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Matériaux poreux acoustiques - SFA

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Introduction Applications R&D Applications Bâtiments Applications Industrielles Discussion<br />

Validations expérimentales<br />

Champ diffus acoustique, mesures selon ISO 354<br />

Sound absorption coefficient α<br />

1<br />

0.9<br />

0.8<br />

0.7<br />

0.6<br />

0.5<br />

0.4<br />

0.3<br />

0.2<br />

0.1<br />

Perf. circulaires irrégulières φ p =9%<br />

Measurements<br />

Simple porosity model<br />

Double porosity model<br />

0<br />

0 1000 2000 3000 4000 5000<br />

Frequency (Hz)<br />

MATELYS−AcV / ENTPE−DGCB<br />

bonne correspondance à toutes les fréquences, pour différentes formes de perforations<br />

) Modèle analytique, échantillons testés =46 mm<br />

F.-X. Bécot – fxb@matelys.com – http://www.matelys.com Journées d’étude Poreux, 14-15 Mai 2009 : 19

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