Variability of flyover noise measures for repeated flights of turbojet and piston engine transport aircraft
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4000 Minimum Slant A-level aircraft flyover noise Aircraft Noise altitude Beranek and Newman composite perceived noise data analysis degree of variability discrete frequencies Distance in feet effective perceived noise flight path flyover noise measures FLYOVER SIGNAL DURATION FOUR-ENGINE PISTON AIRCRAFT FOUR-ENGINE TURBOJET AIRCRAFT frequency weighting networks FUNCTION OF MINIMUM half-second intervals humidity l0 dB l0 log level flight flyovers linear regression log I antilog MAXIMUM A-WEIGHTED SOUND MAXIMUM TONE-CORRECTED PERCEIVED measurement position measurements during repeat measures are compared MEASURES FOR REPEATED MINIMUM SLANT DISTANCE N-levels N-WEIGHTED SOUND LEVELS NASA noise level measures NOISE LEVELS PNLC octave band spectra one-third octave band perceived noise level PISTON AIRCRAFT FIGURE PNLM PNLTM range from 0.3 reflecting signal duration repeat flyovers repeat runs rH rH show the degree SLANT DISTANCE Figure sound pressure levels Spectrum Analyzer TONE-CORRECTED PERCEIVED NOISE turbojet transport aircraft VARIABILITY IN FLYOVER VARIATION IN MAXIMUM Various flyover noise