Accession Number:

ADA083484

Title:

Transient Acoustic Wave Propagation in an Epstein Duct.

Descriptive Note:

Technical summary rept.,

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF MATHEMATICS

Personal Author(s):

Report Date:

1979-11-01

Pagination or Media Count:

50.0

Abstract:

Transient acoustic wave propagation is analyzed for the case of an unlimited plane-stratified fluid having constant density and sound speed cy at depth y given by the Epstein profile 1cy-squared K sech-squared yH L tanh yH M. The acoustic potential is a solution of the wave equation Dt-squared u - C-squared y D1-squared u D2-squared u Dy-squared u ft,x,y where x x1,x2 are horizontal coordinates and ft,x,y characterizes the wave sources. The principal results of the analysis show that u is the sum of a free component, which behaves like a diverging spherical wave for large t, and a guided component which is approximately localized in a region abs. val. y-y sub 0 or h and propagates outward in horizontal planes like a diverging cylindrical wave. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE