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.
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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/ | ||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||||||
Title: | A Tomographic Directivity Approach to Frequency Domain Beamforming | ||||||||||||||||||||||||
Authors: |
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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 (old) | ||||||||||||||||||||||||
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: | 29 Mar 2023 00:36 |
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