Abstract
A time-delayed acceleration feedback control is proposed to improve the vibration performance of a nonlinear vehicle suspension system. First, the harmonic balance method is applied to obtain the vertical acceleration amplitude of the system excited by simple harmonic road excitation. Then, taking the amplitude of the sprung mass acceleration and control force into account, the single-objective and multiple-objective optimization problems of time-delayed feedback control parameters, respectively, are discussed. Finally, the mathematical simulation is provided to verify the correctness of the optimization results. It is concluded that the nonlinear suspension with optimal time-delayed feedback control has better vibration control performance compared to passive one. The acceleration amplitude of the sprung mass is significantly reduced by the single-objective optimization of the control parameters. Moreover, when the optimal time delay is introduced, the active control force input is fewer than that without time delay. The phenomenon of energy transfer between the sprung mass and the unsprung mass is observed in some road-excitation frequencies.
Highlights
The suspension system is a key component which affects the ride comfort, handling stability, and safety of the vehicle
The conclusions are summarized as follows: 1. The vibration control effect of the nonlinear vehicle suspension is greatly improved by the single-objective optimization of control parameters
Compared to that under passive control, the acceleration amplitude of the sprung mass is reduced by 50% for X 1⁄4 1 Hz
Summary
The suspension system is a key component which affects the ride comfort, handling stability, and safety of the vehicle. Owing to the advantages of simple structure, easy realization, and low cost, the passive suspension is commonly used in vehicles. The passive suspension loses efficacy in the case of the complex road conditions. According to the driving conditions, the real-time adjustment of control parameters in active and semi-active suspensions may be realized to achieve satisfactory performance. A great deal of effort has been devoted to the studies of active and semi-active suspensions in recent years.[1,2,3,4,5,6] Various control strategies are presented to improve the performance of the suspension such as sliding mode control, fuzzy control, H1 control and so on
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