Design and analysis of sub-optimal control strategy for heavy vehicle active suspension

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 141-147.

LI Jinhui1,2, ZHANG Keke2, XU Liyou1

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Abstract

In order to design a more reasonable sub-optimal control strategy of vehicle active suspension and study effects of different sub-optimal control strategies on heavy vehicle driving performance, a 4-DOF vehicle-pavement system dynamic model was established. A sub-optimal controller of vehicle active suspension was designed, and its performance indicators were weighted with the improved fuzzy hierarchy analysis method. Taking the linear weighted sum of vehicle body mass centroid acceleration and road damage coefficient as the index, different sub-optimal control strategies were evaluated and optimized. The driving performance differences of passive, optimal and sub-optimal control suspensions in time-frequency domain were contrastively analyzed. Results showed that influence difference of different sub-optimal control strategies on vehicle ride comfort and road friendliness is obvious; comprehensively considering the measurability of state variables and test cost, the sub-optimal control strategy to measure accelerations of vehicle body and axle and then perform an integral processing is optimal; the reasonably designed sub-optimal control suspension has the same performance as that of the optimal control one or is close to the latter, and it is superior to the passive suspension, so it has a better practicability.

Key words

vehicle active suspension / sub-optimal control / optimal control / ride comfort / road friendliness

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LI Jinhui1,2, ZHANG Keke2, XU Liyou1. Design and analysis of sub-optimal control strategy for heavy vehicle active suspension[J]. Journal of Vibration and Shock, 2020, 39(13): 141-147

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