基于解耦型GMDH的车身材料参数反求  

Inverse Determination of Material Parameters Based on Decoupled GMDH Algorithm

作　　者：殷为洋 王琥[1] 冯慧[1] 汤龙[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《中国机械工程》2015年第9期1215-1221,共7页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(11172097;61232014);新世纪优秀人才支持计划资助项目(NCET-11-0131);湖南省自然科学基金资助项目(11JJA001);国家高技术研究发展计划(863计划)资助项目(2012AA111802)

摘　　要：动态载荷作用时,具有应变率效应的材料在碰撞仿真中会展现出不同于静态载荷时的性能,准确的材料参数是获得可靠仿真结果的前提。主流的近似模型优化方法忽略了对变量间耦合关系的判定,造成近似模型中存在不必要的耦合项,增大误差项所占比重,降低模型的效率和泛化能力。为此,提出了解耦型数据分组处理方法(GMDH),在建模初期判断变量之间的耦合关系,进而确定模型的耦合项。在高维非线性函数测试中,该方法表现出优良的建模性能;将该方法与台车试验结合,反求出两种材料构成的拼焊板参数,与试验结果的对比表明,该反求方法具有较高的精度。Since materials with strain rate effect showed different performances in crash simulation compared with they were under static conditions,accurate constitutive model parameters were the premise of reliable simulation results.The determination for the coupling relationship among the input variables was ignored during the construction program in traditional metamodel method,there would be coupled terms which were not necessary,on the contrary the proportion of the error term could be increased and efficiency and generalization ability of the metamodel were reduced.To deal with this problem,a decoupled GMDH algorithm was proposed：there would be a judgment process for the cou-pling relationship of all the input variables before the construction process,and the results are taken to determine whether choose the coupled term.In the test program of high dimension functions,the algo-rithm could provide accurate metamodel.Based on the trolley test,the method was implemented into match of the material parameters for two kinds advanced high-strength steel,and the results show that this algorithm owns good modeling performance.

关 键 词：应变率效应 耦合关系 解耦型数据分组处理方法(GMDH) 近似模型 

分 类 号：U467[机械工程—车辆工程]