液压互联悬架关键参数对车辆频响特性的影响

针对液压互联悬架设计参数影响车辆动力学响应的问题,建立整车7自由度机械-液压耦合动力学频域模型,推导了侧倾与俯仰角加速度、垂向加速度与轮胎动载荷的频域响应函数,分析液压互联悬架系统油压、蓄能器体积、前后液压作动器上下腔面积差与面积比等参数对车辆动力学特性的影响.仿真结果表明,油压与蓄能器体积对车辆频域响应的影响呈现相反的相关性,作动器上下腔面积差对频域响应的影响较大,上下腔面积比仅对侧倾角加速度和轮胎动载荷功率谱有明显影响.最后,进行样车性能试验,仿真与试验结果的误差较小,关键参数对车辆频率响应特性的影响趋势具有较好的一致性.

Influence of Key Parameters of Hydraulically Interconnected Suspension on Frequency Domain Characteristics of Vehicles

To investigate the influence of the parameters of the hydraulically interconnected suspension on the responses of a vehicle, a 7-DOFs (degrees of freedom) frequency domain model of the vehicle coupling with hydraulically interconnected suspension was established, and the frequency response function of roll angle acceleration, pitch angle acceleration, vertical acceleration on the center of mass, and vertical force on left-rear tire were then deduced. The parametric effects of the hydraulically interconnected suspension including the system oil pressure, volume of the accumulators, the differences and ratios between the areas of the two chambers of the cylinders on the dynamic response characteristics of the vehicle were evaluated. The results show that the system oil pressure has the adverse correlation with the volume of the accumulators on the frequency domain responses, the differences between the cylinder areas play a significant role on the responses, and the ratios between the cylinder areas have a certain effect on the responses of the roll angle acceleration and the tire forces but limited effect on the others. The performance test of the vehicle was taken to verify the simulation model, which shows that the influences of the key parameters on the frequency response characteristics of the vehicle are in a good accordance.