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Microphone Array Applications in Cabins

Kokavecz, Judith and Spehr, Carsten and Seemann, Lasse (2012) Microphone Array Applications in Cabins. inter.noise 2012, 19. - 22. Aug. 2012, New York City, USA.

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Official URL: http://internoise2012.com

Abstract

Air transportation has always been linked with aeroacoustic noise generation. To study these noise generating effects wind tunnels are used with scaled models because of the limited wind tunnel size. But studies of interior noise problems with scaled models are difficult as the model structure behaves differently in terms of sound transmission compared with an authentic cabin. Therefore, an in-situ measurement technique for source localization during operation is needed. In addition to the other noise-generating sources the aerodynamic and aeroacoustic excitation of the fuselage causes energy transmission into the cabin. The sound field generation is induced by structure-borne sound radiation of the lining (or window or floor). Due to the limited space in cabins and a vibrating lining which surrounds the measurement area, a pivotable array with 60 microphones was constructed. Because of the reverberation in cabins, sound source localization with conventional beamforming is not possible, so that an average beamforming method has to be used for sound source localization. A comparison between average and the conventional beamforming methods will be shown. First results from measurements in the DLR Do728 cabin test facility will demonstrate the source localization in cabins with this method. The average beamforming method is not limited to aircraft cabins and can be used for sound source localization in high-speed trains as well.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Microphone Array Applications in Cabins
Authors:
AuthorsInstitution or Email of Authors
Kokavecz, JudithUNSPECIFIED
Spehr, CarstenUNSPECIFIED
Seemann, LasseUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings on DVD
Status:Published
Keywords:phased microphone array , source localization in cabins, flight test measurement, average beamforming
Event Title:inter.noise 2012
Event Location:New York City, USA
Event Type:international Conference
Event Dates:19. - 22. Aug. 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:04 Sep 2012 15:15
Last Modified:09 Oct 2012 15:04

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