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 blade-vortex 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
The Vertical Flight Society's 76th Annual Forum & Technology Display ; 2020 ; Virginia Beach, VA, US
Aufsatz (Konferenz)
Keine Angabe
Englisch
DEVELOPMENT AND VALIDATION OF GENERIC MANEUVERING FLIGHT NOISE ABATEMENT GUIDANCE FOR HELICOPTERS
British Library Conference Proceedings | 2020
|Aeroelasticity of Helicopters in Maneuvering Flight
British Library Online Contents | 1994
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