Differences in mechanisms of noise generation and transmission between helicopter and fixed wing aircraft are examined; propeller noise consisting of rotational and vortex noise; basic procedures of acoustical treatments; external noise and factors influencing aural detectability of aircraft; techniques in controlling noise and development of Perceived Noise Level (PNdb); Port of New York Authority established 112 PNdb as maximum permissible outdoor level near flight path; helicopter and jet transport noise spectra for equal perceived noise levels are compared and it is predicted that helicopter noise levels will produce no real public disturbance; operational penalties.
Operational aspects of helicopter noise
SAE -- Paper
SAE Meeting ; 1964 Noise
1964
7 pages
Aufsatz (Konferenz)
Englisch
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Operational Aspects of Helicopter Noise
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