Active control of buzz-saw tones: experimental results from a laboratory - scale rig
Active control of buzz-saw tones: experimental results from a laboratory - scale rig
This paper details the results of an experiment on a small scale no-flow rig to control a spinning mode with similar characteristics to the modes generated by buzz-saw noise. The spinning mode (m = -3, n = 1) is generate by a mode synthesiser ring which has similar characteristics to that of a low frequency Buzz-saw mode. A control system using seven microphones an seven control actuators is used to minimise the sum of the squared pressure at the duct wall using a Filtered reference Least Mean Squares (FXLMS algorithm). It is shown that at certain frequencies the sound power transmitted to the duct termination is reduced by 14.5dB. The control mechanism at different frequency ranges are identified and discussed with reference to computer simulations. It is shown that cut-off modes excited by the secondary actuator array have a significant effect on control performance a frequencies close to the cut-on frequency of the (m = -4, n = 1) mode.
Wilkinson, M.J.
6c1b6e22-9111-404b-b36d-0f7a815ee226
Joseph, P.F.
49d48c71-47fb-49e7-b15b-bb1a78e39139
2005
Wilkinson, M.J.
6c1b6e22-9111-404b-b36d-0f7a815ee226
Joseph, P.F.
49d48c71-47fb-49e7-b15b-bb1a78e39139
Wilkinson, M.J. and Joseph, P.F.
(2005)
Active control of buzz-saw tones: experimental results from a laboratory - scale rig.
11th AIAA/CEAS Aeroacoustics Conference, Monterey, California, USA, 23-25 May 2005, Monterey, California.
23 - 25 May 2005.
16 pp
.
(doi:10.2514/6.2005-3074).
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Conference or Workshop Item
(Paper)
Abstract
This paper details the results of an experiment on a small scale no-flow rig to control a spinning mode with similar characteristics to the modes generated by buzz-saw noise. The spinning mode (m = -3, n = 1) is generate by a mode synthesiser ring which has similar characteristics to that of a low frequency Buzz-saw mode. A control system using seven microphones an seven control actuators is used to minimise the sum of the squared pressure at the duct wall using a Filtered reference Least Mean Squares (FXLMS algorithm). It is shown that at certain frequencies the sound power transmitted to the duct termination is reduced by 14.5dB. The control mechanism at different frequency ranges are identified and discussed with reference to computer simulations. It is shown that cut-off modes excited by the secondary actuator array have a significant effect on control performance a frequencies close to the cut-on frequency of the (m = -4, n = 1) mode.
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Published date: 2005
Additional Information:
AIAA 2005-3074
Venue - Dates:
11th AIAA/CEAS Aeroacoustics Conference, Monterey, California, USA, 23-25 May 2005, Monterey, California, 2005-05-23 - 2005-05-25
Identifiers
Local EPrints ID: 28382
URI: http://eprints.soton.ac.uk/id/eprint/28382
PURE UUID: 29612fc9-d670-44e8-93e8-a795c1c54bc6
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Date deposited: 02 May 2006
Last modified: 15 Mar 2024 07:24
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Contributors
Author:
M.J. Wilkinson
Author:
P.F. Joseph
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