Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20946
Title: A prediction method for aerodynamic sound produced by multiple elements in air ducts
Authors: Mak, CM 
Issue Date: 2005
Publisher: Academic Press
Source: Journal of sound and vibration, 2005, v. 287, no. 1-2, p. 395-403 How to cite?
Journal: Journal of sound and vibration 
Abstract: A prediction method for aerodynamic sound produced by the interaction of multiple elements in a low speed flow duct has been developed. Same as the previous works of Mak and Yang for two in-duct elements, the concept of partially coherent sound fields is adopted to formulate the sound powers produced by interaction of multiple in-duct elements at frequencies below and above the cut-on frequency of the lowest transverse duct mode. An interaction factor is finally defined as a result of a simple relationship between the sound power due to the interaction of multiple in-duct elements and that due to a single in-duct element. The present study suggests that it is possible to predict the level and spectral distribution of the additional acoustic energy produced by the interaction of multiple in-duct elements. The proposed method therefore can form a basis of a generalized prediction method for aerodynamic sound produced by multiple in-duct elements in a ventilation system.
URI: http://hdl.handle.net/10397/20946
ISSN: 0022-460X
EISSN: 1095-8568
DOI: 10.1016/j.jsv.2005.01.048
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