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Title: On tuning a reactive silencer by varying the position of an internal membrane
Authors: Lawrie, JB
Guled, IMM
Keywords: Reactive silencer;Membrane boundary;Non-standard orthogonality relation;Mode-matching method;HVAC ducts
Issue Date: 2006
Publisher: Acoustical Society of America
Citation: The Journal of the Acoustical Society of America. 120 (2) 780–790.
Abstract: A mode-matching method is used to investigate the performance of a two-dimensional, modified reactive silencer. The modification takes the form of a membrane which is attached to the internal walls of the expansion chamber parallel to the axis of the inlet/outlet ducts. The height of the membrane above the level of the inlet/outlet ducts can be varied and, by this means, the device is tuned. It is shown that the stopband produced by the silencer can be broadened and/or shifted depending upon the height to which the membrane is raised. Attention is focused on the efficiency of the device at low-frequencies - the regime where dissipative silencers are usually least effective. The potential use of the device as a component in a hybrid silencer for heating ventilation and air-conditioning (HVAC) ducting systems is discussed.
Appears in Collections:Publications
Dept of Mathematics Research Papers
Mathematical Sciences

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