モード歪みエネルギー法とFEMを援用したSEAの内部損失率の一同定法（L字結合された平板制板橋造への適用）

摘要

CAEの主流となっている有限要素法（Finite Element Method：FEM ）は，高周波数域や大きなモデルの解析では，要素数やモード数が多くなり，計算時間が膨大になる場合がある．これらのFEMの弱点を補う方法として波数が多いモードが多数同時に発生している状態を統計的に扱う統計的エネルギー解析法（Statistical Energy Analysis Method；SEA法）が知られている．%This paper describes about a proposal of an identification method of internal loss factors (ILF) for Statistical Energy Analysis (SEA) by using FEM and Modal Strain Energy Method (MSE). It is known that modal damping of structure is influenced by the shape and connection of the structures. We proposed a new identification method of ILF using the FEM considered in damping coupling between SEA elements. We verified the identification method using the model consisted of two flat plates connected in L-type shape with viscoelastic damping layers. By SEA using the identified ILF, vibration level differences between the flat plates could be predicted practically.