Propeller Noise Prediction for Transient eVTOL Missions
Abstract
Transient propeller noise generated by electric vertical take-off and landing (eVTOL) aircraft is a critical contributor to urban air mobility annoyance. This paper analyses noise emissions in transient eVTOL maneuvers, concentrating on the hover, transition, and climb phases. The study employs aeroelastic simulation in the time domain, determining a two-bladed lifting propeller's unsteady aerodynamic forces and blade motion. Noise emissions are predicted with Farassat’s formulation 1A. The designed lifting propeller has a predominant loading noise during hover, altered by elastic deformations. The climb and transition phases analysis reveals significant noise contributions from rotational speed variations and horizontal acceleration. Vertical acceleration has a lower impact on the noise emissions. Oblique inflow into the propeller plane leads to tonal peaks in a high-frequency band. Changes in the rotational speed lead to aperiodic beats.
Authors 4
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Ole Bergmann Aachen
Affiliation as printed
FH Aachen
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Felix Möhren Aachen
Affiliation as printed
FH Aachen
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Carsten Braun Aachen
Affiliation as printed
FH Aachen
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Frank Janser Aachen
Affiliation as printed
FH Aachen
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