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A Tomographic Directivity Approach to Frequency Domain Beamforming

Ahlefeldt, Thomas and Spehr, Carsten and Berkefeld, Tobias and Di Marco, Alessandro and Burghignoli, Lorenzo (2018) A Tomographic Directivity Approach to Frequency Domain Beamforming. In: AIAA Aeroacoustic Conference 2018 (2808), pp. 1-13. AIAA. AIAA Aeroacoustic Conference, 25.-29. Juni 2018, Atlanta, USA. DOI: 10.2514/6.2018-2808

Full text not available from this repository.

Official URL: https://arc.aiaa.org/doi/10.2514/6.2018-2808

Abstract

Aeroacoustic measurements in wind tunnels are a common tool in the determination of sound sources on scaled models. Most of the algorithms used are based on the assumption that the unknown aeroacoustic sources radiate sound waves omnidirectionally, thus monopole sources are utilized. For the prediction of the noise footprint of aircrafts however, it is essential to have information on the directivity of the airframe sources. An approach to estimating this directivity is to use different array positions for measurement relative to the model which leads to different observation angles. The evaluation of measurements at several observation angles holds several issues, for example the difficult source localization due to the three-dimensionality of the point spread function and partial shadowing of sources at large observation angles. This paper therefore presents an approach to estimate the source positions taking into account information from all four observation angles at once. The positions estimated in this fashion are subsequently used for an improved prediction of source power and eventually lead to an estimation of directivity of the observed aeroacoustic sources.

Item URL in elib:https://elib.dlr.de/119063/
Document Type:Conference or Workshop Item (Speech)
Title:A Tomographic Directivity Approach to Frequency Domain Beamforming
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahlefeldt, ThomasThomas.Ahlefeldt (at) dlr.deUNSPECIFIED
Spehr, Carstencarsten.spehr (at) dlr.deUNSPECIFIED
Berkefeld, Tobiastobias.berkefeld (at) dlr.deUNSPECIFIED
Di Marco, AlessandroUniversity Roma TRE, ItalyUNSPECIFIED
Burghignoli, LorenzoUniversity Roma TRE, ItalyUNSPECIFIED
Date:2018
Journal or Publication Title:AIAA Aeroacoustic Conference 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2018-2808
Page Range:pp. 1-13
Publisher:AIAA
Series Name:Conference proceedings online
Status:Published
Keywords:beamforming, microphone array, directivity, aeroacoustics, wind tunnel
Event Title:AIAA Aeroacoustic Conference
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:25.-29. Juni 2018
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Micknaus, Ilka
Deposited On:03 Dec 2018 15:42
Last Modified:04 Dec 2018 14:45

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