An 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.
NASA/AHS rotorcraft noise reduction program - NASA Langley Acoustics Division contributions
Vertiflite ; 35
1989-06-01
Sonstige
Keine Angabe
Englisch
The NASA/AHS Rotorcraft Noise Reduction Program
NTRS | 1988
|NASA Langley flight test program
NTRS | 1991
|NASA Langley Flight Test Program
NTIS | 1991
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