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Development and Validation of Generic Maneuvering Flight Noise Abatement Guidance for Helicopters

James H. Stephenson, US Army CCDC AvMC
Michael E. Watts, Analytical Mechanics Associates Inc.
Kyle A. Pascioni, NASA Langley Research Center
Eric Greenwood, Penn State University

October 10, 2020

https://doi.org/10.4050/F-0076-2020-16488

Abstract:
An extensive flight test campaign has been conducted to look into developing actionable advice for pilots of today’s vehicles to reduce their acoustic footprints. Ten distinct vehicles were tested at three different test ranges, with nine of the vehicles’ data being documented here. Twelve pairs of turning conditions were tested to determine their effect on blade-vortex interaction noise. Each turning flight condition was evaluated using the peak A-weighted, band-limited (50 Hz- 2500 Hz), sound pressure level measured throughout the maneuver. This metric was a surrogate for bladevortex interaction noise, and the difference between the peak values of each turning pair was investigated. That peak value difference was subsequently corrected by the offset from the intended vehicle altitude at turn initiation from the actual altitude at initiation. The corrected amplitudes were investigated and grouped into six validated actionable guidance principles that can be given to pilots to immediately reduce their acoustic footprint during operations.


Development and Validation of Generic Maneuvering Flight Noise Abatement Guidance for Helicopters

  • Presented at Forum 76 - Best Paper for this session
  • 16 pages
  • SKU # : F-0076-2020-16488
  • Winner of the Alfred Gessow Best Paper Award at Forum 76
  • January 2021 Paper of the Month.

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Development and Validation of Generic Maneuvering Flight Noise Abatement Guidance for Helicopters

Authors / Details: James H. Stephenson, US Army CCDC AvMC
Michael E. Watts, Analytical Mechanics Associates Inc.
Kyle A. Pascioni, NASA Langley Research Center
Eric Greenwood, Penn State University