Abstract
This paper proposes parameter controlling optimization of the time-delay feedback that is based on "equivalent harmonic excitation" in effective frequency band towards optimization of delay feedback control parameters for vehicle semi active suspension system. In this way, the optimal values of delay feedback control parameters based on different types of delay feedback control (displacement, velocity and acceleration) of wheels in the effective frequency band are obtained. Finally, through the stability analysis of vehicle semi-active suspension system based on different types of wheel delay feedback control and the numerical simulation analysis of time-domain response of suspension system performance evaluation index, the superiority of the time-delay feedback control strategy based on wheel displacement and the effectiveness and feasibility of the equivalent harmonic excitation optimization strategy are verified. Therefore, it provides a theoretical reference for the selection of time-delay feedback control strategy and the optimal design of time-delay feedback control parameters of vehicle active and semi-active suspension system.
Highlights
Vehicle suspension system behaves as one of the most important parts of modern automobile, and its vibration isolation performance has an important influence on the ride comfort and driving safety of vehicle
The time-domain simulation results show that: compared with the passive suspension system, the vehicle active suspension system based on the time-delayed feedback control with vertical displacement of wheel can significantly improve the ride comfort and stability of the vehicle under the optimal time-delayed feedback control, which provides a theoretical basis for the selection of time-delayed feedback control strategy and the optimal design of time-delayed feedback control parameters of vehicle suspension system
The mechanical model of four-degreeof-freedom vehicle active suspension system based on timedelayed feedback control with vertical displacement of wheel is studied, the optimal value of the time-delayed feedback control parameters of vehicle suspension system in effective band is obtained by using the optimization strategy based on "equivalent harmonic excitation" and particle swarm optimization algorithm
Summary
Vehicle suspension system behaves as one of the most important parts of modern automobile, and its vibration isolation performance has an important influence on the ride comfort and driving safety of vehicle. Liu and Sun et al [12] constructed a twodegree-of-freedom vehicle suspension model based on timedelayed feedback control with vertical acceleration of vehicle body, and the particle swarm optimization algorithm is adopted to study the optimization of time-delayed feedback control parameters of vehicle suspension system under different road harmonic excitation frequencies in finite frequency band. The research on time-delayed vibration reduction control strategy and control effect of vehicle active suspension system is mostly based on the 2-DOF vehicle suspension system with single time-delayed feedback control such as vertical acceleration of vehicle body. In order to further improve the vibration reduction effect of vehicle active suspension system based on timedelayed feedback control under road random excitation, in this paper, the mechanical model of 4-DOF vehicle active suspension system based on double time-delayed feedback control is studied.
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