Piecewise Linear Systems
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Estabilidade e estabilização de uma classe de sistemas não-lineares sujeitos a saturação
This work addresses the problem of stability analysis and stabilization of nonlinear rational systems subject to saturation. The approach used in this study is based on the differential algebraic representation (DAR) of rational systems and on a modified version of the generalized sector condition to deal with saturation. First, methods to characterize the s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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2. Equações Diferenciais por partes:ciclos limite e cones invaiantes / Piecewise differential equation: limit cycles and invariant cones
Neste trabalho, consideramos classes de sistemas lineares por partes descontínuos no plano e contínuos no espaço. No plano, analisamos sistemas do tipo foco-foco (FF), parabólico-foco (PF) e parabólico-parabólico (PP) separados pela reta x = 0 e demonstramos que podem aparecer até dois ciclos limite, dependendo de variações de parâmetros. Também e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2011
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3. Equações Diferenciais por partes:ciclos limite e cones invaiantes / Piecewise differential equation: limit cycles and invariant cones
Neste trabalho, consideramos classes de sistemas lineares por partes descontínuos no plano e contínuos no espaço. No plano, analisamos sistemas do tipo foco-foco (FF), parabólico-foco (PF) e parabólico-parabólico (PP) separados pela reta x = 0 e demonstramos que podem aparecer até dois ciclos limite, dependendo de variações de parâmetros. Também e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2011
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4. STOCHASTIC DYNAMIC PROGRAMMING AND CONVEX HULL ALGORITHM IN THE HYDROTHERMAL SYSTEMS OPERATION PLANNING / PROGRAMAÇÃO DINÂMICA ESTOCÁSTICA E ALGORITMO DE FECHOS CONVEXOS NO PLANEJAMENTO DA OPERAÇÃO DE SISTEMAS HIDROTÉRMICOS
This thesis presents a new approach for the expected-cost-to-go functions modeling used in the stochastic dynamic programming (SDP) algorithm. The proposed technique is applied to the long-term operation planning of electrical power systems. Using state space discretization, the convex hull algorithm is used for constructing a series of hyperplanes that comp
Publicado em: 2010
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5. 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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6. Aplicação de técnicas de programação linear e extensões para otimização da alocação de água em sistemas de recursos hídricos, utilizando métodos de pontos interiores. / Application of linear programming techniques and extensions for optimization of water allocation in water resource systems, using interior points methods.
This work presents an optimization tool for analyzing the problems of water allocation in watersheds by utilizing techniques of linear and piecewise linear programming integrated to a pattern of stream flow routing. The optimization is done in a global way with the usage of linear programming packages based upon the Internal Point Methods. The methodology of
Publicado em: 2006
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7. Determination of Linear Approach for Parts of Not Linear Functions for Embarked Systems Using Genetic Algorithms / Determinação de aproximação linear por partes de funções não lineares para sistemas embarcados utilizando algoritmos genéticos
In several applications in electronics, the generation of nonlinear function values using low-cost embedded systems is a problem. The nonlinear functions cannot be directly implemented due to restrictions of fixed-point calculations and limited resolution that are characteristics of the architecture of the processor employed. In this work, a procedure for de
Publicado em: 2005
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8. BID-BASED STRATEGIES FOR HYDRO PLANTS IN A MULTI-STAGE AND STOCHASTIC FRAMEWORK / ESTRATÉGIA DE OFERTA DE AGENTES HIDROELÉTRICOS SOB INCERTEZA E MÚLTIPLOS ESTÁGIOS
The objective of this work is to present a methodology for the strategic bidding (or bid-based) problem of a hydropower based company, taking into account multiple hydro plants, time-coupling, multiple inflow scenarios and illustrate its application for real case studies. It is initially show that the bid-based dispatch for a hydro plant can be formulated as
Publicado em: 2004
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9. Funções de Lyapunov lineares por partes para sistemas lineares discretos no tempo com saturação ou zona morta nos controles
This thesis is dedicated to stability analysis of linear discrete-time systems with saturation ar deadzone in feedback controls, with special attention to unstable open-Ioop systems. Linear systems with perfectly known parameters and systems with uncertain parameters constrained to a compact polytope are considered. For systems with saturations, the main obj
Publicado em: 2001
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10. Operação otima de subsistemas hidrotermicos interligados utilizando programação dinamica estocastica dual
The operation planning problem, in the medium term, is to determine the optimal strategy for thermal generation and interchange of energybetween subsystems. For multi-reservoirs hydroeletric systems, this is a stochastic and large-scale problem, and the optimal solution is found only using Stochastic Dynamic Programming. But this method requires the discreti
Publicado em: 1992
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11. Drainage basins and channel incision on Mars
Measurements acquired by the Mars Orbiter Laser Altimeter on board the Mars Global Surveyor indicate that large drainage systems on Mars have geomorphic characteristics inconsistent with prolonged erosion by surface runoff. We find the topography has not evolved to an expected equilibrium terrain form, even in areas where runoff incision has been previously
The National Academy of Sciences.