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Title: Development of software for predicting the acoustic attenuation performance of expansion chambers in duct systems
Authors: Yan, X
Mak, CM 
Issue Date: 2006
Source: Architectural science review, 2006, v. 49, no. 3, p. 258-262
Abstract: Noise produced by air duct distribution systems in buildings is always a nuisance to occupants. The expansion chamber is one of major items used by engineers to alleviate duct-borne noise problems. Numerical techniques such as the Boundary Element Method (BEM) are commonly used to predict the performance of mufflers used in duct distribution systems in terms of Transmission Loss (TL). In this paper, computer software based on a 2-dimensional BEM and a 3-point method is developed for calculating the TL of a simple axisymmetric expansion chamber muffler. Computed values of the TL obtained by the software arc compared with published experimental data. The effect of the length of the chamber on its acoustic attenuation performance is shown.
Keywords: Acoustic attenuation
Acoustic performance
Building services engineering
Duct systems
Expansion chamber
Publisher: Taylor & Francis
Journal: Architectural science review 
ISSN: 0003-8628
EISSN: 1758-9622
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