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<dc:title xml:lang="fr">Stabilisation polynomiale et contrôlabilité exacte des équations des ondes par des contrôles indirects et dynamiques</dc:title>
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<dc:subject xml:lang="fr">Semi groupes</dc:subject>
<dc:subject xml:lang="fr">Équations des ondes</dc:subject>
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<dc:subject xml:lang="fr">Contrôle direct</dc:subject>
<dc:subject xml:lang="fr">Méthode de HUM</dc:subject>
<dc:subject xml:lang="fr">Méthode des multiplicateurs</dc:subject>
<dc:subject xml:lang="fr">Méthode fréquentielle</dc:subject>
<dc:subject xml:lang="fr">Stabilité forte</dc:subject>
<dc:subject xml:lang="fr">Stabilité uniforme</dc:subject>
<dc:subject xml:lang="fr">Stabilité polynomiale</dc:subject>
<dc:subject xml:lang="fr">Contrôlabilité exacte</dc:subject>
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<dc:subject xml:lang="en">Coupled system</dc:subject>
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<dc:subject xml:lang="en">Uniform stability</dc:subject>
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<dcterms:abstract xml:lang="fr">La thèse est portée essentiellement sur la stabilisation et la contrôlabilité de deux équations des ondes moyennant un seul contrôle agissant sur le bord du domaine. Dans le cas du contrôle dynamique, le contrôle est introduit dans le système par une équation différentielle agissant sur le bord. C'est en effet un système hybride. Le contrôle peut être aussi applique directement sur le bord d'une équation, c'est le cas du contrôle indirecte mais non borne. La nature du système ainsi coupledépend du couplage des équations, et ceci donne divers résultats par la stabilisation (exponentielle et polynomiale) et la contrôlabilité exacte (espace contrôlable). Des nouvelles inégalités d'énergie permettent de mettre en oeuvre la Méthode fréquentielle et la Méthode d'Unicité de Hilbert.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis is concerned with the stabilization and the exact controllability of two wave equations by means of only one control acting on the boundary of the domain. In the case of dynamic control, the control is introduced into the system by differential equation acting on the boundary. It is indeed a hybrid system. The control can be also applied directly on the boundary of one of the equations. In this case, the control is indirect but unbounded. The behavior of the obtained system depends on theways of coupling. Various results are established for the stabilization (exponential or polynomial) and the exact controllability (controllable space of initial data). A new inequality of energy allows to apply the Frequency Method and the Hilbert Uniqueness Method.</dcterms:abstract>
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