Lagrangean Approach
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Superfícies de pontos dinâmicas / Dynamic point set surfaces
The study of the behaviour of fluids is an ancient field in natural sciences. Recently, engineering phenomena that were empirically studied started to be done with computacional aid. The Computational Fluid Dynamics (CFD) is the area of science that studies computational methods for computer simulation of fluid flow, and often is the most practical way, or t
Publicado em: 2009
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2. Relaxações e método de decomposição para alguns problemas de localização de facilidades modelados em grafos / Relaxations and decomposition approach for some facility location problems modeled by graphs
Despite the great advances in computational equipment and the best known techniques for solving combinatorial optimization problems, it is not always possible to find the optimum solution to some practical facility location problems in a reasonable computational time, due to their size and classification issues. This thesis explores the representation of pro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2008
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3. Relaxações e método de decomposição para alguns problemas de localização de facilidades modelados em grafos / Relaxations and decomposition approach for some facility location problems modeled by graphs
Apesar do grande avanço na área de hardware computacional e das melhores técnicas atuais para a resolução de problemas de otimização combinatória, nem sempre é possível a obtenção do ótimo global para alguns problemas práticos de localização de facilidades em um tempo computacional aceitável devido à classificação como NP-hard e ao porte
Publicado em: 2008
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4. Relaxações e método de decomposição para alguns problemas de localização de facilidades modelados em grafos / Relaxations and decomposition approach for some facility location problems modeled by graphs
Apesar do grande avanço na área de hardware computacional e das melhores técnicas atuais para a resolução de problemas de otimização combinatória, nem sempre é possível a obtenção do ótimo global para alguns problemas práticos de localização de facilidades em um tempo computacional aceitável devido à classificação como NP-hard e ao porte
Publicado em: 2008
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5. Improvement of formulation of identification and solution of the bidimensional impact between structure and rigid wall / Aprimoramento de formulação de identificação e solução do impacto bidimensional entre estrutura e anteparo rígido
This work has as main goal the development of a formulation, based on the finite element method (FEM), for the identification and solution of the bidimensional nonlinear impact between reticulated cyclics structures and fixed rigid wall. The dynamic geometrically nonlinear behavior is treated with a positional formulation classified as total Lagrangean with
Publicado em: 2008
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6. Computational animation of fluid flow using SPH / Animação computacional de escoamento de fluidos utilizando o método SPH
Since the late 70s, there is a growing interest in physically-based simulations due to its increasing range of application. Among these simulations, we may highlight interaction between rigid, elastic, plastic and breakable bodies and also fluids. In this work, one of these phenomena, fluid flow, is simulated using a technique known as Smoothed Particle Hydr
Publicado em: 2008
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7. Investigation of multivariable control techniques for attitude control of a rigid satellite - flexible / Investigação de técnicas de controle multivariáveis no controle de atitude de um satélite rígido - flexível
The main objective of this work is the investigation of multivariable control techniques for attitude control of a Rigid Satellite - Flexible. For this investigation, a satellite model was developed consisting of a rigid body and two flexible panels. The investigated techniques are Linear Quadratic Regulator (LQR) method, Linear Quadratic Gaussian (LQG) meth
Publicado em: 2008
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8. Contribuições à mecânica dos sistemas de massa variável. / Contributions to the mechanics of variable mass systems.
Desde 1814, quando então se deram seus primeiros estudos, a mecânica de sistemas de massa variável tem se constituído como um ramo particular dentro da mecânica clássica. Suas aplicações encontram-se espalhadas por diversas áreas do conhecimento e vão desde a engenharia até a medicina, por exemplo. No entanto, apesar dessas aplicações de sucesso
Publicado em: 2008
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9. Um modelo geometricamente exato de barras com grandes deformações, que considera a distorção e o empenamento geral da seção transversal, e sua discretização pelo método dos elementos finitos. / A fully nonlinear geometrically exact multi-parameter rod model that incorporates general in-plane and out-of-plane cross-sectional changes, and its discretization by Finite Element Method.
The main purpose of this work is to present a fully nonlinear geometrically-exact multi-parameter rod model that incorporates general in-plane cross-sectional changes as well as general out-of-plane cross-sectional warping. The formulation constitutes an extension of the earlier works presented in [1] to [6], [8] and [9], in the sense that the restrictions t
Publicado em: 2008
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10. Optimal dispatch of generating units in hydroelectric systems by heuristic based on langrangean relaxation and dynamic programming / Despacho otimo de unidades geradoras em sistemas hidreletricos via heuristica baseada em relaxação lagrangeana e programação dinamica
The daily scheduling operation of the electrical energy system has by target to find the dispatch generation to the next day which must be compatible with the daily generation target defined by the energy planning models and to be an operational guide. Because of its proximity with the real time operation the modeling must represent the main characteristic o
Publicado em: 2006
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11. AN ALGORITHM WITH COLUMN AND CUT GENERATION FOR THE CAPACITATED VEHICLE ROUTING PROBLEM / UM ALGORITMO DE GERAÇÃO DE COLUNAS E CORTES PARA O PROBLEMA DE ROTEAMENTO DE VEÍCULOS
The Capacitated Vehicle Routing problem (CVRP) has been one of the most studied problems in the field of Combinatorial Optimization. A straight forward generalization of the popular Travelling Salesperson problem, the CVRP has drawn attention of the most prominent researchers since the early 60`s. One of the most important algorithms appeared in the early 80
Publicado em: 2004
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12. Numerical simulation of the wind action on a long-span bridge deck
A numerical model to study the aerodynamic and aeroelastic bridge deck behavior is presented in this paper. The flow around a rigid fixed bridge cross-section, as well as the flow around the same cross-section with torsional motion, are investigated to obtain the aerodynamic coefficients, the Strouhal number and to determine the critical wind speed originati
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12