Skip to Main content Skip to Navigation
Theses

Modélisation et simulation multi-échelle et multi-physique du comportement acoustique de milieux poroélastiques : application aux mousses de faible densité

Abstract : This work aims at determining the acoustical properties of poro-elastic media through a multi-scale method. Some imaging techniques (tomography and micrographs) allow to estimate some quantitative microstructure properties of foams containing open or partially closed cells. These properties are used in order to clarify the features of a representative three-dimensional unit cell of a periodic structure, which mimics the behaviour of the real foam. All parameters controlling the acoustical properties of the porous foam are obtained by using the homogenization of periodic structures. In a first step, the structure of the foam is assumed to be rigid. It was shown that, in the case of a narrow distribution of the characteristic size of the local geometry, a direct computation of the macroscopic behaviour from the local geometrical properties is consistent with the measured acoustical properties. For a wide distribution of pore size, the acoustical behaviour is controlled by critical sizes that are obtained from porosity and static permeability for an open-cell foam, while for partially closed cells, the identification of a complementary characteristic dimension within the pores becomes necessary (e.g. closure rate of membranes). Our results compare well with data obtained from an impedance tube set-up. In a second step, effective elastic properties are computed through a modelling of the foam structure by finite elements. The computed elastic parameters are finally compared with data coming from the literature and with results of mechanical tests
Document type :
Theses
Complete list of metadatas

Cited literature [146 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00799779
Contributor : Abes Star :  Contact
Submitted on : Tuesday, April 9, 2013 - 9:22:38 AM
Last modification on : Friday, October 23, 2020 - 5:02:18 PM
Long-term archiving on: : Monday, April 3, 2017 - 2:27:15 AM

File

TH2012PEST1136_complete.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00799779, version 3

Collections

Citation

Minh Tan Hoang. Modélisation et simulation multi-échelle et multi-physique du comportement acoustique de milieux poroélastiques : application aux mousses de faible densité. Autre. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1136⟩. ⟨tel-00799779v3⟩

Share

Metrics

Record views

1176

Files downloads

775