音響放射パワーが小さな振動モードの探索とその特徴

概要

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The overall aim of this research is to establish an optimum design method to obtain quiet structures by modifying their shapes. For this purpose, the quantity to evaluate radiation loss factor was first led from approximate calculation, and then the relationship between mode shapes and radiation loss factors were investigated by using the evaluation quantity, because radiation loss factor is one of the important parameters required to estimate sound radiation power and has the strongest relation with sound radiation power among the parameters. As the result, the followings were found; (1) the evaluation quantity is the sound intensity with respect to the largest displacement point of vibration, (2) the mode shapes with minimum radiation loss factor have plural nodal lines and / or circles, and (3) radiation loss factor, namely sound radiation power, is more reduced when the number of nodal circles increases than when the number of nodal lines increases.
一般社団法人日本機械学会の論文
1999-05-25