制振材積層平板の振動と音響放射

概要

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Vibration and sound radiation of visco-elastically damped rectangular plates which were held between a pair of frames and clamped at the edges were evaluated analytically. The modal properties and modal damping loss factors of the plates were calculated by the FEM analysis and the modal strain energy method. The loss factors of the applied damping material were obtained from the reduced-temperature homogram based on the Oberst beam measurements. A practical consideration for the modal strain energy method to use the materials with frequency-dependent properties was illustrated. The modal frequencies and loss factors of the test plates were measured by the experimental modal analysis method and the half-power bandwidth method in a thermostatic chamber. The comparisons between the analytical and measured results showed good agreement for various plate modes. The vibration responses of the point--exited plates were estimated using the obtained modal properties. The predicted transfer functions between the applied forces and the vibration responses were compared with the experimental results. Finally, the radiated sound field was evaluated by the BEM analysis using the vibration responses of the plates.
社団法人日本機械学会の論文
1999-05-25