Epistemic Review
Confidence: 51%
Sources
To-do
- Look up Noise Vibration Harshness by FAA and EASA
- Exterior and Interior noise
- NASA Overflow software for aerodynamic pressure modelling
- Silent eVTOLs
Small propeller diameter + high rotational speed of propeller blade tip → intense high-frequency pressure waves
Large propeller diameters + slower blade tip rotational speed → impulsive low-frequency pressure waves
Intensity and frequency
- Propeller diameter controls noise intensity
- Propeller speed controls noise frequency
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[?] How does wingspan affect noise? Greater wingspan increases contact area with air molecules, thus increasing noise
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Paper on BLI ducted fans for reducing noise in eVTOLs
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Joby Aviation is making eVTOLs that produce less noise (~50 dBA)