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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/36149

Title: Noise Source Location in Turbomachinery Using Coherence Based Modal Decomposition
Other Titles: 15th AIAA /CEAS Aeroacoustics Conference
Author: BENNETT, GARETH
FITZPATRICK, JOHN AIDAN
Author's Homepage: http://people.tcd.ie/bennettg
http://people.tcd.ie/jftzptrk
Keywords: Mechanical & Manufacturing Engineering
Issue Date: 2009
Citation: Gareth J. Bennett, Ciarán O'Reilly, Ulf Tapken, John Fitzpatrick, Noise Source Location in Turbomachinery Using Coherence Based Modal Decomposition, 15th AIAA /CEAS Aeroacoustics Conference, Miami, Florida, 11-13 May 2009, 2009
Abstract: 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.
Description: PUBLISHED
Miami, Florida
URI: http://hdl.handle.net/2262/36149
Appears in Collections:Mechanical & Manufacturing Eng (Scholarly Publications)

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