Boundary Integral Method
Mostrando 13-24 de 55 artigos, teses e dissertações.
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13. Fast Multipole Burton-Miller Boundary Element Method for Two and Three-Dimensional Acoustic Scattering
Abstract: A multistage adaptive fast multipole method is used to accelerate the matrix-vector products arising from the Burton-Miller boundary integral equations, which are formed in a boundary element method. The present study considers the scattering of acoustic waves, generated by localized sources from bodies with rigid surfaces. Details on the implement
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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14. A transformation of variables technique applicable to the boundary element method to simulate a special class of diffusive-advective potential problems
This paper describes a novel Boundary Element Technique developed for application to one-dimensional and a class of two-dimensional diffusive-advective potential problems. It is based on transformation of variable procedure to establish an integral equation inverse sentence, dealing only with boundary variables, using a fundamental solution associated with a
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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15. Solução da equação Sn multigrupo de transporte dependente do tempo em meio heterogêneo
In this dissertation is presented an analytical solution for the approximation SN transport equation with the time dependent power, to homogeneous plates as to heterogeneous, assuming a multigroup model with isotropic scattering. The main idea involves the following steps, in this order: construction of a solution to the equation mentioned in a homogeneous p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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16. Solução analítica da aproximação Sn da equação de transporte para problemas de valor inicial e de contorno pela transformada dupla de Laplace / Analytical solution of approach SN of the equation of transport for problems of initial value and contour for the laplace double transformed
In this work a general analytical solution is reported, expressed in integral form for the time-dependent, one-dimensional SN transport equation in cartesian geometry valid for bounded and unbounded domain (0
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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17. A semi-analytical computation of the Kelvin kernel for potential flows with a free surface
A semi-analytical computation of the three dimensional Green function for seakeeping flow problems is proposed. A potential flow model is assumed with an harmonic dependence on time and a linearized free surface boundary condition. The multiplicative Green function is expressed as the product of a time part and a spatial one. The spatial part is known as the
Computational & Applied Mathematics. Publicado em: 2011
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18. Flexural motions under accelerating loads of structurally prestressed beams with general boundary conditions
The transverse vibration of a prismatic Rayleigh beam resting on elastic foundation and continuously acted upon by concentrated masses moving with arbitrarily prescribed velocity is studied. A procedure involving generalized finite integral transform, the use of the expression of the Dirac delta function in series form, a modification of the Struble's asympt
Latin American Journal of Solids and Structures. Publicado em: 2010-09
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19. Excavation analysis of tunnels with lining using the boundary element method / Análise de escavações de túneis com revestimento utilizando o método dos elementos de contorno
In this work, an isoparametric boundary element method (BEM) formulation with approximation of any order was developed to the analysis of stiffened two-based on local stiffness corrections, which are made using an additional integral written in terms of initial stresses, applied over the areas close to stiffeners. Besides the usual displacement integral equa
Publicado em: 2010
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20. Modelagem de problemas da mecanica da fratura e propagação de trincas em fadiga / Modelling problems of fracture mechanics and fatigue crack propagation
Este trabalho apresenta uma ferramenta para modelar a propagação de múltiplas trincas por fadiga em modo misto para materiais isotrópicos, utilizando o Método dos Elementos de Contorno Dual. Este método é utilizado para realizar uma análise de tensões e deformações no sólido, de modo a proporcionar resultados confiáveis para o campo elástico na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2009
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21. Comparação de desempenho entre as formulações singular e ipersingular do método dos elementos de contorno
In this work, the Singular and Hypersingular Formulations of the Boundary Element Method are presented and their results are compared on two dimensional stationary scalar field problems , governed by the Laplace Equation. In the conventional formulations of the Boundary Element Method, a special attention must be given to the singular integrations that appea
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/05/2009
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22. Evaluation of non-singular BEM algorithms for potential problems
Two non-singular boundary element method (BEM) algorithms for two-dimensional potential problems have been implemented using isoparametric quadratic, cubic and quartic elements. The first one is based on the self-regular potential boundary integral equation (BIE) and the second on the self-regular flux-BIE. The flux-BIE requires the C1,α continuity of the d
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-09
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23. Formulação dual em mecânica da fratura utilizando elementos de contorno curvos de ordem qualquer / Dual boundary element formulation in fracture mechanics using curved element of any order
This work presents the dual boundary element formulation applied to linear crack problem. The goal of this research is the evaluation of stress intensity factor for two-dimensional crack problem using three different techniques, which are: the technique of correlation of displacements, the technique based on the state of tension at the crack tip and J integr
Publicado em: 2009
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24. Analysis of stress in thin plates of composite materials under dynamic load using the boundary element method / Analise de tensões em placas finas de materiais compositos sob carregamento dinamico usando o metodo dos elementos de contorno
This work presents a dynamic formulation of the boundary element method for stress and failure criterion analyses of anisotropic thin plates. Formulations use elastostatic fundamental solutions and inertia terms are treated as body forces. Domain integrals that come from body forces are transformed into boundary integrals using the radial integration method
Publicado em: 2009