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Wave Propagation Analysis and Invers...

Lloyd, Stephen F.

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Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions./
Author:	Lloyd, Stephen F.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	132 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10274004
ISBN:	9781369824384

Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions.
Lloyd, Stephen F.

Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 132 p.

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--The Catholic University of America, 2017.

The purpose of this research is to test the effectiveness of forward and inverse modeling approaches in wave propagation analysis problems with complex settings and scenarios that include fluid-solid interfaces, non-stationary sources, and non-point sources not previously investigated. The research is made up of three components. First, finite element method modeling and a genetic algorithm are employed to assess the feasibility of using inverse modeling to determine the thickness of the surface ice on Europa, one of Jupiter's moons, and the depth of a possible subsurface ocean. The feasibility study presented in this dissertation considers the specific case in which inverse modeling might be used to determine the depths of ice and ocean layers on Europa for a possible space mission in which the effects of a spacecraft-released impactor on Europa's surface are measured. Second, reconstructing dynamic distributed loads, such as truck loads on highways, require inverting for large numbers of parameters. To address solving for the large number of unknowns in such problems, an adjoint-method-based acoustic-source inversion procedure for reconstructing multiple moving, non-point acoustic sources is developed and tested with numerical experiments. Third, forward modeling of moving sources in three-dimensional (3D) settings is tested with numerical experiments using SPECFEM3D, an open source spectral element method program. Researching forward modeling for complicated scenarios such as moving acoustic sources in fluid-solid coupled systems in 3D is an important step toward using SPECFEM3D for moving-source inversion problems in 3D.

ISBN: 9781369824384Subjects--Topical Terms:

860360
Civil engineering.

Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions.
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245 1 0 $a Wave Propagation Analysis and Inverse Modeling to Identify Fluid-Solid Interfaces and Moving-Source Functions.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 132 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Adviser: Chanseok Jeong.
502 $a Thesis (Ph.D.)--The Catholic University of America, 2017.
520 $a The purpose of this research is to test the effectiveness of forward and inverse modeling approaches in wave propagation analysis problems with complex settings and scenarios that include fluid-solid interfaces, non-stationary sources, and non-point sources not previously investigated. The research is made up of three components. First, finite element method modeling and a genetic algorithm are employed to assess the feasibility of using inverse modeling to determine the thickness of the surface ice on Europa, one of Jupiter's moons, and the depth of a possible subsurface ocean. The feasibility study presented in this dissertation considers the specific case in which inverse modeling might be used to determine the depths of ice and ocean layers on Europa for a possible space mission in which the effects of a spacecraft-released impactor on Europa's surface are measured. Second, reconstructing dynamic distributed loads, such as truck loads on highways, require inverting for large numbers of parameters. To address solving for the large number of unknowns in such problems, an adjoint-method-based acoustic-source inversion procedure for reconstructing multiple moving, non-point acoustic sources is developed and tested with numerical experiments. Third, forward modeling of moving sources in three-dimensional (3D) settings is tested with numerical experiments using SPECFEM3D, an open source spectral element method program. Researching forward modeling for complicated scenarios such as moving acoustic sources in fluid-solid coupled systems in 3D is an important step toward using SPECFEM3D for moving-source inversion problems in 3D.
520 $a The conclusions of the research presented are as follows: It is feasible to estimate the thickness of the ice layer on the surface of Europa and the depth of a subsurface ocean with inverse modeling based on measured wave motions in the ice caused by a planned impact. The adjoint method is effective in reconstructing large numbers of acoustic source parameters in one-dimensional acoustic source inversion problems in which the acoustic sources are moving distributed loads. The adjoint-method-based acoustic source inversion approach tested is more effective than using genetic algorithms in acoustic source inversion problems with large numbers of parameters. Moving sources in complex 3D settings can be modeled effectively using SPECFEM3D.
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650 4 $a Acoustics. $3 879105
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773 0 $t Dissertation Abstracts International $g 78-10B(E).
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