轿车后减振器上支座优化结构的疲劳寿命

为缩短某车后悬挂总成的更换维修时间,基于将其后悬挂变成总成模块的想法,对该车后悬挂系统进行结构优化.以改进后的后减振器上支座为研究对象,对该零件的结构强度进行有限元分析,确定零件上应力最大的危险点.通过建立实车试验系统,对该零件的危险点在试车场强化道路上的应变进行了测量,然后经过试验室台架力-应变标定的方法反求出该零件在强化道路上实际所受到的外荷载.同时利用单级加载的方法求得该零件的韦勒曲线,结合强化道路上的外荷载谱,利用疲劳线性累积损伤理论(又称Miner法则)计算出该零件在标准规定的15000km强化道路上的损伤值,计算结果表明改进结构的零件疲劳寿命偏安全.另外,利用道路模拟试验对该零件的疲劳寿命进行了试验验证,结果证明该零件能安全通过强化道路15000km而不发生疲劳失效.

Fatigue Analysis for Optimized Car's Rear Shock Tower

To shorten the maintenance and part replacement time of the car's rear suspension assembly,the structure of the rear suspension assembly was optimized.Taking the modified part,the car's rear shock tower,as the study object,an FEA strain-stress analysis was performed to determine the critical points.The whole vehicle test system was built and the proving ground tests were carried out so that the real strain on the part was measured.Based on the road measurement data and the part's S-N curve,the cumulative damage(Miner's rule)of the 15 000 km proving ground test road was calculated.The calculation result indicates that the optimized structure is safe for fatigue analysis.Meanwhile,the road simulation test of this part was carried out,the test result shows that the part can be over 15 000 km proving ground test road without fatigue failure.