Unbounded Domains
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. New methodologies for the calculation of Green's functions for wave problems in two-dimensional unbounded domains
Este trabalho descreve a aplicação de novas metodologias para o cálculo das transformadas de Fourier inversas que fornecem as funções de Green associadas às equações da onda e de Helmholtz em todo o domínio bidimensional.
TEMA (São Carlos). Publicado em: 2013-04
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2. Transient wave propagation phenomena at visco-elastic half-spaces under distributed surface loadings
This article analyzes the transient wave propagation phenomena that take place at 2D viscoelastic half-spaces subjected to spatially distributed surface loadings and to distinct temporal excitations. It starts with a fairly detailed review of the existing strategies to describe transient analysis for elastic and viscoelastic continua by means of the Boundary
Lat. Am. j. solids struct.. Publicado em: 2012-08
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3. THE HYBRID BOUNDARY ELEMENT METHOD BASED ON GENERALIZED WESTERGAARD STRESS FUNCTIONS / O MÉTODO HÍBRIDO DOS ELEMENTOS DE CONTORNO COM BASE EM FUNÇÕES DE TENSÃO DE WESTERGAARD GENERALIZADAS
A particular implementation of the hybrid boundary element method is presented for the two dimensional analysis of potential and elasticity problems, which although general in concept, is suited for fracture mechanics applications. Generalized Westergaard stress functions, as proposed by Tada et al in 1993, are used as the problem¿s fundamental solutions. T
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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4. Problemas elípticos semilineares com potenciais ilimitados e/ou com decaimento radial / Elliptics semilineares problems with unbounded potential and/or with radial potential
Neste trabalho, estudamos duas classes de problemas elípticos modeladas em domínios ilimitados. O estudo dessas classes de problemas e relevante não só no campo da matemática aplicada, mas também na área de análise não linear. Nesses problemas, como o domínio é ilimitado, há a perda de compacidade da “imersão" de Sobolev, dificultando a co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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5. Existência de múltiplas soluções para classes de problemas elípticos com função peso mudando de sinal em domínios ilimitados
The aim of this work is to give some suficient conditions for the existence and multiplicity of the solutions for a class of elliptic problems with sign-changing weight function in unbounded domains, using for this variational techniques. Specifically, in the semilinear case we use the minimization arguments on the Nehari manifold. For the quasilinear case,
Publicado em: 2009
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6. Synthesis of viscoelastodynamic Green functions and auxiliary states for three-dimensional unbounded domains with aid of the Radon transform / Sintese de funções de Green e estados auxiliares viscoelastodinamicos em meios tridimensionais ilimitados com auxilio da transformada de Radon
O objetivo deste trabalho foi desenvolver uma formulação para obtenção de Funções de Green e estados auxiliares para os problemas viscoelastodinâmicos tridimensionais. Os problemas são descritos com auxílio de equações diferenciais, as quais foram solucionadas utilizando as transformadas de Radon e Fourier, bem como condições de contorno especí
Publicado em: 2006
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7. Numerical methods for the dynamics of unbounded domains
The present article discusses the relation between boundary conditions and the Sommerfeld radiation condition underlying the dynamics of unbounded domains. It is shown that the classical Dirichlet, Neumann and mixed boundary conditions do not fulfill the radiation condition. In the sequence, three strategies to incorporate the radiation condition in numerica
Computational & Applied Mathematics. Publicado em: 2005-04
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8. Soluções transientes de problemas visco-elastodinamicos em meios ilimitados atraves da transformada de Fourier rapida - FFT
This dissertation describes a methodology based on the Fast Fourier Transfonn - FFT to synthesize transient Green and Influence functions for unbounded viscoelastic domains. The FFT algorithm is applied to Green or Influence functions that has been previously obtained in the frequency domain. The techniques used to treat the functions in the frequency domain
Publicado em: 2002
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9. Elementos infinitos para tratamento de problemas da viscoelastodinamica estacionaria pelo metodo dos elementos finitos
The present thesis reports an overview and a numerical implementation of the Finite Element Method (FEM) in wich the so called "infinite elements" are included to model the Sommerfeld s radiation condition or the geometric damping in the stationary response of unbounded (visco-) elastic domains. Initially one dimensional infinite elements are formulated and
Publicado em: 1996
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10. Um problema do tipo ambrosetti-prodi para um sistema de equações elipticas
In Chapter 1 we consider the following system of semilinear elliptic equations: LU = F(x, U) + T? + H(x), U = 0, where l = diag (L, L), T E 2, L is a 2nd order elliptic operator in the divergent form, H is a fixed vector-function in C?(?) x C?(?) and
Publicado em: 1994
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11. Pseudo-monotone operators and nonlinear elliptic boundary value problems on unbounded domains
A general boundary value problem of variational type is considered for a general quasi-linear elliptic partial differential operator of order 2m in generalized divergence form. Such problems are considered on an arbitrary domain in a Euclidean space without hypotheses of boundedness on the domain or smoothness on its boundary. Contrary to the prevailing doct