| 摘要 |
Disclosed is an aircraft noise analysis method based on a natural cutoff frequency, the method being capable of obtaining reference equivalent noise according to a reference cutoff frequency with respect to aircraft sample noise in a target region, and setting, as a natural cutoff frequency of the target region, a minimum cutoff frequency from among cutoff frequencies having equivalent noise within an error range of the reference equivalent noise. The method comprises the steps of: (a) receiving, as an input, aircraft sample noise; (b) obtaining a first filtering signal by filtering the aircraft sample noise using a low frequency filter according to the reference cutoff frequency; (c) obtaining reference equivalent noise by calculating equivalent noise with respect to the first filtering signal; and (d) detecting a minimum cutoff frequency having equivalent noise within a predetermined error range in the reference equivalent noise, and setting the detected minimum cutoff frequency as a natural cutoff frequency. The aircraft noise analysis method can distinguish background noise and aircraft noise by reflecting the altitude, season, and temperature and humidity of the location where a sound receiving device is installed, and thereby can measure the aircraft noise more accurately. |
