708 圧電スピーカの振動と放射音特性に関する実験的検討

概要

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Recently, the demand for the loudspeaker with sharp acoustic radiation directivity has increased to have to transmit the guide and the explanation to many and unspecified persons selectively in the library, the museum, and the amusement facilities. The purpose of this study is acoustic radiation control by the changing design factor of the PZT loudspeaker. Our past study, it confirmed that acoustic radiation directivity changed by moving oscillator position. In this paper, vibration analysis is carried out to observe modal shapes of vibration board. And, PZT loudspeaker is driven some frequencies which gives modal shapes, and measured acoustic radiation characteristics with microphones. In order to considerate a relationship between modal shapes and acoustic radiation, numerical analysis by the Rayleigh integral method are carried out. Results of flat diaphragm analysis show that acoustic radiation characteristics are according to modal shapes in low frequencies. And numerical analysis was corresponding to the outcome of an experiment in up to about 1300Hz.
一般社団法人日本機械学会の論文
2011-09-05