. , 84 3.1.3 Diagnostic appliqué aux systèmes retardés, vol.87

. Commande and . .. Défauts,

. .. Conclusion,

, Chapitre 3. Diagnostic et commande sans modèle tolérante aux défauts

, Nous remarquons là encore que le suivi de trajectoire est parfaitement assuré et que seule

, La gure 3.20, quant à elle, présente les mêmes résultats lorsqu'un défaut système est présent à partir de t = 35s

, Les adaptations de ? 1 (t) et ? 2 (t) se trouvent impactées lors de l'apparition du défaut et absorbent l'eet de celui-ci. Ceci est tout à fait normal car nous avons observé dans la partie précédente qu'un défaut système impacte tous les signaux, Une fois encore, les résultats obtenus sont très bons

, Pour conclure cette partie, nous présentons gure 3.21 les résultats obtenus lorsque l'amplitude du défaut système ou d'actionneur devient trop importante pour que la commande sans modèle puisse s'en accommoder

. Dans-le-cas-d'un-défaut-système, Ainsi pour ?a = 9, nous observons que le système devient instable. La commande n'arrive pas à compenser l'eet du défaut. Lorsque l'amplitude du défaut devient trop importante, nous ne pouvons proposer de méthode permettant d'assurer la stabilité du système. Dans ce cas, la robustesse intrinsèque de la commande sans modèle ne sut plus à assurer la stabilité du système en défaut, nous remarquons que la commande peut être déstabilisée car ? n'est plus approprié à cette dynamique (gure 3.21a)

. En-revanche and . Dans-le-cas-d'un-défaut-d, actionneur important (gure 3.21b pour une perte de puissance de 85%), la commande sans modèle met un peu plus de temps à réagir mais le défaut est bien corrigé et les performances de la commande sans modèle restent acceptables. Naturellement, ceci est valable lorsqu

, En pratique, l'utilisation d'actionneurs surdimensionnés est très rare car coûteuse. Il faudra donc s'attendre à d'éventuelles déstabilisations à l'instar des défauts système. 3.3. Conclusion (a) Réponses temporelles y i avec un défaut système trop important. (b) Réponses temporelles y i avec un défaut d'actionneur important

, Figure 3.21 Réponses temporelles des sorties obtenues pour des défauts importants

. Enn, une application plus approfondie des méthodes présentées dans cette thèse sur les systèmes décrits par des équations aux dérivées partielles représenterait une véritable avancée

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