Integrated Evaluation of the Aeroacoustics and Psychoacoustics of a Single Propeller

Jianwei Sun, Koichi Yonezawa, Eiji Shima and Hao Liu ()
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Jianwei Sun: Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
Koichi Yonezawa: Central Research Institute of Electrical Power Industry, Abiko 270-1194, Japan
Eiji Shima: Japan Aerospace Exploration Agency, Tokyo 181-0015, Japan
Hao Liu: Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan

IJERPH, 2023, vol. 20, issue 3, 1-23

Abstract: Aeroacoustic noise in multiple rotor drones has been increasingly recognized as a crucial issue, while noise reduction is normally associated with a trade-off between aerodynamic performance and sound suppression as well as sound quality improvement. Here, we propose an integrated methodology to evaluate both aeroacoustics and psychoacoustics of a single propeller. For a loop-type propeller, an experimental investigation was conducted in association with its aerodynamic and acoustic characteristics via a hover stand test in an anechoic chamber; the psychoacoustic performance was then examined with psychoacoustic annoyance models to evaluate five psychoacoustic metrics comprising loudness, fluctuation strength, roughness, sharpness, and tonality. A comparison of the figure of merit (FM), the overall sound pressure level (OASPL) and psychoacoustic metrics was undertaken among a two-blade propeller, a four-blade propeller, the loop-type propeller, a wide chord loop-type propeller, and a DJI Phantom III propeller, indicating that the loop-type propeller enables a remarkable reduction in OASPL and a noticeable improvement in sound quality while achieving comparable aerodynamic performance. Furthermore, the psychoacoustic analysis demonstrates that the loop-type propeller can improve the psychological response to various noises in terms of the higher-level broadband and lower-level tonal noise components. It is thus verified that the integrated evaluation methodology of aeroacoustics and psychoacoustics can be a useful tool in the design of low-noise propellers in association with multirotor drones.

Keywords: loop-type propeller; aerodynamic noise; psychoacoustic; broadband noise; tonal noise (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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