モーダル差分構造法とGuyanの静縮約による区分モード合成法の一般化

摘要

有限要素法による現構造の振動や騒音解析結果を利rn用して，構造変更の効果を短時間で予測する手法を提案rnし，モーダル差分構造法と称した．%Modal differential substructure method that can quickly predict the effects of structural modifications has been proposed by the author. This method is a kind of the component mode synthesis and utilizes the reduction of degrees of freedom for unmodified parts. For calculation accuracy improvement of the proposed method, a combination with the static condensation (Guyan reduction), which is similar to the fixed-boundary dynamic reduction, is investigated. The formulation is a generalization of the component mode synthesis method which can be combined with any kind of deformation patterns. The prediction accuracy and efficiency depend on deformation patterns used for the coordinate transformation. More accurate reduction components are generally obtained with modes under boundary conditions similar to the assembly.