Título: | GEOMETRIC MODELIG FOR FINITE ELEMENTS WITH MULTI-REGIONS AND PARAMETRIC SURFACES | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Autor: |
WILLIAM WAGNER MATOS LIRA |
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Colaborador(es): |
LUIZ FERNANDO CAMPOS RAMOS MARTHA - Orientador |
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Catalogação: | 11/JUL/2002 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=2755&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=2755&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.2755 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||||||||||||||
This work presents a computational environment for
geometric modeling applied to
finite-element analysis using multi-regions and parametric
surfaces represented as
NURBS. The main goal is to generate 3D models to be used in
numerical simulations
based on the Finite-Element Method (FEM). For this purpose,
the adopted methodology
consists of combining some aspects of geometric modeling,
such as automatic region
detection and surface intersection, with finite-element
mesh generation.
In the context of Object-Oriented Programming, a new class
organization for the
geometric modeler used in this work, called MG (Mesh
Generation), is presented. This
class organization allows the implementation of the
proposed environment, keeping the
user interface as simple and efficient as in the original
version of the MG modeler.
The proposed class organization also provides support for
the generation of models used
in finite-element analysis. While the finite-element meshes
required for the numerical
simulations are generated by specific algorithms
implemented in MG, the attributes are
managed by a system called ESAM (Extensible System
Attributes Management), which
also is incorporated into MG. This system allows the
customization of simulation
attributes in the MG modeler for use in different types of
Engineering problems.
The data structure used in this environment is represented
by a hybrid approach based
on the combination of a CGC (Complete Geometric Complex)
representation and the
MG`s data structure, which has been extended for this
purpose. Moreover, the
computation of surface intersections is accomplished by
using an algorithm
implemented in the MG, while the CGC representation is
responsible for multi-region
recognition. The surface-intersection algorithm has been
modified in order to handle
special cases that have not been treated in the original
version.
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