时域硬约束下汽车主动悬架-H2/H∞保性能控制

摘要

在充分考虑了悬架系统的时域硬约束的前提下,针对悬架系统的刚度和阻尼参数的摄动,运用线性矩阵不等式技术,提出了一种基于H2/H∞状态反馈控制的主动悬架鲁棒最优保性能控制策略.以半车模型为例,设计了主动悬架鲁棒H2/H∞最优保性能控制器.分别在悬架系统参数无摄动、向上摄动、向下摄动的三种情况下与相应的被动悬架做时域对比分析;并在频域做了悬架系统参数无摄动的功率谱密度的对比分析;仿真结果验证了所提出的主动悬架鲁棒H2/H∞保性能控制策略的可行性和有效性.%In this paper,under the premise of taking full account of the time domain hard constraints of the sus pension system,aiming at the perturbation of the stiffness and damping parameters of the suspension system and using the linear matrix inequality technique,a robust optimal guaranteed performance control strategy for active suspension system is proposed based on H2/H∞ state feedback control.Taking the half-car model as an example,the active sus pension H2/H∞ robust guaranteed cost controller was designed.Respectively,comparison analyses were conducted with corresponding passive suspension in time domain in three cases of suspension system parameters:without perturbation,upward perturbation,and downward perturbation.And in the frequency domain,the power spectral density of suspension system parameters without perturbation was analyzed comparatively.The simulation results verify the feasibility and the effectiveness of the proposed active suspension H2/H∞ optimal robust cost control strategy.