Stability Theory And Control Of Systems
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Sistemas dinâmicos: bacias de atração e aplicações / Dynamical systems: basins of attraction and aplications
The present work proposes to present a description of the theory on the basins of attraction of hyperbolic equilibrium points of continuous dynamical systems, to develop a method for the numerical determination of these basins and to examine the results of applying the theory and method in models of population dynamics. The determination of the basins of att
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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2. Controlador nebuloso por modos deslizantes adaptativo
In this work, an Adaptive Sliding Neurofuzzy Controller was proposed and its parameters had been established and well characterized. In this way, some concepts of the theories of neurofuzzy networks, sliding mode control and adaptive control had been treated. The considered controller presents only three inference rules and a low computational effort. It was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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3. An adaptive fuzzy dead-zone compensation scheme and its application to electro-hydraulic systems
The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control systems stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the last decades to both control and identification of uncertain dy
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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4. Triangular forms for nonlinear systems with two inputs and control of driftless systems on SU(n) with applications in quantum mechanics. / Formas triangulares para sistemas não-lineares com duas entradas e controle de sistemas sem arrasto em SU(n) com aplicações em mecânica quântica.
A presente tese aborda dois problemas distintos e independentes: triangularização de sistemas não-lineares com duas entradas e controle de sistemas sem arrasto que evoluem no grupo especial unitário SU(n). Em relação ao primeiro, estabeleceu-se, através da generalização de resultados bem conhecidos, condições geométricas para que um sistema com d
Publicado em: 2010
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5. Stability analysis of analog-digital control systems as a function of the samplint period / Análise da estabilidade de sistemas de controle analógicos-digitais em função do período de amostragem
In this work the stability of analog-digital control systems as a function of the sampling period is analyzed. A new rule of bilinear s-z mapping with two parameters is proposed, tested, analyzed and compared with some classical rules. A mathematical model for the aliasing is also proposed. Investigations on the stability/instability boundaries of analog-dig
Publicado em: 2009
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6. Estabilidade e controle com criterio de custo medio a longo prazo em sistemas lineares estocasticos / Stability and control of linear stochastic systems with long-run average cost criterion
This monograph presents results on stability and control of stochastic systems represented by linear operators with respect to the state which are non-linear with respect to the control. The control seeks to optimize a long run average cost (LRAC). The control structure does not depend on the past history of the process and it can be used, in particular, to
Publicado em: 2009
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7. Control of dynamic systems : absolute stability, saturation and bilinearity / Controle de sistemas dinamicos : estabilidade absoluta, saturação e bilinearidade
This thesis presents contributions to the solution of the problems of stability analysis and synthesis of state feedback controllers for dynamic systems with non-linear elements, by means of conditions based on linear matrix inequalities and Lyapunov functions. For switched systems subject to saturation in the actuators, convex conditions to design switched
Publicado em: 2009
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8. Controle por modos deslizantes aplicado a sistema de posicionamento dinâmico. / Sliding mode control applied to dynamic positioning systems.
This paper presents the application of the robust and nonlinear sliding mode control theory to the dynamic positioning systems for floating vessel, with experimental validation. The objective of the control system designed is to keep the vessel next a specific position (set-point) or follow a pre-defined trajectory (pathfollowing) through the action of prope
Publicado em: 2009
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9. Control and filtering of time-varying linear systems via parameter dependent Lyapunov functions / Controle e filtragem de sistemas lineares variantes no tempo por meio de funções de Lyapunov dependentes de parametros
The main contribution of this dissertation is to propose conditions for linear filter and controller design, considering both robust and parameter dependent structures, for discrete time-varying systems. The controllers, or filters, are obtained through the solution of optimization problems, formulated in terms of bilinear matrix inequalities, using a method
Publicado em: 2009
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10. Stability analysis and state feedback design of polytopic dynamic systems via multipliers / Analise de estabilidade e realimentação de estado de sistemas dinamicos politopicos via multiplicadores
This thesis is devoted to analysis and controllers design for polytopic systems in the Linear Matrix Inequalities (LMls) and Multipliers framework. We develop concepts related to the analysis of dynamic systems stability in terms of multipliers, so we are able to provide sufficient conditions for robust stability and performance. Moreover, we introduce param
Publicado em: 2006
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11. Robust pole placement and stability analysis of interval systems with data dependencies / Alocação de polos e estabilidade robustas de sistemas intervalares com tratamento de multiincidencias de parametros
This Dissertation is focused on control system design and stability analysis of linear timeinvariant uncertain plants, with uncertainties of interval nature. The control system design problem is treated in the context of the pole placement technique. An extension of the classical technique to robust pole placement based on Interval Analysis is proposed. The
Publicado em: 2006
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12. 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