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Low frequency absorption by active control of impedance

AuthorsCobo, Pedro; Pfretzschner, Jaime; Cuesta, María; Fernández, Alejandro
KeywordsAcoustic absorption
Low frequency range
Hybrid passive-active system
Broadband absorption
Issue DateSep-2004
PublisherSociedade Portuguesa de Acústica
CitationXXXV Congreso Español de Acústica – TecniAcústica 2004. Metrological and experimental acoustics; ID23
AbstractPassive 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.
Description8 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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