Guided Wave Technique to Detect Defects in Pipes Using Wavelet Analysis

Persistent Link:
http://hdl.handle.net/10150/194837
Title:
Guided Wave Technique to Detect Defects in Pipes Using Wavelet Analysis
Author:
Ahmad, Rais
Issue Date:
2005
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The purpose of this research work is to find an apposite non-destructive technique to identify defects in soil embedded pipes using Cylindrical Guided Waves. These waves can propagate a long distance through the walls of cylindrical pipes as guided waves and are sensitive to defects along their path of propagation. The traditional ultrasonic methods are good for detecting relatively large voids or defects (compared to signal wave lengths) but are not very efficient in detecting small defects. Cylindrical guided waves are sensitive to small defects.In transmission pipelines, most of the pipes are buried in soil or have protective surface coatings. In addition, flow through the pipes has to be stopped while using conventional non-destructive testing. One of the foremost objectives of this research work is to find an appropriate guided wave technique to detect defects without hampering the flow through the pipes. This research investigates how the propagation of leaky cylindrical guided waves are affected by the presence of surrounding soil when the pipes are embedded in the soil.In this research work, Continuous Wavelet Transform and Gabor Transforms are used along with Fast Fourier transforms as signal processing tools to analyze the signals and to detect and locate defects in pipes. This investigative research shows that the guided wave inspection technique in combination with wavelet analysis is an efficient and effective tool for health monitoring of underground pipelines.
Type:
text; Electronic Dissertation
Degree Name:
PhD
Degree Level:
doctoral
Degree Program:
Engineering Mechanics; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Kundu, Tribikram
Committee Chair:
Kundu, Tribikram

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleGuided Wave Technique to Detect Defects in Pipes Using Wavelet Analysisen_US
dc.creatorAhmad, Raisen_US
dc.contributor.authorAhmad, Raisen_US
dc.date.issued2005en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe purpose of this research work is to find an apposite non-destructive technique to identify defects in soil embedded pipes using Cylindrical Guided Waves. These waves can propagate a long distance through the walls of cylindrical pipes as guided waves and are sensitive to defects along their path of propagation. The traditional ultrasonic methods are good for detecting relatively large voids or defects (compared to signal wave lengths) but are not very efficient in detecting small defects. Cylindrical guided waves are sensitive to small defects.In transmission pipelines, most of the pipes are buried in soil or have protective surface coatings. In addition, flow through the pipes has to be stopped while using conventional non-destructive testing. One of the foremost objectives of this research work is to find an appropriate guided wave technique to detect defects without hampering the flow through the pipes. This research investigates how the propagation of leaky cylindrical guided waves are affected by the presence of surrounding soil when the pipes are embedded in the soil.In this research work, Continuous Wavelet Transform and Gabor Transforms are used along with Fast Fourier transforms as signal processing tools to analyze the signals and to detect and locate defects in pipes. This investigative research shows that the guided wave inspection technique in combination with wavelet analysis is an efficient and effective tool for health monitoring of underground pipelines.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineEngineering Mechanicsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorKundu, Tribikramen_US
dc.contributor.chairKundu, Tribikramen_US
dc.contributor.committeememberChen, Weinong (Wayne)en_US
dc.contributor.committeememberMerry, Scott M.en_US
dc.contributor.committeememberHaldar, Achintyaen_US
dc.identifier.proquest1114en_US
dc.identifier.oclc137354038en_US
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