1060 Rue Cherbourg, Sherbrooke, J1K2N8, Canada

(819) 346-5666 info@mecanum.com

Workshops

Celya Course

Acoustics of porous materials:  Experimental techniques

Raymond Panneton
DOI: 10.13140/RG.2.1.2788.5845
200 pages
12-14 February 2013
CELYA Winter School on the Acoustics of Poro-Visco-Elastic Media
Centre Lyonnais d’Acoustique, Université de Lyon
Lyon (France)

[Download]

Description

Open-cell porous materials are used for soundproofing and noise control. Engineers simulate their performance in different applications using state-of-the-art prediction software. To define these materials, up to ten (10) material properties are required following the Biot-Allard poroelasticity model. There are 6 non-acoustical parameters (open porosity, static airflow resistivity, tortuosity, viscous and thermal characteristic lengths, static thermal permeability), 1 physical property (in-vacuum bulk density) and 3 viscoelastic properties (Young’s modulus, Poisson’s ratio, damping loss factor). This workshop is on the experimental techniques and good practices to accurately characterize the porous material properties


Noise control materials: Characterization and modeling

Noureddine Atalla, Raymond Panneton
128 pages
19-22 August 2012
ASME NCAD Workshop on noise control materials
Internoise 2012
New York (USA)

[Download]

Description

Part I of this workshop addresses the analytical and numerical modeling of multilayered panels made up from different materials, notably open-cell porous materials.  Also, many acoustic treatments are modeled, and their predictions compared to experimental measurements under normal incidence and diffuse field measurements.

Part II addresses the characterization of noise control treatments, and most particularly the porous materials.  Direct and inverse measurement methods are presented, and the main challenges of the characterization of real material samples discussed.  Also, the material parameters of a numbers of materials are characterized, and their accuracy validated.