File:Acoustical emission source location in thin rods through wavelet detail crosscorrelation (IA acousticalemissi00jera).pdf

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Original file ‎(1,208 × 1,641 pixels, file size: 6.78 MB, MIME type: application/pdf, 162 pages)

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Acoustical emission source location in thin rods through wavelet detail crosscorrelation   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
Jerauld, Joseph G.
image of artwork listed in title parameter on this page
Title
Acoustical emission source location in thin rods through wavelet detail crosscorrelation
Publisher
Monterey, California: Naval Postgraduate School;Springfield, Va.: Available from National Technical Information Service
Description
"March 1998."
Thesis advisor(s): Edward M. Wu
Thesis (Degree of Aeronautical and Astronautical Engineer) Naval Postgraduate School, March 1998
Includes bibliographical references (p. 135-136)
Flaws in structural elements release strain energy in the form of stress waves that can be detected through acoustical emission techniques. The transient nature of a stress wave is analytically inconsistent to Fourier Transforms, and the wave characteristics under the effects of dispersion and attenuation deviate from the formal basis of the Windowed Fourier Transform. The transient solid body elastic waves contain multiple wave types and frequency components which lend themselves to the time and frequency characteristics of Wavelet Analysis. Software implementation now enables the exploration of the Wavelet Transform to identify the time of arrival of stress wave signals for source location in homogeneous and composite materials. This investigation quantifies the accuracy and resolution of two existing source location methods and develops a third technique using the Discrete Wavelet Transform on a windowed portion of the stress wave signal. A refined method for the spatial location of material damage induced stress waves can be used to directly monitor the safe life of structures and provide a quantitative measure for the risk assessment of critical and aging structures
Mode of access: World Wide Web
System requirements: Adobe Acrobat reader
US Navy (USN) author
updated dlb 12/12/06

Subjects:
Language en_US
Publication date 1 March 1998
publication_date QS:P577,+1998-03-01T00:00:00Z/11
Current location
IA Collections: navalpostgraduateschoollibrary; fedlink; americana
Accession number
acousticalemissi00jera
Authority file  OCLC: 1038778842
Source
Internet Archive identifier: acousticalemissi00jera
https://archive.org/download/acousticalemissi00jera/acousticalemissi00jera.pdf

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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