On the use of periodic inclusions embedded in porous lining to enhanced attenuation in waveguides - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

On the use of periodic inclusions embedded in porous lining to enhanced attenuation in waveguides

Benoit Nennig
Connectez-vous pour contacter l'auteur
Ygäal Renou
  • Fonction : Auteur
  • PersonId : 939087

Résumé

Acoustic liners are often used to limit noise propagation in acoustic waveguides with a grazing flow such as ventilation, exhaust or aircraft engine. Standard liners are most often made of perforated plate backed by honey comb or with porous material. The aim of this work is to study the influence of a set of periodic rigid inclusions embedded in a porous lining to enhanced attenuation. Only an elementary cell of this periodic waveguide is studied using the Bloch waves formalism. This yields a quadratic eigenvalue problem involving the Bloch wavenumber solved with the finite element method. However these configurations require to investigate parameters often omitted in academic lattice studies: (i) Dissipation; (ii) higher modes interaction; (iii) mean flow convection effect. These absorbing concepts as well as the computational approach are validated with experimental data and with analytical solution on simple configurations. The influence of the inclusion shape, waveguide dimension and the mean flow impact are illustrated on various examples.
Fichier principal
Vignette du fichier
hal-00810614.pdf (373.17 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00810614 , version 1 (23-04-2012)

Identifiants

  • HAL Id : hal-00810614 , version 1

Citer

Benoit Nennig, Ygäal Renou, Yves Aurégan. On the use of periodic inclusions embedded in porous lining to enhanced attenuation in waveguides. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810614⟩
132 Consultations
144 Téléchargements

Partager

Gmail Facebook X LinkedIn More