LQG control of active suspension based on adaptive road surface level

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 30-37.

KOU Farong, GAO Yawei, JING Qiangqiang, PENG Xianlong, WANG Xing

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Abstract

In order to solve the problem of poor ride comfort and handling stability of vehicles on mixed level road surfaces, a LQG control strategy of active suspension based on adaptive road surface level was proposed.The road surface level was identified according to the relationship between pavement power spectral density and international roughness index.Three kinds of control objectives were determined with different road surface levels taken as thresholds, and the variance of judgment value of average taste concentration after each iteration was calculated to determine next iteration step length to solve problems of premature convergence and long iteration times of Drosophila algorithm.The corresponding fitness functions were set up under different control objectives, and the improved Drosophila algorithm was used to optimize the weighting coefficient of LQG control under different fitness functions to improve the control performance under mixed level road surface.The dynamic performance of the suspension under different levels of road surface was simulated and analyzed, and real vehicle tests were conducted on road.The simulation results showed that compared with the traditional LQG control, the proposed suspension system based on pavement level adaptive LQG control can reduce the RMS value of the spring loaded mass acceleration by 16.34% under A-level road surface, and the RMS value of the tire dynamic load by 6.51% under D-road surface; RMS values of spring loaded mass acceleration and tire dynamic load can be reduced by 9.59% and 7.54% under B-road surface, and 11.32% and 9.4% under C-road surface, respectively; test results are basically consistent to simulation ones.

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active suspension / road surface level / Drosophila algorithm / LQG control

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KOU Farong, GAO Yawei, JING Qiangqiang, PENG Xianlong, WANG Xing. LQG control of active suspension based on adaptive road surface level[J]. Journal of Vibration and Shock, 2020, 39(23): 30-37

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