后扭力梁轴头载荷谱仿真及疲劳寿命预测  

Simulation of Load Time History of Spindle Nose and Fatigue Life Prediction for Rear Torsion Beam

作　　者：罗明军[1,2] 侯之超[2] 宋立新[2] 毛显红 

机构地区：[1]南昌大学机电工程学院,南昌330031 [2]清华大学汽车安全与节能国家重点实验室,北京100084 [3]重庆长安汽车股份有限公司汽车工程研究院,重庆401120

出　　处：《西安交通大学学报》2013年第9期106-111,共6页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50965014);江西省教育厅青年科学基金资助项目(GJJ11034)

摘　　要：为了更准确预测后悬架扭力梁疲劳寿命,对后扭力梁轴头载荷时间历程进行了动态仿真和试验验证。采用多体动态仿真软件ADAMS建立了虚拟样机模型,运用扫频技术得到系统的传递函数,以样车道路实测悬架弹簧垂向位移为参考,利用反求迭代法获得了轴头载荷的时间历程,并通过台架试验对其准确性进行验证,结合部件的S-N疲劳特性曲线,采用准静态法和PalmgrenMiner线性累计损伤法对后扭力梁结构的疲劳寿命进行了预测。结果表明,后扭力梁结构最低寿命为76.4周,而较低寿命区位于横梁中间固定垫片的焊点处,并与实际相符。通过获得的后扭力梁轴头的载荷信息,可以准确地预测结构疲劳寿命,对结构载荷的迭代仿真和寿命预测具有一定的工程应用价值。For revealing fatigue failure mechanism and accurately predicting fatigue life for rear torsion beam suspension of a car, load time history of a spindle nose is simulated and verified via dynamic analysis and test. The dynamic simulation model of rear torsion beam suspension is established with integrating multibody dynamic analysis software ADAMS. The system transfer function is solved by sweep frequency technique. Associating with the measured suspension spring displacements on a sample road, the load time history of spindle nose is acquired by dynamic iterative simulation and verified by bench test. Combining with the S-N of fatigue characteristic curve, the fatigue life of the rear torsion beam suspension is evaluated by quasi- static stress analysis and Palmgren-Miner linear cumulative rule. The minimum life is 76.4 cycles, which coincides with the real situation. Thus the load time history on spindle nose can be effectively acquired by dynamic simulation and finite element method, furthermore the structure fatigue life can be accurately predicted.

关 键 词：后扭力梁 载荷谱 迭代仿真 疲劳寿命预测 

分 类 号：O463.1[机械工程—光学工程] U467[理学—电子物理学]