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Should helicopter noise be measured differently from other aircraft noise? A review of the psychoacoustic literature
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Author and Affiliation:
Molino, J. A.(Wyle Labs., Inc., Arlington, VA, United States)
Abstract: A 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.
Publication Date: Nov 01, 1982
Document ID:
19830005666
(Acquired Nov 13, 1995)
Accession Number: 83N13937
Subject Category: ACOUSTICS
Report/Patent Number: NASA-CR-3609, NAS 1.26:3609, WR-82-19
Coverage: Final Report
Document Type: Technical Report
Publisher Information: NASA, Washington, United States
Contract/Grant/Task Num: NAS1-16276
Financial Sponsor: NASA; United States
Organization Source: Wyle Labs., Inc.; Arlington, VA, United States
Description: 89p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: BLADE SLAP NOISE; HELICOPTERS; HUMAN TOLERANCES; NOISE MEASUREMENT; PSYCHOACOUSTICS; BLADE-VORTEX INTERACTION; EFFECTIVE PERCEIVED NOISE LEVELS; NOISE GENERATORS; NOISE PREDICTION (AIRCRAFT); TAIL ROTORS
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