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132 results on '"Cardim, Rodrigo"'

6. Relaxed design conditions using Takagi-Sugeno fuzzy models and Lyapunov-Floquet transformation for controlling time-varying periodic systems.

Author

Travassos, Marco A, Cardim, Rodrigo, Teixeira, Marcelo CM, and Assunção, Edvaldo

Subjects
*TIME-varying systems, *LINEAR control systems, *CLOSED loop systems, *LINEAR matrix inequalities
Abstract

This manuscript approaches the Takagi-Sugeno fuzzy control technique, the Lyapunov-Floquet transformation, and their applications for controlling linear time-varying systems. Each of the techniques is applied in the control of a linear time-varying periodic system in order to compare their effectiveness. A hybrid control method involving the Takagi-Sugeno fuzzy control and the Lyapunov-Floquet transformation is proposed. In this method, the stability of the closed-loop system is mathematically guaranteed. In addition, this new procedure can reduce the conservatism of time-varying periodic systems with uncertainties in the input matrix. Finally, an application of the hybrid method is presented in a time-varying periodic system considering a constraint on input and uncertainties on the input matrix. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Hardware Implementation of an Analog Neural Nonderivative Optimizer

Author

Cardim, Rodrigo, Teixeira, Marcelo C. M., Assunção, Edvaldo, Oki, Nobuo, de Carvalho, Aparecido A., Covacic, Márcio R., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, King, Irwin, editor, Wang, Jun, editor, Chan, Lai-Wan, editor, and Wang, DeLiang, editor

Published
2006
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28. Robust T-S Fuzzy Control of Electrostimulation for Paraplegic Patients considering Norm-Bounded Uncertainties

Author

Covacic, Márcio Roberto, primary, Minhoto Teixeira, Marcelo Carvalho, additional, Augusto de Carvalho, Aparecido, additional, Cardim, Rodrigo, additional, Assunção, Edvaldo, additional, Sanches, Marcelo Augusto Assunção, additional, Fujimoto, Henrique Shuiti, additional, Mineo, Maxwell Simões, additional, Biazeto, Anderson Ross, additional, and Gaino, Ruberlei, additional

Published
2020
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32. On local H∞ switched controller design for uncertain T–S fuzzy systems subject to actuator saturation with unknown membership functions

Author

de Oliveira, Diogo Ramalho [UNESP], Teixeira, Marcelo Carvalho Minhoto [UNESP], Alves, Uiliam Nelson Lendzion Tomaz, de Souza, Wallysonn Alves, Assunção, Edvaldo [UNESP], Cardim, Rodrigo [UNESP], Science and Technology of Mato Grosso do Sul, Universidade Estadual Paulista (Unesp), Science and Technology of Paraná, and Science and Technology of Tocantins

Subjects
Local stability, Control signal saturation, Linear matrix inequality (LMI), Switched control, Takagi–Sugeno (T–S) fuzzy model, Control of uncertain nonlinear systems, H∞ control
Abstract

Made available in DSpace on 2018-12-11T17:17:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-08-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) This manuscript proposes a local H∞ switched controller design for a class of uncertain nonlinear plants described by Takagi–Sugeno (T–S) fuzzy models with unknown membership functions. The control design requires only the lower and upper bounds of the system nonlinearities and of the system linear parameters, which can depend on uncertain parameters. The switched control law chooses a state-feedback controller gain, which belongs to a given set of gains, that minimizes the time derivative of a quadratic Lyapunov function. This procedure eliminates the necessity of finding the membership function expressions to implement the control law, guarantees an H∞ performance and ensures that the state trajectory remains within a region in which the T–S fuzzy model is valid. Due to the H∞ control design, that frequently results in very large control inputs, it is considered that the switched control law is subject to actuator saturation. Finally, two examples are presented. The first example studies the control of a chaotic Lorenz system. It shows that, for disturbances with large magnitude, the proposed procedures provided better results than the obtained with another recent method found in the literature, that considers full access to the membership functions. In the second example, a practical implementation of an active nonlinear suspension control system, considering an uncertain bounded mass and a fault in the actuator, confirms the effectiveness of the proposed approach. IFMS – Federal Institute of Education Science and Technology of Mato Grosso do Sul, Campus of Três Lagoas, 79.641-162 São Paulo State University (UNESP) Department of Electrical Engineering, Campus of Ilha Solteira IFPR – Federal Institute of Education Science and Technology of Paraná, Campus of Jacarezinho, 86.400-000 IFTO – Federal Institute of Education Science and Technology of Tocantins Department of Mathematics and Natural Sciences, Campus of Palmas, 77.021-090 São Paulo State University (UNESP) Department of Electrical Engineering, Campus of Ilha Solteira FAPESP: 2011/17610-0

Published
2018

38. Output control of continuous-time uncertain switched linear systems via switched static output feedback.

Author

Carniato, Leonardo Ataide, Carniato, Alexandre Ataide, Teixeira, Marcelo Carvalho Minhoto, Cardim, Rodrigo, Mainardi Junior, Edson Italo, and Assunção, Edvaldo

Abstract

This paper is devoted to the robust H ∞ and guaranteed cost control problems for continuous-time switched linear systems with polytopic uncertainties, considering an output-dependent switching law and a switched static output feedback controller. The proposed method offers new sufficient conditions based on Linear Matrix Inequalities (LMIs) for designing the switching strategy. In order to provide extra free dimensions in the solution space, some conditions become a special class of Bilinear Matrix Inequalities (BMIs). Therefore, the hybrid algorithm Differential Evolution–Linear Matrix Inequality is proposed for obtaining feasible solutions of this NP-hard problem. Theoretical analyses and numerical examples show that these new procedures reduce the design conservatism of two recent known methods for solving the presented control problems. Besides, a practical application of the method in the design and simulation of a robust switched controller of a switched semi-active suspension is performed. [ABSTRACT FROM AUTHOR]

Published
2020
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49. Robust State-Derivative Feedback LMI-Based Designs for Linear Descriptor Systems

Author

Faria, Flávio A., Assunção, Edvaldo, Teixeira, Marcelo C. M., and Cardim, Rodrigo

Subjects
Article Subject
Abstract

Techniques for stabilization of linear descriptor systems by state-derivative feedback are proposed. The methods are based on Linear Matrix Inequalities (LMIs) and assume that the plant is a controllable system with poles different from zero. They can include design constraints such as: decay rate, bounds on output peak and bounds on the state-derivative feedback matrix K, and can be applied in a class of uncertain systems subject to structural failures. These designs consider a broader class of plants than the related results available in the literature. The LMI can be efficiently solved using convex programming techniques. Numerical examples illustrate the efficiency of the proposed methods.

Published
2010
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