Abstract
In this paper, we investigate the synthesis of minimum functional state observer for unperturbed and perturbed linear time invariant systems. The principal contribution is the design of a minimum functional state observer, which can estimate directly the state feedback control law. Hence, for the linear time invariant systems, the existence conditions of a minimum functional state observer are obtained by verification of a special dimension condition on system matrices. As a matter of fact, the exact solution of the proposed approach is determined, and the minimum functional state observer that has the same dimension as the control vector is derived by solving a set of linear matrix inequality (LMI) constraints. Whereas, for perturbed linear systems, the proposed minimum functional state observer scheme is developed to ensure the robust quadratic stability of the augmented system. The robustness issue is given via the reconstructed control law designed using an LMI based H∞ method; so that the desired design matrices are derived through the resolution of an optimum LMI system. The effectiveness and usefulness of the proposed approach are validated through a flexible link robot example.
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Recommended by Associate Editor M. Chadli under the direction of Editor Duk-Sun Shim.
Ridha Aloui received his Master of Automatic and Numerical Treatment and his Ph.D. Thesis in Electrical Engineering both from Ecole Supérieure des Sciences Techniques de Tunis, in 2004 and 2010 respectively. He is currently an Assistant Professor in Institut National des Sciences Appliquées et de la Technologie de Tunis and a member of Laboratory of Advanced Systems (LSA) in the Ecole Polytechnique de Tunisie. His current research interests include observation and control design methods for nonlinear complex systems with application on electromechanical processes.
Naceur Benhadj Braiek received his Master of Electrical Engineering and the Master of Systems Analysis and Numerical Treatment, both from Ecole Nationale d’Ingénieurs de Tunis in 1987, the Master of Automatic Control from Institut Industriel du Nord (Ecole Centrale de Lille) in 1988, the Ph.D. degree in Automatic control from Université des Sciences et Techniques de Lille, France, in 1990, and the Doctorat d’Etat in Electrical Engineering from Ecole Nationale d’Ingénieurs de Tunis in 1995. Now, he is a Professor of Electrical Engineering at the University of Tunisia. He is the Director of the Laboratory of Advanced Systems (LSA) at the Ecole Polytechnique de Tunisie. His domain of interests is related to the modelling, analysis and control of nonlinear systems with applications on electrical processes.
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Aloui, R., Braiek, N.B. Synthesis of a Minimum Functional State Observer Approach for Unperturbed/Perturbed Dynamical Systems. Int. J. Control Autom. Syst. 16, 1736–1745 (2018). https://doi.org/10.1007/s12555-017-0144-9
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DOI: https://doi.org/10.1007/s12555-017-0144-9