The propagation of a scattered acoustic boundary wave over a rough wedge.
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Authors
Hollis, Stephen Joe
Subjects
acoustic energy diffraction
acoustic energy scattering
boundary wave
acoustic energy scattering
boundary wave
Advisors
Medwin, H.
Date of Issue
1980-12
Date
December 1980
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The theory for the generation of a scattered acoustic
boundary wave over a slightly rough planar surface has been
developed by I. Tolstoy [J. Acoust. Soc. Am., _66_ 1135-1144
(1979)] and experimentally verified by Medwin et al., [J.
Acoust. Soc. Am., 6_6 1131-1134 (1979)]. In the present experiment
the propagation of the boundary wave over a wedge is
studied. It is found that the boundary wave and the geometrically
spreading volume wave diffract from the crest in
the same manner. The amplitude ratio of the boundary wave
to the diffracted volume wave, where the growth of the boundary
wave from the crest is due to a phased line source at the
crest caused by the diffracting volume wave, was found to have an average frequency dependence, f², and an average range
dependence, R⁺⁰˙⁵. The amplitude ratio of boundary wave to
diffracted volume wave due to propagation over the rough wedge
gave an average frequency dependence of f² and an average range dependence of R⁰˙³. Low wave number grazing propagation
over a wedge produces a boundary wave whose amplitude can be
many times that of a diffracted volume wave for a smooth
surfaced wedge.
Type
Thesis
Description
Series/Report No
Department
Physics and Chemistry
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.