CN群上对称结构的双协调模态综合

在结构完整性研究中实施模态分析的成功程度颇大地取决于提取结构主模态的能力。本文提出一种新的方法 ,它把群论算法与双协调子结构法组合起来去分析回转对称 CN 结构。通过在保证精度的条件下消去子结构之间的自由度和波传播自由度 ,大幅度地减缩综合的规模 ,从而提高了提取效率。文末 ,给出了一个算例 ,以各种方法所得结果的比较 ,来阐明本方法的优越性。

DOUBLE COMPATIBLE MODE SYNTHESIS OF SYMMETRIC STRUCTURES WITH C_nGROUP

The success of implementing the mode analysis in the structural integrity research depends to a large extent on the ability to extract normal modes of the structures.In this paper,a new technique is proposed to combine the group theory algorithm and double compatible substructure method for analyzing rotationally symmetric(C_n)structures.In this method,only one sector(1/n part of a structure)is taken and considered so as to obtain the normal modes of the whole structure.But for a large complicated structure,this sector still contains a lot of degrees of freedom(DOF)and is not suitable for direct solution by finite element method.For this reason a substructure method-double compatible mode synthesis method is employed.This technique enhance the extraction efficiency with the accuracy ensured by considerable reduction of synthetic scale through elimination of interface DOF,a numerical example is given to illustrate the merits of the presented technique.