Theoretical Modeling of High‐Speed Helicopter Impulsive Noise
Abstract:A simple theoretical model of high‐speed helicopter impulsive noise, based on the Ffowcs Williams and Hawkings theoretical formulation, is developed. The model depends primarily on the large scale features of the rotor's aerodynamic flow field. For acoustic radiation near the rotor's tip‐path‐plane, monopole, dipole, and quadrupole sources all contribute—with the monopole term dominating for high subsonic advancing tip Mach numbers (
Document Type: Research Article
Affiliations: Aeromechanics Laboratory, U.S. Army Aviation R&D Command, Ames Research Center, Moffett Field, California, U.S.A.
Publication date: January 1, 1979
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