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NASA/AHS rotorcraft noise reduction program - NASA Langley Acoustics Division contributionsAn account is given of the contributions made by NASA-Langley's rotorcraft noise research programs over the last five years. Attention has been given to the broadband and blade-vortex interaction noise sources; both analytical and empirical noise-prediction codes have been developed and validated for several rotor noise sources, and the 'Rotonet' comprehensive system-noise prediction capability has been instituted. Among the technologies explored for helicopter noise reduction have been higher harmonic control and active vibration-suppression.
Document ID
19890053678
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Martin, Ruth M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: Vertiflite
Volume: 35
ISSN: 0042-4455
Subject Category
Acoustics
Accession Number
89A41049
Distribution Limits
Public
Copyright
Other

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