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Higher-order parabolic approximations for sound propagation in stratified moving mediaAsymptotic solutions of order k-n are developed for the equations governing the propagation of sound through a stratified moving medium. Here k is a dimensionless wave number and n is the arbitrary order of the approximation. These approximations are an extension of geometric acoustics theory and provide corrections to that theory in the form of multiplicative functions which satisfy parabolic partial differential equations. These corrections account for the diffraction effects caused by variation of the field normal to the ray path and the interaction of these transverse variations with the variation of the field along the ray. The theory is illustrated by application to simple examples.
Document ID
19850028741
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcaninch, G. L.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 84-2356
Accession Number
85A10892
Distribution Limits
Public
Copyright
Other

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