22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-3.9.3

THE INFLUENCE OF MODELLING A-SYMMETRIC LATERAL TRACK DISPERSION ON AIRCRAFT NOISE LEVEL PREDICTIONS

F. J. M. Wubben, M. E. S. Vogels, H. B. G. ten Have
National Aerospace Laboratory NLR, the Netherlands

Keywords: lateral track dispersion, aircraft noise, fanomos

In the Netherlands, noise exposure forecasting is based on the assumption that lateral track dispersion, for both take-off and landing, can be represented by a symmetrical probability distribution. Radar track observations at Amsterdam Airport Schiphol (AAS) show that the actual track dispersion is certainly not symmetrical. As a result, forecasting noise exposure calculations can give rather large differences in noise load compared with noise exposure calculations based on the actual tracks. An a-symmetric lateral track dispersion model is presented, using three tracks per flight route. Two-dimensional analysis shows that the model gives a better correlation of the calculated noise levels using modelled and actual tracks.

view full paper