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Noise Prediction for Maneuvering RotorcraftThis paper presents the initial work toward first-principles noise prediction for maneuvering rotors. Both the aeromechanical and acoustics aspects of the maneuver noise problem are discussed. The comprehensive analysis code, CAMRAD 2. was utilized to predict the time-dependent aircraft position and attitude, along - with the rotor blade airloads and motion. The major focus of this effort was the enhancement of the acoustic code WOPWOP necessary to compute the noise from a maneuvering rotorcraft. Full aircraft motion, including arbitrary transient motion, is modeled together with arbitrary rotor blade motions. Noise from a rotorcraft in turning and descending flight is compared to level flight. A substantial increase in the rotor noise is found both for turning flight and during a transient maneuver. Additional enhancements to take advantage of parallel computers and clusters of workstations, in addition to a new compact-chordwise loading formulation, are also described.
Document ID
20000075259
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Brentner, Kenneth S. (NASA Langley Research Center Hampton, VA United States)
Jones, Henry E. (Army Aviation and Missile Command Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Acoustics
Report/Patent Number
AIAA Paper 2000-2031
Meeting Information
Meeting: 6th Aeroacoustics Conference
Location: Lahaina, HI
Country: United States
Start Date: June 12, 2000
End Date: June 14, 2000
Sponsors: National Oceanic and Atmospheric Administration, American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Public Use Permitted.

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