Contribution à la tolérance aux défauts des systèmes linéaires : Synthèse de méthodes d'accommodation fondée sur l'information du second ordre

Abstract : This thesis is devoted to the synthesis of accommodation methods founded on the second order information (SOI) assignment in the context of fault tolerance for deterministic linear systems. The major contribution of this research concerns using this information in the reconfigurability analysis (capability of the system to respond to faults) and developing strategies for fault accommodation in order to recover nominal performances in terms of system dynamics and also to guarantee the assigned second order information. Firstly, approaches for measuring the SOI using the system's input/output data are proposed. A first approach based on the initial response is considered. An interesting alternative to this approach, in considering the problem as one of identification, is proposed as an indirect computation of the SOI but online and using input/output data. An index based on reconfigurability, which is directly related to the SOI, is also proposed. Based on this online SOI computation, the index is applied to networked control systems affected by network induced delays in order to calculate their impact over the system. Secondly, fault accommodation strategies for loss of effectiveness type faults are proposed under the feedback SOI synthesis. SISO systems are first considered, approach founded on the modified pseudo inverse method. On the other hand, a strategy for MIMO systems founded on the pseudo inverse method is taken into account. Examples illustrating the application of the approaches are also presented. All these developed approaches are applied and illustrated through the well known process benchmark: the three tank hydraulic system. The simulations show up and notice the results obtained, and bring out the contribution of the developed approaches.
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Brian Manuel Gonzalez Contreras. Contribution à la tolérance aux défauts des systèmes linéaires : Synthèse de méthodes d'accommodation fondée sur l'information du second ordre. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10008⟩. ⟨tel-01748499⟩

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