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A study of the effect of flight density and background noise on V/STOL acceptabilityA study was conducted in which test subjects evaluated the sounds of a helicopter, a turbofan STOL and a turbojet airplane while engaged in work and leisure activities. Exposure to a high repetitive density of the aircraft sounds did not make the individual sounds more annoying but did create an unacceptable environment. The application of a time duration term to db(A) resulted in a measure which compared favorably with EPNL as a predictor of annoyance. Temporal variations in background noise level had no significant effect on the rated annoyance.
Document ID
19740006652
Document Type
Contractor Report (CR)
Authors
Sternfeld, H., Jr. (Boeing Vertol Co. Philadelphia, PA, United States)
Hinterkeuser, E. G. (Boeing Vertol Co. Philadelphia, PA, United States)
Hackman, R. B. (Boeing Vertol Co. Philadelphia, PA, United States)
Davis, J. (Boeing Vertol Co. Philadelphia, PA, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
AIRCRAFT
Report/Patent Number
D210-10662-2
NASA-CR-2197
Funding Number(s)
CONTRACT_GRANT: NAS1-11607
PROJECT: RTOP 504-29-11-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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NameType 19740006652.pdf STI