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Experimental Measurement of a UAV Rotor’s Acoustic Emission

Lößle, Felix and Kostek, Anna and Schmid, Rainer (2021) Experimental Measurement of a UAV Rotor’s Acoustic Emission. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII, 151, pp. 387-396. Springer Nature. 22. STAB/DGLR Symposium 2020, 15. Juli 2020, Göttingen, Deutschland. doi: 10.1007/978-3-030-79561-0_37. ISBN 978-3-030-79560-3. ISSN 1612-2909.

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Official URL: https://link.springer.com/book/10.1007/978-3-030-79561-0#editorsandaffiliations


Besides aerodynamic performance, most unmanned aerial vehicles (UAVs) are limited by noise emission in their range of application. Especially in urban areas, the acceptance of UAV noise emission by the affected population is required. Therefore, one objective of DLR’s project URBAN RESCUE is to investigate the noise emission and noise generation mechanisms of small rotors. In order to study noise emission, a test setup was established in DLR’s 1m wind tunnel. For different flight modes, acoustic measurements were conducted using a microphone array. For all test cases the noise emission of the rotor’s blade passing frequency (BPF) is higher in front of the rotor (upstream) than behind it. Due to higher relative velocities on the advancing side than on the retreating side, emission is asymmetric with respect to the flow direction. Additionally, a time-resolved background-oriented schlieren (BOS) setup was used to visualize tip vortices and study noise generation mechanisms.

Item URL in elib:https://elib.dlr.de/136456/
Document Type:Conference or Workshop Item (Other)
Additional Information:Hardcover ISBN 978-3-030-79560-3 Softcover ISBN 978-3-030-79563-4 eBook ISBN 978-3-030-79561-0 Series ISSN 1612-2909 Series E-ISSN 1860-0824
Title:Experimental Measurement of a UAV Rotor’s Acoustic Emission
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lößle, Felixfelix.loessle (at) dlr.deUNSPECIFIED
Kostek, Annaanna.kostek (at) dlr.deUNSPECIFIED
Schmid, RainerRainer.Schmid (at) dlr.deUNSPECIFIED
Date:14 July 2021
Journal or Publication Title:22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/978-3-030-79561-0_37
Page Range:pp. 387-396
EditorsEmailEditor's ORCID iD
Dillmann, AndreasAndreas.Dillmann@dlr.deUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Wagner, ClausClaus.Wagner@DLR.deUNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:UAV, unmanned aerial vehicle, noise emission, small rotors, acoustic measurements, Ffowcs-Williams/Hawkings-equation, blade element theory
Event Title:22. STAB/DGLR Symposium 2020
Event Location:Göttingen, Deutschland
Event Type:national Conference
Event Dates:15. Juli 2020
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:08 Dec 2020 23:00
Last Modified:04 Jan 2022 10:14

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