10.2.5.1.2. Piston Sources
The acoustic power radiated from a piston source small compared with the wavelength, i.e., ka ≪ 1, is identical to the power radiated by a simple source having the same source strength Qs, since a small piston acts as a volume source with characteristics independent of the exact source shape. A circular piston source in an infinite, rigid baffle is covered in several textbooks [34–36] and only the most important characteristics of a circular piston source in an infinite rigid baffle of infinite size are given in this section. The standard treatment derives the pressure in the liquid in front of the piston source produced by an infinitesimal area of the piston. The pressure field from the full piston is calculated by ...
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