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# Identification of generalized impedance boundary conditions: some numerical issues

* Corresponding author
1 POEMS - Propagation des Ondes : Étude Mathématique et Simulation
Inria Saclay - Ile de France, UMA - Unité de Mathématiques Appliquées, CNRS - Centre National de la Recherche Scientifique : UMR7231
2 DeFI - Shape reconstruction and identification
CMAP - Centre de Mathématiques Appliquées - Ecole Polytechnique, Inria Saclay - Ile de France
Abstract : We are interested in the identification of a Generalized Impedance Boundary Condition from the far fields created by one or several incident plane waves at a fixed frequency. We focus on the particular case where this boundary condition is expressed as a second order surface operator: the inverse problem then amounts to retrieve the two functions $\lambda$ and $\mu$ that define this boundary operator. We first derive a new type of stability estimate for the identification of $\lambda$ and $\mu$ from the far field when inexact knowledge of the boundary is assumed. We then introduce an optimization method to identify $\lambda$ and $\mu$, using in particular a $H^1$-type regularization of the gradient. We lastly show some numerical results in two dimensions, including a study of the impact of some various parameters, and by assuming either an exact knowledge of the shape of the obstacle or an approximate one.
Document type :
Reports (Research report)
Domain :

Cited literature [20 references]

https://hal.inria.fr/inria-00534042
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Submitted on : Monday, November 8, 2010 - 5:08:55 PM
Last modification on : Wednesday, October 26, 2022 - 8:16:26 AM
Long-term archiving on: : Friday, December 2, 2016 - 12:04:44 PM

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RR-7449.pdf
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• HAL Id : inria-00534042, version 2

### Citation

Laurent Bourgeois, Nicolas Chaulet, Houssem Haddar. Identification of generalized impedance boundary conditions: some numerical issues. [Research Report] RR-7449, INRIA. 2010, pp.30. ⟨inria-00534042v2⟩

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