Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15655
Title: A theoretical study of passive control of duct noise using panels of varying compliance
Authors: Huang, L
Issue Date: 2001
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2001, v. 109, no. 6, p. 2805-2814 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: It is theoretically demonstrated that, in a duct, a substantial amount of sound energy can be transferred to flexural waves on a finite wall panel when the upstream portion of the panel is made to couple strongly with sound. The flexural wave then loses its energy either through radiating reflection sound waves or by internal friction. The effectiveness of the energy transfer and damping is greatly enhanced if the panel has a gradually decreasing in vacuo wave speed, which, in this study, is achieved by using a tapered membrane under tension. A high noise attenuation rate is possible with the usual viscoelastic materials such as rubber. The transmission loss has a broadband spectrum, and it offers an alternative to conventional duct lining where a smooth air passage is desired and nonacoustical considerations, such as chemical contamination or cost of operation maintenance, are important. Another advantage of the tapered panel is that, at very low frequencies, typically 5% of the first cut-on frequency of the duct, sound reflection occurs over the entire panel length. This supplements the inevitable drop in sound absorption coefficient, and a high transmission loss may still be obtained at very low frequencies.
URI: http://hdl.handle.net/10397/15655
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.1369108
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