Measurement of noise exposure planar distribution in aircraft approach path vicinity

摘要

Japan Aerospace Exploration Agency is conducting a research project called DREAMS which aims to develop key technologies for future air traffic management systems which will enhance safety, efficiency, user convenience and environmental compatibility of flight operations. One of the research subjects in DREAMS is noise abatement flight technology. Its key element is an aircraft noise prediction model taking into account the effect of meteorological conditions on noise propagation. In order to verify the developed noise prediction model, noise measurement was conducted to obtain the planar distribution of noise exposure below the approach paths. The measurement area was about 4- by 4.4-kilometers and was divided into 110 (11×10) 400- by 400-meter grids. A GPS-synchronized multipoint noise measurement system was placed in every grid. The obtained results proved that the predicted instantaneous noise level and the noise exposure level were in good agreement with the measurement. The average and standard deviation of the noise exposure level prediction error calculated from 2543 data for Boeing 777-300ER were 0.41 dB and 1.50 dB, respectively.