Acoustical scattering identification with local impedance through a spectral approach

Mohamed Amine Ben Souf; Ahmed Kessentini; Olivier Bareille; Mohamed Taktak; Mohamed N. Ichchou; Mohamed Haddar

doi:10.1016/j.crme.2017.03.006

Acoustical scattering identification with local impedance through a spectral approach

Mohamed Amine Ben Souf ^1,² ; Ahmed Kessentini ^1,²; Olivier Bareille ²; Mohamed Taktak ¹; Mohamed N. Ichchou ²; Mohamed Haddar ¹

¹ Mechanics, Modelling and Production Laboratory (LA2MP), National School of Engineers of Sfax, University of Sfax, BP 1173, Sfax 3038, Tunisia
² Laboratoire de tribologie et dynamique des systèmes (LTDS), École centrale de Lyon, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France

Comptes Rendus. Mécanique, Volume 345 (2017) no. 5, pp. 301-316.

Abstract

Acoustical scattering in waveguides is studied in this paper. The Wave Finite Element (WFE) approach is mainly used, since it allows the reduction of problems dealing with periodic waveguides. The paper deals with guided acoustical propagation, that is, propagation in a main direction is privileged. The scattering by a locally reacting lining is first studied. The liner can be characterised by its local impedance in this case. The equivalent surface impedance is therefore calculated. Then, scattering by a porous layer is considered. A full three-dimensional modelling of the lining is preferred since porous materials are bulk reacting. The scattering matrix of the lined part is computed, and acoustical scattering of high-order modes and conversion between modes are highlighted. The acoustic power attenuation is further evaluated. The response of ducts subjected to constraining boundary conditions is also calculated. Numerical results are presented and compared to those obtained with conventional approaches.

Received: 2016-10-24
Accepted: 2017-03-18
Published online: 2017-04-14

DOI: 10.1016/j.crme.2017.03.006

Mots-clés : Wave finite element, Acoustical propagation, Micro-perforated plate, Locally reacting lining, Scattering

Author's affiliations:

Mohamed Amine Ben Souf ^{1, 2}; Ahmed Kessentini ^{1, 2}; Olivier Bareille ²; Mohamed Taktak ¹; Mohamed N. Ichchou ²; Mohamed Haddar ¹

¹ Mechanics, Modelling and Production Laboratory (LA2MP), National School of Engineers of Sfax, University of Sfax, BP 1173, Sfax 3038, Tunisia
² Laboratoire de tribologie et dynamique des systèmes (LTDS), École centrale de Lyon, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France

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     author = {Mohamed Amine Ben Souf and Ahmed Kessentini and Olivier Bareille and Mohamed Taktak and Mohamed N. Ichchou and Mohamed Haddar},
     title = {Acoustical scattering identification with local impedance through a spectral approach},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {301--316},
     publisher = {Elsevier},
     volume = {345},
     number = {5},
     year = {2017},
     doi = {10.1016/j.crme.2017.03.006},
     language = {en},
}

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Mohamed Amine Ben Souf; Ahmed Kessentini; Olivier Bareille; Mohamed Taktak; Mohamed N. Ichchou; Mohamed Haddar. Acoustical scattering identification with local impedance through a spectral approach. Comptes Rendus. Mécanique, Volume 345 (2017) no. 5, pp. 301-316. doi : 10.1016/j.crme.2017.03.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.03.006/

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