TY - GEN
T1 - An Experimental Investigation of eVTOL Flight State Variance on Noise
AU - Valente, Vitor T.
AU - Greenwood, Eric
AU - Johnson, Eric N.
N1 - Funding Information:
This research was funded by the U.S. Federal Aviation Administration Office of Environment and Energy (AEE) through ASCENT, the FAA Center of Excellence for Alternative Jet Fuels and the Environment, Project 77 through FAA Award Number 13-C-AJFE-PSU Amendment No. 67 managed by Dr. Hua (Bill) He of AEE. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the FAA. The author V.T.V. was partly supported by Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul - IFRS/Brazil.
Funding Information:
This research was funded by the U.S. Federal Aviation Administration Office of Environment and Energy (AEE) through ASCENT, the FAA Center of Excellence for Alternative Jet Fuels and the Environment, Project 77 through FAA Award Number 13-C-AJFE-PSU Amendment No. 67 managed by Dr. Hua (Bill) He of AEE. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the FAA. The author V.T.V. was partly supported by Instituto Federal de Educac¸ão, Ciência e Tecnologia do Rio Grande do Sul - IFRS/Brazil.
Publisher Copyright:
Copyright © 2023 by the Vertical Flight Society. All rights reserved.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:85167673347
T3 - FORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display
BT - FORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display
PB - Vertical Flight Society
T2 - 79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023
Y2 - 16 May 2023 through 18 May 2023
ER -