308 構造物の回転自由度に関する周波数応答関数の推定(精度の改善と相互周波数応答関数の推定)

概要

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In conventional vibration testing, measurement of frequency response function (FRF) has been limited to translational degrees of freedom (DOF). Rotational DOFs have not been treated in experimental analysis. However, the rotational DOF is indispensable in further analysis, such as substructure synthesis, prediction of structural dynamics modification, etc. FRF measurement on rotational DOFs is essential for expanding applicability of experimental modal analysis. A new method for rotational FRF estimation of structures has been proposed by the authors. The estimation procedure of the method is : attach a T-block to the measurement point of the structure, excite and measure on rotational DOFs as well as on translational DOFs from the sensors on the T-block, and finally estimate FRFs in rotation and in translation. The following are focused in this paper : I) improvement of accuracy in rotational FRF measurement, II) development of cross FRF estimation method on rotational DOFs. These are vital to extend the availability of the method. The feasibility of the method is investigated experimentally by applying it to a beam structure. The method is applied to substructure synthesis method by using experimental models.
一般社団法人日本機械学会の論文
2000-09-01