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Theses

Prédiction des propriétés acoustiques de matériaux fibreux hétérogènes à partir de leur microstructure 3D

Abstract : This PhD thesis is carried out in the framework of the Silent Wall research program whose main objective consists of designing an acoustic and thermal insulating system for buildings, from fibrous materials. Since the acoustic insulation is the main issue of this work, several fields of research are prospected within the study of the microstructural properties of these media. The Thermisorel material, made of wooden fibres, is a reference fibrous medium for the Silent Wall project thanks to its good acoustic and thermal insulating properties. Volumic 3D X-Ray microtomographic images of this material are analyzed by mathematical morphology in order to characterize the microstructures of its fibrous and porous phases. A 3D Boolean model of random cylinders is proposed to simulate such a fibrous medium. Since the morphological measurements processed on real and simulated media are quite similar, this morphological model is validated. Finally, the thermo-acoustic properties of microscopic elementary periodic cells of simplified media, composed of parallel fibres, are estimated by the finite element method. The objective of this modelling is to link the coefficient of acoustic absorption to the radii of the fibres and to the thickness of the material. The absorption coefficient of the simulated fibrous media are similar to the experimental measurements made on Thermisorel. Therefore, our global method to characterize, and to model the morphology and the thermo-acoustic properties of fibrous media at the microscopic scale, is validated by the morphological and acoustic properties of wooden panels of Thermisorel, and is helpful for future optimisations of the acoustic performances of fibrous materials by modifying their microstructures.
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https://pastel.archives-ouvertes.fr/pastel-00568918
Contributor : Charles Peyrega <>
Submitted on : Wednesday, February 23, 2011 - 8:52:21 PM
Last modification on : Friday, October 23, 2020 - 4:48:05 PM
Long-term archiving on: : Tuesday, May 24, 2011 - 3:34:39 AM

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  • HAL Id : pastel-00568918, version 1

Citation

Charles Peyrega. Prédiction des propriétés acoustiques de matériaux fibreux hétérogènes à partir de leur microstructure 3D. Traitement du signal et de l'image [eess.SP]. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0042⟩. ⟨pastel-00568918⟩

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