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Comparison of advanced turboprop and conventional jet and propeller aircraft flyover noise annoyance: Preliminary resultsA laboratory experiment was conducted to compare the flyover noise annoyance of proposed advanced turboprop aircraft with that of conventional turboprop and jet aircraft. The effects of fundamental frequency and tone-to-broadband noise ratio on advanced turboprop annoyance were also examined. A computer synthesis system is used to generate 18 realistic, time varying simulations of propeller aircraft takeoff noise in which the harmonic content is systematically varied to represent the factorial combinations of six fundamental frequencies ranging from 67.5 Hz to 292.5 Hz and three tone-to-broadband noise ratios of 0, 15, and 30 dB. These advanced turboprop simulations along with recordings of five conventional turboprop takeoffs and five conventional jet takeoffs are presented at D-weighted sound pressure levels of 70, 80, and 90 dB to 32 subjects in an anechoic chamber. Analyses of the subjects' annoyance judgments compare the three categories of aircraft and examine the effects of the differences in harmonic content among the advanced turboprop noises. The annoyance prediction ability of various noise measurement procedures and corrections is also examined.
Document ID
19860007607
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mccurdy, D. A. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1985
Subject Category
Acoustics
Report/Patent Number
NASA-TM-87637
NAS 1.15:87637
Meeting Information
Meeting: Acoustical Society American Conference
Location: Nashville, TN
Country: United States
Start Date: November 4, 1985
End Date: November 8, 1985
Accession Number
86N17077
Funding Number(s)
PROJECT: RTOP 535-03-12-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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