一种汽车磁流变半主动悬架的研制

摘要

为了改善车辆平顺性和行驶安全性,设计了一种基于单出杆式磁流变减振器的汽车半主动悬架.在分析传统的磁流变减振器力学模型的基础上,提出了一种改进的磁流变减振器多项式模型,试制了磁流变减振器样机,进行了磁流变减振器的力学特性试验,设计了半主动悬架天棚控制器、地棚控制器和LQG控制器,进行了不同控制策略的对比仿真分析,开发了磁流变半主动悬架试验测试系统,开展了该磁流变半主动悬架的LQG控制台架试验测试.结果表明,所研制的磁流变减振器耗能效果良好,能够最大限度地发挥振动衰减功能.与被动悬架相比,在4Hz和5Hz正弦激励下磁流变半主动悬架的簧载质量加速度分别降低15.80％和23.36％,在随机路面激励下簧载质量加速度降低19.46％.%Ahstract:A kind of vehicle semi-active suspension with single pole magnetorheological damper was designed to improve good ride comfort and stability.Based on the analysis of traditional polynomial model for magnetorheological damper,an improved polynomial mechanical model of magnetorheological damper was put forward.The physical prototype of the magnetorheological damper was made and the mechanical property tests of magnetorheological damper were done.The sky hook controller,ground hook controller and LQG controller for the semi-active suspension were designed and the simulation analyses for different control strategies were carried out.The suspension test system was developed.Then,the bench?tests of the LQG semi-active suspension with the magnetorheological damper were completed.The results show that the magnetorheological damper has good energy dissipation effect and the maximum dampingfunction.Compared to traditional passive suspension,under the sine excitation with 4Hz and 5Hz,the acceleration of the semi-active suspension respectively drops by 15.80％ and 23.36％.Under the random road excitation,the acceleration of the semi-active suspension drops by 19.46％.The damping effect of the developed semi-active suspension with magnetorheological damper is obvious.