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An extended formulation of the SODIX method with application to aeroengine broadband noise

Funke, St. and Skorpel, A. and Michel, U. (2012) An extended formulation of the SODIX method with application to aeroengine broadband noise. In: Proceedings 18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference). 18th AIAA/CEAS Aeroacoustics Conferance (33rd AIAA Aeroacoustics Conference), 04.06. - 06.06.2012, Colorado Springs, Colorado, USA. ISBN 978-1-62276-215-6

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Abstract

An improved version of the inverse source location method SODIX is presented. SODIX models broadband nosie sources with a st of directive point sources by minimizing the difference between a measured and a simulated cross-spectral matrix of microphone signals. One big advantage of the method in comparison to other source location methods is, that it calculates a directive source strength from each point source towards each microphone. The new version of SODIX includes an implicit consideration of the constraint of positive source strengths in the iteration process. This improvement made the optimization process more stable and in addition independent of the initially assume source distribution. The method is also extended for applications with multidimensional source and microphone arrangements. Further, it is shown that the main diagonal of gthe cross-spectral matrix can be removed from the calculations without any mathematical violations and that the absolute strengths of the dominating sources are preserved. The improvements of the method are shown with exemplary results using measured data from a static aeroengine freefield test.

Item URL in elib:https://elib.dlr.de/80043/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:An extended formulation of the SODIX method with application to aeroengine broadband noise
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Funke, St.UNSPECIFIEDUNSPECIFIED
Skorpel, A.Technische Universität BerlinUNSPECIFIED
Michel, U.Institut für Strömungsmechanik und Technische Akustik, TU BerlinUNSPECIFIED
Date:2012
Journal or Publication Title:Proceedings 18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-1-62276-215-6
Status:Published
Keywords:SODIX, engine nosie, source localization, source localisation
Event Title:18th AIAA/CEAS Aeroacoustics Conferance (33rd AIAA Aeroacoustics Conference)
Event Location:Colorado Springs, Colorado, USA
Event Type:international Conference
Event Dates:04.06. - 06.06.2012
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Kaur, Balbir
Deposited On:10 Jan 2013 11:29
Last Modified:10 Jan 2013 11:29

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