2943 articles  [version française]
 HAL: hal-00686967, version 1
 Available versions: v1 (2012-04-11) v2 (2012-07-19)
 Controllability of two coupled wave equations on a compact manifold
 (2012-04-11)
 We consider the exact controllability problem on a compact manifold $\Omega$ for two coupled wave equations, with a control function acting on one of them only. Action on the second wave equation is obtained through a coupling term. First, when the two waves propagate with the same speed, we introduce the time $\T_0$ for which all geodesics traveling in $\Omega$ went through the control region $\omega$, then through the coupling region $\O$, and finally came back in $\omega$. We prove that the system is controllable if and only if both $\omega$ and $\O$ satisfy the Geometric Control Condition and the control time is larger than $\T_0$. Second, we prove that the associated HUM control operator is a pseudodifferential operator and we exhibit its principal symbol. Finally, if the two waves propagate with different speeds, we give sharp sufficient controllability conditions on the functional spaces, the geometry of the sets $\omega$ and $\O$, and the minimal time.
 1: Laboratoire de Modélisation Mathématique et Numérique dans les Sciences de l'Ingénieur (LAMSIN) ENIT 2: Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO) Université d'Orléans – CNRS : UMR7349 3: Laboratoire de Mathématiques d'Orsay (LM-Orsay) CNRS : UMR8628 – Université Paris XI - Paris Sud
 Subject : Mathematics/Analysis of PDEs
 Keyword(s): Wave equation – system – microlocal defect measures – controllability – HUM operator
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 hal-00686967, version 1 http://hal.archives-ouvertes.fr/hal-00686967 oai:hal.archives-ouvertes.fr:hal-00686967 From: Matthieu Léautaud <> Submitted on: Wednesday, 11 April 2012 17:31:46 Updated on: Wednesday, 11 April 2012 18:20:55