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Should helicopter noise be measured differently from other aircraft noise? A review of the psychoacoustic literatureA review of 34 studies indicates that several factors or variables might be important in providing a psychoacoustic foundation for measurements of the noise from helicopters. These factors are phase relations, tail rotor noise, repetition rate, crest level, and generic differences between conventional aircraft and helicopters. Particular attention was given to the impulsive noise known as blade slap. Analysis of the evidence for and against each factor reveals that, for the present state of scientific knowledge, none of these factors should be regarded as the basis for a significant noise measurement correction due to impulsive blade slap. The current method of measuring effective perceived noise level for conventional aircraft appears to be adequate for measuring helicopter noise as well.
Document ID
19830005666
Document Type
Contractor Report (CR)
Authors
Molino, J. A. (Wyle Labs., Inc. Arlington, VA, United States)
Date Acquired
September 4, 2013
Publication Date
November 1, 1982
Subject Category
ACOUSTICS
Report/Patent Number
NAS 1.26:3609
WR-82-19
NASA-CR-3609
Funding Number(s)
CONTRACT_GRANT: NAS1-16276
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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