Uncertain Linear Systems
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Controle robusto por alocação de polos via analise intervalar modal / Robust control by pole assignement using modal intervals analysis
Uma abordagem baseada em análise intervalar para o projeto de controladores por realimentação de estados robusta é proposta. Demonstra-se que quando especificações para alocação de pólos são representadas por conjuntos espectrais de polinômios intervalares, o problema do projeto por realimentação de estados robusta pode ser completamente formula
Publicado em: 2006
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14. Controle preditivo robusto de sistemas hibridos incertos integrando restrições, logica, e dinamica baseada em series de funções ortonormais / Robust model based predictive control of uncertain hybrid systems integrating constraints, logic, and dynamics based on orthonormal series function
Model-based Predictive Control (MPC) has been attracting interest in both academic and industrial areas since the 1970 s. The MPC methodology has been recently extended to a class of hybrid systems described by dynamics and logic rules. Logical propositions are performed by using, for example, IF /THEN/ELSE operators. Due to performance requirements, the non
Publicado em: 2006
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15. Guaranteed cost fuzzy controllers for a class of uncertain nonlinear dynamic systems
Stability analysis and a systematic robust fuzzy control design for uncertain nonlinear systems with polytopic uncertainties are presented. The approach given uses the T-S fuzzy systems which are represented by a family of local uncertain linear systems with aggregation. The resulting fuzzy controller is a blending of state feedback gains obtained from a gua
Computational & Applied Mathematics. Publicado em: 2005-04
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16. Estabilidade e controle de sistemas lineares variantes no tempo e de sistemas chaveados lineares
This thesis presents contributions to the solution of problems of stability analysis and control synthesis applied to linear systems with time-varying parameters belonging to a polytope and to switched linear systems subject to arbitrary switching functions using linear matrix inequality conditions based on Lyapunov functions. Concerning linear time-varying
Publicado em: 2005
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17. Analise de estabilidade e controle de sistemas lineares incertos por funções de Lyapunov dependentes de parametros
This work deals with the study of sufficient robust stability conditions for uncertain linear systems (politopic uncertainty), in both continuous and discrete-time, using parameter dependent Lyapunov functions and Linear Matrix Inequalities (LMI s). The robust stability conditions are directly used to determine the stability domain of uncertain linear system
Publicado em: 2003
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18. Analysis and synthesis of robust control system with separable nonlinearities.
The objective of this thesis is to propose a design method for controllers to secure specified robust oscillation amplitude and frequency for separable nonlinear systems exhibiting unavoidable or desirable limit cycles. The design approach of robust limit cycle controllers introduced here can be used for autonomous systems with separable single-input-single-
Publicado em: 2003
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19. Adaptive neural control of a class of unknown nonlinear systems.
The well-known capacity of the neural networks structures to approximate functions and nonlinear systems, to any degree of accuracy, on a compact domain, has motivated its use in actual control problems where the presence of uncertainties is inevitable. Neural networks models can be used to parameterize unknown nonlinearities, hence, the linear parameterizat
Publicado em: 2002
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20. 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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21. Filtragem robusta : uma abordagem por desigualdades matriciais lineares
: This work deals with the problem of robust filtering for both continuous and discrete-time dynamic linear systems. More precisely, the problem of full order linear filtering for uncertain systems with Hoo norm performance criterion is analyzed. Firstly, the results from the literature based on Riccati like equations and (for norm bounded uncertainty) on co
Publicado em: 1998
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22. Analise e controle de sistemas lineares via desigualdades matriciais convexas
This work proposes a convex optimization approach to the analysis and control synthesis oí uncertain linear systems. More precisely, classical results based on the Lyapunov equation (stability) and the Riccati equation (linear quadratic synthesis) are extended to the uncertain case, yielding convex optimization problems formulated in terms of a set of matri
Publicado em: 1994
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23. Sistemas lineares sujeitos a restrições : regulação robusta e alocação regional parcial de polos
Using the theory of positively invariant polyhedral sets, the problem of robust regulation of uncertain linear continuous-time systems, considering symmetrical constraints on the state and control vectors and uncertain domain defined by intervals of A and B matrices, is studied. For computacional solution of this problem, an efficient linear programming appr
Publicado em: 1994
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24. Controle robusto de sistemas incertos continuos com alocação de polos
This work adresses the state feedback control design for linear continuous time systems with regional pole constraints. The subregions of the complex plane considered are: vertical strip, circle and parabolic region. Uncertain systems in convex bounded domains can also be handled. The performace cri teria used are: H IND. 2? norm, H IND. INFINITO? norm and m
Publicado em: 1994