Actively enhanced porous layers for free-field acoustic absorption

Marc Furstoss; Denis Thenail; Marie-Annick Galland

doi:10.1117/12.237046

26 April 1996 Actively enhanced porous layers for free-field acoustic absorption

Marc Furstoss, Denis Thenail, Marie-Annick Galland

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Proceedings Volume 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials; (1996) https://doi.org/10.1117/12.237046
Event: 3rd International Conference on Intelligent Materials, 1996, Lyon, France

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.

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Marc Furstoss, Denis Thenail, and Marie-Annick Galland "Actively enhanced porous layers for free-field acoustic absorption", Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996); https://doi.org/10.1117/12.237046

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