328 制振材を貼付した平板からの音響放射パワーの推定

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This paper describes the estimation of sound power radiating from a steel plate partially attached with a sheet of unconstrained damping material. For that purpose the approximate analysis method of flexural vibration of the steel plate has first been proposed. In the method the attached portion of unconstrained damping material is treated as a simple plate equivalently, the mode functions of a simple plate are adopted as those of the steel plate partially attached with the sheet of unconstrained damping material, the region of integration for calculation of energy is divided into the portions attached with and without the sheet of unconstrained damping material and the corresponding physical parameters are used for integration, and Rayleigh Ritz method is finally applied. The calculated mode shapes, natural frequencies, and modal loss factors coincided well with the values obtained experimentally for all the tested steel plates : namely, a steel plate fully attached, and three stell plates partially attached with different patterns. The proposed approximate analysis method is hence effective to solve the flexural vibration of a plate attached partially with a sheet of unconstrained damping material. Next, the sound power radiated from the steel plate steadily excited was estimated using the theoretically obtained modal parameters and was compared with the experimental values obtained with the method of sound intensity. The estimated sound radiation power coincided well with the experimentally obtained values, as the result.
一般社団法人日本機械学会の論文
2000-09-01

328 制振材を貼付した平板からの音響放射パワーの推定

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