基于整车刚弹耦合模型的平顺性仿真与试验

摘要

Ride Comfort is one evaluation index of the vehicle performances,so the effectiveness of a scheme for comfort forecasting is vital.The dynamics equation of wheel-suspension system and the transfer function were introduced in the paper.Every assembly of a SUV was established in the adams/car,in which a flexible body was built based on the theory of multi-flex-dynamics.A rigid-elastic coupling mode (REC) was assembled,which was used for a simulation study on vehicle ride comfort.A finite element body was built with the finite software Hyperworks.The FFT was carried out for the vibration acceleration time function to acquire the frequency domain function and power density function using the adams/processer.Then the data were processed to get two comfort evaluation indexes aw and Law through the Matlab.A vehicle ride comfort experiment was taken on the SUV,and the experiment results were processed through the software DH5902.Compared the simulation with the test,the reasons of the error were analyzed.%车辆的平顺性车辆性能的一项重要评价指标,所以平顺性预测方案的有效性至关重要.根据车轮-悬架系统动力学方程和传递函数,并以某SUV(Sport Utility Vehicle)为原型,在adams/car中建立车身柔性体和其它各总成刚体模型装配得到整车刚弹耦合模型,进行车辆平顺性仿真分析.采用有限元软件hyperworks建立车身有限元模型,利用adams/processor对.振动加速度时间函数进行FFT(快速傅里叶变换)得到频域函数和功率密度函数,再通过matlab对数据进行处理得到两项平顺性评价指标aw和Law的值.应用便携式车载仪器对SUV进行道路试验,并用DH5902软件进行试验数据处理.将仿真与测试进行比较,结果可为车辆稳定性优化设计提供依据.