What is it about?
Rotorcraft noise is typically analyzed using traditional sound metrics, which average the noise over several rotor revolutions. However, this ignores the time-varying characteristics of noise that make it annoying. In this paper, we analyze how noise varies over a rotation of helicopter main and tail rotors, for different flight conditions.
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Why is it important?
Aircraft noise has historically focused on how loud noise levels are, not how sound is perceived by humans. Recent advances in helicopters and electric aircraft have lowered noise levels, but further work is needed to ensure that their noise is acceptable to the public. This is important because community acceptance is required for civil aviation operations.
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This page is a summary of: Time Variation of Helicopter Rotor Broadband Noise, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-2914.
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