振动系统动力修改的近频耦合模态子空间摄动法  

COUPLED-MODE SUBSPACE PERTURBATION METHOD FOR STRUCTURE DYNAMIC MODIFICATION

作　　者：孙久厚[1] 朱德懋[1] 

机构地区：[1]南京航空学院振动研究所,南京210016

出　　处：《航空学报》1992年第1期A023-A028,共6页Acta Aeronautica et Astronautica Sinica

摘　　要：本文给出了对振动系统作小修改的一种近频耦合模态子空间摄动法。算例表明这种算法简单、精度高,算法可行。A coupled-mode subspace perturbation method is presented in this paper. When the structural system has closed natural frequencies, the modes are coapled and the ordinary matrix perturbation method is invalid. By use of the initial modal coordinate transformation, the coupled-mode subspaca is defined. After the next subspace modal transformation, the coupled-mode subspace perturbation method gives the complete perturbed eigensolution. The sample problems demonstrat that the method presented here is accurate and efficient.

关 键 词：结构动力学 振动分析 摄动法 

分 类 号：O342[理学—固体力学]