Abstract
A circular piston with diameter selectable as 25, 50, or 76 mm (with values of ka of about 25, 50, and 75) was used to radiate 470‐kHz sound in a fresh water lake. Source levels ranged from 195–230 dB re: 1 μPa at 1 m. Beam patterns and axial sound pressure levels at about 7 and 11 m were recorded for the fundamental through fourth harmonic frequencies. The data were used to draw amplitude response curves and curves of beamwidth versus source level. Predictions based on two models of finite amplitude sound radiated by a piston, the equivalent spherical source model [J. A. Shooter, T. G. Muir, and D. T. Blackstock, J. Acoust. Soc. Am. 55, 54–62 (1974)], and the quasilinear approximation model [J. N. Tjøtta and S. Tjøtta, J. Acoust. Soc. Am. 67, 484–490 (1980)], agree well with the data. [Work supported by Office of Naval Research.]
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
