The FAA Integrated Noise Model (INM) is in general use for characterizing aircraft noise near airports. This model has been improved repeatedly, but it has still some problems awaiting solution. So this paper introduces a culculation system of aircraft noise.
We made a survey of noise and flight path in the surrounding of Osaka International Airport, and found that dispersions in flight track, height, and normarized noise level (power level) were normal distribution in each aircraft type. In this culculation method, noise level on the ground is simulated by using normal random numbers which have standard deviations calculated from survey date of three elements.
We drew out forecast contour for WECPNL around Osaka Intrrnational Airport, and compared survey and culculation values. Good agreements are found between these two values.
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