Vibration and Sound Radiation Analyses of piezo-electrically Excited Plates
The purpose of the study is to investigate the vibration characteristics and the performance of sound pressure level (SPL) of piezo-electrically excited radiating plates. For the experimental design, the piezoelectric plates was bonded with the copper plate, and the structure was supported by elastic suspensions around the surrounding of the copper plate. Three different structures of the radiating plates were analyzed. The natural frequency and the sound pressure were measured from the experiments. In comparison with the FEM software-ANSYS, the results of the experiments were used to study the effects of different designs of the radiating of the radiating panels on the SPL curve and verify the suitability of the models in predicting sound radiation. The influences of the parameters, such as the material constants, boundary conditions and the shape of the structures, on the SPL were explored in this thesis. According to the results of the analyses, it is possible that a proper design of the structure of a radiating panel can improve the narrow application of traditional piezo-electrically excited plates which can only find applications in high frequency range.
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