Ultrasonic Wave Propagation on an Inclined Solid Half-Space Partially Immersed in a Liquid

Persistent Link:
http://hdl.handle.net/10150/195600
Title:
Ultrasonic Wave Propagation on an Inclined Solid Half-Space Partially Immersed in a Liquid
Author:
Dao, Cac Minh
Issue Date:
2007
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 interaction between a bounded ultrasonic beam and a liquid wedge over a solid half-space is studied theoretically as well as experimentally. A semi-analytical technique called Distributed Point Source Method (DPSM) is adopted for modeling the ultrasonic field in a wedge-shaped fluid structure on a solid half-space. This study is important for analyzing and understanding the propagation of ultrasonic waves used for underwater communications and inspections. A better understanding of the elastic wave propagation in water and in submerged marine strata near the seashore requires extensive investigations of such problem geometries. The semi-analytical technique used in this dissertation considers a bounded acoustic beam striking a fluid-solid interface between a fluid wedge and a solid half-space. Solution of this problem is beyond the scope of the currently available analytical methods when the beam is bounded. However, it is important to model the bounded beams because, in all underwater communications and inspections, bounded beams are used. Currently, only numerical method [Boundary Element Method (BEM) or Finite Element Method (FEM)] based packages (e.g., PZFlex) are in principle capable of modeling ultrasonic fields in such structures. However, these packages are not very accurate and are very CPU-intensive for high-frequency ultrasonic problems. At high frequencies, FEM- and BEM-based packages require huge amount of computation memory and time for their executions that the DPSM technique can avoid. The effect of the angle variation between the fluid-solid interface and the fluid wedge on the wave propagation characteristics is studied and presented.
Type:
text; Electronic Dissertation
Keywords:
Wave Propagation; DPSM; Elastic; Ultrasonic
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.titleUltrasonic Wave Propagation on an Inclined Solid Half-Space Partially Immersed in a Liquiden_US
dc.creatorDao, Cac Minhen_US
dc.contributor.authorDao, Cac Minhen_US
dc.date.issued2007en_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 interaction between a bounded ultrasonic beam and a liquid wedge over a solid half-space is studied theoretically as well as experimentally. A semi-analytical technique called Distributed Point Source Method (DPSM) is adopted for modeling the ultrasonic field in a wedge-shaped fluid structure on a solid half-space. This study is important for analyzing and understanding the propagation of ultrasonic waves used for underwater communications and inspections. A better understanding of the elastic wave propagation in water and in submerged marine strata near the seashore requires extensive investigations of such problem geometries. The semi-analytical technique used in this dissertation considers a bounded acoustic beam striking a fluid-solid interface between a fluid wedge and a solid half-space. Solution of this problem is beyond the scope of the currently available analytical methods when the beam is bounded. However, it is important to model the bounded beams because, in all underwater communications and inspections, bounded beams are used. Currently, only numerical method [Boundary Element Method (BEM) or Finite Element Method (FEM)] based packages (e.g., PZFlex) are in principle capable of modeling ultrasonic fields in such structures. However, these packages are not very accurate and are very CPU-intensive for high-frequency ultrasonic problems. At high frequencies, FEM- and BEM-based packages require huge amount of computation memory and time for their executions that the DPSM technique can avoid. The effect of the angle variation between the fluid-solid interface and the fluid wedge on the wave propagation characteristics is studied and presented.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectWave Propagationen_US
dc.subjectDPSMen_US
dc.subjectElasticen_US
dc.subjectUltrasonicen_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.committeememberContractor, Dinshawen_US
dc.contributor.committeememberFrantziskonis, Georgeen_US
dc.contributor.committeememberDesai, Chandrakanten_US
dc.contributor.committeememberHaldar, Achintyaen_US
dc.identifier.proquest2304en_US
dc.identifier.oclc659748156en_US
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