基于子结构的有限元模型修正方法

发布时间：2018-03-11 01:02

本文选题：有限元模型修正　切入点：损伤识别　出处：《振动与冲击》2017年04期 　论文类型：期刊论文

【摘要】：提出了一种基于子结构的有限元模型修正方法。该方法将整体结构有限元模型划分为多个子结构模型,求解独立子结构的主模态特征解和特征灵敏度;通过位移协调条件和能量方程,约束相邻独立子结构,得到整体结构的特征解和特征灵敏度;并以整体结构模态和结构试验模态的残差为目标函数,通过调整子结构单元参数,完成有限元模型修正。当结构局部参数发生变化,通过分析某一个或几个子结构即可求解整体结构特征解和特征灵敏度,而不需要分析其他未发生变化的子结构。由于子结构模型尺寸远小于整体结构,该方法能够极大地提高有限元模型修正方法的精度和效率。
[Abstract]:In this paper, a substructure-based finite element model modification method is proposed, in which the finite element model of the whole structure is divided into several substructural models, and the principal modal eigenvalues and eigenvalues of independent substructures are solved. Through the displacement coordination condition and energy equation, the characteristic solution and characteristic sensitivity of the whole structure are obtained by constraining the adjacent independent substructure, and the residual of the whole structure mode and the structural test mode is taken as the objective function, and the parameters of the substructure unit are adjusted by adjusting the parameters of the substructure unit. The finite element model modification is completed. When the local parameters of the structure change, the characteristic solutions and eigenvalues of the whole structure can be solved by analyzing one or more substructures. Because the size of the substructure model is much smaller than that of the whole structure, this method can greatly improve the accuracy and efficiency of the finite element model modification method.
【作者单位】：华中科技大学土木工程与力学学院控制结构湖北省重点实验室;武汉理工大学土木工程与建筑学院;
【基金】：国家自然科学基金(51328802;51108205) 中央高校基本科研业务费专项资金(2014TS130;2015MS064) 武汉城建委科研项目(201511)
【分类号】：TB115

【相似文献】