基于载荷谱的轿车后车身耐久性能分析

The Rear Body Durability Analysis of Passenger Car based on Load Spectrum

本文以中心开发的乘用车后车身的疲劳耐久特性作为研究对象,截取整车后半部分白车身建立有限元模型,以实测车轮六分力载荷谱经多体动力学仿真分析输出的后悬架安装点激励作为疲劳计算的载荷输入。在此基础上,通过疲劳仿真分析软件FEMFAT分别对开发车与竞品车后车身疲劳寿命进行了对比分析,并将仿真分析结果与试验结果进行了对标,为该乘用车车身的设计开发及改进提供重要依据。

This paper focused on the rear part of the body＇s durability of the vehicle which developed by the technological center, the multi-body dynamics model was established to calculate the load spectral by extracting suspension attachment forces which measured by the six force measuring instrument. Then the BIW and weld finite element model was established followed. The fatigue analysis software FEMFAT was used to calculate the durability life and the analyzed durability results was marked with the competing vehicle and tests finally. This analysis proposed in this paper provides an effective way of BIW＇s durability prediction and improvement.