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Article

Tonal-Noise Assessment of Quadrotor-Type UAV Using Source-Mode Expansions

1
École Centrale de Lyon, Université de. Lyon, 36 Avenue Guy de Collongue, 69134 Écully, France
2
Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
*
Author to whom correspondence should be addressed.
Acoustics 2020, 2(3), 674-690; https://doi.org/10.3390/acoustics2030036
Received: 8 August 2020 / Revised: 3 September 2020 / Accepted: 3 September 2020 / Published: 17 September 2020
(This article belongs to the Special Issue Aeroacoustics of Turbomachines)
The present work deals with the modeling of the aerodynamic sound generated by the propellers of small-size drones, taking into account the effects of horizontal forward flight with negative pitch and of installation on supporting struts. Analytical aeroacoustic formulations are used, dedicated to the loading noise. The fluctuating lift forces on the blades are expanded as circular distributions of acoustic dipoles, the radiated field of which is calculated by using the free-space Green’s function. This provides descriptions of the sound field, valid in the entire space. The stationary mean-flow distortions responsible for the lift fluctuations and at the origin of the sound are estimated from existing numerical flow simulations and from ad hoc models. Installation and forward-flight effects are found to generate much more sound than the steady loading on the blades associated with thrust. Therefore, the models are believed reliable fast-running tools that could be used for preliminary low-noise design through repeated parametric calculations, or for noise-impact estimates corresponding to prescribed urban traffic. View Full-Text
Keywords: aeroacoustics; fan noise; analytical modelling; computational aeroacoustics aeroacoustics; fan noise; analytical modelling; computational aeroacoustics
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MDPI and ACS Style

Roger, M.; Moreau, S. Tonal-Noise Assessment of Quadrotor-Type UAV Using Source-Mode Expansions. Acoustics 2020, 2, 674-690. https://doi.org/10.3390/acoustics2030036

AMA Style

Roger M, Moreau S. Tonal-Noise Assessment of Quadrotor-Type UAV Using Source-Mode Expansions. Acoustics. 2020; 2(3):674-690. https://doi.org/10.3390/acoustics2030036

Chicago/Turabian Style

Roger, Michel, and Stéphane Moreau. 2020. "Tonal-Noise Assessment of Quadrotor-Type UAV Using Source-Mode Expansions" Acoustics 2, no. 3: 674-690. https://doi.org/10.3390/acoustics2030036

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