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Robust Flatness-based Multi-controllers Approach

Hajer GHARSALLAOUI 
Unité de Recherche LA.R.A Automatique, Ecole Nationale d’Ingénieurs de Tunis
B.P. 37, le Belvédère, 1002 Tunis, TUNISIE

Mounir AYADI
Unité de Recherche LA.R.A Automatique, Ecole Nationale d’Ingénieurs de Tunis
B.P. 37, le Belvédère, 1002 Tunis, TUNISIE

Mohamed BENREJEB
Unité de Recherche LA.R.A Automatique, Ecole Nationale d’Ingénieurs de Tunis
B.P. 37, le Belvédère, 1002 Tunis, TUNISIE

Pierre BORNE
LAGIS, &EACUTEcole Centrale de Lille
B.P. 48, Villeneuve d’Ascq, 59651 Lille, FRANCE

Abstract: In this paper, a robust fault tolerant control reconfiguration is proposed. For identified models whose parameters change according to operating conditions, it is convenient to design a reconfiguration control strategy. This approach switches on-line the right controller to achieve the same performances for a given objective. This reconfiguration strategy is based on robust flatness-based switching control and developed in discrete-time framework in order to track a reference trajectory starting from a flat output variable. For each model, a corresponding flatness-based controller is designed and consequently, a multi-controller structure is obtained. The switching process is based on the minimization of a criterion. The performances obtained by switching in terms of tracking trajectory and disturbance fault rejection are discussed in this paper. The stability of the corresponding switched discrete-time linear systems is given.

Keywords: Flatness, tracking trajectory, robustness, switching, multi-controllers, reconfiguration.

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CITE THIS PAPER AS:
Hajer GHARSALLAOUI, Mounir AYADI, Mohamed BENREJEB, Pierre BORNE, Robust Flatness-based Multi-controllers Approach, Studies in Informatics and Control, ISSN 1220-1766, vol. 19 (4), pp. 357-368, 2010.