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Type: Conference paper
Title: An adaptive chimney stack for noise control
Author: Kidner, M.
Cazzolato, B.
Citation: Acoustics 2005 : acoustics in a changing environment : proceedings of the Annual Conference of the Australian Acoustical Society / Terrance McMinn (ed.): pp. 159-163
Publisher: Australian Acoustical Society (Western Australian division)
Publisher Place: CD ROM
Issue Date: 2005
ISBN: 090988224X
Conference Name: Australian Acoustical Society. Conference (2005 : Busselton, W.A.)
Editor: McMinn, T.
Statement of
M. R. F. Kidner, B. S. Cazzalato
Abstract: Radiation of noise from exhaust stacks is a significant source of community disturbance. In this paper an exhaust stack with an adaptive length is proposed. The effective length of the stack is changed by altering the level of water in a sump at the base of the stack, this level is controlled as a function of the radiated noise from the top of the stack. The system is modelled as a pipe with an adaptive side branch. A gradient descent algorithm is used to minimise the radiated sound. The response to a step change in frequency and a chirp signal is shown. A simple heuristic controller is compared to the performance obtained with the gradient descent algorithm and is shown to be acceptable and computationally simpler.
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Appears in Collections:Aurora harvest 2
Environment Institute publications
Mechanical Engineering conference papers

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