121 A.4.1 Estimations d'erreur, p.123 ,
algorithmes mettant en oeuvre la méthode des séries de Fourier ontétéontété développés, permettant une approche de la transformée de Laplace inverse par une série de Fourier infinie Koizumi [47] publie le premier article utilisant une telle procédure numérique. Parmi les plus populaires procédures qui ont suivi, on cite Dubner-Abate, Hosono Honig-Hirdes (1984) et Piessens-Huysmans, p.Crump, 1935. ,
utilisant la déformation du contour dans l'intégrale de Bromwich, figure parmi les meilleures approches pour calculer la transformée de Laplace inverse. L'article de référence de cette approche a ´ eté publié par Talbot, 1979. ,
onétudieonétudie plusieurs algorithmes utilisant cette approche. On portera une attentionparticulì erè a la méthode proposant l ,
optimalité des paramètres n'a pasétépasété formellementétablieformellementétablie De plus, les résultats sont " optimaux " pour un temps t donné et aucune preuve de leur efficacité pour les autres temps n'a ´ eté apportée ,
130 B.1.2 Approche semi-décentralisée via unprobì eme inverse du contrôle optimal distribué, Sommaire B.1 Systèmes Distribués Invariant, p.131 ,
il existe un contrôle u(t, ?) invariant par translation du système (B.1) qui minimise (B.3), voir, Ce contrôle optimal de (B.1) peutêtrepeutêtre facilement obtenu en appliquant la transformée de Fourier inversè a ,
est une fonction irrationnelle de ?. Ainsi, le contrôleur ne peut pasêtrepasêtre mis en oeuvre par uné equation aux dérivées partielles (EDP) en t et ? ,
la décroissance exponentielle rapide en espace de K a ´ etéetéétablie Cela signifie que le contrôleur optimal résultant a un degré de localisation spatiale et peut doncêtredoncêtre mis en oeuvre d'une façon distribuée ,
auteur propose une stratégie pour la conception de contrôleurs optimaux semi-décentralisés, détaillée dans la section suivante ,
1) est invariant en espaceauteur propose unprobì eme inverse optimal de stabilisation exponentielle associéassociéà (B.1) Ceprobì eme est dit inverse dans le sens o` u le contrôle qui stabilise le système (B.1), minimise une fonctionnelle de coût choisie a posteriori Autrement dit, les opérateurs Q et R dans la fonctionnelle (B.3) ne sont pas a priori fixés. Ils sont plutôt choisis a posteriori par la stabilisation exponentielle de l'´ etat-feedback. Concernant l'optimalité On the laguerre-method for numerically inverting laplace transforms, Dans cette section, on suppose que le système, pp.413-427, 1996. ,
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