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You are here: Products > CadnaA > Extensions > FLG - Aircraft Noise > ECAC Calculation Method

Calculation according to ECAC Doc. 29 Method

The segmentation procedure described in ECAC Doc. 29 has been nominated as interim method by the EC-environmental noise directive. Noise contours for the noise indicators Lden and Lnight can easily be calculated using Option FLG. The method is based on the guideline "European Civil Aviation Conference Document 29" (ECAC Doc. 29), "Report on Standard Method of Computing Noise Contours around Civil Airports", 2nd edition, 1997 (adapted to the requirements of the EC-directive according to AR-INTERIM-CM "Adaptation and Revision of the Interim Noise Computation Methods for the Purpose of Strategic Noise Mapping", March 2003). The method applies as with AzB ­ aircraft group concept with acoustical and flight power data resulting from tabulated data. The method differs from the AzB method as the partial level of all segments of an air route contributes to the overall A-weighted level at a receiver point and not just the segments where the perpendicular from the receiver point exists.

 

 
According to ECAC Doc. 29, the air route is modeled by straight lines each with constant thrust and air speed (with the minimum segment length of 3 m). The shortest distance d from the air route to the receiver point is used to describe the distance of that segment. It results from the perpendicular distance l between receiver point and ground track, the aircraft height h at this point, and the climb angle gamma of the segment.

The proportion of sound energy, inciding at the receiver point from each route segment, is defined by the aspect angle the segment appears when looking from the receiver. The proportion by each segment decreases with decreasing aspect angle. The total immission is given by the energetic sum of all emissions of all route segments.

Calculation Settings

  • Editable grid factor
  • Max. difference of levels for segmentation editable
  • Definable rules for segmentation of curves
  • Free input of reference time interval
  • Optional consideration of receiver height