Publication:
Recursive ray acoustics for three-dimensional sound-speed profiles

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Authors
Polnicky, F. Wynn
Subjects
Ray acoustics
Sound-speed profile
Spatial Fourier series
Advisors
Ziomek, Lawrence J.
Date of Issue
1991-09
Date
September 1991
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A comparison of a simple recursive ray acoustics algorithm versus a ray acoustics algorithms based on solving a system of first-order ordinary differential equations was conducted. the recursive ray acoustics (RRA) was found to be accurate and relatively fast. The RRA algorithm is capable of handling sound speed as a function of all three spatial coordinates, and this capability was demonstrated. Two separate methods of representing a sound-speed profile (SSP) based on data points were examined: Akima cubic spline and spatial Fourier series (SFS). The SFS representation encountered difficulties in accurately modeling SSPs. Various techniques were applied to improve the SFS sound-speed representation. While accurate sound-speed fits eventually achieved, difficulties remained in the SFS modeling of first and second-order derivatives of the sound-speed data. The RRA algorithm was tested using the SFS sound-speed representation and found to be significantly inaccurate. A demonstration was conducted of the ability of the SFS sound-speed representation to incorporate randomness in the SSP.
Type
Thesis
Description
Series/Report No
Department
Anti-Submarine Warfare Academic Group
Engineering Acoustics Academic Committee
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
101 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner
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