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Suppression of unnecessary vibration is an important aspect in control system design. Passive, semi active, and active suspension systems are used in vehicles to suppress vibrations and theoretically active suspension systems provide superior performance than the prior two types. This paper proposes a novel method to suppress vibrations using internal motor sensing method. The proposed active vibration...
A new control scheme combining the classical LQR control with modal decomposition method is presented for an active vehicle suspension system. Modal decomposition is proposed to optimize the weighted modal matrix, which gives each modal decomposition components with different weights according to their different importance. The LQR control scheme based on modal decomposition method is designed to...
The paper builds ten DOFs mechanical model and mathematical model of the vehicle and equipment, derives its frequency response by Fourier transform, Establishes the off-road spectrum as system input, resolve the models with MATLAB software to optimize the location and connection rigidity of the equipment. The study shows that shortening the distance of the equipment from vehicle body center and reduce...
Aimed at the effect of variable coefficients and the constant coefficients to the system, a quarter-car two degree freedom suspension vibration model is described, with the aid of matlab alternating senior programmable language, the algorithm is gained through function file, the simulation model of the road noise and the suspension system is obtained. Moreover, The one order standard sensitivity function...
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...
The viscoelastic damping is one of key factors that affect vehicle vibration. It has been demonstrated that fractional derivative model can accurately model this kind of frequency dependence damping very well. Generally, the excitation of rough road can be acted as a stationary random vibration process in time domain when a vehicle is traveling at constant speeds. But the road roughness should be...
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