Noise source location in turbomachinery using coherence based modal decomposition
2009 (English)In: 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference), 2009Conference paper (Other academic)
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
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-159526DOI: 10.2514/6.2009-3367ScopusID: 2-s2.0-78149458808ISBN: 978-156347974-8OAI: oai:DiVA.org:kth-159526DiVA: diva2:785466
15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference); Miami, FL; United States 11 May 2009 through 13 May 2009
QC 201507012015-02-032015-02-032016-08-22Bibliographically approved