Uncertain Linear Systems
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Estratégias com garantia de estabilidade para a integração de controle preditivo e otimização em tempo real. / Strategies with guarantee of stability for the integration of model predictive control and real time optimization
The aim of this Thesis is the development of predictive controllers (MPC) with guarantee of stability and that are part of a control structure where Real Time Optimization (RTO) is present and produces optimizing targets for the predictive controller. The approaches of two and three-layer are considered. Three different strategies are presented: the first st
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2012
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2. 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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3. Filtragem robusta de sistemas lineares invariantes no tempo por meio de funções de Lyapunov polinomiais / Robust filtering of linear time invariant systems by means of polynomial Lyapunov functions
This work presents new convex optimization procedures for full order robust H2 and H? filter design for continuous and discrete-time uncertain linear systems. The time-invariant uncertain parameters are supposed to belong to a polytope with known vertices. Thanks to the use of a larger number of slack variables and homogeneous polynomial relaxations, linear
Publicado em: 2010
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4. Estimadores robustos para sistemas lineares e não-lineares
The main focus of this dissertation is to develop and analyze robust estimators for linear and nonlinear discrete time systems subject to uncertainties. The design of the estimators, using the Riccati equation approach, leads to a guaranteed cost for all allowed uncertainties within a known set. Assuming norm bounded uncertainties, it is proposed a general r
Publicado em: 2009
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5. Realimentação de saida robusta a partir de controladores dependentes de parametros para sistemas lineares incertos discretos no tempo / Robust output feedback starting from parameter-dependent controllers for discrete-time uncertain linear systems
Esta dissertação trata de um dos mais importantes problemas em aberto na teoria de controle, o projeto de controladores por realimentação estática de saída. A principal contribuição é propor um método para computar controladores robustos estáticos por realimentação de saída para sistemas lineares incertos discretos no tempo, usando um controlad
Publicado em: 2009
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6. Filtros de Kalman robustos para sistemas dinâmicos singulares em tempo discreto / Robust Kalman filters for discrete-time singular systems
This thesis considers the optimal robust estimates problem for discrete-time singular dymanic systems. New recursive algorithms are developed for the Kalman filtered and predicted estimated recursions with the corresponding Riccati equations. The singular robust Kalman type filter and the corresponding recursive Riccati equation arer obtained in their most g
Publicado em: 2009
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7. Estudo de tecnicas de controle H-infinito para estruturas flexiveis com intercentezas / A study on H-inifinity control techniques for uncertain flexible structures
This dissertation deals with modern techniques from the Robust H? Control of Linear Dynamic Systems. By this it is meant that the results from linear control systems theory are used as mathemathical tools when considering several kinds of uncertainty on the models. These models are mostly of flexible structures and the design methods are implemented using so
Publicado em: 2008
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8. Estabilidade e síntese de controladores e filtros robustos para sistemas com retardo no tempo: novas fronteiras
This thesis is dedicated to the study of some inherent problems in continuous-time systems with time delay. The thesis is divided into two parts; the first one shows that to study the stability of an autonomous linear system with constant time delay is equivalent to assess the roots of a rational function of appopriate degree. The second part deals with a se
Publicado em: 2008
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9. Ferramenta para Avaliação da Energia Firme Baseada em Técnica de Pontos Interiores / A tool for Evaluation of Firm Energy Based on Interior Point Technique
The energy sector planning is fundamental to assure the energy supply at the smallest costs and risks and with the smallest socioeconomic and environmental impacts for the society. These factors as well as the aspects complexity involved in the industry operation of the electrical energy production explain the importance of the energy sector planning. Nowada
Publicado em: 2008
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10. Estudo da relação entre a força aplicada e o deslocamento da articulação do tornozelo durante a manobra de mobilização articular ântero-posterior do tálus em indivíduos assintomáticos
Anteroposterior mobilization of the talus is a technique recommended for improvement of accessory motion and ankle dorsiflexion range of motion (ROM). Maitlands concept of assessment and treatment has empirical basis and its mechanism of action remains uncertain, although there is evidence of its efficiency. The purpose of this study was to determinate the c
Publicado em: 2007
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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. Estudo de robustez em sistemas lineares por meio de relaxações em termos de desigualdades matriciais lineares / Robustness of linear systems by means of linear matrix inequalities relaxations
This thesis proposes, as main contribution, a new methodology to solve parameterdependent linear matrix inequalities which frequently appear in robust analysis and control problems of linear system with polytopic uncertainties. The proposed method relies on the parametrization of the solutions in terms of homogeneous polynomials of arbitrary degree with matr
Publicado em: 2006