Abstract
A model equation which describes the propagation of sound beams in a viscous fluid is developed using the oblate spheroidal coordinate system. This spheroidal beam equation (SBE) has a specific application to a theoretical prediction on focused high-frequency beams from a circular aperture. Aperture angle is not limited to be small. Numerical examples are displayed for sound pressure amplitudes of the first few harmonics along and across the beam axis when finite-amplitude sinusoidal waves are radiated in water from the source with uniform amplitude distribution.
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