An Algorithm for the Aircraft Noise Forecast Contours Retrieving along Discrete Points on the Circuler Arcs

Abstract

A new algorithm for retrieving aircraft noise exposure forecast contours to minimize cost of the computation is proposed. The iterative technique of this algorithm distinguished from others is to seek for the contour point along circuler arcs on which dummy points for computation are settled with discrete radii and directions. Computational tolerance ⊿L is preferable to be set as 0. 05dB<⊿L<0. 1dB, besides the initial values γ_0 of retrieving radius should be 250m. As a result, it has been proved that CPU time to retrieve a contour is reduced by a large margin with small computational errors less than 0. 5% in comparison with the reference noise impact area.