171 6.2.1 Développement du critère d'optimisation, p.184 ,
Unétatà 10 composantes est obtenu, alors que´ etatàetat`etatà 8 composantes. C'est d'ailleurs cettedernì ere version qui est présentée dans ce mémoire Une dynamique du premier ordre pour la perturbation et la dynamique des MD est analysée. Des courbes de performance enénergieen´enénergie cohérente en fonction de la constante de temps du MD y sont présentées afin de montrer l'apport de la commande optimale 2010] généralisent ensuite le formalisme aux modèles d'ordre deux et l'utilisent dans le cadre de l'application au ELT Européen o` u les perturbation sont celles dû au vent, donc de variance bien plusélevéeplus´plusélevée que les perturbation de phase d'origine purement atmosphérique. Ce cas particulier est traité dans la section suivante. L'article soumis [Correia et al., 2009c] reprend la formulation de l'article précédent en rajoutant uné etude de robustesse et des explications supplémentaires sur la commande modale des MD avec dynamique non négligeable. L'innovation par rapport aux cas considérés précédemment est l'inclusion des perturbations dues au vent, déjà discutéesdiscutées`discutéesà la section 6, 2008. ,
dynamiques du second ordre L'ELT Européen est un télescope adaptatif : sa conception optique inclut en effet plusieurs miroirs pré-focaux [Gilmozzi et Spyromilio Plus précisément le couple M4/M5 est composé d'un miroir avec 5000-7000 actionneurs et d'un miroir, en l'occurrence M5, 2008. ,
Les modèlesmodèles`modèlesàmodèlesà´modèlesàéléments finis actuels ne considèrent pas les supports des miroirs ni l'ensemble de la structure mécanique Une discussion plusélargieplus´plusélargie sur la modélisation des composant adaptatifs se trouve dans L'ensemble des résultats dans cette section ont fait objet de l'article [Correia et al., 2010]. Les résultats principaux présentés dans le cadre de cet article sont rappelés dans les deux sous-sections suivantes, 2008. ,
synthétiséà partir de ces paramètres identifiés, il s'agit donc d'un cas de cohérence perturbation/modèle pour la commande ,
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