基于多通道随机载荷的某车中冷管支架疲劳寿命分析

结合随机振动理论,以某车型中冷管为例介绍了产品在多通道随机激励下的疲劳分析方法,并分析了中冷管支架在多通道随机激励下的疲劳性能,分析结果显示其失效位置与试验中支架开裂情况一致。根据分析结果,对支架结构进行了优化,并重新分析了疲劳寿命,其寿命结果比原模型有显著改进。由于该方法可以方便、有效地进行疲劳计算,且能够得到比较可靠的结果,所以比较适用于汽车结构件的疲劳寿命分析。

Fatigue Analysis of an Inter-cooler Pipe Bracket in a Certain Vehicle based on Multiple Random Load

A simulation method is presented for fatigue analysis that are subjected to multiple random excitations.As an example case,an inter-cooler pipe bracket in a certain vehicle is analyzed.The area of fatigue failure in the analysis result is consistent with fatigue crack encountered during test.Base on the result of analysis,the structure of bracket has been optimized and re-analyzed.The result proves that the fatigue life has significant improvement.Our works illustrate this method can not only calculate fatigue life efficiently,but also can obtain reliable result.So it is suitable for the fatigue life analysis of vehicle structural components.