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Constructive exact control of semilinear 1D wave equations by a least-squares approach

Abstract : It has been proved by Zuazua in the nineties that the internally controlled semilinear 1D wave equation ∂tty − ∂xxy + g(y) = f 1ω, with Dirichlet boundary conditions, is exactly controllable in H 1 0 (0, 1) ∩ L 2 (0, 1) with controls f ∈ L 2 ((0, 1) × (0, T)), for any T > 0 and any nonempty open subset ω of (0, 1), assuming that g ∈ C 1 (R) does not grow faster than β|x| ln 2 |x| at infinity for some β > 0 small enough. The proof, based on the Leray-Schauder fixed point theorem, is however not constructive. In this article, we design a constructive proof and algorithm for the exact controllability of semilinear 1D wave equations. Assuming that g does not grow faster than β ln 2 |x| at infinity for some β > 0 small enough and that g is uniformly Hölder continuous on R with exponent s ∈ [0, 1], we design a least-squares algorithm yielding an explicit sequence converging to a controlled solution for the semilinear equation, at least with order 1 + s after a finite number of iterations.
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https://hal.archives-ouvertes.fr/hal-03007045
Contributor : Arnaud Munch <>
Submitted on : Monday, November 16, 2020 - 11:10:06 AM
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  • HAL Id : hal-03007045, version 1

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Arnaud Munch, Emmanuel Trélat. Constructive exact control of semilinear 1D wave equations by a least-squares approach. 2020. ⟨hal-03007045⟩

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