Influence of Porosity, Fiber Radius and Fiber Orientation on the Transport and Acoustic Properties of Random Fiber Structures

Abstract : The ability of air-saturated fibrous media to mitigate sound wavesiscontrolled by their transport properties that are themselves controlled by the geometrical characteristics of their microstructure such as the open porosity,fiber radius, and fiber orientation. Here, micro-macro relationships are proposed to link these microstructural features to the macroscopic transport properties of random fiber structures. These transport properties are the tortuosity, the viscous and thermal static permeabilities, and the viscous and thermal characteristic lengths. First, representative elementary volumes (REVs)ofrandom fiber structures are generated for different triplets of porosity,fiber radius and fiber orientation. The fibers are allowed to overlap and are motionless (rigid-frame assumption). The fiber orientation is derivedf rom as econd order orientation tensor.S econd, the transport equations are numerically solved on the REVs which are seen as periodic unit cells. These solutions yield the transport properties governing the sound propagation and dissipation in the respective fibrous media. From these solutions, micro-macro relationships are derivedt oe stimate the transport properties when the geometry of the fiber structure is known. Finally,these relationships are used to study the influence of the microstructural features on the acoustic properties of random fiber structures.
Type de document :
Article dans une revue
Acta Acustica united with Acustica, Hirzel Verlag, 2017, 103 (6), pp.1050 - 1063. 〈10.3813/AAA.919134〉
Liste complète des métadonnées

Littérature citée [30 références]  Voir  Masquer  Télécharger

https://hal-upec-upem.archives-ouvertes.fr/hal-01663790
Contributeur : Camille Perrot <>
Soumis le : lundi 18 décembre 2017 - 15:40:33
Dernière modification le : jeudi 11 janvier 2018 - 06:22:28

Fichier

Luu_et_al_2017(b).pdf
Publication financée par une institution

Identifiants

Collections

Citation

Hoang Tuan Luu, Camille Perrot, Raymond Panneton. Influence of Porosity, Fiber Radius and Fiber Orientation on the Transport and Acoustic Properties of Random Fiber Structures. Acta Acustica united with Acustica, Hirzel Verlag, 2017, 103 (6), pp.1050 - 1063. 〈10.3813/AAA.919134〉. 〈hal-01663790〉

Partager

Métriques

Consultations de la notice

62

Téléchargements de fichiers

39