@inproceedings{b194fe0f4bb64cbeb522c0365c5604bb,
title = "An Experimental Investigation of eVTOL Flight State Variance on Noise",
abstract = "Experimental data collected for a custom multirotor aircraft are used to perform an analysis to relate the variability of noise levels measured on the ground to the state vector of the vehicle in hover. Data from a total of sixty-nine hover points are used to correlate the aircraft state to A-weighted Sound Pressure Levels measured at a microphone located directly underneath the aircraft. A spherical spreading normalization is applied to the data to allow data collected from different altitudes to be compared to one another. Noise levels are found to increase as vehicle attitude (orientation) and attitude rates diverge from the trim condition. The noise was found to be most sensitive to changes in yaw or yaw rate. Conversely, the noise was found to decrease as the commanded thrust of the vehicle increased. Additional analysis indicates that the mean A-weighted Sound Pressure Level increases when the variability of the vehicle flight condition is increased.",
author = "Valente, \{Vitor T.\} and Eric Greenwood and Johnson, \{Eric N.\}",
note = "Publisher Copyright: Copyright {\textcopyright} 2023 by the Vertical Flight Society. All rights reserved.; 79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023 ; Conference date: 16-05-2023 Through 18-05-2023",
year = "2023",
language = "English (US)",
series = "FORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display",
publisher = "Vertical Flight Society",
booktitle = "FORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display",
}