减振器阻尼对扭力梁疲劳寿命的影响

摘要

为了研究减振器阻尼对扭力梁疲劳寿命的影响,建立了扭力梁有限元模型以及刚柔耦合整车模型.通过试验采集强化路面道路载荷谱作为整车模型的输入激励,仿真得到疲劳寿命分析所需文件,利用模态应力恢复法对扭力梁进行疲劳寿命分析,并通过扭力梁耐久性台架试验证明了仿真模型与疲劳寿命分析方法的准确性.仿真得到了不同阻尼系数下的扭力梁疲劳寿命分布云图以及最小疲劳寿命循环数,分析结果总结出了减振器阻尼大小对扭力梁本体疲劳寿命的影响规律.%In order to study the effects of shock absorber damping on the fatigue lifes of the torsion beams,the finite element model and rigid flexible coupling model were set up.The road load spectrum collected by experiments on strengthened test pavement was used as the input excitation of the vehicle model,and documents of the fatigue analysis could be gotten by the simulation ,then the fatigue ana-lyses of torsion beams could be conducted by modal stress recovery,the accuracy of the results could be proved by the bench text of durability.Finally,the contours of fatigue lifes and the minimum fa-tigue life cycle with different damping coefficients would be obtained ,and the effects of the shock ab-sorber damping on fatigue lifes of the torsion beams might be known.