Effects of Duration and Other Noise Characteristics on the Annoyance Caused by Aircraft-Flyover Noise

摘要

A laboratory experiment was conducted to determine the effects of duration and other noise characteristics on the annoyance caused by aircraft-flyover noise. The exper¬iment was unique in that the duration, Doppler shift, and spectra were individually controlled by specifying aircraft operational factors, such as velocity, altitude, and spectrum, in a computer synthesis of the aircraft-noise stimuli. This control allowed the separation of the effects of duration from the other main factors in the experimental design: velocity, tonal content, and sound pressure level. In the experiment, 48 test subjects judged the annoyance of a set of noise stimuli which were comprised of factorial combinations of 3 durations, 3 velocities, 3 sound pres¬sure levels, and 2 tone conditions. The judgments were made by using a graphical scale procedure similar to numerical category scaling. Each of the main factors except velocity was found to affect the judged annoyance significantly. The inter¬action of tonal content with sound pressure level was also found to be significant. The duration correction used in the effective-perceived-noise-level procedure, 3 dB per doubling of effective duration, was found to account most accurately for the effect of duration. No significant effect of Doppler shift was found.