基于复模态的有限元模型修正算法  

Finite element model updating method based on complex mode

作　　者：陈健云[1] 王建有[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点试验室,辽宁大连116023

出　　处：《世界地震工程》2004年第2期12-16,共5页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(50209002);辽宁省自然科学基金资助项目(20022130)

摘　　要：针对地下结构地震响应分析中无限地基辐射阻尼问题,引入复模态情况下的具有非简化的堆积阻尼矩阵的阻尼模型,并针对具有集中质量阵的阻尼模型提出了合并与质量有关的阻尼和堆积阻尼的思想,并据此提出了一种修正此类有限元模型的两步法,首先从复模态参数中提取实模态参数,采用基于模态残余力的识别算法修正刚度矩阵,然后根据复模态参数和已得的刚度矩阵来识别阻尼模型中的刚度参与系数和质量阻尼堆积阻尼联合矩阵。A procedure for parameter identification with non-proportional damping is proposed to get the radiation damping of infinite medium based on complex mode data. The mass-proportional damping is combined with the node-connected damping, and the natural modes and frequencies are obtained from complex mode data. The stiffness parameters are first identified using residual modal force method, and then the damping parameters are obtained by mean iterative method. The extended multi-objective optimal modal method is applied to obtain the untested data. The numerical results demonstrate the validity and the good accuracy of the procedure.

关 键 词：复模态 地震响应 地下结构 有限元 参数识别 复合反演 参数优化 

分 类 号：O327[理学—一般力学与力学基础] P315.9[理学—力学]