Nonlinear Control Theory
Mostrando 25-36 de 45 artigos, teses e dissertações.
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25. Predictive model for the cold rolling process through sensitivity factors via neural networks
The mathematical modeling of the rolling process involves several parameters that may lead to non-linear equations of difficult analytical solution. Such is the case of Alexander's model (Alexander 1972), considered one of the most complete in the rolling theory. This model requires excessive computational time, which prevents its application in on-line cont
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03
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26. Uso de controle geométrico em sincronização aplicado à estimação de parâmetro de sistemas dinâmicos / Use of geometric control in synchronization applied to parameter estimation of dynamical systems
This work proposes a parameter estimation method for nonlinear dynamical systems based on nonlinear control techniques and synchronization. The central idea of the method is to synchronize the model with the system, and, in parallel, to estimate the systems parameters. Synchronization is achieved by the use of nonlinear geometric control techniques, and the
Publicado em: 2006
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27. Monte Carlo methods in nonlinear filtering theory.
This thesis is focused on two basic aspects of the Control Problem: the stochastic modelling of physical systems, and Monte Carlo-based numerical approximation of the nonlinear filtering problem solution. In the first topic this thesis concerns about clarifying some issues in the mathematical modeling of continuous-time systems with Brownian motion. The hypo
Publicado em: 2006
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28. Uso de controle geométrico em sincronização aplicado à estimação de parâmetro de sistemas dinâmicos / Use of geometric control in synchronization applied to parameter estimation of dynamical systems
Este trabalho trata da proposição de um método de estimação de parâmetros para sistemas dinâmicos não lineares baseado no uso de técnicas de controle não linear e sincronização. A idéia principal do método é sincronizar o modelo com o sistema e, concomitantemente, estimar os parâmetros do sistema. A sincronização é obtida através de técn
Publicado em: 2006
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29. Fuzzy pole placement based on piecewise Lyapunov functions / Controle fuzzy via alocação de pólos com funções de Lyapunov por partes
This work presents a controller design method for fuzzy dynamic systems based on piecewise Lyapunov functions with constraints on the closed-loop pole location. The main idea is to use switched controllers to locate the poles of the system to obtain a satisfactory transient response. The pole placement strategy allows to specify the performance in terms of t
Publicado em: 2006
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30. Desenvolvimento de um atuador de posição baseado em liga de memória de forma com resfriamento forçado. / Development of a position actuator based on a shape memory alloy with forced cooling.
Shape Memory Alloys (SMA) consist of a group of metallic materials that demonstrate the ability to return to some previously defined shape when subjected to the appropriate thermal cycle, due to shift in the materials crystalline structure. The change that occurs within SMAs crystalline structure is not a thermodynamically reversible process and results in h
Publicado em: 2006
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31. Desenvolvimento de um sistema de imageamento usando a tomografia por coerÃncia Ãptica no domÃnio temporal e de Fourier
In this dissertation, we describe the basic theory and details of the implementation of three experimental optical coherence tomography systems, two in the time domain and one in the spectral (Fourier) domain. Optical coherence tomography (OCT) is a non invasive optical imaging method, capable of producing cross-sectional images of materials and biological t
Publicado em: 2006
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32. Sobre caos homoclinico : aplicações a ciencia da engenharia e mecanica / Homoclinic chaos : applications to the science of engineering and mechanics
Este trabalho tem como objetivo a determinação analítica da ocorrência de um tipo de caos (irregularidade) determinístico denominado Caos Homoclínico em algumas aplicações da Ciência da Engenharia como, por exemplo, a Robótica e a Teoria de Controle (Controle de Bifurcações e Caótico). Para isto, faz-se uso da chamada Teoria de Poincaré - Mel?n
Publicado em: 2005
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33. Modeling of a vehicle suspension with non linear elements and performance comparison to a semi-active model / Modelagem de uma suspensão veicular com elementos não lineares e comparação de seu desempenho com um modelo semi-ativo
This work describes the analysis and comparison of a vehicle suspension semi-active controlled to a non linear passive system. The mathematic model of a suspension system, detailed in this work, has seven degrees of freedom in order to represent a full vehicle system. The two semi-active control laws used in this work are based on the skyhook theory. In the
Publicado em: 2005
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34. Nonlinear H INFINITO control of underactuated robot manipulators / Controle H INFINITO não linear de robôs manipuladores subatuados
This work presents the development, implementation and analysis of nonlinear H control techniques applied to underactuated manipulators, under parametric uncertainties and external disturbances. At the first part, two approaches are considered for underactuated individual manipulators. The first approach consists in representing manipulators as nonlinear
Publicado em: 2004
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35. Modelagem e analise de digestores Kraft descontinuo
Global1y, the Kraft pulping process is beginning to get use of the benefits of the recent developments in the modeling area and process control. Advanced techniques of simulation and control offer tools that allow the analysis and efficient design of multivariable non-linear process, involving the optimization and the advanced control of the process. The pul
Publicado em: 2004
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36. Analise do processo de extrusão na industria de "PET-FOOD" para a aplicação de tecnicas de controle avançado / Review of the extrusion industry in the "PET-FOOD" for the application of advanced techniques of control
The present study informs about the main features of extrusion control processes, based on product-wet density and moisture. To comprehend the study, some background of the classic control theory is provided. The process complexity, provided by formation of a bio-polymer from carbohydrate-lipid-protein raw materials, requires analysis using statistical conce
Publicado em: 2003