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Title: The influence of baffle fairings on the acoustic performance of rectangular splitter silencers
Authors: Kirby, R
Keywords: Dissipative silencer;Air conditioning silencer;Baffle fairings;Splitter silencer;HVAC silencer;Silencer insertion loss
Issue Date: 2005
Publisher: American Institute of Physics
Citation: Journal of the Acoustical Society of America 118 (4): 2302-2312, Oct 2005
Abstract: A numerical model based on the finite element method is developed for a finite length, HVAC splitter silencer. The model includes an arbitrary number of bulk-reacting splitters separated from the airway by a thin perforated metal sheet and accommodates higher order modes in the incident sound field. Each perforated sheet is joined to rigid, impervious, metallic fairing situated at either end of a splitter. The transmission loss for the silencer is quantified by application of the point collocation technique, and predictions are compared to experimental measurements reported in the literature. The splitter fairing is shown to significantly affect silencer performance, especially when higher order incident modes are present. It is concluded that laboratory measurements, and theoretical predictions, that are based on a predominantly plane wave sound source are unlikely to reflect accurately the true performance of an HVAC silencer in a real ducting system.
ISSN: 0001-4966
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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