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A Comparison of Microphone Phased Array Methods Applied to the Study of Airframe Noise in Wind Tunnel Testing

Bahr, Christopher J. and Humphreys, William M. and Ernst, Daniel and Ahlefeldt, Thomas and Spehr, Carsten and Pereira, Antonio and Leclere, Quentin and Picard, Christophe and Porteous, Ric and Moreau, Oanielle and Fischer, Jeoffrey R. and Doolan, Con J. (2017) A Comparison of Microphone Phased Array Methods Applied to the Study of Airframe Noise in Wind Tunnel Testing. AIAA 2017, 05.-09. Juni 2017, Denver, USA.

Full text not available from this repository.

Official URL: https://aviation.aiaa.org/archive2017/

Abstract

In this werk, various microphone phased array data processing techniques are applied to two existing datasets from aeroacoustic wind tunnel tests. The first of these is from a !arge closed-wall facility, DLR's Kryo-Kanal Köln (DNW·KKK), and is a measurement cf the high-lift noise cf a semispan model. The second is from a small-scale open-jet facility, the NASA Langley Quiet Flow Facility (QFF), and is a measurement cf a clean airfoil selfnoise. The data had been made publicly available in 2015, and were analyzed by several research groups using multiple analysis techniques. This procedure allows the assessment of the variability of individual methods across various organizational implementations, as weil as the variability cf results produced by different array analysis methods. This paper summarizes the results presented at panel sessions held at AIAA conferences in 2015 and 2016. Results show that with appropriate handling of background noise, all advanced methods can identify dominant acoustic sources for a broad range cf frequencies. Lowerlevel sources may be masked er underpredicted. lntegrated levels are more robust and in closer agreement between methods than narrowband maps for individual frequencies. Overall there is no obvious best method, though multiple methods may be used to bound expected behavior.

Item URL in elib:https://elib.dlr.de/118013/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper DOI: 10.2514/6.2017-3718
Title:A Comparison of Microphone Phased Array Methods Applied to the Study of Airframe Noise in Wind Tunnel Testing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bahr, Christopher J.NASA Langley Research Center, Hampton, VA 23681UNSPECIFIED
Humphreys, William M.UNSPECIFIEDUNSPECIFIED
Ernst, DanielDaniel.Ernst (at) dlr.deUNSPECIFIED
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.deUNSPECIFIED
Spehr, Carstencarsten.spehr (at) dlr.deUNSPECIFIED
Pereira, AntonioUNSPECIFIEDUNSPECIFIED
Leclere, QuentinUNSPECIFIEDUNSPECIFIED
Picard, ChristopheUNSPECIFIEDUNSPECIFIED
Porteous, RicUNSPECIFIEDUNSPECIFIED
Moreau, OanielleUNSPECIFIEDUNSPECIFIED
Fischer, Jeoffrey R.UNSPECIFIEDUNSPECIFIED
Doolan, Con J.UNSPECIFIEDUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Beamforming, Phased Array
Event Title:AIAA 2017
Event Location:Denver, USA
Event Type:international Conference
Event Dates:05.-09. Juni 2017
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
Deposited By: Bachmann, Barbara
Deposited On:11 Jan 2018 08:46
Last Modified:11 Jan 2018 08:46

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