固定界面子结构模态综合法再研究

针对固定界面子结构模态综合法经过变换组集后的整体结构动力学方程的阶数必须包含所有子结构间界面节点的自由度数,如果界面的节点自由度数很大,必然造成整体方程也很庞大,给计算带来困难的不足,提出了如下解决方案将所有界面节点作为一个广义子结构,对该子结构也像其它子结构一样,进行模态分析,取其前若干个模态作为保留主模态.这样,由于这个广义子结构的保留主模态数可以远小于其自由度数,组集后的整体方程的阶数就可以大大减小.

Advanced Research in Fixed-Interface Mode Methods of Substructure Coupling

The fixed-interface mode methods of substructure couplings is one of the familiar substructure dynamics analysis methods.This method shows a simply computing procces and accurate reliable results in general.But it is present in this method that all the degrees of inter-face nodes are included in the final structural dynamics equation.So the final equation may be huge and computation is difficult.We have raised a new way as follows to solve the question.We make all interface nodes as ageneralized substructure and keeps some modes of fewer frequences after making modal analysis as other substructures.Because the kept modes may by less than the freedom degrees,the orders of final equation can be reduced greatly.