物理座標に再変換するモード合成法 : 第1報,不拘束モード法における解析理論とダミーマス法の精度検討

概要

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A new method is proposed for analyzing complex structures by a substructure synthesis method. In this method, mass and stiffness matrices of components are expressed by unconstrained modes, and can be applied for both theoretical and experimental modal analysis. Several numbers of the modal coordinates of each component are retransformed to the physical coordinates of the connection points by using normal mode shapes. Therefore, each component can be treated as one of the finite elements in FEM analysis, making it possible to connect them to each other or one another directly or to connect them with nonlinear elements obtained by FEM. A new technique is also proposed for correcting the truncation error of higher order modes by using dummy masses at the connection points. The dummy mass technique improves the dynamic characteristics of the total system without using the residual compliance matrix. The effectiveness of the procedures is demonatrated by numerical examples.
社団法人日本機械学会の論文
1986-04-25