Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6633
Title: Narrow sidebranch arrays for low frequency duct noise control
Authors: Tang, SK 
Issue Date: Nov-2012
Source: Journal of the Acoustical Society of America, Nov. 2012, v. 132, no. 5, p. 3086–3097
Abstract: The present study investigates the sound transmission loss across a section of an infinitely long duct where one or more narrow sidebranch tubes are installed flushed with the duct wall. The finite-element method is used to compute the wave propagation characteristics, and a simplified theoretical analysis is carried out at the same time to explain the wave mechanism at frequencies of high sound reduction. Results show that the high sound transmission loss at a particular frequency is due to the concerted actions of three consecutive sidebranch tubes with the most upstream one in the resonant state. The expansion chamber effect of the setup also plays a role in enhancing soundattenuation at non-resonance frequencies. Broadband performance of the device can be greatly enhanced by appropriate arrangements of tube lengths and/or by coupling arrays on the two sides of the duct.
Keywords: Finite element method
Tubes (components)
Publisher: Acoustical Society of America
Journal: Journal of the Acoustical Society of America 
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4756951
Rights: Copyright 2012 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
The following article appeared in Tang, S. K. (2012). Narrow sidebranch arrays for low frequency duct noise control. Journal of the Acoustical Society of America, 132(5), 3086-3097 and may be found at http://scitation.aip.org/content/asa/journal/jasa/132/5/10.1121/1.4756951.
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