navier–Stokes equation in frequency domain with low computational cost and time. In order to obtain an optimum design in terms of the maximum noise damping performances, 10 new different configurations/designs are proposed. The effects of 1) the single baffle attached to the upstream or downstream sidewall of the neck ends, that is, Design A, B, C, and D or double baffles, that is, Design E, F, G, and H), 2) the baffle implementation location, 3) the length of the rigid baffle, and 4) the grazing flow low Mach number are evaluated and compared. It is found that Design C is associated with improved TL by 50% and decreased resonant frequency by 20% comparing with the conventional HR. The present preliminary study shows that Design C is the better design. Further experimental and optimization researches are needed to sheds light on the optimum design of a Helmholtz resonator with neck structure being modified, as there is a low Mach number grazing flow.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-23T04:20:22Z
      DOI: 10.1177/14613484221096232
       
  • Support motion of a finite bar with an external spring

    • Authors: Jeng-Tzong Chen, Hao-Chen Kao, Ying-Te Lee, Jia-Wei Lee
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In this paper, we gave the vibration analysis of a finite bar with an external spring on one side and the support motion on the other side. Two analytical methods, the mode superposition method in conjunction with the quasi-static decomposition method and the method of characteristics using the diamond rule, were employed to solve this problem. Both advantages and disadvantages of two methods were discussed. It is interesting to find that the mode superposition method can capture the silent area in terms of sum of an infinite series while the method of characteristics using the diamond rule can exactly derive the dead zone. Besides, it is found that discontinuities always occur at the location on the characteristic lines. Discussions of direct and inverse problems are also addressed.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-22T11:21:31Z
      DOI: 10.1177/14613484221080346
       
  • The new structures of stochastic solutions for the nonlinear
           Schrödinger’s equations

    • Authors: Mahmoud AE Abdelrahman, Samia Z Hassan, Dana M Alsaleh, Reem A Alomair
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The nonlinear Schrödinger’s equations (NLSEs) is a famous model used to investigate the propagation of optical solitons via nonlinear optical fibers. We applied the unified solver method in order to extract some new stochastic solutions for three types of NLSEs forced by multiplicative noise in Itô sense. The acquired solutions describe the propagation of solitons in nonlinear optical fibers. We exhibit the influence of presence of noise term on the solution for the NLSEs. The theoretical analysis and presented solutions illustrate that the proposed solver is powerful and efficient. Finally, the wave amplitudes may be controlled by the effects performance of physical parameters of the NLSEs in the presence of noise term in Itô sense. Finally, we present He’s frequency formulation.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-22T04:42:28Z
      DOI: 10.1177/14613484221095280
       
  • Static effect of assembled beam bridge under statistical and stable
           traffic flow load

    • Authors: Zufeng Yao, Danhui Dan, Rui Zhao, Shengqiang Ma
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The live load effect of bridge structure caused by traffic flow load is the largest in the sum of all live load effects. Study on the strain and deflection of the assembled beam bridge under the statistical stable traffic flow load can reveal the static effect and dynamic response law of the structure, and then evaluate the service performance of the structure. In this paper, the advanced bridge structure health monitoring technology is used to collect and analyze the traffic flow load parameters. First, according to the probability distribution function of each parameter in the traffic flow load model, the statistical stable traffic flow load is synthesized and the simplified bridge mechanical model is applied. Second, the variance and relative entropy are used to judge the statistical stability of the expectation, variance and probability density function of the static effect. Finally, the evolution law of the expectation, variance and probability density function of the static effect at different locations on the prefabricated beams of the whole bridge deck is analyzed when the static effect reaches the state of statistical stability.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-14T12:06:09Z
      DOI: 10.1177/14613484221091074
       
  • Improved low-frequency sound absorption of porous silicone rubber
           resonance sheet with periodic cavities

    • Authors: Longgui Peng, Pu Zhao, Huanquan Cheng, Qirui He, Lifei Du
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Since the development of advanced sound absorption material is highly critical in noise control applications, anechoic coatings, and acoustic metamaterials, both fabrication technology and structure design are significant in the achievement of broadband and strong absorption performance in the low sound frequency range. In this work, the silicone rubber resonance absorption sheet with periodic cavities is prepared via inserting cylindrical steel strips with different diameters into the non-vulcanized colloid. Effects of size and arrangement of cavities on the sound absorption properties, as well as the corresponding mechanical properties, are investigated and discussed. Results indicate that periodic pattern designs could further improve the low-frequency sound absorption performance of silicone rubber foams, and increasing the cavity diameter could significantly improve the sound absorption efficiency of the prepared samples in the middle- and low-frequency range from 125 to 2000 Hz. Particularly, increasing the number of the layered cavities could also improve the sound absorption efficiency. The consumption of sound energy in the prepared silicone rubber resonance sheet is discussed, which could be attributed to the synergistic effect in different spatial scales.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-13T02:45:21Z
      DOI: 10.1177/14613484211070356
       
  • A hybrid damping control strategy for high-speed trains running on
           existing tracks

    • Authors: Yi Wu, Jing Zeng, Huailong Shi, Bin Zhu, Qunsheng Wang
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      With the rapid development of railways in China, effective coordination of the operation of high-speed trains on existing tracks can bring significant economic benefits to railway transportation. However, high-speed trains running on existing tracks will have to cope with larger track irregularities and navigate smaller curve radii, potentially increasing their vibrations. In order to improve the quality of operation of high-speed trains on existing railways, a self-adjusting hybrid damping control (SAHDC) strategy utilizing a fuzzy controller is adopted in this study. A secondary lateral magnetorheological damper (MRD) is controlled to balance the vibration between the car body, bogie, and wheelset. The MRD behavior is described using a viscoelastic-plastic (VEP) model and nonlinear autoregressive exogenous (NARX) inverse model. A dynamical vehicle model with 50 DOFs is constructed and simulated under different existing track conditions. The results show that the SAHDC can guarantee the required ride quality of the car body, while reducing the vibration of the bogie frame and wheelsets as much as possible during travel on straight and curved tracks and suppressing derailment on turnouts.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-13T02:02:59Z
      DOI: 10.1177/14613484221087513
       
  • Multi-objective optimization of gearbox based on panel acoustic
           participation and response surface methodology

    • Authors: Le Qi, Jianxing Zhou, Huachao Xu
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Aiming at noise problem of two-stage gearbox, this paper uses the panel acoustic contribution analysis (PACA) and response surface methodology to conduct structural-borne acoustics analysis and multi-objective optimization of gearbox. Using this optimization, optimal layout and parameters of the added ribs can be determined. The dynamic model of a spur gear-shaft-bearing system is built in consideration of the time-varying mesh stiffness, the time-varying bearing stiffness, and the flexibility of the shaft, while dynamic load of the bearing is obtained through solving the model. The dynamic load of bearings is considered as excitation to analyze the vibration and noise radiation characteristics of housing. Furthermore, acoustic transfer vector, modal acoustic contribution and PACA are used to select the region with the most acoustic contribution. The variable ribs structure model (VRSM) is established in this region. Finally, the VRSM are adopted to optimize the housing. The optimization model based on the peak sound pressure level (PSPL) and the ribs mass (Rm) is established by using response surface method. Through multi-objective optimization, the variable in VRSM can be modified or deleted to reduce the radiated noise of the gearbox. The optimization results demonstrate that the PSPL after optimization is decreased by 4.88 dB at frequency of 3130 Hz. At the same mass, the noise reduction effect of VRSM is 12% higher than that of standard rib. Therefore, the optimization effect of the housing structure is obvious. PACA-VRSM-RSM- NSGA-II technology provides a new research scheme for reducing the vibration and noise of the gearbox.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-12T03:26:18Z
      DOI: 10.1177/14613484221091075
       
  • Formation of electrostatic solitary and periodic waves in dusty plasmas in
           the light of Voyager 1 and 2 spacecraft and Freja satellite observations

    • Authors: Muhammad Shohaib, Waqas Masood, Mohsin Siddiq, Haifa A Alyousef, Samir A. El-Tantawy
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Motivated by the observations of Voyager 1 and 2 spacecraft and Freja satellite observations in Saturn’s magnetosphere, the formation of dust-acoustic (DA) localized and periodic waves in a complex plasma having superthermal electrons and ions are reported. In this regard, a modified Kadomtsev–Petviashvili (mKP) equation is derived by employing the weak turbulence theory for studying the characteristics of the nonlinear dust-acoustic waves (DAWs) in the model under consideration. The localized and periodic wave solutions to the mKP equation are derived using ansatz method in terms of Jacobi elliptic functions (JEFs). It is reported that the phase velocity of the DAWs in the Saturn’s magnetosphere is lower for kappa distributed ions and electrons by comparison with regions of space plasmas where the electrons and ions follow the Maxwellian distribution. The conditions for the existence of both localized and periodic waves are also presented. Estimates are also given of the spatial scales over which the dust-acoustic solitary/periodic structures form in Saturn’s magnetosphere.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-12T01:04:23Z
      DOI: 10.1177/14613484221091340
       
  • Synchronization behaviors of a vibrating mechanical system with adjustable
           frequencies and motion trajectories

    • Authors: Xueliang Zhang, Wei Zhang, Weihao Chen, Wenchao Hu, Xu Zhang, Bang-Chun Wen
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In present work, the double and triple-frequency synchronization behaviors of a vibrating mechanical system with two different driving frequencies, driven by three reversed rotating exciters, are investigated by theory, numeric, and experiment. Based on Lagrange’s equations, the dynamic model corresponding to vibrating machine is proposed and motion differential equations are constructed. The Bogoliubov standard formal equations for three exciters are established, by introducing the asymptotic method, in which the synchronization problem is converted into that of the existence and stability of zero-valued solution of the average differential equations. The synchronization criterion of satisfying the synchronous operation is deduced. According to the Routh–Hurwitz criterion, the stability criterion of the synchronous states is achieved analytically. Based on the obtained theory results, the stability characteristics of the system, are numerically discussed in detail, including the stability ability coefficients and stable phase differences. Finally, simulations and experiments under the condition of two different driving frequencies, are performed to further examine the validity of the theoretical and numerical qualitative results. The present work can provide a theoretical reference for designing some new types of the vibrating machines with adjustable frequencies and motion trajectories.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-11T09:07:34Z
      DOI: 10.1177/14613484221075124
       
  • Analysis of sound transmission loss characteristics of aircraft composite
           panel under variable temperature environment

    • Authors: Tao Peng, Ningjuan Dong, Qun Yan
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      An improved sound transmission loss (STL) experimental technique based on the sound pressure method (SPM) and acoustic box method is proposed to investigate the temperature influence on the STL of the ribbed carbon fiber reinforced plastics aircraft panel. SPM principle is given. The measurement procedure of the improved STL technique is presented and its reliability is verified. STL variable characteristics of the panel within −40°C–40°C were measured. Results showed that temperature had a significant effect on the panel’s STL. The overall STL varied nonlinearly with temperature, whereas STL exhibited a fluctuation or monotony trend at a single center frequency. Temperature variation caused changes of STL peak/dip frequencies and redistribution of stiffness-controlled, resonance-controlled, coincidence-controlled, and damping-controlled regions. The causes of the aforementioned are given. This study reveals the relationship between temperature, thermomechanical parameters and STL. The findings have applications in the design, measurement, analysis, and theoretical development of composite structure acoustics.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-04-04T06:23:25Z
      DOI: 10.1177/14613484221088139
       
  • Fault diagnosis for vehicle air conditioning blower using deep learning
           neural network

    • Authors: Jian-Da Wu, Jun-Yuan Ke, Fan-Yu Shih, Wen-Jye Shyr
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This study presents a fault diagnosis system for vehicle heating, ventilation and air conditioning (HVAC) acoustic signal with various feature extractions in deep learning neural network. Traditionally, sound used for fault diagnosis or signal classification is observed the difference of energy in time or frequency domains. Unfortunately, the frequency smearing effect often arises in some critical conditions. In the present study, discrete wavelet transform (DWT) and wavelet packet transform (WPT) are proposed in fault diagnosis. Meanwhile, when using mechanical learning methods, the data are relatively large, in order to reduce the amount of data, DWT and WPT low-frequency decomposition could be used to improve the performance. Furthermore, the signal characteristics more comprehensive, this study attempts to use the feature extraction method of wavelet packet conversion to improve the signal characteristics. In the experiment process, the operation state of the blade blower in the vehicle air conditioner, four different faults were designed, test database was established through sound to classify, and identify the data using deep neural networks to achieve the purpose of blower fault diagnosis. In data analysis, the original signal is presented through wavelet packet decomposition and discrete packet conversion technology, compared with traditional time and frequency domain signals to explore the identification rate, identification speed and related issues. Experimental results show that using WPT combined with deep neural networks have good fault diagnosis and discrimination capabilities, training, and identification time is shorter than time-frequency domain signals.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-30T05:14:42Z
      DOI: 10.1177/14613484221085891
       
  • Natural vibrations of double bi-directional functionally graded
           Euler–Bernoulli beams connected by a variable Winkler elastic layer

    • Authors: Ma’en S Sari
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The free transverse vibrations of two-dimensional functionally graded double Euler–Bernoulli beam system connected through a variable Winkler elastic layer are presented. The Modulus of elasticity and the density of the material of the beams are assumed to vary along the thickness and the length of the beams according to power-law and exponential functions, respectively. The governing differential equations of motion are established by the means of Hamilton’s principle. The Chebyshev Spectral Collocation Method (CSCM) is used to calculate the natural frequencies of the two-dimensional functionally graded (2D-FG) double beams. The effects of several parameters such as the height ratio of the beams, the stiffness of the coupling layer, the axial and transverse functionally graded indexes, and the boundary conditions on the natural frequencies of the 2D-FG double beams have been investigated. The frequencies obtained from the CSCM have been validated by comparing them with those available in previous literature.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-29T05:29:27Z
      DOI: 10.1177/14613484221085887
       
  • Recent strategy to study fractal-order viscoelastic polymer materials
           using an ancient Chinese algorithm and He’s formulation

    • Authors: Alex Elías-Zúñiga, Luis M Palacios-Pineda, Daniel Olvera-Trejo, Oscar Martínez-Romero
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper introduces a novel methodology to determine the frequency-amplitude relationship of fractal-order viscoelastic polymer materials using the two-scale fractal dimension transform, the equivalent power-form representation of the conservative restoring forces, and a simple coordinate transformation to eliminate viscoelastic effects. Then, the ancient Chinese algorithm Ying Bu Zu Shu and He’s formulation are used for obtaining the frequency-amplitude relationship. Simulation results obtained from the derived expressions exhibit good agreement when compared to numerical integration solutions. This article elucidates how the molecular structure of polymer chains influences the relaxation oscillations as a function of the fractal parameter values.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-29T03:23:46Z
      DOI: 10.1177/14613484221085413
       
  • Vibration reduction and isolation performance of a platform foundation and
           column base of an ancient wooden structure based on the energy transfer
           analysis

    • Authors: Cheng Zhang, Nan Zhang, Juan Wang, JinBao Yao
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Wooden structures, as the most representative structural types of the ancient Chinese architecture, are very common and have a long history. The special construction methods adopted in ancient wooden structures, such as the platform foundations and plinth connections, enabled the ancient buildings to stand for thousands of years. However, research on the vibration reduction and isolation of the unique structures is insufficient. Thus, this paper investigates the vibration reduction and isolation performance of the platform foundation and column base of ancient wooden buildings, taking the 1500-year-old Feiyun wooden pavilion as a case study. First, using the acceleration RMS, the traffic-induced vibrations were analyzed in the time domain. It was found that the platform foundation tends to amplify the horizontal vibrations, while the column base tends to reduce them. Furthermore, background vibrations were eliminated from the measured data by using the principle of energy conservation. A frequency domain analysis of the processed data showed that the horizontal traffic-induced vibrations below 16 Hz were reduced by the platform foundation, and the column base had an obvious effect on the vibration reduction and isolation below 40 Hz. Both the platform foundation and the column base demonstrated a good effect on the reduction of traffic-induced vibrations in the vertical direction. The reported research results can be used as a basis for further studies on the dynamic performance of ancient wooden structures.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-27T10:39:18Z
      DOI: 10.1177/14613484221082635
       
  • Vibration characteristics of channel steel-concrete composite girders: An
           experimental and numerical analysis

    • Authors: Xun Zhang, Ziqi Liu, Derui Kong, Tao Chen, Jinrui Zhang
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The broad application of steel and steel-concrete bridges has caused significant vibration and noise problems. Although the channel steel-concrete composite girder is a commonly used bridge type, the vibration transmission performance and structural optimization design (concrete deck, stiffeners, transverse connection components, etc.) from the perspective of vibration control have not been well studied. In this paper, experimental and numerical approaches are combined to investigate the dynamic properties of a steel-channel girder in the audible frequency range (20–2000 Hz). A steel-channel girder is tested via hammering. The effects of damping, stiffeners, and a concrete deck on structural vibration are evaluated using the finite element method. The experimental results indicate negligible differences in the vibration responses on a single plate, but large differences at different sections. The results are influenced by the effects of the distance and transmission path. The numerical results reveal that increasing the damping and stiffness (e.g., setting stiffeners) are both effective in reducing vibrations. Furthermore, increasing the stiffness has a more prominent effect on structural vibrations and their frequency dependence, whereas increasing the damping ratio can stably reduce structural vibrations. The simulation results indicate that installing a concrete deck is the most effective approach to vibration reduction, as it can decrease overall vibration by more than 10 dB. Vertical web stiffeners have stronger effects on vibration reduction than other stiffening countermeasures (e.g., transverse connection components and longitudinal bottom plate stiffeners).
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-27T10:10:01Z
      DOI: 10.1177/14613484221086373
       
  • Soliton wave solutions of ion-acoustic waves a cold plasma with negative
           ions

    • Authors: Dexu Zhao, Dianchen Lu, Samir A Salama, Piyaphong Yongphet, Mostafa MA Khater
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This article investigates the computational complex wave solutions of the modified Korteweg–de Vries equation combined with an adverse order of the Korteweg–de Vries model. This model was derived in 2017, where the recursion and inverse recursion operators are employed to select the integrable merged MKdV with a negative MKdV model. This integrable property is tested utilizing the Painlevé property. Verosky gave the description and properties of the opposing order recursion operator. We handle this model by implementing eleven contemporary techniques. We obtain a novel formula of complex solitary wave solutions for this model. Complex solitary wave solutions describe wave propagation, and it is also considered more mathematically concise tools to explain more details about the physical properties of models. The main goals of our paper are a comparison between these methods and introducing a novel modified method. All solutions are checked for accuracy by putting them back into the model via two different software (Maple 17 and Mathematica 12).
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-25T04:39:00Z
      DOI: 10.1177/14613484221074747
       
  • A hybrid acoustic structure for low-frequency and broadband underwater
           sound absorption

    • Authors: Xinyu Jia, Guoyong Jin, Kangkang Shi, Chunyang Bu, Tiangui Ye
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The underwater anechoic coating with local resonant units is an effective method to achieve low-frequency sound absorption. However, the structure obtained in this way is not satisfactory in the sound absorption effect of mid-high frequency bands. Capitalizing on the impedance gradient characteristics of functionally graded materials (FGMs) can improve the impedance matching between the structure and the medium, and enhance the dissipation of sound waves inside the structure. Based on these, we propose an underwater acoustic structure, which can improve and obtain low-frequency and broadband sound absorption performance by embedding local resonators into FGMs. To reveal the sound-absorbing mechanism and further optimize the low-frequency absorption performance of the structure, we conduct quantitative analyses on the parameters of FGMs, the materials and forms of resonators. The results indicate that by appropriately adjusting the studied parameters, different low-frequency sound-absorbing peak can be obtained and the absorption effects are also further improved.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-14T08:39:16Z
      DOI: 10.1177/14613484221081846
       
  • Study on sound absorption performance of resonance structure for
           aluminum–polyurethane foam composite and plexiglass

    • Authors: Binxia Yuan, Xinyi Fang, Jianben Liu, Rui Zhu, Lan Cao
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Low-frequency noise control in substations (converter stations) has received extensive attention. The sound absorption performance of a single material is limited. In the paper, aluminum–polyurethane (Al–PU) foam composite materials were prepared by impregnating method. The microstructure and composition of PU and Al–PU composite foam were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that aluminum particles can be well adhered to the skeleton of PU foams, and the sound absorption coefficient of Al–PU foams at 50 Hz–315 Hz was greatly improved. Meanwhile, the resonance structures of Al–PU foams and plexiglass were further constructed. The sound absorption coefficient of different resonance structures was different, and the performance of the resonance structure with 10 mm back cavity and front hole was the best.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-12T10:54:06Z
      DOI: 10.1177/14613484211069807
       
  • Free vibration of a taut cable with a parallel-connected viscous mass
           damper and a grounded cross-tie

    • Authors: Xin Li, Zhi-peng Cheng, Zhi-hao Wang, Bu-qiao Fan
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Recent studies have shown that the combination of external dampers and cross-ties can overcome their respective deficiencies while retaining their respective merits. Inspired by the advantages of a viscous damper (VD) and a cross-tie on a single stay cable, the coupled damping effect of a parallel-connected viscous mass damper (PVMD) and a grounded cross-tie on a single stay cable is investigated in this paper. The complex wave number equations of the cable–PVMD–cross-tie system are first formulated through the complex modal analysis. Subsequently, the asymptotic and iterative complex wave numbers are compared to evaluate the applicability of the asymptotic and iterative solutions. Furthermore, parametric studies are carried out to investigate the effects of the stiffness coefficients and the installation positions of the cross-tie on the first supplemental modal damping ratio and frequency of the cable. Finally, the installation positions of the cross-tie are optimized to achieve the optimal vibration control of the cable with the PVMD and the cross-tie.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-04T12:56:06Z
      DOI: 10.1177/14613484221075445
       
  • Controlling the kinematics of a spring-pendulum system using an energy
           harvesting device

    • Authors: Chun-Hui He, Tarek S Amer, Dan Tian, Amany F Abolila, Abdallah A Galal
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This work focuses on vibration alleviation and energy harvesting in a dynamical system of a spring-pendulum. The structure of the pendulum is modified using an independent electromagnetic harvesting system. The harvesting depends on the oscillation of a magnet in a coil. An endeavor has been made to get both the energy harvesting and mitigation of vibration efficacy of the harvester. The governing kinematics equations are derived using Lagrange’s equations and are solved asymptotically using the multiple scales method to achieve the intended outcome as new and precise results. The resonance states are classified, and the influence of various parameters of the studied system is analyzed. Fixed points at steady states are categorized into stable and unstable. The time behavior of the solutions, the modified amplitudes, and phases are examined and interpreted in the light of their graphical plots. Zones of stability and instability are concerned, in which the system’s behavior is stable for a wide range of used parameters. This model has become essential in recent times as it uses control sensors in industrial applications, buildings, infrastructure, automobiles, and transportation.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-01T11:54:21Z
      DOI: 10.1177/14613484221077474
       
  • Effect of time-delay feedback control on vehicle seat vibration reduction
           and suspension performance

    • Authors: Kehui Ma, Yongguo Zhang, Chuanbo Ren, Yajie Chen, Pengcheng Zhou, Yuanchang Chen
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      To reduce seat vibration caused by uneven road surfaces, the time-delay feedback control into the seat suspension system was introduced and an active seat suspension control method based on time-delay feedback was proposed in this paper. A three-degree-of-freedom (3-DOF) suspension model with time-delay feedback control was established. The time-delay independent stability region and critical stability curve of the system were derived using the method of characteristic root and stability switching. The effect of feedback control parameters on system vibration was investigated in the stability region. The seat acceleration (SA), body acceleration (BA), suspension dynamic deflection (SDD), and tire dynamic displacement (TDD) were used as multi-objective optimization functions and the optimal values of feedback control parameters were obtained based on the particle swarm algorithm (PSO) with above optimization functions. The numerical simulation was conducted to validate the proposed model. The simulated results show that the time-delay feedback control can significantly suppress the vibration response of the seat and effectively improve the suspension performance under different road excitation compared with the passive suspension. It can be seen that the active seat suspension with time-delay control significantly improve ride comfort and handling stability of the vehicle, which can be used as a reference for the active control technology of vehicle suspension.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-02-28T01:13:11Z
      DOI: 10.1177/14613484221076724
       
  • Using viscous resistance system based on machine learning in engineering
           concrete structures

    • Authors: Thanh Q Nguyen
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Through the combination of two approaches to evaluating structure change, a structural model and an unstructured model, a constructed model has been proposed in this article that evaluates structural change through the expansion of a linear model following the Hooke’s Law principle. The study has relied on the pure compression model of a structure’s concrete beam with elastic modulus (E) and has added the coefficient of viscosity resistance (C) to suggest a new evaluation method. By defining the aggregation of values of both coefficients C and E through the experimental model, the input parameters are the amplitude values of the vibration spectra and the values of frequencies based on machine learning, through which ZEC values are generated. The ZEC values determine a regression plane accumulated from the aggregation of values for both C and E. The article has introduced the ZEC concept as a useful parameter for the assessment of the quality of concrete structures by the nonlinear model with the appearance of the coefficient C. The results show that the ZEC values have expressed the distribution validity according to the structure’s differing degrees of change. Depending on the texture type and the structure status, these ZEC values will form different shapes. By implementing the actual surveys from many bridges with two types of beam structures, prestressed concrete and conjugated concrete, the ZEC values show the same development trend. On the contrary, in the case of a change in mechanical structure, the ZEC values tend to increase. This evidence proves, in regard to the process of structural change, that the larger the changes in the structure, the more pronounced the distribution of ZEC values, and the wider the distribution range. This shows that the ratio of the damping coefficient C to the elastic modulus E will become increasingly unstable as the structure becomes weaker and weaker. In the future, the results from this study can be applied in the assessment of many types of actual structures.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-02-24T04:34:54Z
      DOI: 10.1177/14613484211072366
       
  • Study on nonlinear vibration of flexible electronic membrane engendered by
           high-precision imprinting system

    • Authors: Yao Feng, Jimei Wu, Yan Wang, Mingyue Shao
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In the process of guide roller transmission, the geometric nonlinearity caused by the lateral vibration of the flexible electronic membrane will result in the divergence and instability of the membrane velocity, thus affecting the printing accuracy. In this paper, in order to engineer the exact condition that affecting the printing accurancy, the Elliptic integral method, whose effectiveness has been verified for its soluted result, is consistent with the one concluded from L-P method and He's Frequency formula while soluting the nonlinear vibration equation, respectively, on basis of Von Karman’s large deflection theory and Hamilton’s principle, is mainly applied, and thus provide a theoretical support for the design and manufacture of high-precision flexible electronic printing press.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-02-22T11:52:11Z
      DOI: 10.1177/14613484221075438
       
  • New analytical solution of the fractal anharmonic oscillator using an
           ancient Chinese algorithm: Investigating how plasma frequency changes with
           fractal parameter values

    • Authors: Alex Elías-Zúñiga, Oscar Martínez-Romero, Luis M Palacios-Pineda, Daniel Olvera-Trejo
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      This paper uses the two-scale fractal dimension transform and He’s formula derived from the ancient Chinese algorithm Ying Bu Zu Shu to find the approximate frequency–amplitude expression of the fractal and forced anharmonic oscillator that can be used to study the nonlinear oscillations produced by the plasma physics fractal structures. The results show how the electron frequency and wavelength change as a function of the plasma physics fractal structure. In fact, if the value of the fractal parameter is decreased, the wavelength increases, and consequently, the system frequency decreases. The introduced solution procedure sheds a bright light on the easy-to-follow steps to obtain an accurate steady-state analytical solution of fractal anharmonic nonlinear oscillators.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-02-10T11:56:02Z
      DOI: 10.1177/14613484211070883
       
  • Mutual-radiation efficiency estimation of vibration modes by finite
           element method and boundary element method software

    • Authors: Lai Wei, Sheng Li
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      When the structure is forced to vibrate and multiple modes exist simultaneously, each vibration mode contributes to the total acoustic power radiated by the structure. Moreover, the acoustic radiation of each vibration mode is not independent of each other, and the coupling between them will also have an impact on the total radiated power. Mutual-radiation efficiency is an important metric to measure the ability of the coupling of different modes to radiate. In this note, for both real and complex modes, a method to calculate the mutual-radiation efficiencies by finite element method and boundary element method software is presented. Numerical examples are presented to illustrate and validate the approach.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-01-25T04:52:12Z
      DOI: 10.1177/14613484211073274
       
  • Novel and accurate solitary wave solutions of the conformable fractional
           nonlinear Schrödinger equation

    • Authors: Dexu Zhao, Dianchen Lu, Samir A Salama, Piyaphong Yongphet, Mostafa MA Khater
      First page: 488
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      In this paper, the Khater II analytical technique is used to examine novel soliton structures for the fractional nonlinear third-order Schrödinger (3-FNLS) problem. The 3-FNLS equation explains the dynamical behavior of a system’s quantum aspects and ultra-short optical fiber pulses. Additionally, it determines the wave function of a quantum mechanical system in which atomic particles behave similarly to waves. For example, electrons, like light waves, exhibit diffraction patterns when passing through a double slit. As a result, it was fair to suppose that a wave equation could adequately describe atomic particle behavior. The correctness of the solutions is determined by comparing the analytical answers obtained with the numerical solutions and determining the absolute error. The trigonometric Quintic B-spline numerical (TQBS) technique is used based on the computed required criteria. Analytical and numerical solutions are represented in a variety of graphs. The strength and efficacy of the approaches used are evaluated.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-11T10:18:56Z
      DOI: 10.1177/14613484211068962
       
  • Modal analysis and demonstration of metastructure combining local
           resonators and an autonomous synchronized switch damping circuit

    • Authors: Haruhiko Asanuma, Sumito Yamauchi
      First page: 540
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      A locally resonant metastructure is a promising approach for low-frequency vibration attenuation, whereas the attachment of many resonators results in unnecessary and multiple resonance outside the bandgap. To address this issue, we propose a damping metastructure combining local resonators and an autonomous synchronized switch damping circuit. On the basis of modal analysis, we derive an electromechanically coupled equation of the proposed metastructure. The piezo ceramics, which are attached on a small portion of the metastructure and connected to the circuit, remarkably decrease the magnitude of the resonant vibration with no extra sensors, signal processors, or power sources. The displacement at unnecessary resonance was decreased by approximately 75%. The results of the coupled analysis were similar to the experimentally observed results in terms of the location and width of the bandgap on the frequency axis and the decreased displacement for the circuit. The proposed technique can overcome the disadvantage of the metastructure.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-01-06T07:25:03Z
      DOI: 10.1177/14613484211068244
       
  • Fast identification of the pull-in voltage of a
           nano/micro-electromechanical system

    • Authors: Ji-Huan He, Na Qie, Chun-Hui He, Khaled Gepreel
      First page: 566
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The pull-in voltage is crucial in designing an optimal nano/micro-electromechanical system (N/MEMS). It is vital to have a simple formulation to calculate the pull-in voltage with relatively high accuracy. Two simple and effective methods are suggested for this purpose; one is an ancient Chinese algorithm and the other is an extension of He’s frequency formulation.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-01-04T07:41:18Z
      DOI: 10.1177/14613484211068252
       
  • Parameter optimization of a grounded dynamic vibration absorber with lever
           and inerter

    • Authors: Aimei Shi, Yongjun Shen, Junfeng Wang
      First page: 784
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      Mechanical vibration is mostly harmful, and it may not only generate noise but also affect the working life of the equipment. Lever, inerter, and grounded stiffness have good performance in the field of vibration control, but the dynamic vibration absorber simultaneously containing lever, inerter, and grounded stiffness is rarely studied. Based on the grounded dampertype dynamic vibration absorber, a dynamic vibration absorber with lever, inerter, and grounded stiffness is presented. And the optimal system parameters are analytically researched in detail. Firstly, the differential equation of motion is established according to Newton’s second law, and the analytical solution of the system is obtained. According to the amplitudefrequency curve of the system, it is obvious that there are two fixed points unrelated to the damping ratio. Meanwhile, the optimal frequency ratio of the dynamic vibration absorber is obtained based on the fixed-point theory. Under the premise of ensuring the system stability, the optimal grounded stiffness ratio is screened out, and the working range of inerter is further calculated. It is found that the inerter ratio has two working ranges when the coupling term values of magnification ratio and mass ratio are different. Furthermore, the approximate optimal damping ratio is derived by minimizing the maximum value of the amplitudefrequency curve. Using MATLAB, the numerical result is analyzed, and the correctness of analytical results is verified. Compared with other dynamic vibration absorbers under harmonic and random excitations, it is known that the model in this paper can evidently reduce the resonance amplitude and broaden the vibration band of the primary system. These results may provide a theoretical basis for the optimal design of similar dynamic vibration absorbers.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-30T06:37:37Z
      DOI: 10.1177/14613484211068250
       
  • Flexural wave band gaps of steel bridge decks periodically stiffened with
           U-ribs: Mechanism and influencing factors

    • Authors: Xun Zhang, Chenxi Hao, Hao Luo, Derui Kong, Cong Li
      First page: 799
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      To effectively and efficiently control vibrations in steel bridge decks, the flexural wave band gap and vibration attenuation mechanism are studied. The band structures and displacement fields of the eigenmodes at the band gap edges of infinite periodic U-rib stiffened plates are calculated. The calculation method is combining the finite element method with Bloch periodic boundary conditions. A scaled specimen test of a finite periodic U-rib stiffened plate is used to validate the numerical results. A comparison of results confirms that introducing the U-rib allows the periodic U-rib stiffened plates to yield several flexural wave band gaps. In the band gaps, flexural wave propagation is stopped and clear flexural vibration suppression is achieved. Furthermore, the effects of geometric parameters and structural schemes on the flexural wave band gaps are analyzed in detail. Finally, by analyzing a specific case, it is demonstrated that the flexural wave band gaps and vibration attenuation properties can be controlled. This provides a new approach to vibration and noise control in steel bridges.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-28T07:43:19Z
      DOI: 10.1177/14613484211068251
       
  • A study on the conversion relationship of noise perceived annoyance and
           psychoacoustic annoyance—a case of substation noise

    • Authors: Di Guoqing, Chen Cong, Yao Yao, Dong Li, Wu Jian
      First page: 810
      Abstract: Journal of Low Frequency Noise, Vibration and Active Control, Ahead of Print.
      The level of annoyance is an important basis to determine the acceptable degree of noise and develop noise standards. Psychoacoustic annoyance (PA) calculated by Zwicker’s model and perceived annoyance (such as mean annoyance, MA and the percentage of highly annoyed population, %HA) obtained through individual self-reports are widely used. PA and MA (or %HA) cannot be directly compared because the ranges of their values are different. Thus, the conversion relationship of PA and MA (or %HA) needs to be developed. As a case study, the model between PA and MA (or %HA) of substations noise was established and the rationality of model was verified. Results showed that the maximum value of the difference of MA (or %HA) between the calculation result of model and experimental result was less than 0.89 (or 15%). In this way, the perceived annoyance of substation noise samples can be determined by calculation without experiments.
      Citation: Journal of Low Frequency Noise, Vibration and Active Control
      PubDate: 2022-03-13T05:48:08Z
      DOI: 10.1177/14613484211068308
       
 
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