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A Low-Cost Anechoic Chamber for Rotor Aeroacoustics Research: Design and Validation Cover

A Low-Cost Anechoic Chamber for Rotor Aeroacoustics Research: Design and Validation

Transactions on Aerospace Research
Volume 2025 (2025): Issue 2 (June 2025)
By: Pawel Kekus-Kumor and  Adam Sieradzki  
Open Access
|Jun 2025

Figures & Tables

Fig. 1.

The anechoic chamber at Ł-ILOT during construction and after completion.
The anechoic chamber at Ł-ILOT during construction and after completion.

Fig. 2.

The acoustic lining of the chamber, during installation and after completion.
The acoustic lining of the chamber, during installation and after completion.

Fig. 3.

Background noise in the anechoic chamber: PSD of acoustic pressure at position [0.79, −0.85, 0] and outside of the chamber for reference (left), and SPL spatial distribution (right).
Background noise in the anechoic chamber: PSD of acoustic pressure at position [0.79, −0.85, 0] and outside of the chamber for reference (left), and SPL spatial distribution (right).

Fig. 4.

SPL deviations from the inverse square law in the anechoic chamber; maximum deviations permitted by the ISO 3745 standard are plotted in red.
SPL deviations from the inverse square law in the anechoic chamber; maximum deviations permitted by the ISO 3745 standard are plotted in red.

Fig. 5.

Rotor testing rig: schematic and the assembled setup in the anechoic chamber.
Rotor testing rig: schematic and the assembled setup in the anechoic chamber.

Fig. 6.

Sample sound spectra of a rotor obtained with and without the shroud.
Sample sound spectra of a rotor obtained with and without the shroud.

Fig. 7.

Diagram of the flow recirculation pattern forming during rotor operation in the anechoic chamber.
Diagram of the flow recirculation pattern forming during rotor operation in the anechoic chamber.

Fig. 8.

Time series of SPL deviation for the benchmark rotor tested in the anechoic chamber at different rotational speeds, starting from the moment of stabilisation of rotational speed.
Time series of SPL deviation for the benchmark rotor tested in the anechoic chamber at different rotational speeds, starting from the moment of stabilisation of rotational speed.

Fig. 9.

Sound spectra of the benchmark propeller. Comparison between the benchmark study and the results obtained in the Ł-ILOT anechoic chamber in two conditions, for the in-plane microphone, with matched thrust.
Sound spectra of the benchmark propeller. Comparison between the benchmark study and the results obtained in the Ł-ILOT anechoic chamber in two conditions, for the in-plane microphone, with matched thrust.

Fig. 10.

Sound spectra of the benchmark propeller. Comparison between the benchmark study and the results obtained in the Ł-ILOT anechoic chamber in two conditions, for the in-plane microphone, with matched rotational speed.
Sound spectra of the benchmark propeller. Comparison between the benchmark study and the results obtained in the Ł-ILOT anechoic chamber in two conditions, for the in-plane microphone, with matched rotational speed.
DOI: https://doi.org/10.2478/tar-2025-0007 | Journal eISSN: 2545-2835
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Language: English
Page range: 18 - 39
Submitted on: Jan 16, 2024
|
Accepted on: Mar 28, 2025
|
Published on: Jun 30, 2025
Published by: ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
anechoic chamber,
aeroacoustics,
rotors,
UAV
Related subjects:
Engineering,
Introductions and overviews,
Engineering, other,
Geosciences,
Geosciences, other,
Materials sciences,
Materials sciences, other,
Physics,
Physics, other

© 2025 Pawel Kekus-Kumor, Adam Sieradzki, published by ŁUKASIEWICZ RESEARCH NETWORK – INSTITUTE OF AVIATION
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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