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Applications of the boundary element...

Kim, Jaekwan.

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Applications of the boundary element method to elastic wave scattering problems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Applications of the boundary element method to elastic wave scattering problems./
Author:	Kim, Jaekwan.
Description:	191 p.
Notes:	Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 3973.
Contained By:	Dissertation Abstracts International51-08B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9031801

Applications of the boundary element method to elastic wave scattering problems.
Kim, Jaekwan.

Applications of the boundary element method to elastic wave scattering problems. - 191 p.

Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 3973.

Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 1990.

In order to study wave scattering phenomena by obstacles imbedded in an elastic half space, 2-dimensional (2-D in short) and 3-dimensional (3-D in short) boundary element formulations and computer algorithms are developed based on the fundamental solutions of the reduced elastodynamic state (steady state).Subjects--Topical Terms:

1018410
Applied Mechanics.

Applications of the boundary element method to elastic wave scattering problems.
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005 20080107105522.5
008 130610s1990 eng d
035 $a (UMI)AAI9031801
035 $a AAI9031801
040 $a UMI $c UMI
100 1 $a Kim, Jaekwan. $3 1924433
245 1 0 $a Applications of the boundary element method to elastic wave scattering problems.
300 $a 191 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-08, Section: B, page: 3973.
500 $a Adviser: Apostolos Papageorgiou.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 1990.
520 $a In order to study wave scattering phenomena by obstacles imbedded in an elastic half space, 2-dimensional (2-D in short) and 3-dimensional (3-D in short) boundary element formulations and computer algorithms are developed based on the fundamental solutions of the reduced elastodynamic state (steady state).
520 $a Since out-of-plane motion (SH wave case) can be uncoupled from the in-plane motion (P-SV wave case) in a 2-D model (plane strain), these two cases are treated separately.
520 $a An algorithm for axisymmetric 3-D objects is developed to reduce computation time significantly.
520 $a The complex frequency method, which is introduced to evaluate the improper integral, is briefly described and its connection with Laplace transform is discussed. To include attenuation which exists in most elastic media, hysteretic damping is introduced by making the elastic modulus complex.
520 $a The response of the Caracas Valley (Caracas, Venezuela), to incident plane waves is studied using the 2-D formulations in an attempt to explain the very localized destruction pattern observed during the 1967 earthquake. To see the difference between a 2-D model and a simpler, horizontally layered model (1-D), a 1-D analysis is performed using the propagator matrix method. The effects of soft surface layer, material damping and incidence angle are examined. These results show that strong horizontal interference and concentration of seismic energy can be generated by the irregular interface of the sediments with the basement rock. It is concluded that the resonance frequency band of the sediments happened to coincide with the fundamental frequency band of the damaged buildings in the area of heavy destruction.
520 $a Wave scattering problems by a spherical cavity and rigid sphere imbedded in an infinite elastic space are examined using the full space formulation. Comparison with existing analytical solutions shows excellent agreement. Using the half space formulation, a wave scattering problem by a hemispherical canyon is studied. Comparison with existing numerical solutions confirmed the applicability and accuracy of our 3-D formulation.
520 $a To the extent possible, computer codes developed are written in vectorized FORTRAN. (Abstract shortened with permission of author.)
590 $a School code: 0185.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Geophysics. $3 535228
650 4 $a Engineering, Civil. $3 783781
690 $a 0346
690 $a 0373
690 $a 0543
710 2 $a Rensselaer Polytechnic Institute. $3 1019062
773 0 $t Dissertation Abstracts International $g 51-08B.
790 1 0 $a Papageorgiou, Apostolos, $e advisor
790 $a 0185
791 $a Ph.D.
792 $a 1990
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9031801