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Analysis of a hybrid noise control system for a duct

Munjal, ML and Eriksson, LJ (1989) Analysis of a hybrid noise control system for a duct. In: Journal of the Acoustical Society of America, 86 (2). pp. 832-834.

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This letter proposes the combination of a passive muffler and an active noise control system for the control of very high‐level noise in ducts used with large industrial fans and similar equipment. The analysis of such a hybrid system is presented making use of electroacoustic analogies and the transfer matrix method. It turns out that a passive muffler upstream of the input microphone can indeed lower the acoustic pressure and, hence, the power requirement of the auxiliary source. The parameter that needs to be optimized (or maximized) for this purpose is a certain velocity ratio that can readily be evaluated in a closed form, making it more or less straightforward to synthesize the configuration of an effective passive muffler to go with the active noise control system.

Item Type: Editorials/Short Communications
Publication: Journal of the Acoustical Society of America
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 16 Dec 2011 06:22
Last Modified: 16 Dec 2011 06:22
URI: http://eprints.iisc.ac.in/id/eprint/42753

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