644 構造物の回転自由度に関する周波数応答関数の推定 : 6 自由度 FRF の計測と構造変更予測への応用

概要

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The importance of rotational FRF was recognized widely, and many attempts have been made to measure those FRFs experimentally, but the satisfactory results can hardly be seen. The authors have proposed an estimation method of FRF on rotational degrees of freedom (DOFs) by adding a T-block to the structure's measurement point. In this paper, the proposed method is applied to estimate cross FRFs of the sub frame of a passenger car. A new T-square-block (T^2-block) for measurement of six DOFs (three DOFs in translation and three DOFs in rotation) is designed. Two T^2-blocks are attached to the measurement points of the car body : The T^2-blocks are excited by the impact hammer, respectively; and cross FRFs of the car body are obtained. The validity of the method is investigated by comparing the experimental model and the FE model. The estimated rotational FRFs of car body are used for structure synthesis approach.
2002-09-13