Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/35419
Type: Conference paper
Title: The elusive cost function for tuning adaptive Helmholtz resonators
Author: Singh, S.
Hansen, C.
Howard, C.
Citation: Proceedings, Australian Acoustical Society, New Zealand Acoustical Society : First Australasian Acoustical Societies' Conference : Acoustics 2006 : noise of progress, Clearwater Resort, Christchurch, New Zealand, 20-22 November 2006 / Terrance McMinn (ed.): pp. 75-82
Publisher: New Zealand Acoustical Society
Publisher Place: New Zealand
Issue Date: 2006
ISBN: 9780958758383
Conference Name: Australasian Acoustical Societies' Conference (1st : 2006 : Christchurch, New Zealand)
Editor: Terrance McMinn,
Statement of
Responsibility: 
Sarabjeet Singh, Colin H. Hansen and Carl Q. Howard
Abstract: One of the problems associated with the use of Helmholtz resonators to control tonal noise propagation inside a pipe or duct is that any slight frequency changes in the tonal noise as a result of environmental changes or load changes on the device generating the noise will severely compromise the performance of the resonator. Thus, it is desirable to use an adaptive resonator whose volume or neck length can be adjusted to maintain optimal tuning as the excitation frequency or environmental conditions change. The ideal cost function would be a measure of the sound power propagating down the duct so the control system could minimise this quantity by driving motors that change the geometry of resonator. In practice, it is highly desirable to have available a self-contained adaptive resonator that does not need any external inputs or measures of quantities outside the resonator package. A cost function based on pressure measurements in the resonator, which corresponds to sound power in the duct has been found and verified experimentally and numerically. The effect of resonator damping on the cost function and a method to correct for the effect is also discussed. Copyright © (2006) by the Australian Acoustical Society.
Appears in Collections:Aurora harvest
Environment Institute publications
Mechanical Engineering conference papers

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