含主动悬架的汽车振动结构虚拟激励仿真

Pseudo Excitation Simulation of Vehicle Vibration Structure with Active Suspension

由于虚拟激励法理论在含有主动悬架的汽车振动分析中应用很少,以含有主、被动悬架的1/4汽车2自由度模型为例,建立了汽车振动微分方程。根据虚拟激励法基本理论构造了路面的虚拟激励,以振动结构的频率响应函数为桥梁,建立了虚拟响应,由虚拟响应给出了真实响应的统计特性。通过对比,含主动悬架的汽车虽损失了一些行驶安全性能,但乘坐舒适性有很大提高,同时也说明虚拟激励法理论适用于含主动悬架的汽车随机振动分析。

For pseudo excitation theory is rarely used in the analysis of vehicle vibration with active suspension,the differential equation of vehicle vibration is established by taking the two-degree-o f-freedom model of 1/4 automobile with active suspension as an example.According to the basic theory of pseudo excitation method,the pseudo excitation of road is constructed.The frequency response function of vibration structure is taken as the bridge to establish the pseudo response.The statistical characteristics of real responses are given by the pseudo response.Through comparison,the car with active suspension has lost some driving safety performance,but its ride comfort has been greatly improved,which also shows that the theory of pseudo excitation method is applicable to the random vibration analysis of the vehicle with active suspension.