TY - CONF
T1 - Variation in Helicopter Noise During Approach Maneuvers
AU - Zachos, Damaris R.
AU - Weist, Lauren
AU - Brentner, Kenneth S.
AU - Greenwood, Eric
N1 - Funding Information:
This work was funded by the U.S. Federal Aviation Administration (FAA) Office of Environment and Energy through ASCENT, the FAA Center of Excellence for Alternative Jet Fuels and the Environment, Project 38 through FAA Award Number 13-C AJFE-PSU-074 under the supervision of Rick Riley. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the FAA.
Publisher Copyright:
Copyright © 2022 by the Vertical Flight Society. All rights reserved
PY - 2022
Y1 - 2022
N2 - The Helicopter Association International (HAI) “Fly Neighborly” program aims to provide helicopter pilots with recommendations to effectively reduce the noise of their operations. One aspect of this program encourages the development of approach trajectories that avoid airspeed and flight path angle combinations associated with high levels of noise generation. These trajectories necessarily involve changes in speed and flight path angle; i.e., there is an acceleration. To understand the effect of acceleration on noise, a parametric sweep of both longitudinal acceleration and time rate of change of flight path angle (vertical acceleration) were completed for a model of the Sikorsky S-76D helicopter. This was done utilizing a PSU noise prediction system that is a coupled flight simulation (PSUHeloSim), rotor comprehensive analysis (CHARM), and noise prediction code (PSU-WOPWOP). These sweeps are compared with noise predictions for trajectories processed through the PSU noise prediction system that follow flight test data collected in the 2019 joint NASA/FAA/Army flight test.
AB - The Helicopter Association International (HAI) “Fly Neighborly” program aims to provide helicopter pilots with recommendations to effectively reduce the noise of their operations. One aspect of this program encourages the development of approach trajectories that avoid airspeed and flight path angle combinations associated with high levels of noise generation. These trajectories necessarily involve changes in speed and flight path angle; i.e., there is an acceleration. To understand the effect of acceleration on noise, a parametric sweep of both longitudinal acceleration and time rate of change of flight path angle (vertical acceleration) were completed for a model of the Sikorsky S-76D helicopter. This was done utilizing a PSU noise prediction system that is a coupled flight simulation (PSUHeloSim), rotor comprehensive analysis (CHARM), and noise prediction code (PSU-WOPWOP). These sweeps are compared with noise predictions for trajectories processed through the PSU noise prediction system that follow flight test data collected in the 2019 joint NASA/FAA/Army flight test.
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M3 - Paper
AN - SCOPUS:85135020874
T2 - 78th Vertical Flight Society Annual Forum and Technology Display, FORUM 2022
Y2 - 10 May 2022 through 12 May 2022
ER -