振動解析効率化のための固有モード分類手法の提案(機械力学,計測,自動制御)

概要

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In a recent vibration analysis using CAE, the detailed finite element model which has large number of DOF came to be used. By using the detailed model, the number of mode in unit interval of frequency increase, and the large amount of computational cost and time is required to establish effective countermeasures. In this paper, the new analytical method is proposed to raise the efficiency of analysis by classifying the eigenmodes in the frequency range of high mode density into several groups. Almost all of global structures are consist of many substructures, and the eigenmodes of global structure is composed of combination of eigenmodes of these substructures. In this case, it is important for an analyst to understand the relationship between vibration characteristic of global structure and substructures. Therefore, in the proposed method, the types of each group are defined by the similarity of the mutual relationship between the global modes and substructure modes. The proposedmethod is verified to a finite element model that is a simplified automobile body in white. In this validation, 22 modes are set as the target modes. As a result, these modes are classified into 7 groups by proposed method and the validity of classification result was confirmed.
社団法人日本機械学会の論文
2009-06-25