A model based approach for estimating the strength of acoustic sources within a circular duct
A model based approach for estimating the strength of acoustic sources within a circular duct
This paper describes a possible experimental technique for the investigation of the characteristics of acoustic sources within a circular duct. It would be extremely beneficial for noise control design purposes to have information regarding the separate amplitude and phase of each source component which constitutes a complex radiating volume. Unfortunately this is not possible to achieve by measurement of the radiated pressure alone, since this will only yield information about the acoustic field radiated by the whole source volume, which itself is a convolution of the strength of each source element with the response of the surrounding duct. A technique is presented here which uses a model based approach to determine the best estimate of the complex source strength using measurements of the acoustic pressure within the duct. Results are presented which show that the technique has some potential as a measurement technique. As a simple means of examining some important parameters which influence the quality of the source strength estimate, the technique is applied to the case of a point monopole source within a hard walled duct.
Hewlett, D. A.K.
6995d0d5-1936-478a-9378-5969af730f66
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
22 August 2012
Hewlett, D. A.K.
6995d0d5-1936-478a-9378-5969af730f66
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Hewlett, D. A.K. and Nelson, P. A.
(2012)
A model based approach for estimating the strength of acoustic sources within a circular duct.
2nd AIAA/CEAS Aeroacoustics Conference, 1996, , State College, United States.
06 - 08 May 1996.
(doi:10.2514/6.1996-1766).
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(Paper)
Abstract
This paper describes a possible experimental technique for the investigation of the characteristics of acoustic sources within a circular duct. It would be extremely beneficial for noise control design purposes to have information regarding the separate amplitude and phase of each source component which constitutes a complex radiating volume. Unfortunately this is not possible to achieve by measurement of the radiated pressure alone, since this will only yield information about the acoustic field radiated by the whole source volume, which itself is a convolution of the strength of each source element with the response of the surrounding duct. A technique is presented here which uses a model based approach to determine the best estimate of the complex source strength using measurements of the acoustic pressure within the duct. Results are presented which show that the technique has some potential as a measurement technique. As a simple means of examining some important parameters which influence the quality of the source strength estimate, the technique is applied to the case of a point monopole source within a hard walled duct.
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Published date: 22 August 2012
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Publisher Copyright:
© 1996, American Institute of Aeronautics and Astronautics, Inc.
AIAA Meeting papers on Disc, May 1996 A9630876, AIAA paper 96-1766
Venue - Dates:
2nd AIAA/CEAS Aeroacoustics Conference, 1996, , State College, United States, 1996-05-06 - 1996-05-08
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Local EPrints ID: 467714
URI: http://eprints.soton.ac.uk/id/eprint/467714
PURE UUID: b54b3db8-8616-4314-b2d2-5f37aa66a06c
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Date deposited: 19 Jul 2022 17:21
Last modified: 17 Mar 2024 02:32
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Author:
D. A.K. Hewlett
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