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Active control of helicopter transmission noiseAn account is given of an effort to reduce helicopter transmission noise by 10 dB, using active methods, as part of the NASA-Lewis/U.S. Army Propulsion Directorate Advanced Rotorcraft Transmission technology integration and demonstration program. The transmission used as a test stand is that of the CH-47C forward rotor. Attention is presently given to the active control system's actuators, sensors, and control algorithms.
Document ID
19930045431
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Spencer, R. H. (Boeing Helicopters Philadelphia, PA, United States)
Burke, M. J. (NASA Lewis Research Center Cleveland, OH, United States)
Tye, G. W. (Noise Cancellation Technologies, Inc. Linthicum, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71)
Publisher: American Helicopter Society
Subject Category
Acoustics
Accession Number
93A29428
Funding Number(s)
CONTRACT_GRANT: NAS3-25421
Distribution Limits
Public
Copyright
Other

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