基于实测载荷谱的AMT换挡箱体疲劳寿命预测

Life Prediction of AMT Shifting- gear Case based on the Real Measured Load Spectrum

以某电控机械式自动变速器(AMT)换挡箱体为研究对象,考虑发动机和路面振动激励的影响,通过合理布置传感器,在襄阳汽车试验场采集了AMT换挡箱体振动载荷谱,并对载荷谱进行了预处理和重复性检验。通过载荷谱应力最值比较发现,部分测点为危险区域,是结构设计和改进需要重点考虑的地方。结合疲劳累积损伤原理对目标测点的疲劳寿命进行了分析计算,对换挡箱体可靠性分析和局部结构完善具有重要意义。

By taking the AMT transmission shifting- gear case as a studying object and taking the influence of the engine and road vibration into account,the vibration load spectra of AMT are collected in Xiangyang Proving Ground through reasonably installed the sensors. Besides,the pretreatment and repeatability checking of load spectra is carried out. Through the comparison of different load spectrum stress,it is found that several measuring points are dangerous point,so that should focus on these place when designing. Combining with the fatigue damage theory,the fatigue life of target point is calculated and analyzed,and it has an important significance to improve the reliability of product.