磁流变减振器半主动悬架的系统时滞

Time Lag of Magnetorheological Damper Semi-active Suspensions

时滞导致磁流变减振器可控阻尼力的不同步,降低了车辆半主动悬架的性能及其稳定性,因此时滞问题是近年来半主动悬架的研究热点之一。基于RD-1005-3磁流变减振器的响应特性,在半主动悬架临界时滞理论分析的基础上,建立含有时滞的磁流变半主动悬架的数学模型与传递函数,分析时滞对悬架幅频特性的影响;通过对临界时滞数值解的分析,为磁流变半主动悬架控制系统的时滞研究提供理论依据。在模糊控制策略的基础上,运用Smith预估补偿控制对系统进行时滞补偿,并在Matlab中进行仿真分析。对搭建的单质量磁流变半主动悬架系统进行台架试验,仿真和试验数据均表明进行时滞补偿的系统很好地改善了悬架性能。

Time delay causes unsynchronized controllable damping force of magnetorheologieal damper, which degrades the performance and stability of vehicle semi-active suspension, therefore time-delay problem is one of the hot spots of research on semi-active suspension. Based on the response characteristics of RD-1005-3 magnetorheological damper and the theoretical analysis of critical time delay of semi-active suspension, the mathematical model and the transfer function of magnetorheological semi-active suspension with time delay are established, and the effect of time delay on the amplitude frequency characteristics of suspension is analyzed. Through analyzing the numerical solution of critical time delay, theoretical basis is provided for the research on time-delay of control system of magnetorheological semi-active suspension. Based on fuzzy control strategy, Smith forecasting compensation control is used to carry out compensation of time delay for the system, and simulation analysis is carried out in Matlab. Bench test is carried out for the built single mass magnetorheologieal semi-active suspension system, and the data of simulation and test show that the time delay compensated system improves the oerformance of suspensions well.