Issue |
Acta Acust.
Volume 6, 2022
Topical Issue - Aeroacoustics: state of art and future trends
|
|
---|---|---|
Article Number | 58 | |
Number of page(s) | 13 | |
DOI | https://doi.org/10.1051/aacus/2022052 | |
Published online | 09 December 2022 |
Scientific Article
In-flight directivity and sound power measurement of small-scale unmanned aerial systems
Technische Universität Berlin, Department of Engineering Acoustics, 10587 Berlin, Germany
* Corresponding author: gert.herold@tu-berlin.de
Received:
30
March
2022
Accepted:
10
November
2022
The sound emission characteristics of unmanned aerial systems are of interest in many contexts. For a realistic representation of the directional characteristics and the radiated sound energy, it is useful if the aircraft is operated under realistic conditions. However, deriving emission-based acoustic quantities for a typical mode of operation such as cruise flight is difficult. In this paper, the directivity and sound power of a quadcopter drone are determined using a microphone array measurement of a single flight through a predefined corridor. The recorded data are processed to both reconstruct the drone’s flight path and characterize its acoustic emission. To verify the reliability of the presented method, the signal processing is tested with simulated data from moving sources with the directivity of a monopole as well as a dipole. Using different discretizations of the radiation direction space and evaluating the frequency-dependent directivity factor, it is discussed how the sound radiation can be described as comprehensively as possible on the basis of as few quantities as possible.
Key words: Microphone array method / Sound power measurement / UAS noise / Source localization
© The Author(s), Published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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