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Helicopter impulsive noise - Theoretical and experimental statusThe theoretical and experimental status of helicopter impulsive noise is reviewed. The two major source mechanisms of helicopter impulsive noise are addressed: high-speed impulsive noise and blade-vortex interaction impulsive noise. A thorough physical explanation of both generating mechanisms is presented together with model and full-scale measurements of the phenomena. Current theoretical prediction methods are compared with experimental findings of isolated rotor tests. The noise generating mechanisms of high speed impulsive noise are fairly well understood - theory and experiment compare nicely over Mach number ranges typical of today's helicopters. For the case of blade-vortex interaction noise, understanding of noise generating mechanisms and theoretical comparison with experiment are less satisfactory. Several methods for improving theory/experiment are suggested.
Document ID
19870024497
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Schmitz, F. H.
(NASA Ames Research Center Moffett Field, CA, United States)
Yu, Y. H.
(NASA Ames Research Center; U.S. Army, Aeromechanics Laboratory, Moffett Field CA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Acoustics
Accession Number
87A11771
Distribution Limits
Public
Copyright
Other

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