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Open Access item Low frequency absorption by active control of impedance

Authors:Cobo, Pedro
Pfretzschner, Jaime
Cuesta, María
Fernández, Alejandro
Keywords:Acoustic absorption, Low frequency range, Hybrid passive-active system, Broadband absorption
Issue Date:Sep-2004
Publisher:Sociedade Portuguesa de Acústica
Citation:XXXV Congreso Español de Acústica – TecniAcústica 2004. Metrological and experimental acoustics; ID23
Abstract:Passive systems are inherently unable to provide absorption in the low frequency range due to limitations in the size-to-wavelength ratio. Active control systems, on the other hand, perform at low frequencies. A hybrid passive-active system can then be conceived which complements the low frequency range of a passive absorber with active control. When properly configured, such a hybrid system is able to afford broadband absorption.
Description:8 pages, 5 figures.-- Comunicación presentada en: XXXV Congreso Español de Acústica – TecniAcústica 2004, IV Congreso Iberoamericano de Acústica, IV Congreso Ibérico de Acústica y EAA Symposium "Environmental and Architectural Acoustics" (Guimaraes, 14-17 Sep 2004).
Appears in Collections:(IA) Comunicaciones congresos

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