摘要
为避免结构动力学分析中修正有限元模型时的大型稠密矩阵运算,研究了一种用基于矩阵逼近的有限元缩聚模型修正法。根据有限元模型的缩聚和修正,给出了试验模态的扩阶、物理模态到广义模态的映射和矩阵逼近,并讨论了结构存在重频时模态的相关性。算例表明,该法可行。
To avoid the computation of large denseness matrix in finite element model amending for structure＇s dynamics analysis, a modal updating of model reduction based on matrix approximation was studied in this paper. According to the model reduction and updating for finite element, the test modal expansion, the physical modal mapped with general modal and the matrix approximation were presented. The modal correlation was discussed when repeated normal frequencies were existed in the structure. The computation results showed that this method was feasible.
出处
《上海航天》
北大核心
2007年第5期10-13,共4页
Aerospace Shanghai
基金
中国工程物理研究院资助(4210505)
关键词
动力学分析
矩阵逼近
模型缩聚
模型修正
模态扩展
模态相关性
Dynamics analysis
Matrix approximation
Model reduction
Model updating
Modal expansion
Modal correlation
