基于NSGA_2与LMI的主动悬架混合H_2/H_∞鲁棒控制

Investigation on Active Suspension Mixed H_2/H_∞ Robust Control Based on NSGA_2 and LMI

考虑实际应用,提出一种考虑电液作动器动态特性的主动悬架模糊静态输出反馈控制器的设计方法。利用T-S模糊模型逼近具有非线性动态特性的主动悬架模型,将悬架设计考虑的三个指标中的行驶平顺性(车身垂直加速度)作为H2性能指标,操纵稳定性(轮胎动载荷)和悬架动行程作为H∞性能指标,利用多目标遗传算法——NSGA_2对控制增益进行搜索,通过解线性矩阵不等式得到H2和H∞范数。用MATLAB/Simulink仿真进行比较,结果表明,所得主动悬架的三个性能指标都优于被动悬架。

For practical application,this paper presented a fuzzy static output feedback controller design approach for vehicle electro-hydraulic active suspensions.Takagi-Sugeno（T-S） fuzzy modeling was applied for approximating the dynamic nonlinear active suspension model.Three main performance requirements should be considered in designing suspension,ride comfort,handing stability and suspension deflection,this paper took the vertical acceleration of the car body as H2 performance,and suspension deflection and tyre deflection as the H∞ performance.NSGA_2 was atilized for searching the feedback gain matrix,the H2 and H∞ norm were acquired via solving LMI.The comparison of the simulation results between active suspension and passive suspension in MATLAB/simulink shows that the three main performances of active suspension are better.