Estimation of Noise Emitted by Vibration of a Plate : 1 st Report Relationship between Vibration and Radiated Noise of a Circular Plate

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On a running machine, the band frequency components of vibration at each portion of the external surfaces are classified into two categories. One is a stationary component and the other is a non-stationary one. This paper describes an approach to estimation of the noise emitted by each of them. In the former case, assuming that the vibrating plate consists of many minute elements and each of them vibrates in a simple harmonic motion, the sound pressure levels can be estimated by summing up all the sound pressures radiated from each minute source. In the latter case, the radiation efficiency which is defined as a coupling co-efficient between surface vibration and radiated acoustic power can be calculated as a function of density, thickness and stiffness of each plate. The acoustic power levels estimated by using this radiation efficiency and the mean square average of vibration acceleration have been found to be in good agreement with those obtained from the experiment.
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