非完全试验信息的悬架衬套橡胶本构模型多参数识别.doc

非完全试验信息的悬架橡胶-钢衬套本构模型多参数识别 陈 宝1,3, 赵 鹏3, 雷 刚2，陈 茜3 （1.西南交通大学，机械工程学院，四川成都 610031；2.重庆理工大学，汽车零部件制造及检测技术教育部重点实验室，重庆 400054；3.重庆理工大学，车辆工程学院，重庆 400054） 摘要：鉴于衬套对悬架及整车性能影响较大，以轿车扭力梁后悬架的橡胶-钢衬套为对象，应变能函数推导确定Yeoh多项式为衬套的本构模型进行结构试验并获取X/Y/Z三向位移-力历程曲线利用HyperStudy与ABAQUS进行初始试验仿真，分析试验与仿真所得历程曲线的一致性设定Yeoh多项式的多参数C10，C20，C30、Di为优化变量并赋初始值，优化目标是面积差位移差平方为零的6类函数，采用自适应响应面法，经过14次迭代，6类函数的总加权值收敛逼近于零，识别出一组能较准确模拟衬套力学行为的本构模型参数重复试验仿真，结果发现Y向曲线拟合精度高，预紧模拟及网格歧异等导致X与Z向曲线拟合较差，但瞬态刚度值误差均在8%以内，再考虑平均误差，工程研究中可接受范围。 关键词：橡胶-钢衬套；本构模型；结构试验；多参数识别；自适应响应面法 中图分类号：U461.6 文献标识码：A 文章编号： Multi-parameters Identification of Constitutive Model of Suspension Rubber-Steel Bearing Based on Incomplete Test Information CHEN Bao1,3，ZHAO Peng3，LEI Gang2，CHEN Qian3 (1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China; 2. Key Laboratory of Manufactory and Test Techniques of Automobile Parts, Ministry Education, Chongqing University of Technology, Chongqing, 400054, China; 3. College of Vehicle Engineering, Chongqing University of technology, Chongqing, 400054, China) Abstract：In view of bearings’ greater impact on suspension and vehicle performances, a rubber-steel bearing of one car’s torsion beam rear suspension was been as a research object, Yeoh polynomial was determined as the bearing’s constitutive model by deriving from a strain energy density function. The bearing’s structure test was done to get some incomplete information of ‘displacement-force’ history test curves in X/Y/Z axial, the initial test was simulated to get ‘displacement-force’ history simulation curves in X/Y/Z axial by using HyperStudy and ABAQUS, the simulation curves were compared with the test curves to evaluate consistency between them. The multi-parameters C10，C20，C30、Di of Yeoh polynomial were set optimize variables and their initial values were given, 6 types of optimize objective functions were designated to ‘square of area difference’ or ‘square of displacement difference’ equaling to zero, 14