SUBJECTIVE EVALUATION OF GENERAL AVIATION AIRCRAFT NOISE.
WYLE LABS INC HUNTSVILLE ALA RESEARCH STAFF
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An experiment was conducted, in a progressive wave field, in which a group of subjects evaluated the noisiness of recorded general aviation aircraft sounds in comparison to jet transport flyover noise. The aircraft studied were piston engined, turboprop and turbojet aircraft in the weight range 2000 to 13,000 lbs. Twenty-eight noise rating scales were evaluated and it was found that of currently used scales, Perceived Noise Level, corrected for pure tone content, gave the best correlation with the subjective results. For the signals studied, duration appeared to have little influence on the subjective noisiness of flyover sounds. By comparing the results for a number of simulated flyover sounds it was concluded that an explanation lies in the influence of the Doppler frequency shift, which tends to cancel the effects of duration. A Doppler correction for current noise rating methods is presented which generally improves their correlation with observed results. Author
- Transport Aircraft