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Vehicle suspension systems are important for significantly improving passenger comfort and handling characteristics. A well-designed suspension system can improve the entire performance of the automobile chassis. In this paper, an adaptive vibration control strategy is proposed for nonlinear uncertain suspension systems to stabilize both the vertical and pitch motions of the car and, thus, to contribute...
Safety analysis and the forced vibration characteristic investigation of a single DOF vehicle suspension system with hysteretic nonlinearity characteristic under road quasi-period multi-frequency excitation is carried out in this paper. Probability of system occurred chaos and disturb state character of closed-trajectories near center is studied though the Melnikov' function and KAM theory. The complexity...
LQG and LQI control theory were used to control the suspension system of the vehicle. We analyzed the characters of the system through simulation, and found that, with the LQI control algorithm, ride comfort and dynamic deflection can be improved simultaneously at the natural frequency of the weight on the spring. While with the LQG control algorithm cannot bring about that. But with LQG control,...
For the tracking control problem of vehicle suspension system, a method of adaptive sliding mode control is derive in this paper. The influence of parameter uncertainties and external disturbances on the system performance can be reduced and control robustness can be improved. The adaptive sliding mode controller is designed so that the practical system can track the state of the reference model....
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...
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 exact stationary response of the suspension vehicle system under the random road excitation is deduced based on the stochastic averaging method. Then, the control law is assumed to be velocity feedback control and the unknown control gains are determined by minimizing the modal performance indices. A quarter-car model is taken as example to illustrate the proposal method and the numerical results...
In order to ensure the performance of vehicle suspension always in good condition, the suspension performance should be detected regularly, to identify the fault symptom and fault reason. In view of the complex correlation of the suspension symptom and fault reason, this paper puts forward the diagnosis method based on fuzzy mathematics, introduces fuzzy mathematical method into the suspension fault...
To approach an effective vibration control, the emphasis of the research is an adaptive control method for vehicle suspension system. Because of the features of the passive suspension's structure, the system can only store or exhaust the body vibration energy. So the conception of active and semiactive suspension has been advanced, which give a new way to improve the vibration performance of suspension...
For the riding comfort and handling safety of vehicle, an active suspension system with adjustable fuzzy controller is advanced. According to the evaluation method of vehicle vibration performance, the acceleration of the sprung mass, dynamic tire load between wheels and road and dynamic deflection between the sprung mass and the unsprung mass are determined as the evaluation targets of suspension...
This paper presents the feasibility study of an electromagnetic damper, as sensor/actuator, for vehicle suspension application. This electromagnetic damper is based on the concept of the tubular, linear, brushless DC motor, and operates in three modes: passive, semi-active, and active. As a self-powered active shock absorber, the proposed damper has the potential to function as a sensor and actuator...
A parallel genetic algorithm based coarse-grained module for the optimal design of the flexible multi-body model vehicle suspensions is presented and the skeleton implementing is constituted in this paper. This paper tests the algorithm on the cluster system. The results show that the application of the algorithm presented in this paper outperforms equivalent sequential genetic algorithms for the...
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...
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