Psychoacoustic Evaluation of an Array of Distributed Propellers Under Synchrophasing Operation
F. do Nascimento Monteiro (TU Delft - Wind Energy)
R. Merino-Martínez (TU Delft - Aircraft Noise and Climate Effects)
Lourenço T. Lima Pereira (TU Delft - Wind Energy)
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Abstract
This preliminary study evaluates the expected psychoacoustics annoyance of an array of distributed propellers operating at different synchrophasing angles between the propeller blades. The study, conducted in a hybrid test section wind tunnel, focused on a three-propeller array in a tractor configuration. The noise emissions were measured using a phased microphone array. Both conventional noise metrics and state-of-the-art psychoacoustic metrics were calculated, enabling a thorough analysis of the noise characteristics produced by these configurations and their expected noise perception. The study found that the relative blade-phase angle significantly influences the levels of the conventional noise metrics and psychoacoustic metrics. These results highlight the potential of controlling relative blade-phase angles to reduce noise annoyance. They also emphasize the importance of conducting psychoacoustic analysis in design configurations like the one examined here.