直交化モードを用いたモード合成法の精度向上

概要

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Improved methods on the Component Mode Synthesis (CMS) are proposed, using both unconstrained flexible modes and physical boundary displacements as the generalized coordinates, to facilitate the effective application to the dynamic analysis in the structural design procedure. A component can be treated as one of the elements of FEM analysis, if their connection points are in the physical coordinates. But utilization of unconstrained modes makes the analysis sensitive to higher mode truncation effects. The static modes are introduced to compensate for the truncation errors. By using mode orthogonal transformations, it is found that the errors are substantially reduced. Two methods are derived depending on the method of transformation, regulated on either normal modes or static modes. These theories are applied to a simplified satellite model. From these examinations, it is proved that the proposed methods are as accurate as those established methods using constraint modes.
社団法人日本機械学会の論文
1989-03-25