Acoustic radiation from baffled planar sources: A series approach

The acoustic radiation from harmonically vibrating planar sources (pistons and thin plates) is investigated. Triangular, rectangular, circular, and elliptical sources are studied. Clamped and simply supported boundary conditions are considered for plates. The farfield acoustic pressure, the acoustic intensity, and the acoustic power expressions are obtained analytically. Two different approaches are used to find the acoustic power for some cases, and the results are compared. The intensity and power expressions are the time-averaged ones, and the latter is applicable only to sufficiently low frequency of vibrations. Finally, the dependence of the results on various design parameters, such as frequency of vibration and source geometry, is investigated.