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2. Metrology of the acoustic properties of absorbent materials
2.1 Physical parameters and acoustic properties
In paragraph 1 , an asymptotic study at low and high frequencies highlighted the importance of a number of parameters characteristic of the internal geometry of a porous material. Models for predicting the acoustic behavior of...
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Metrology of the acoustic properties of absorbent materials
Low-frequency ultrasonic characterization of porous materials
Appendix: equivalent fluid
The "effective density" and "effective modulus of compressibility" functions of the equivalent fluid must be suitably represented by the following approximate models:
References
Standardization
French Standards Association (Afnor)
- Fiberboard – Determining surface absorption – 2: test methods for hardboard. - NF EN 382-2 - (03-1994)
- Acoustics – Materials for acoustic applications – Determination of air flow resistance. - NF EN 29053 - (08-1993)
- Thermal performance of buildings – Air permeability of...
Organizations
Laboratoire d'acoustique de l'Université du Maine http://laum.univ-lemans.fr
Centre de transfert de technologie du Mans (CTTM) http://www.cttm-lemans.com
Laboratoire de sciences de l'habitat (LASH). École nationale des travaux publics...
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