Recursive ray acoustics for three-dimensional sound-speed profiles
Loading...
Authors
Polnicky, F. Wynn
Subjects
Ray acoustics
Sound-speed profile
Spatial Fourier series
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
Engineering Acoustics Academic Committee
Organization
Naval Postgraduate School (U.S.)
Antisubmarine Warfare Academic Group (ASWAG)
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