Abstract
In this paper, the mechanical model of two-degree-of-freedom vehicle semi-active suspension system based on time-delayed feedback control with vertical acceleration of the vehicle body was studied. With frequency-domain analysis method, the optimization of time-delayed feedback control parameters of vehicle suspension system in effective frequency band was studied, and a set of optimization method of time-delayed feedback control parameters based on “equivalent harmonic excitation” was proposed. The time-domain simulation results of vehicle suspension system show that compared with the passive control, the time-delayed feedback control based on the vertical acceleration of the vehicle body under the optimal time-delayed feedback control effectively broadens the vibration absorption bandwidth of the vehicle suspension system. The ride comfort and stability of the vehicle under random road excitation are significantly improved, 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.
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
Kou and Fan et al.[6] designed a kind of the semi-active suspension with electro-hydrostatic actuator (EHA) to improve the ride comfort and stability of the vehicle, which the results show that the EHA semi-active suspension has good damping controllability
The mechanical model of vehicle semi-active suspension system based on time-delayed feedback control with vertical acceleration of the vehicle body is studied
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.[15] constructed a two-degree-of-freedom vehicle suspension model based on time-delayed feedback control with vertical acceleration of vehicle body, and the PSO 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. In order to simplify the research problem, the vehicle vibration caused by road roughness is mainly studied in this paper without considering the influence of the unbalanced force caused by the engine and transmission system, as well as other factors of the vehicle itself on the body vibration, taking magneto-rheological damper as active control actuator, the timedelayed feedback control of body vertical acceleration is introduced on the basis of vehicle passive suspension. When the u(t-τ) disappears, the semi-active suspension system based on time-delayed vibration reduction control will degenerate into a passive suspension vibration reduction system
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