NEAR-FIELD CHARACTERISTICS OF CIRCULAR PISTON RADIATORS WITH SIMPLE SUPPORT

A closed-form expression for the pressure field produced by a circular piston radiator with simply supported boundary condition and continuo us-wave excitation is derived. The method of Hasegawa et al. [J. Acous t. Soc. Am. 74, 1044-1047 (1983)], developed for a uniformly vibrating piston, is extended to include the nonuniform case. The resulting exp ression is valid for all field points and for large ratio of source di ameter to wavelength. The average pressure on the surface of a circula r receiver as a function of receiver size and distance from the transd ucer is also calculated.