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Habilitation à diriger des recherches

Contribution à la surveillance des systèmes industriels complexes

Abstract : element(s) and at determining the failure cause(s). These information about the system state may be given to operators in order for them to act appropriately and/or may be used automatically to modify, reconfigure the control law and even the system itself or its mission.
In this report, I present a scientific synthesis that situates my contributions in this wide research field.
All monitoring methods rest on the availability of system information redundancy. Modelbased approaches consist in verifying the consistency between on-line measurements and a behaviour model under some operation hypothesis. The first step is to generate a set of
indicator signals, the so-called residuals. Two methods are classically used to generate these residuals : Analytical Redundancy Relations (ARR) -based method and observers-based ones.
Each of these tools, that have recently been extended to nonlinear models, shows advantages and drawbacks depending on the type of considered system (and model) and depending on the algorithms implementation. These works were initially devoted to FDI (Fault Detection and
Isolation) for continuous (or discretized) time system. They have been recently adjusted and extended to handle the problem of Dynamic Hybrid System monitoring.
When the considered system is complex, i.e. when it is constituted of a large number of physical components, a structural pre-treatment may allow to determine the monitorability properties of the system. Structural analysis is a powerful tool that doesn't need any explicit
knowledge of the model equations. However, it allows to determine the subsystems for which sophisticated FDI algorithms may be implemented.
A monitoring system is only a part of a more complete process that allows for the industrial equipment to work in security and to gain in productivity and quality even when failures occur. The control law may be constructed in order to use the monitoring information. In that case, Fault Tolerant Control (FTC) is invoked. A thought on research prospects is proposed all along the manuscript. Some more general research orientations are presented at the end of the document to complete these prospects.
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Vincent Cocquempot. Contribution à la surveillance des systèmes industriels complexes. Automatique / Robotique. Université des Sciences et Technologie de Lille - Lille I, 2004. ⟨tel-00197595⟩

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