Subjective Field Study of Response to Impulsive Helicopter NoiseNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Helicopters - 40 pages |
Common terms and phrases
9 10 Extremely A-weighted sound pressure ability of EPNL Acoustic Data aircraft noise Aircraft Type airport communities annoyance potential appendix blade slap noise Buzzing Swishing Thumping combined experiments CTOL dB Figure descriptors Droning Buzzing Buzzing ECF2 effective impulsiveness correction effective perceived noise effects of impulsiveness Extremely Noisy flight-path conditions FLYOVER EVENTS flyover noises FM recorders frame house Hammering Extremely Noticeable judgments of impulsiveness Langley Research Center level flight Main rotor measure of impulsiveness Moderately Noticeable multiple regression NASA noise certification noise measures outdoor and indoor outdoor judgments outdoor subject groups perceived noise level PNLT SEL EPNL predictive ability propeller-driven airplane proposed impulse corrections psychoacoustic RATING SHEET regression analyses Residual noisiness rotor speed scale second experiment Sideline distance Slapping Hammering Extremely Slightly Noticeable sound pressure level Standard error subjective data subjective judgments subjective noisiness judgments subjects were assigned Swishing Thumping Slapping Tail rotor Thumping Slapping Hammering trend Turboshaft variables