Small UAV Acoustic Design, Analysis and Testing

Yang, Max; Darrah, Drew; Eppler, Joel; Liu, Wanbo; Anemaat, Willem A.

doi:10.2514/6.2019-1073

Cited by 3 publications

(1 citation statement)

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“…While the static aerodynamic data has been previously validated [2][3][4], the aeroacoustic test bench was recently designed and tested, thereby necessitating a data validation procedure. Figure 9 compares the SPL spectral data of the DJI carbon fiber propeller at an RPM of 5300 with results from Yang et al [29]. Yang et al utilized a similar test setup as was used in this study with a DJI Phantom 2 propeller and motor.…”

Section: Aeroacoustic Data Validationmentioning

confidence: 97%

Aerodynamic and Aeroacoustic Performance of Small UAV Propellers in Static Conditions

Jordan

Deters

Narsipur³

2020

Aiaa Aviation 2020 Forum

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The proliferation of small multi-rotor UAVs in commercial, recreational, and surveillance spheres has garnered significant interest in the noise produced by these vehicles. The current research aims to study the relationship between the aerodynamic performance and acoustic characteristics of small-scale UAV propellers. Three commercially available propellers for the DJI Phantom 2/3 UAV were selected for preliminary development and validation of an aeroacoustic experimental test setup and associated data reduction methods. Propeller thrust, torque, and power measurements were recorded at static conditions. Upon successful validation of the test bench, acoustic measurements were taken at the propeller disk's upstream and in-plane locations. The power spectral density of these acoustic signals was estimated using the modified periodogram (Welch's) method to identify frequency content and calculate sound pressure levels (SPLs) at each of the observation locations. Additionally, time-frequency analysis verified the periodogram results and identified possible sources of transient noise at static thrust. These methods found the nonrotor noise to be a major contributor to the SPL at higher frequencies and the propeller noise dominating the SPL spectra at the lower frequencies. Experimental thrust, torque, power, and sound pressure level (SPL) data were then compared for each propeller to identify relationships between aerodynamic performance and acoustic characteristics with variations in propeller geometry and blade loading.

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