基于AHP的车辆主动悬架LQG控制器设计

摘要

基于层次分析法(AHP)设计了一种能够降低车身加速度(BA)、悬架动行程(SWS)和轮胎动位移(DTD)的车辆主动悬架线性最优(LQG)控制器.首先建立了2自由度1/4车辆主被动悬架动力学模型；然后采用AHP确定了悬架各性能评价指标的加权系数并利用最优控制理论设计了车辆主动悬架控制器；最后在Matlab/Simulink环境下进行了仿真分析.对仿真结果进行对比后表明:在特定工况下通过对加权系数的合理选取,BA、SWS和DTD比被动悬架分别减小了18.73％、22.22％和4.76％,且主动控制力的均方根值为535.3994 N.%Based on analytic hierarchy process ( AHP) , a linear quadratic and Gaussian distributed ( LQG) controller for active suspension was designed, it could depress body acceleration ( BA) , suspension working space ( SWS) and dynamic tyre displacement(DTD). A 2-DOF dynamic model of a 1/4 vehicle passive and active suspension was firstly established. Then, weighted coefficients of all performance evaluation indicators were determined by adopting AHP and a LQG controller for a vehicle active suspension system was designed by using the optimal control theory. Finally, the model was simulated and analyzed under Matlab/Simulink environment. The comparision of simulation results illustrated that with proper selection of weighted coefficients, the BA, SWS and DTD of the active suspension are 18. 73% 、22. 22% and 4. 76% lower than those of the passive one, the RMS of active control force is 535. 3994 N.