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A review of engine noise source diagnostic methods for static engine tests, with phased array and polar correlation techniques

A review of engine noise source diagnostic methods for static engine tests, with phased array and polar correlation techniques
A review of engine noise source diagnostic methods for static engine tests, with phased array and polar correlation techniques
This paper reviews the state of the art of engine noise source evaluation using microphone arrays and identifies issues that are currently not well understood. It is found that most methods currently assume a model of uncorrelated point sources. However it will be shown that this is not a necessary assumption and images of the complete source CSD can be obtained, but that the effect of source convection cannot be readily obtained from the source image. It is also shown how source images can be improved by frequency averaging across the far field CSD matrix. This approaches reduces aliasing and improves the source image especially at high frequencies.
Tester, B.J.
1bd4a793-131b-4173-93cc-3eca70b2d116
Glegg, S.A.L.
dd74ce1b-d3a9-4356-b8a6-a173eaa2c26e
Tester, B.J.
1bd4a793-131b-4173-93cc-3eca70b2d116
Glegg, S.A.L.
dd74ce1b-d3a9-4356-b8a6-a173eaa2c26e

Tester, B.J. and Glegg, S.A.L. (2008) A review of engine noise source diagnostic methods for static engine tests, with phased array and polar correlation techniques. Proceedings of the 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). 05 - 07 May 2008.

Record type: Conference or Workshop Item (Paper)

Abstract

This paper reviews the state of the art of engine noise source evaluation using microphone arrays and identifies issues that are currently not well understood. It is found that most methods currently assume a model of uncorrelated point sources. However it will be shown that this is not a necessary assumption and images of the complete source CSD can be obtained, but that the effect of source convection cannot be readily obtained from the source image. It is also shown how source images can be improved by frequency averaging across the far field CSD matrix. This approaches reduces aliasing and improves the source image especially at high frequencies.

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More information

Published date: 2008
Additional Information: Paper Number: AIAA-2008-2854
Venue - Dates: Proceedings of the 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), 2008-05-05 - 2008-05-07

Identifiers

Local EPrints ID: 57781
URI: https://eprints.soton.ac.uk/id/eprint/57781
PURE UUID: f54d608e-2659-41f6-b8f5-83a0e19b343f

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Date deposited: 20 Aug 2008
Last modified: 13 Mar 2019 20:33

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