基于T-S模糊模型的半主动悬架非线性控制方法

Nonlinear control method of semi-active suspension frame based on T-S fuzzy model

建立1/2车四自由度半主动悬架的T-S模糊模型,将其描述成多个局部线性系统的组合.运用并行分布补偿方法设计各个子系统的状态反馈控制器,通过求解线性矩阵不等式族等方法获得控制器参数,验证T-S模糊模型的有效性和闭环系统的稳定性.仿真结果表明,采用本文控制方法设计的半主动悬架与被动悬架相比,系统振动能快速衰减,趋于稳定速度更快.

T-S fuzzy model of four Degree-of-freedom semi-active suspension frame of half-vehicle was es- tablished and described as a combination of several local linear systems. The state feedback controller was designed for each local linear subsystem with parallel-distributed compensation（PDC）, the parameters of controller was obtained by means of solving linear matrix inequalities（LMIs）, and the validity of T-S fuzzy model and the stability of closed-loop system were verified. The simulation result showed that, comparing the semi-active suspension frame designed with the control method presented in this paper to passive sus- pension frames, the attenuation of system vibration became faster in the former and the stability could be quickly realized. The proposed control method was effective for deal with complicated nonlinear system.