基于整车虚拟道路行驶试验的车辆零部件疲劳分析

针对现有车辆零部件精确疲劳分析依赖成本高昂的实车试验的问题,提出了一种利用整车虚拟样机仿真分析零部件疲劳寿命的方法。该方法通过在ADAMS/CAR中用整车虚拟样机在虚拟道路模型上进行行驶试验,利用多体系统动力学基于模态坐标的求解特点,使用模态应力恢复技术准确还原出了用于零部件疲劳寿命分析的载荷历程。将该方法应用于某车辆双横臂前悬中的下控制臂,在较短的时间内获得了该零件的预测疲劳寿命、寿命安全系数及危险部位等信息。应用结果表明,该方法可作为汽车设计过程与测试过程中的有效试验手段。

Fatigue Analysis for Auto Parts Based on the Vehicle Virtual Road Testing

Based on the vehicle virtual prototype simulation,a new method for auto parts fatigue analysis is presented to avoid the real vehicle tests.In consideration of the modal stress recovery(MSR),the method can accurately solve the flexible multi-body system dynamics under the modal coordinate.By using MSR,the loading spectra of auto parts can be acquired after the virtual prototype's road tests.Then the fatigue test of the parts can be conducted with the loading spectra.This test method was applied to a lower control arm(LCA) of a car's front independent suspension.The result indicates that this virtual fatigue test method is an effective means for auto design and test.