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Diagnostic des systèmes non linéaires - Contribution aux méthodes de découplage

Abstract : The main work presented in this document deals with the diagnosis of nonlinear systems in continuous time. The residual generation for fault isolation are considered with respect to the following steps: - the first step consists of decoupling the disturbance effect from a part of the system state. We propose a method which aims at reducing the dimension of this state subspace in order to limit the propagation of disturbances in the subspace to a maximum ; - the second step is the study of the state subspaces sensitive to the considered faults with the aim of determining if it is possible to detect and isolate all faults. Assuming that faults do not occur simultaneously, isolation conditions less restrictive than those solving the F.P.R.G. are proposed ; - the third step corresponds to the filter synthesis. A systematic method ensuring an explicit expression of the output injection is proposed. Moreover, a convergence study of the estimated state and the real state is included within the filter design. These techniques are applied to the ``three tank'' system in simulation which highlight the obtained results. Finally new results leading to one intrinsic definition of fault isolation in linear case have been presented and should be extended to nonlinear systems.
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Contributor : Cédric Join <>
Submitted on : Thursday, September 18, 2003 - 8:55:13 AM
Last modification on : Friday, October 23, 2020 - 8:38:03 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:05:06 PM


  • HAL Id : tel-00003393, version 1



Cédric Join. Diagnostic des systèmes non linéaires - Contribution aux méthodes de découplage. Automatique / Robotique. Université Henri Poincaré - Nancy I, 2002. Français. ⟨tel-00003393⟩



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