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Title: Noise suppression of a dipole source by tensioned membrane with side-branch cavities
Authors: Liu, Y
Choy, YS 
Huang, L
Cheng, L 
Issue Date: Sep-2012
Source: Journal of the Acoustical Society of America, Sept. 2012, v. 132, no. 3, p. 1392-1402
Abstract: Reducing the ducted-fan noise at the low frequency range remains a big technical challenge. This study presents a passive approach to directly suppress the dipole sound radiation from an axial-flow fan housed by a tensioned membrane with cavity backing. The method aims at achieving control of low frequency noise with an appreciable bandwidth. The use of the membrane not only eliminates the aerodynamic loss of flow, but also provides flexibility in controlling the range of the stopband with high insertion loss by varying its tension and mass. A three-dimensional model is presented which allows the performance of the proposed device to be explored analytically. With the proper design, this device can achieve a noise reduction of 5 dB higher than the empty expansion cavity recently proposed by Huang et al. [J. Acoust. Soc. Am. 128, 152–163 (2010)]. Through the detailed modal analysis, even in vacuo modes of the membrane vibration are found to play an important role in the suppression of sound radiation from the dipole source. Experimental validation is conducted with a loudspeaker as the dipole source and good agreement between the predicted and measured insertion loss is achieved.
Keywords: Acoustic generators
Acoustic properties
Acoustic wave propagation
Acoustic wave scattering
Modal analysis
Publisher: Acoustical Society of America
Journal: Journal of the Acoustical Society of America 
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4739448
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 Liu, Y., Choy, Y. S., Huang, L., & Cheng, L. (2012). Noise suppression of a dipole source by tensioned membrane with side-branch cavities. Journal of the Acoustical Society of America, 132(3), 1392-1402, and may be found at
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