The Experts below are selected from a list of 146004 Experts worldwide ranked by ideXlab platform

Devdutt Singh - One of the best experts on this subject based on the ideXlab platform.

Yahaya Md Sam - One of the best experts on this subject based on the ideXlab platform.

  • Modeling and control active suspension system for a full Car Model
    2009 5th International Colloquium on Signal Processing & Its Applications, 2009
    Co-Authors: Rosheila Darus, Yahaya Md Sam
    Abstract:

    The purpose of this paper is to investigate the performance of a full Car Model active suspension system using LQR controller. Dynamic Model used in this study is a linear Model. A linear Model can capture basic performances of vehicle suspension such as body displacement, body acceleration, wheel displacement, wheel deflection, suspension travels, pitch and yawn. Performance of suspension system is determined by the ride comfort and vehicle handling. It can be measured by Car body displacement and wheel displacement performance. Two types of road profiles are used as input for the system. Simulation is based on the mathematical Model by using MATLAB/SIMULINK software. Results show that the performance of body displacement and wheel displacement can be improved by using Linear Quadratic Regulator control (LQR).

  • proportional integral sliding mode control for the half Car active suspension system with hydraulic actuator
    ROCOM'08 Proceedings of the 8th WSEAS International Conference on Robotics Control and Manufacturing Technology, 2008
    Co-Authors: Yahaya Md Sam, Norhaida Mohd Suaib, J H S Osman
    Abstract:

    The purposes of this paper are to present a new mathematical Model and control technique for Modeling and control of an active suspension system with hydraulic dynamics for a half Car Model. In this paper the new mathematical Model is presented which will give a much more complete mathematical representation of hydraulically actuated suspension system for the half Car Model. The Models presented taking into account all the pressure difference parameters inherent in the hydraulic cylinder. However, from the derived mathematical expression for the systems, it is found that the system suffer from mismatched condition problem due to the nature of the road disturbance which is not in phase with the control input. Thus, a new control technique is proposed that will be able to overcome the mismatched condition problem inherent in the system. In order to achieve the desired ride comfort and road handling and to solve the mismatched condition, a proportional-integral sliding mode control (PISMC) technique is presented to deal with the system and uncertainties. Extensive simulations are performed for different road profiles and the results showed that the proposed controller performed well in improving the ride comfort and road handling for the half Car Model using the hydraulically actuated suspension system. The results also showed that the system is completely insensitive to the external disturbance due to the road surface irregularities. Thus, it is also proved that the proposed controller is capable to overcome the mismatched condition problem that present in the active suspension system.

  • proportional integral sliding mode control of a hydraulically actuated active suspension system force tracking and disturbance rejection control on non linear quarter Car Model
    International Journal of Vehicle Systems Modelling and Testing, 2007
    Co-Authors: Yahaya Md Sam, Khisbullah Hudha, J H S Osman
    Abstract:

    This paper deals with a robust strategy for controlling a hydraulically actuated active suspension system for a quarter Car Model. The system consists of an inner loop for force tracking control of the hydraulic actuator and an outer loop controller to reject the effects of road induced disturbances. The Proportional Integral Sliding Mode Control (PISMC) scheme is proposed for the outer loop and the Proportional Integral (PI) control is utilised for the inner loop. The performance of the proposed controller is compared to the LQR controller and the passive suspension system through computer simulations.

J H S Osman - One of the best experts on this subject based on the ideXlab platform.

  • proportional integral sliding mode control for the half Car active suspension system with hydraulic actuator
    ROCOM'08 Proceedings of the 8th WSEAS International Conference on Robotics Control and Manufacturing Technology, 2008
    Co-Authors: Yahaya Md Sam, Norhaida Mohd Suaib, J H S Osman
    Abstract:

    The purposes of this paper are to present a new mathematical Model and control technique for Modeling and control of an active suspension system with hydraulic dynamics for a half Car Model. In this paper the new mathematical Model is presented which will give a much more complete mathematical representation of hydraulically actuated suspension system for the half Car Model. The Models presented taking into account all the pressure difference parameters inherent in the hydraulic cylinder. However, from the derived mathematical expression for the systems, it is found that the system suffer from mismatched condition problem due to the nature of the road disturbance which is not in phase with the control input. Thus, a new control technique is proposed that will be able to overcome the mismatched condition problem inherent in the system. In order to achieve the desired ride comfort and road handling and to solve the mismatched condition, a proportional-integral sliding mode control (PISMC) technique is presented to deal with the system and uncertainties. Extensive simulations are performed for different road profiles and the results showed that the proposed controller performed well in improving the ride comfort and road handling for the half Car Model using the hydraulically actuated suspension system. The results also showed that the system is completely insensitive to the external disturbance due to the road surface irregularities. Thus, it is also proved that the proposed controller is capable to overcome the mismatched condition problem that present in the active suspension system.

  • proportional integral sliding mode control of a hydraulically actuated active suspension system force tracking and disturbance rejection control on non linear quarter Car Model
    International Journal of Vehicle Systems Modelling and Testing, 2007
    Co-Authors: Yahaya Md Sam, Khisbullah Hudha, J H S Osman
    Abstract:

    This paper deals with a robust strategy for controlling a hydraulically actuated active suspension system for a quarter Car Model. The system consists of an inner loop for force tracking control of the hydraulic actuator and an outer loop controller to reject the effects of road induced disturbances. The Proportional Integral Sliding Mode Control (PISMC) scheme is proposed for the outer loop and the Proportional Integral (PI) control is utilised for the inner loop. The performance of the proposed controller is compared to the LQR controller and the passive suspension system through computer simulations.

Jerzy Kasprzyk - One of the best experts on this subject based on the ideXlab platform.

  • vibration control in quarter Car Model with magnetorheological dampers using fxlms algorithm with preview
    European Control Conference, 2014
    Co-Authors: Piotr Krauze, Jerzy Kasprzyk
    Abstract:

    The paper presents a novel approach to the adaptive control of a semi-active vehicle suspension with magnetorheological (MR) dampers. Research was Carried out for a quarter-Car Model with two degrees of freedom and the Bouc-Wen Model of the MR damper behavior. To apply vibration control the inverse Model of the damper is needed to determine the current controlling the MR damper. Thus, the Bouc-Wen Model was approximated by the Model based on tanh function with hysteresis included, which can be easy inverted. This approach resembles the real situation, where the Model used for control does not correspond perfectly to the real device. The dissipative domain of this Model can be modified by subtracting a nonlinear average velocity-force characteristics from the original one. After such modification, the real semi-active element can be treated as a fictitious active actuator which generates force limited by the nonlinear boundaries dependent on the relative piston velocity. Hereby, the FxLMS adaptive algorithm can be applied for vibration control in the semi-active suspension assuming preview about the road excitation is available as the reference signal. Simulation experiments indicated the high performance of the proposed approach and its advantage over the classical Skyhook algorithm in vibration control of the suspension. Adaptability of vibration control based on the FxLMS makes the presented algorithm scalable.

  • neural network based lq control of a semiactive quarter Car Model
    International Conference on Methods and Models in Automation and Robotics, 2013
    Co-Authors: Piotr Krauze, Jerzy Kasprzyk
    Abstract:

    The paper presents an application of LQ control dedicated to a semiactive quarter-Car Model (2 degrees of freedom) which includes nonlinear Model of a magnetorheological (MR) damper. Optimal control gains are derived based on known quarter Car Model parameters and limitations imposed on absolute vertical velocities of sprung and unsprung masses as well as on desired force generated by MR damper. Solutions of the algebraic Riccati equation obtained for LQ continous time infinite horizon problem using system output and control weights matrices are approximated using neural network. The static feedforward neural network Model was identified using Levenberg-Marquardt backpropagation method in order to map nonlinear relations between system variables limitations and control gains. The algorithm was adapted to the semiactive system using a linearized inverse MR damper Model. Simulation based analysis of vibration mitigation was Carried out in frequency domain for different experiments conditions; the analysis justifies application of neural networks in LQ based control of semiactive suspension.

Urszula Ferdek - One of the best experts on this subject based on the ideXlab platform.

  • non linear analysis of a quarter Car Model with stroke dependent twin tube shock absorber
    Mechanical Systems and Signal Processing, 2019
    Co-Authors: Jan łuczko, Urszula Ferdek
    Abstract:

    Abstract The work presents results of the analysis of a quarter-Car Model with a modified twin-tube hydraulic shock absorber. In comparison with a classical damper, this shock absorber possesses an additional double-chamber cylinder. The flow of oil into these chambers is controlled by relative displacement of the auxiliary piston and by pressure difference in the adjacent chambers. The introduced nonlinear spring element – bumper – protects the shock absorber against damage in the case of large amplitudes of excitations. Performance efficiency of the shock absorber Model within the range of both large amplitudes and high excitation frequencies ensures that the change of the oil bulk modulus resulting from a change in pressure is accounted for. The introduction of additional chambers into the shock absorber leads to a change in the characteristics of the damping force. Within the range of small amplitudes and high frequencies the system acts like a shock absorber with a soft characteristic, which improves the driving comfort. In resonance ranges the increase in the damping force ensures higher driving safety. The analysis of the system response to the harmonic excitation of variable frequency and amplitude as well as to the random excitation permits to examine the impact of excitation parameters and construction parameters on the indicators characterizing the driving comfort and safety. The results of numerical simulations are illustrated with the graphs of time histories, spectral analyses, characteristics of the damping force, and others, illustrating the processes of controlling oil flow.

  • performance comparison of active and semi active smc and lqr regulators in a quarter Car Model
    Journal of Theoretical and Applied Mechanics, 2015
    Co-Authors: Urszula Ferdek, Jan łuczko
    Abstract:

    In this paper, an analysis is performed on a quarter-Car Model of Car suspension with semi-active and active damper utilizing the sliding mode (SMC) and linear-quadratic control (LQR). The effect of control parameters and time delays in the transmission of control signal on the factors related to the safety and comfort of driving is investigated. The results obtained from numerical simulations are shown in form of frequency characteristics for several selected performance factors.