电流变阻尼悬架的半主动控制分析

Analysis of semi-active control of electro-rheological suspension

在介绍电流变液基本特性的基础上,提出了基于电流变阻尼悬架的半主动控制,并建立了1/4车辆动力学模型,给出了悬架系统的状态空间方程。依据随机线性最优控制理论,以车身加速度、悬架动行程和轮胎动位移的加权二次型最小为控制性能指标,设计了LQG控制器;依据模糊控制理论,设计了二输入单输出的模糊控制器,根据经验和理论分析制定了模糊控制规则。运用Matlab/Simulink进行了悬架半主动控制的建模和仿真分析。仿真结果显示,与被动控制相比,半主动控制有很好的控制效果,车身加速度下降超过40%,显著地改善了车辆的平顺性。

On basis of introducing the essential characteristics of electro-rhcological（ER） fluid, semi-active control for suspen- sion based on ER damper was presented, and a quarter car dynamic model was established. Its state space equation was derived. According to linear quadratic gaussian stochastic optimal control theory, weighted quadratic performance index related to the body acceleration, the suspension working space and the tyre dynamic displacement was used to design the LQG controller; according to fuzzy control theory as well, a fuzzy logic controller with two inputs and one output was designed. The fuzzy rules were estab- lished by experiences and theory analysis. Then Matlab/Simulink was used to set up the model including passive and semi-active control and simulate. The results show that the semi-active control is more effective than the passive control, the body acceleration has declined by 40% and ride quality has improved observably.