Active techniques and their potential for application in aeroacoustics
Active techniques and their potential for application in aeroacoustics
A brief review is presented of the application of active techniques to problems in acroacoustics. Emphasis is given to the basic physical limitations of active techniques in controlling both noise radiated into the interior of aircraft and to noise radiated by aircraft to the surrounding atmosphere. The possibilities for the control of fan noise generated at harmonics of blade passage frequency are addressed, together with the use of optimally designed in-duct sensor arrays for the prediction of far field radiation from in-duct measurements. A discussion is also presented of techniques for the control of boundary layer flows and the possible consequences for the control of broadband noise generated by flow over lifting surfaces. Finally, a preliminary theoretical analysis is outlined which enables an estimate to be made of the potential for the use of flow control techniques in contributing to the reduction of fan tonal noise, the latter often being associated with inlet flow distortions.
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
2000
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Nelson, P. A.
(2000)
Active techniques and their potential for application in aeroacoustics.
6th Aeroacoustics Conference and Exhibit, 2000, , Lahaina, HI, United States.
12 - 14 Jun 2000.
(doi:10.2514/6.2000-2100).
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Conference or Workshop Item
(Paper)
Abstract
A brief review is presented of the application of active techniques to problems in acroacoustics. Emphasis is given to the basic physical limitations of active techniques in controlling both noise radiated into the interior of aircraft and to noise radiated by aircraft to the surrounding atmosphere. The possibilities for the control of fan noise generated at harmonics of blade passage frequency are addressed, together with the use of optimally designed in-duct sensor arrays for the prediction of far field radiation from in-duct measurements. A discussion is also presented of techniques for the control of boundary layer flows and the possible consequences for the control of broadband noise generated by flow over lifting surfaces. Finally, a preliminary theoretical analysis is outlined which enables an estimate to be made of the potential for the use of flow control techniques in contributing to the reduction of fan tonal noise, the latter often being associated with inlet flow distortions.
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Published date: 2000
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Copyright 2020 Elsevier B.V., All rights reserved.
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6th Aeroacoustics Conference and Exhibit, 2000, , Lahaina, HI, United States, 2000-06-12 - 2000-06-14
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Local EPrints ID: 467743
URI: http://eprints.soton.ac.uk/id/eprint/467743
PURE UUID: f2cd6d5e-1552-4842-bdd2-1c8d127e0777
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Date deposited: 21 Jul 2022 16:57
Last modified: 17 Mar 2024 02:32
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