Controller Order-reduction for Full-vehicle Active Suspension System Based on Frequency-weighting Method

Abstract

Abstract:

A dynamics model for a full-vehicle active suspension system with 7 degree-of-freedom was built. Considering the factors of high-frequency dynamic uncertainties and human’s sensitive frequency ranges to vibration, a weighted H∞ controller for the generalized suspension system was designed to restrain the road disturbances. Frequency-weighted coprime factorization based controller reduction method was utilized to reduce the order of the obtained high-order controller. Through ride comfort performance comparision and frequency-domain simulation analyses, the research results demonstrate that the order of high-order controller can be reduced significantly, and the reduced-order suspension closed-loop control system can obtain the similar control performance with the full-order one.

Key words: active suspension, H∞ control, frequency weighting, controller order-reduction

摘要：

建立了整车7自由度主动悬架系统动力学模型。考虑高频动态未建模不确定性和人体对振动的敏感频段等因素，为有效抑制路面干扰，设计了加权广义悬架系统H∞控制器。在此基础上，应用频率加权右互质分解控制器降阶方法对所设计的高阶控制器进行降阶。乘坐舒适性比较和频域仿真分析结果表明，高阶控制器的阶数被较大程度地降低，且降阶悬架闭环控制系统能获得与全阶悬架闭环系统相近似的控制性能。

关键词:

主动悬架, H&infin, 控制, 频率加权, 控制器降阶

CLC Number:

U461

HUANG Chang-Chi, HONG Hong-Bei.

Controller Order-reduction for Full-vehicle Active Suspension System Based on Frequency-weighting Method

[J]. China Mechanical Engineering, 2011, 22(11): 1366-1369.

黄长喜, 汪洪波.

基于频率加权的整车主动悬架系统控制器降阶研究

[J]. 中国机械工程, 2011, 22(11): 1366-1369.

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