Abstract
The acoustic power radiated from a point-excited damped infinite thin plate with and without air loading (in vacuum) is obtained through numerical integration of the acoustic power integral. In those frequency ranges where the effects of air loading are not important, a closed form solution for the acoustic power is derived through direct integration of the theoretical surface acoustic intensity distribution. Three simplified power expressions are given corresponding to frequencies below coincidence, above coincidence and near coincidence. The specific contribution to the total power due to the propagating portion of the vibratory response and non-propagating or flexural near field portion of vibratory response are also studied. It is shown that (1) except at extremely low frequency or near the coincidence frequency, the effects of air loading may be neglected, and (2) when the air loading can be neglected at low frequency the propagating portion and the near field portion of the response produce the same amount of acoustic power, and the power is independent of frequency and structural damping. Above the coincidence frequency the acoustic power produced by the propagating portion of response is dominant, and depends on both damping and frequency.
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