基于子结构分析的动态载荷和模型参数复合反演研究  

RESEARCH ON COMPOSITE INVERSION OF DYNAMIC LOADS AND STRUCTURAL PARAMETERS BASED ON SUB-STRUCTURE ANALYSIS

作　　者：刘以龙[1] 刘杰[1] 刘江南[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：《机械强度》2013年第5期553-558,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金(11202076);装备预先研究项目(62501036012);教育部博士点基金(20120161120003);国家重点基础研究发展计划973项目(2010CB83700)资助~~

摘　　要：针对结构特征参数、输入激励和输出响应等信息不完备的系统,基于子结构方法提出一种时域内动态载荷和模型参数复合反演的方法。首先,将结构划分成不同的子结构,对存在动态载荷的子结构建立有限元模型,该子结构与其他部件之间的连接关系采用等效的界面力代替。采用Green核函数法建立识别该子结构所受动态载荷的正问题模型,利用正则化方法实现时域内动态载荷的稳定识别。然后,在已识别载荷的基础上建立整体结构的有限元模型,通过非线性最小二乘法实现结构的未知模型参数的识别。数值算例表明,在响应存在测量噪声的情况下,所述的复合反演方法能够有效稳定地实现动态载荷和模型参数的复合反演。In the time domain, a composite inversion procedure is presented to identify the dynamic loads and structural parameters for a structure with limited output observations and unknown input based on sub-structure analysis. Firstly, the structure is decomposed into several sub-structures and the finite element model of the sub-structure with unknown input is built. Its connecting relationship with others is replaced by the interface forces. The forward analysis model of the dynamic load identification is established by Green＇ s function. Based on regularization method, the time history of dynamic load can be stably reconstructed. Then, the finite element model of the global structure is built on the basis of identified dynamic loads, and the structure parameters are identified through nonlinear least squares method. The numerical example indicates that the presented composite inversion is effective and stable for the loads and structural parameters identification with noisy response.

关 键 词：复合反演 载荷识别 参数识别 子结构分析 

分 类 号：TH113.1[机械工程—机械设计及理论]