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This paper deals with a new approach to analyse the influence of suspension on dynamic behaviour of vehicle and to synthesise the force-displacement transmittance of suspension. From a half-car model with four degrees of freedom, it is shown how the design of suspension, which is a vibration isolation problem, can be transformed into a synthesis of a robust control law of a multivariable uncertain...
The application of the Linear Quadratic Regulator (LQR) and Fuzzy Logic Controller (FLC) in the field of active vibration isolation for a vehicle suspension system is presented and the performances of the two active controllers are compared with the passive system. The performance of the LQR controller is better than the FLC at the expense of control force. The performances of both active controllers...
Based on electrical-mechanical analogies, a principle of vibration isolation was presented, and a new vehicle suspension employing inerter, which can ease conflicts among individual performance measures for conventional suspension and improve on passenger comfort, was designed. After a quarter-car model was established, parameters of the suspension were optimized, and performance benefits in the suspension...
This paper presents an intelligent method of Active Force Control scheme applied to the vehicle suspension system of a quarter car model with actuator dynamics. The proposed controller structure consists of three loops. Outer loop controller is used for the target force computation to reject the road disturbances. Inner force tracking loop is used to keep the actual force close to the target force...
The simulation model of railway vehicle semi-active vibration isolation system is constructed by application of Matlab / Simulink software, and the dynamics simulation on railway vehicle semi-active vibration isolation system is carried out. In the case of random input, the vibration isolation characteristics (such as distance of vibration isolation, vibration acceleration response variance) of railway...
In this paper we present one of the concepts of vehicle seat vibration isolation, using five fuzzy controllers together with neural network, combining it into a hybrid system. We used fuzzy controllers as a part of a semi-active vehicle suspension system, which consists of semi-active air spring and passive damper. System is implemented between the cabin floor and vehicle seat. Fuzzy controllers are...
In this paper we present one of the concepts of vehicle seat vibration damping, using a fuzzy controller. We used a fuzzy controller as a part of a semi-active vehicle suspension system, which consists of semi-active air spring and semi-active damper. System is implemented between the cabin floor and vehicle seat. Fuzzy controller is designed to adjust the stiffness of the air spring and damping of...
In this paper, a control strategy of active suspension based on the fuzzy logic control has been investigated. Using incorporating feedback from force sensor at front and rear active suspension system, the control system shows the improvement of the dynamic responses of the vehicle. A multi degree-of-freedom nonlinear model is co-simulated by MATLAB/Simulink and ADAMS/car. The simulation results indicate...
The vehicle vibration affects its ride comfort and handling stability. Because the passive suspension has its limitations, many new-type suspensions have emerged as the times require. Active suspension is one of them. The vehicle active suspension based on giant magnetostrictive actuator (GMA) can finish active control of vibration relying on its energy system by actuator, so a good active vibration...
This paper demonstrates an active suspension system for vehicles using fuzzy logic controls. The model is described by a linear system with five degrees of freedom. Road roughness height is modeled as a filtered white noise stochastic process. Based on control theory, the fuzzy control system of the active suspension is proposed. By using the Matlab/simulink software, the simulation model is obtained...
The paper is concerned with an active suspension system for vehicles using a LQG control. The model created here is described by a linear system with four degrees of freedom, subject to random excitation from road surface. The control is determined from the view-point of ride comfort, minimizing a given perform index. The simulation results indicate that the proposed active suspension system performs...
Adaptive control has drawn attention for active vibration isolation and vehicle suspensions because of its potential to perform in the presence of nonlinearities and unknown or time-varying parameters. Model-reference adaptive control has been used to force the plant to track the states or certain outputs of the ideal reference model. In this paper, we study the application of a new adaptive approach,...
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