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Adaptive Finite-time Observer for a Nonlinear and Flexible Space Launch Vehicle

E. Durrafourg L. Burlion Tarek Ahmed-Ali 1 Françoise Lamnabhi-Lagarrigue 2
1 Equipe Automatique - Laboratoire GREYC - UMR6072
GREYC - Groupe de Recherche en Informatique, Image, Automatique et Instrumentation de Caen
Abstract : In this paper we propose a new finite-time state observer for a nonlinear space launch vehicle with flexible dynamics and uncertain parameters. Indeed, flexible states are required to ensure nonlinear control objectives of both reference path tracking and bending mode damping. Our main contribution is to show that it is enough to observe a sublinear uncertain system to ensure a finite-time convergence of the whole state. For that purpose, a Luenberger observer is mixed with a parameter and initial state estimator, based on algebraic estimation tools. Closed loop simulations show the effectiveness of the observer in combination with a backstepping control design (extended to flexible systems).
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Submitted on : Tuesday, January 13, 2015 - 12:44:23 PM
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E. Durrafourg, L. Burlion, Tarek Ahmed-Ali, Françoise Lamnabhi-Lagarrigue. Adaptive Finite-time Observer for a Nonlinear and Flexible Space Launch Vehicle. 19th IFAC World Congress on International Federation of Automatic Control (IFAC 2014), Aug 2014, CapeTown, South Africa. pp.546-551, ⟨10.3182/20140824-6-ZA-1003.01158⟩. ⟨hal-01102692⟩



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