摘要
关于改善车辆的行驶平顺性问题,由于行驶路面激励,存在不稳定因素,应调节悬架系统的刚度和阻尼,改善行驶的平顺性。为解决上述问题,提出采用主动悬架H∞输出反馈控制策略。根据线性矩阵不等式方法,在控制器设计中,假定悬架动行程及车身竖向加速度可以量测,同时考虑量测噪声;在控制输出向量选取上,以降低车身竖向加速度响应为目标,同时兼顾悬架最大动行程及轮胎动挠度。对于控制系统的数值仿真,通过引入虚拟激励,直接由道路谱得到车辆响应的精确功率谱密度。数值仿真结果表明,具有H∞输出反馈控制器的主动悬架对车辆行驶平顺性的改善有良好的效果。
Based on the linear matrix inequality method, an H∞ output feedback controller was designed for a quarter car model to improve its ride comfort. As it is impossible to measure all state variables for vehicle suspension control problems, only the suspension travels and the vertical accelerations of vehicle body were assumed to be meas- ured. Measurement noises were also considered. The control outputs were selected to keep the maximum acceleration of the vehicle body low whereas to avoid excessive suspension travel and dynamic tyre deflection. By introducing the pseudo excitations, a highly efficient simulation method was adopted for the active vehicle suspension systems. For the new simulation method, the power spectral density functions of vehicle responses can be obtained precisely, and only the road surface elevation power spectral density is needed. Numerical results show that the H∞ output feedback controller can improve the ride comfort better.
出处
《计算机仿真》
CSCD
北大核心
2012年第11期374-377,共4页
Computer Simulation
基金
国家重点基础研究发展计划(2010CB736103)
关键词
主动悬架
平顺性
输出反馈
虚拟激励
功率谱
Active suspension
Ride comfort
Output feedback
Pseudo excitation
Power spectral density
