| Summary: | 博士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 96 === Although statistical energy analysis (SEA) is a suitable framework for predicting sound transmission through double leafs, it has been found that when excited acoustically, conventional SEA does not predict the non-resonant response of structure. In this paper, sound transmission through single-leaf and multileaf partitions is considered. Two modified SEA models have been construct to study sound transmission through different partitions. The paper’s findings show that the predictions of sound transmission and structure response can lead to significant errors if the non-resonant response is not considered.
Furthermore, this study investigates non-resonant responses of isotropic and orthotropic plates to acoustically induced vibrations in a reverberation chamber. A modified SEA model is introduced to predict the non-resonant plate response. The estimated non-resonant and resonant responses are then compared with those obtained experimentally, and good agreement is observed for isotropic and orthotropic plates. For an isotropic plate with a small dissipation loss factor, when the non-resonant part is ignored, the estimated response can lead to significant errors at frequencies near and above the critical frequency, while large errors may occur at frequencies below the critical frequency for an orthotropic plate with a high dissipation loss factor. The experimental study indicates that the non-resonant response component should be included in the estimated responses to enhance predictive accuracy.
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