Positive real optimization and performance analysis of new type vehicle electromechanical suspension

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (21) : 76-81.

QIU Chengqun1, SHEN Yujie2,3, SHI Dehua3

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Abstract

There are many mechanical elements in the vehicle suspension system which employing the three types elements, namely, the inerter, the spring and the damper, and it cannot be easily applied to the automotive engineering. Due to this problem, a parameter optimization design method of the vehicle mechatronic suspension is proposed in this paper based on the electromechanical similarity theory. On the basis of the dynamic model of a half car model with four freedom degrees of vehicle mechatronic suspension considering the vertical motion and the pitch motion during the driving process of the vehicle, this paper explores the improvements of the new vehicle mechatronic suspension employing mechatronic inerter on the dynamic performance of the vehicle. In terms of the multi parameters and multi constraints optimization problem, the improved particle swarm optimization algorithm is used to optimize the main parameters of three different modes of vehicle mechatronic suspension by considering the positive real of transfer function and the dynamic performance constraints of the suspension, and the mechatronic inerter and the external electric network are used to realize the network passively. Numerical simulations showed that, under the single objective optimized condition, the RMS of vehicle body acceleration and pitch angular acceleration of the new vehicle mechatronic suspension are reduced by 26.5% and 18.3% respectively, and they can decrease by 15.5% and 11.4% simultaneously when taken the two objectives into consideration. The dynamic vibration isolation performance of the proposed vehicle mechatronic suspension is significantly improved compared with the traditional passive suspension, which provides a new idea for the suspension design method.

Key words

vehicle / mechatronic suspension / half car model / inerter / network synthesis

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QIU Chengqun1, SHEN Yujie2,3, SHI Dehua3. Positive real optimization and performance analysis of new type vehicle electromechanical suspension[J]. Journal of Vibration and Shock, 2021, 40(21): 76-81

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