Fly-Over Noise Measurements of a Distributed Propulsion Flight Demonstrator

In this study, fly-over noise measurements were conducted on a flight demonstrator equipped with distributed propulsion. Five distinct fly-over scenarios were executed, with noise data captured using an acoustic array. By utilizing GPS data and flight speed data, the noise signature of each fly-over was analyzed by segmenting the time signal into multiple sections. Furthermore, due to background noise, frequency ranges containing the blade passing frequencies were filtered from the raw signal. Combining the GPS, flight speed and acoustic data allowed for the reconstruction of noise carpets. The results show that all noise carpets exhibited a similar directivity pattern, with a distinct region of higher noise emission. Additionally, a background noise cancellation method was introduced, which did not affect the observed frequency range.