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  Subjects -> ENGINEERING (Total: 2244 journals)
    - CHEMICAL ENGINEERING (187 journals)
    - CIVIL ENGINEERING (179 journals)
    - ELECTRICAL ENGINEERING (97 journals)
    - ENGINEERING (1205 journals)
    - ENGINEERING MECHANICS AND MATERIALS (375 journals)
    - HYDRAULIC ENGINEERING (53 journals)
    - INDUSTRIAL ENGINEERING (61 journals)
    - MECHANICAL ENGINEERING (87 journals)

ENGINEERING (1205 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Production and Operations Management     Hybrid Journal   (Followers: 9)
Production Engineering     Hybrid Journal   (Followers: 3)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 7)
Progress in Agricultural Engineering Sciences     Full-text available via subscription  
Progress in Computational Fluid Dynamics, An International Journal     Hybrid Journal   (Followers: 6)
Progress in Energy and Combustion Science     Full-text available via subscription   (Followers: 8)
Progress in Nanotechnology and Nanomaterials     Open Access   (Followers: 4)
Progress in Photovoltaics: Research & Applications     Hybrid Journal   (Followers: 7)
Progress in Polymer Science     Full-text available via subscription   (Followers: 32)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 227)
Propulsion and Power Research     Open Access   (Followers: 15)
Purinergic Signalling     Hybrid Journal   (Followers: 1)
Quaderns d’Història de l’Enginyeria     Open Access  
Quality and Reliability Engineering International     Hybrid Journal   (Followers: 11)
Quality Engineering     Hybrid Journal   (Followers: 7)
Radiochimica Acta     Hybrid Journal   (Followers: 4)
Rapid Prototyping Journal     Hybrid Journal   (Followers: 3)
Rare Metals     Hybrid Journal  
Reactive and Functional Polymers     Hybrid Journal   (Followers: 5)
Recent Patents on Engineering     Full-text available via subscription   (Followers: 2)
Recent Patents on Nanotechnology     Full-text available via subscription   (Followers: 2)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Redes de Ingeniería     Open Access  
Regional Maritime University Journal     Full-text available via subscription   (Followers: 1)
Regular and Chaotic Dynamics     Hybrid Journal  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 16)
Remote Sensing Letters     Hybrid Journal   (Followers: 14)
Requirements Engineering     Hybrid Journal   (Followers: 3)
Research Ideas and Outcomes     Open Access  
Research in Engineering Design     Hybrid Journal   (Followers: 10)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 2)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 21)
Review of Symbolic Logic     Full-text available via subscription   (Followers: 1)
Reviews in Advanced Sciences and Engineering     Partially Free   (Followers: 1)
Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica     Open Access  
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1)
Revista Ciencias e Ingeniería al Día     Open Access  
Revista Científica e-Locução     Open Access  
Revista CINTEX     Open Access  
Revista Cubana de Ingeniería     Open Access  
Revista de Engenharia da Universidade Católica de Petrópolis     Open Access  
Revista de Ingeniería     Open Access  
Revista de Ingenieria Sismica     Open Access  
Revista de Investigación, Desarrollo e Innovación     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista Facultad de Ingeniería     Open Access   (Followers: 1)
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access  
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1)
Revista Iberoamericana de Automática e Informática Industrial RIAI     Open Access  
Revista Informador Técnico     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access  
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
Revue de Métallurgie     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 25)
Russian Microelectronics     Hybrid Journal  
Sadhana     Open Access   (Followers: 4)
Safety Science     Hybrid Journal   (Followers: 16)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 2)
Science & Technique     Open Access  
Science and Engineering Ethics     Hybrid Journal   (Followers: 6)
Science and Technology     Open Access   (Followers: 2)
Science China Technological Sciences     Hybrid Journal  
Science in Context     Hybrid Journal   (Followers: 1)
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 3)
Scientia cum Industria     Open Access  
Scientific Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     Open Access  
Scientific Journal of Review     Open Access  
Sealing Technology     Full-text available via subscription   (Followers: 1)
Securitas Vialis     Hybrid Journal  
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 19)
Semiconductors     Hybrid Journal  
Semiconductors and Semimetals     Full-text available via subscription  
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 1)
Sensor Letters     Full-text available via subscription   (Followers: 1)
Sensors     Open Access   (Followers: 10)
Separation and Purification Technology     Hybrid Journal   (Followers: 10)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Shock and Vibration     Hybrid Journal   (Followers: 6)
SIAM Journal on Applied Dynamical Systems     Full-text available via subscription   (Followers: 2)
SIAM Journal on Mathematical Analysis     Full-text available via subscription   (Followers: 3)
SIAM Journal on Matrix Analysis and Applications     Full-text available via subscription   (Followers: 1)
SIAM Journal on Numerical Analysis     Full-text available via subscription   (Followers: 4)
SIAM Journal on Optimization     Full-text available via subscription   (Followers: 6)
SIAM Review     Full-text available via subscription   (Followers: 5)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 1)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 3)
Small     Hybrid Journal   (Followers: 8)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 6)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 33)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 8)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 7)
SourceOCDE Developpement urbain, rural et regional     Full-text available via subscription  
SourceOCDE Energie     Full-text available via subscription  
SourceOECD Energy     Full-text available via subscription  
SourceOECD Science and Technology Statistics - SourceOCDE Base de donnees des sciences et de la technologie     Full-text available via subscription  
SourceOECD Transport     Full-text available via subscription   (Followers: 3)
SourceOECD Urban, Rural and Regional Development     Full-text available via subscription   (Followers: 1)
South African Computer Journal     Full-text available via subscription  
South African Journal of Agricultural Extension     Open Access   (Followers: 3)
South African Journal of Science     Open Access   (Followers: 3)
Sports Engineering     Hybrid Journal   (Followers: 2)
Stahlbau     Hybrid Journal   (Followers: 4)
Steel in Translation     Hybrid Journal  
Steel Research International     Hybrid Journal   (Followers: 28)
Stochastic Analysis and Applications     Hybrid Journal  
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 4)
Stochastics and Dynamics     Hybrid Journal  
Strain     Hybrid Journal   (Followers: 1)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Studies in Engineering and Technology     Open Access  
Studies in Interface Science     Full-text available via subscription   (Followers: 1)
Studies in Logic and Practical Reasoning     Full-text available via subscription  
Studies in Surface Science and Catalysis     Full-text available via subscription   (Followers: 1)
Superconductor Science and Technology     Hybrid Journal  
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 14)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 2)
Sustainability Science     Hybrid Journal   (Followers: 5)
Sustainability Science and Engineering     Full-text available via subscription   (Followers: 4)
Sustainable Management of Sediment Resources     Full-text available via subscription  
Swiss Journal of Geosciences     Hybrid Journal  
Symmetry     Open Access  
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription  
Synthesis Lectures on Antennas     Full-text available via subscription   (Followers: 3)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 3)
Synthesis Lectures on Energy and the Environment: Technology, Science, and Society     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Engineering     Full-text available via subscription  
Synthesis Lectures on Global Engineering     Full-text available via subscription  
Synthesis Lectures on Professionalism and Career Advancement for Scientists and Engineers     Full-text available via subscription  
Synthetic Metals     Hybrid Journal   (Followers: 4)
Systems Engineering     Hybrid Journal   (Followers: 6)
Systems Engineering Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 3)
Techno.Com     Open Access  
Technological Engineering     Open Access  
Technologies     Open Access   (Followers: 1)
TECHNOLOGY     Hybrid Journal  
Technology and Innovation     Full-text available via subscription   (Followers: 3)
Technology in Society     Hybrid Journal   (Followers: 4)
Technometrics     Full-text available via subscription   (Followers: 6)
Tecnologia, Ciencia, Educacion     Open Access   (Followers: 1)
Tecnura     Open Access  
Telecommunications Policy     Hybrid Journal   (Followers: 8)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 1)
Textile Science and Technology     Full-text available via subscription   (Followers: 3)
The Journal of Computational Multiphase Flows     Full-text available via subscription  
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 9)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 2)
Thermal Engineering     Hybrid Journal   (Followers: 3)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 1)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 41)
TRANSACTIONS of the VŠB - Technical University of Ostrava, Safety Engineering Series     Open Access   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Transport and Telecommunication Journal     Open Access   (Followers: 3)
Transport World Africa     Full-text available via subscription   (Followers: 3)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 33)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 5)
Trends in Applied Sciences Research     Open Access   (Followers: 1)
Tribology in Industry     Open Access   (Followers: 1)
Tribology International     Hybrid Journal   (Followers: 41)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 33)
Tribotest     Hybrid Journal  
Tropical Science     Hybrid Journal   (Followers: 1)
Turkish Journal of Engineering and Environmental Sciences     Open Access   (Followers: 1)
Ultramicroscopy     Hybrid Journal   (Followers: 2)
Uludağ University Journal of The Faculty of Engineering     Open Access  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Universal Journal of Engineering Science     Open Access   (Followers: 1)
Utilities Policy     Hybrid Journal   (Followers: 2)
Vacuum     Hybrid Journal   (Followers: 12)
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 3)
Visualization in Engineering     Open Access  
Walailak Journal of Science and Technology     Open Access  
Waste and Biomass Valorization     Hybrid Journal  
Waste Management Series     Full-text available via subscription   (Followers: 2)
Waves in Random and Complex Media     Hybrid Journal  
Wear     Hybrid Journal   (Followers: 29)
Welding in the World     Hybrid Journal   (Followers: 2)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 8)
World Journal of Engineering     Full-text available via subscription   (Followers: 3)

  First | 1 2 3 4 5 6 7 | Last

Journal Cover Journal of Dynamic Systems, Measurement, and Control
  [SJR: 0.66]   [H-I: 57]   [11 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 1528-9028 - ISSN (Online) 0022-0434
   Published by ASME International Homepage  [25 journals]
  • Nonlinear Control Scheme for the Levitation Module of Maglev Train
    • Authors: He G; Li J, Cui P.
      Abstract: In this study, we investigate a nonlinear control scheme to solve the practical issues such as inner coupling, load uncertainties, and model errors in the suspension control of maglev train. By considering the levitation module as an integral controlled object, the mathematical model of the levitation module is obtained. The inverse system method is adopted to deal with the inner coupling in the levitation module. By this way, the levitation module system is divided into two linear decoupled subsystems. Then, the linear quadratic regulator (LQR) theory is employed for achieving steady suspension. Besides, a disturbance nonlinear observer is designed to compensate the influence of load uncertainties and model errors. Furthermore, the availability of the proposed control scheme is validated through simulations and experimental results.
      PubDate: Mon, 16 May 2016 00:00:00 GMT
       
  • Chattering-Free Error Integral Driven MIMO Sliding Mode Regulator for
           Linear Time-Invariant Systems
    • Authors: Yunt K.
      Abstract: In this work, an error-integral-driven sliding mode controller (EID-SMC) is discussed for multi-input multi-output (MIMO) linear time-invariant (LTI) systems. The boundary layer approach is utilized in order to eliminate the chattering problem. Though the sliding variable remains in the vicinity of the sliding surface without reaching it, it is shown that the steady-state error vanishes exponentially asymptotically within a boundary layer, for systems of relative order one, even if parameter uncertainty and unmatched input disturbances exist. The pole placement is accomplished indirectly with an iterative optimization procedure by considering limits on controls and state. Finally, the output-feedback controller is augmented with a Luenberger full-state and disturbance observer.
      PubDate: Mon, 16 May 2016 00:00:00 GMT
       
  • Heading Estimation Based on Magnetic Markers for Intelligent Vehicles
    • Authors: Sub Byun Y; Chol Kim Y.
      Abstract: This paper presents a new real-time heading estimation method for an all-wheel steered single-articulated autonomous vehicle guided by a magnetic marker system. To achieve good guidance control for the vehicle, precise estimation of the position and heading angle during travel is necessary. The main concept of this study is to estimate the heading angle from the relative orientations of the magnetic markers and the vehicle motion. To achieve this, a kinematic model of the all-wheel steered vehicle is derived and combined with the motion of a magnetic ruler mounted near each axle underneath the vehicle. The position coordinates and polarities of the magnetic markers, which are provided a priori, are used to determine the vehicle position at every detection instance. A gyroscope is employed to assist real-time heading estimation at sample times when there are no marker detection data. The proposed method was tested on a real vehicle and evaluated by comparing the experimental results with those of the differential global positioning system (DGPS) in real-time kinematics (RTK) mode. Experimental results show that the proposed method exhibits good performance for heading estimation.
      PubDate: Fri, 13 May 2016 00:00:00 GMT
       
  • Physics-Based Lumped-Parameter Modeling of Automotive Canister Fuel Purge
    • Authors: Franchek M; Ebrahimi B, Grigoriadis K, et al.
      Abstract: A physics-based model is presented to estimate the flow rate out of the fuel canister purged into the intake manifold. The lumped parameters of the model, including canister capacitance and flow resistance, are employed to obtain a first-order multi-input and single-output dynamic model. The vacuum pressure in the intake manifold and the fuel tank pressure serve as inputs, and the purged fuel flow rate is considered as the model output. The model does not require cumbersome computation, thereby allowing direct implementation in the fueling control to compensate for the extra fuel in regulation of the stoichiometric air–fuel ratio.
      PubDate: Fri, 13 May 2016 00:00:00 GMT
       
  • Dynamics and Stability of Phase Controlled Oscillators
    • Authors: Brack T; Kern D, Chen M, et al.
      Abstract: This paper systematically analyzes linear oscillators, e.g., spring-mass-damper systems or RLC-circuits that are controlled by an extension of a phase-locked loop (PLL). These systems are often used in measurement applications where the stability and dynamics directly influence the measurement quality. Therefore, a description of the control loop in terms of phase signals is sought. However, the classical oscillator turns into a highly nonlinear system when it is formulated in amplitude/phase-variables of its input and output signals. Up to now, there were made either ab-initio assumptions of slowly varying parameters or trial-and-error designs. The novel approach proposed in this paper derives a universally valid description in state space form which enables the use of standard methods of nonlinear system theory. Using this description, the stability of phase controlled oscillators is analyzed by means of Lyapunov functions. A linearization is applied in order to effectively design the controller and optimize the closed-loop dynamics. Simulations with the original nonlinear systems are conducted to justify the linear approach. Thereby, two application scenarios are under consideration: Tracking of the desired target value (target phase shift) and resonance tracking (changes of the system parameters). It is found that including the phase dynamics of the oscillator significantly improves the description of the closed-loop behavior. Finally, the results are validated experimentally for an application measuring the viscosity of fluids.
      PubDate: Fri, 13 May 2016 00:00:00 GMT
       
  • Robust Control of Quadrotors Based on an Uncertainty and Disturbance
           Estimator
    • Authors: Sanz R; Garcia P, Zhong Q, et al.
      Abstract: In this paper, a robust control strategy is proposed to control the attitude and the altitude of quadrotors, based on an uncertainty and disturbance estimator (UDE). It is shown that the proposed controller can be tuned very easily, achieving the desired performance only by selecting an appropriate reference model and tuning a single parameter to tradeoff disturbance rejection with noise amplification in the control signal. The proposed control strategy is extensively validated in real-time applications with an experimental Quanser platform and also with a quadrotor prototype in real flight tests.
      PubDate: Fri, 13 May 2016 00:00:00 GMT
       
  • Design and Experimental Investigation of Rotational Angle-Based Tracking
           Control
    • Authors: Yang M; Song X, Sun Z.
      Abstract: This paper investigates tracking control in the rotational angle domain based on the time-varying internal model principle. The objective is to enable precise, reliable, and computationally efficient output tracking of signals that are dependent on angular displacement. To achieve desired performance, existing approaches based on internal model principle require a large number of samples per revolution, which significantly increases the controller order and also poses challenges for the transient performance. To address those issues, a varying sampling interval approach is proposed, where the angular sampling locations are not fixed but optimized based on tracking errors between sampling points so that desired performance can be achieved without increasing the number of samples. Meanwhile, to improve the convergence rate of the tracking error, additional linear matrix inequalities (LMI) constraints are added to the existing stabilizer synthesis. Through experimental study on a camless engine valve actuation system, the effectiveness of the proposed approaches is demonstrated. It is shown that, compared with the fixed interval sampling, the varying sampling approach can reduce the tracking error by over 50%.
      PubDate: Tue, 10 May 2016 00:00:00 GMT
       
  • Dynamic Adaptive Robust Backstepping Control Design for an Uncertain
           Linear System
    • Authors: Hajieghrary H; Ani Hsieh MM.
      Abstract: This paper builds on the existing adaptive robust control (ARC) synthesis method introduced by Yao et al. and presents a new method to synthesize ARCs. Based on dynamic backstepping, the approach explicitly addresses the uncertain dynamics which enters into the system via the higher-order channels of the state-space model. As such, the proposed dynamic ARC (D-ARC) method addresses the inherent weakness of the original approach where uncertainty in the higher-order channels is ignored. The proposed approach is illustrated in simulations for controlling a voice coil motor (VCM) actuator that serves as a read/write head for a single-stage hard disk drive (HDD). The effectiveness of the resulting D-ARC controller is validated by considering the transient performance, tracking errors, and disturbance rejection of the VCM operating in both the track-seeking and track-following modes.
      PubDate: Mon, 09 May 2016 00:00:00 GMT
       
  • A Dynamic Analysis on the Transition Curve of Profiled Chamber Metering
           Pump
    • Authors: Lei H; Hu H, Lu Y.
      Abstract: A profiled chamber metering pump (PCMP) is a new type of positive-displacement vane pump which is composed of a special stator and a rotor–slide assembly. The face-shaped curve of the inner chamber of the stator is formed by means of two quarter circular arcs and two quarter noncircular arcs, and one of the two quarter noncircular arcs is defined as transition curve. The geometry of the transition curve directly affects the dynamic performances of the pump system, including its mechanical vibration, friction, wear, and kinetic losses. This paper discusses a set of dynamic analysis methods that combine kinetic loss control with vibration control for optimization of the transition curve of the PCMP. At first, basic conception and work line on the method are explained. In a second step, by means of force analysis, a kinetic loss model is established. Then, the model is used to examine a group of vibration optimized curves in polynomial form, and kinetic losses caused by different mechanical resistance forces are calculated. Finally, through a comparison analysis together with vibration and kinetic losses, comprehensive optimal transition curves can be obtained.
      PubDate: Fri, 06 May 2016 00:00:00 GMT
       
  • A Combined Variable Displacement–Digital Cylinder Hydraulic Drive
           for Large Presses With High Operating Frequencies
    • Authors: Messner F; Scheidl R, Haas R, et al.
      Abstract: In this technical brief, a novel hydraulic drive for large forces and power ratings at relatively high operating frequencies combining variable displacement control and hydraulic digital control is introduced. Basic analog motion control is achieved via variable displacement pumps driving a first cylinder stage. Digital control is realized by switching additional hydraulic cylinder stages on and off to support the analog stage if high forces are needed. The control strategy corresponds to this hydraulic concept. It consists of a feed forward control, a switching logic for the digital booster stages and a feed back proportional-integral (PI) control for stabilization. The validity of this concept and of the control strategy are shown by experiments on a highly downscaled test rig.
      PubDate: Wed, 04 May 2016 00:00:00 GMT
       
  • Hydropower Plant Frequency Control Via Feedback Linearization and Sliding
           Mode Control
    • Authors: Ding X; Sinha A.
      Abstract: This paper presents a new nonlinear controller design approach for a hydraulic power plant focusing on load frequency control aspect. It is based on input state feedback linearization and sliding mode/H∞ control. Simulation results for a nonlinear dynamic model of entire hydropower plant are presented and compared to those from the classical linear proportional-integral (PI) controller. A novel two-stage scheme for the nonlinear controller design with integral feedback is presented for a fast transient response and zero steady-state error.
      PubDate: Tue, 03 May 2016 00:00:00 GMT
       
  • Robust Control of Uncertain Nonlinear Systems: A Nonlinear DOBC Approach
    • Authors: Chen W; Yang J, Zhao Z.
      Abstract: This paper advocates disturbance observer-based control (DOBC) for uncertain nonlinear systems. Within this framework, a nonlinear controller is designed based on the nominal model in the absence of disturbance and uncertainty where the main design specifications are to stabilize the system and achieve good tracking performance. Then, a nonlinear disturbance observer is designed to not only estimate external disturbance but also system uncertainty/unmodeled dynamics. With described uncertainty, rigorous stability analysis of the closed-loop system under the composite controller is established in this paper. Finally, the robust control problems of a missile roll stabilization and a mass spring system are addressed to illustrative the distinct features of the nonlinear DOBC approach.
      PubDate: Tue, 03 May 2016 00:00:00 GMT
       
  • Identification and Modeling of Contact Dynamics of Precise Direct Drive
           Stages
    • Authors: Feldman M; Zimmerman Y, Gissin M, et al.
      Abstract: The aim of this paper is to develop identification that is capable of capturing the characteristics of nonlinear tangential elastic and friction forces arising in submicron motions. Using novel Hilbert transform based signal processing and making use of the intimate relations between internal elastic and friction forces, the latter can be simultaneously recovered from measured data. The experiments were performed on a stage equipped with linear motors, while being driven by slow, quasi-harmonic excitation at frequencies of 1–40 Hz. The identified elastic force incorporates the inevitable nonlinear nature of the stage. The proposed identification technique can be useful for the analysis of modeling contact dynamics between moving and sliding parts in situ. This technique can possibly develop improved closed-loop control algorithms.
      PubDate: Tue, 03 May 2016 00:00:00 GMT
       
 
 
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