车辆主动悬架自适应LQG控制策略研究  

Study on the Control Strategy of Adaptive LQG for Active Suspension Vehicle

作　　者：闫光辉[1] 关志伟[1] 杜峰[1] 刘臣富[1] 

机构地区：[1]天津职业技术师范大学汽车与交通学院,天津300222

出　　处：《机械科学与技术》2014年第3期432-437,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：天津市自然科学基金项目(12JCZDJC34500)资助

摘　　要：针对车辆主动悬架的结构原理,建立了其动力学模型。在分析车辆主动悬架状态方程具有时变性的基础上,提出了自适应LQG主动悬架控制策略,通过自适应控制模型能够实现对车辆悬架时变参数和扰动输入参数的辨识。结合LQG控制性能指标函数,在确立簧载质量垂直加速度、悬架动行程和轮胎动行程的加权系数后,通过采用扩展自回归滑动平均模型进行悬架时变参数辨识,实现了主动悬架的自适应LQG控制。仿真结果表明自适应LQG控制策略优于LQG控制,较好地改善了车辆的平顺性。Aiming at the construction principle of vehicle active suspension, this paper established its dynamic model. Considering the time-varying characters of vehicle active suspension state equation, the adaptive LQG active suspension control strategy is proposed, with this daptive control model of vehicle suspension the time-varying pa- rameters and disturbance input parameters can be identified. Combined with LQG control performance index func- tion, the vertical acceleration of sprung mass, weighting coefficients of suspension dynamic flexibility and mi- crostroke of tire are established. The time-varying parameter of suspension is identified by using the extended auto- regressive moving average （ARMAX） model, and finally the active suspension adaptive LQG control is achieved. The simulation results show that the adaptive LQG control strategy is better than the LQG control strategy and has improved the ride comfort of vehicle.

关 键 词：主动悬架 状态方程 线性二次最优 自适应控制 参数辨识 仿真 

分 类 号：U463.33[机械工程—车辆工程]