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research-article

Non-fragile H8 control of delayed active suspension systems in finite frequency under non-stationary running

[+] Author and Article Information
Wenfeng Li

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510000, China
201720101033@mail.scut.edu.cn

Zhengchao Xie

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510000, China
zxie@scut.edu.cn

Pak Kin Wong

Department of Electromechanical Engineering, University of Macau, Taipa, Macau
fstpkw@um.edu.mo

Xinbo Ma

Department of Electromechanical Engineering, University of Macau, Taipa, Macau
yb57467@um.edu.mo

Yucong Cao

Automotive Engineering Institute, Guangzhou Automobile Group Co., LTD, Guangzhou 510000, China
caoyucong@gaei.cn

Jing Zhao

Department of Electromechanical Engineering, University of Macau, Taipa, Macau
jzhao@um.edu.mo

1Corresponding author.

ASME doi:10.1115/1.4042468 History: Received July 01, 2018; Revised December 28, 2018

Abstract

The vehicle active suspension has drawn considerable attention due to its superiority in improving the vehicle dynamic performance. This paper investigates the non-fragile H8 control of delayed vehicle active suspension in finite frequency range under non-stationary running. The control objective is to improve ride quality in finite frequency band and ensure suspension constraints, and a quarter car model of active suspension is established for controller design. Then, the input delay, actuator uncertainty and external disturbances are considered in the controller design. Moreover, a further generalization of the strict S-procedure is utilized to derive a sufficient condition in terms of linear matrix inequality (LMI) to capture performance in the concerned frequency range. Furthermore, a multi-objective controller is designed based on projection lemma in the framework of the solution of LMIs. A non-stationary road profile is established and numerical simulations are also conducted to show the effectiveness and robustness of the proposed controller. Finally, experimental tests on a quarter-car test rig are implemented to examine the performance of the proposed controller for real applications.

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