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Noise source location in turbomachinery using coherence based modal decomposition
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland .
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland .ORCID iD: 0000-0003-0176-5358
DLR, German Aerospace Center.
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland .
2009 (English)In: 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), 2009Conference paper, Published paper (Other academic)
Abstract [en]

Coherence based source analysis techniques can be used to identify the contribution of turbomachinery core noise sources to pressure measurements in the far-field. The usual approach is to locate a measurement sensor within the engine and to calculate the ordinary coherence function between this and the far-field pressure measurement. If the internal measurement is close to a dominant noise source, the technique will identify this sources' contribution to the overall far-field energy. Modal decomposition is an advanced technique which can provide detailed information as to the modal content of sound propagating in ducts. When applied to aero-engines, the technique can be used as a diagnostic to determine which of the many rotor-stator stages contribute most to the overall radiated sound power. The method developed in this paper discusses how the two techniques can be combined to locate the plane at which a mode is generated within an aeroengine. A proof of concept of the technique is successfully demonstrated with the use of simulated data.

Place, publisher, year, edition, pages
2009.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-159526DOI: 10.2514/6.2009-3367Scopus ID: 2-s2.0-78149458808ISBN: 978-156347974-8 (print)OAI: oai:DiVA.org:kth-159526DiVA: diva2:785466
Conference
15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference); Miami, FL; United States 11 May 2009 through 13 May 2009
Note

QC 20150701

Available from: 2015-02-03 Created: 2015-02-03 Last updated: 2016-08-22Bibliographically approved

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O'Reilly, Ciarán

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • asciidoc
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