Accession Number:

ADA164514

Title:

Application and Extension of an Analytical Model of the Confined Acoustic Beam Generated by a Transducer.

Descriptive Note:

Final rept.,

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1985-10-01

Pagination or Media Count:

251.0

Abstract:

Numerous evaluations of the acoustic field radiating from a baffled transducer have appeared in the published literature. An important feature is that these theories are applicable for a wide range of parameters. Approximations, such as those describing an axisymmetric sound beam in the far field Fraunhofer zone can substantially reduce computational cost, but they are not necessary. Linear theory is valid when the source level is sufficiently low. Even then, diffraction effects in the near field, which lead to localized cancellations and reinforcements, complicate the task of correlating near field measurements to far field propagation properties. The primary goal of this project was to develop an analytical description of transducer radiation in which finite amplitude effects, diffraction, and spherical spreading are treated consistently, without limitation to a specific spatial domain. The technique employed singular perturbation theory in conjunction with asymptotic analysis.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE