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Proceedings Paper

Actively enhanced porous layers for free-field acoustic absorption
Author(s): Marc Furstoss; Denis Thenail; Marie-Annick Galland
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Paper Abstract

An active system which improves the absorbent properties of a porous material sample in free field is presented. The method, which is based on the `(lambda) /4 resonance absorber' principle, associated active and passive means: a pressure minimization is achieved at the rear face of a porous layer to realize an impedance matching between its surface and the acoustic incident waves. The performances of a system including a single secondary loudspeaker, then a 3 X 3 array, are presented under normal and oblique incidence, for low frequencies under 1000 Hz.

Paper Details

Date Published: 26 April 1996
PDF: 6 pages
Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996); doi: 10.1117/12.237046
Show Author Affiliations
Marc Furstoss, Ecole Centrale de Lyon/CNRS (France)
Denis Thenail, Ecole Centrale de Lyon/CNRS (France)
Marie-Annick Galland, Ecole Centrale de Lyon/CNRS (France)


Published in SPIE Proceedings Vol. 2779:
3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials
Pierre Francois Gobin; Jacques Tatibouet, Editor(s)

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