Abstract
A laboratory experiment was conducted to quantify the annoyance to advanced turboprop aircraft flyover noise. A computer synthesis system was used to generate 45 realistic, time‐varying simulations of propeller aircraft flyover noise in which the harmonic content was systematically varied to represent the factorial combinations of five fundamental frequencies ranging from 67.5 to 292.5 Hz, three frequency envelope shapes representing helical tip Mach numbers of 0.63, 0.73, and 0.78, and three tone to broadband noise ratios of 0, 15, and 30 dB. In the experiment, 64 subjects judged the annoyance of recordings of the 45 synthesized flyover noises presented at D‐weighted sound pressure levels of 70, 80, and 90 dB in a testing room which simulates the outdoor acoustic environment. Analyses of the judgments examine the effects on annoyance of the differences in the harmonic content of the flyover noises. The annoyance prediction ability of various noise measurement procedures and corrections is also examined.
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