H2/H∞ guaranteed cost control for active suspensions considering parameter uncertainty

被引：0

作者：

Pang H. ^{[1
]}

Wang Y. ^{[1
]}

Liu F. ^{[1
]}

机构：

[1] School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an

来源：

Kongzhi yu Juece/Control and Decision | 2019年 / 34卷 / 03期

关键词：

Active suspension; Conservatism; H[!sub]2[!/sub]/H[!sub]∞[!/sub] guaranteed cost control; Linear fractional transformation; Lyapunov stability; Parameter uncertainty;

D O I：

10.13195/j.kzyjc.2017.1193

中图分类号：

学科分类号：

摘要：

Aiming at the control and stability problem of vehicle active suspension systems with parameter uncertainty, a mixed H2/H∞ guaranteed cost state feedback control strategy based on linear fractional transformation (LFT) is proposed. Firstly, to improve vehicle ride comfort and ensure the security of vehicle driving, the quarter dynamics model of vehicle active suspension is established when considering the uncertainties of the active suspension system. The H2 norm of vehicle body acceleration is selected as the output performance index of the controller to be minimized, and the constraints of suspension dynamic deflection and tire dynamic load are determined as the H∞ constraint performance output indicators of the designed controller. Then, based on the Lyapunov stability theory, an optimal mixed H2/H∞ guaranteed cost state feedback control approach is presented to reduce the conservatism of controller design. Finally, a numerical example of quarter-vehicle active suspensions is provided, and the simulation results demonstrate that the proposed control strategy has better disturbance attenuation capability against the external road disturbance, and can obviously improve the overall performance of vehicle suspension. © 2019, Editorial Office of Control and Decision. All right reserved.

引用

页码：470 / 478

页数：8

共 30 条

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