基于改进层次分析法的半主动悬架LQG控制器的设计  

Design of LQG Controller for Semi-active Suspension Based on Improved Analytic Hierarchy Process

作　　者：张志飞[1,2] 刘建利[2] 徐中明[1,2] 李仕生[2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]重庆大学机械工程学院,重庆400030

出　　处：《汽车工程》2012年第6期528-533,共6页Automotive Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20100191110004)

摘　　要：建立了包含半主动悬架的4自由度车辆动力学模型,应用最优控制理论设计了车辆半主动悬架LQG控制器,并在Matlab/Simulink环境下对系统模型进行仿真。以车身垂向加速度、俯仰角加速度、悬架动挠度、轮胎动位移和悬架控制力作为车辆LQG控制的性能评价指标,采用层次分析法和改进层次分析法确定各指标的加权系数。仿真结果表明,与被动悬架相比,采用半主动悬架能有效地提高车辆的乘坐舒适性;而与层次分析法相比,使用改进的层次分析法更易于确定加权系数,更便于设计LQG控制器。A 4 DOFs dynamics model for a car with semi-active suspension is established, a LQG controller for semi-active suspension is designed by applying optimal control theory, and a simulation on system model is con- ducted under Matlab/Simulink environment. With body vertical acceleration, pitch angular acceleration, suspension dynamic deflection, tire dynamic displacement and suspension control force as the performance evaluation indicators of vehicle LQG control, the weighting coefficient for each indicator is determined with both analytic hierarchy process （AHP） and improved analytic hierarchy process （IAHP） respectively.. The results show that compared with passive suspension, adopting semi-active suspension can effectively enhance the ride comfort of vehicle, and com- pared with AHP, using IAHP can more easily determine weighting coefficients, resulting in handier design of LQG controller.

关 键 词：半主动悬架 LQG控制器 改进层次分析法 平顺性 

分 类 号：U463.33[机械工程—车辆工程]