Wednesday, April 23, 1986 4:00 p.m.
Applied Research Laboratories
The University of Texas at Austin
Since it is relatively easy to integrate gaussian functions, it is tempting in certain cases to model complex sound sources as a superposition of gaussian functions. One such case is in the calculation of the parametric radiation associated with a noise source with a high-frequency pump mounted on it.
During the past summer Drs. Hamilton, Naze Tjøtta, and Tjøtta solved this case analytically for the paraxial region of a gaussian source with a gaussian pump. Their solution may be used to find the parametric radiation for more complicated sound sources (e.g., a piston) by modeling the source as a superposition of gaussian functions. The parametric radiation associated with each is calculated separately and superposed.
In this seminar four gaussian superposition models for a piston are compared by examining their near and farfield beam patterns. Preliminary results of the parametric radiation beam pattern are also given.