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

Calculation according to DIN 45684-1 Method

The calculation is based on the standard DIN 45684-1 "Determination of aircraft noise exposure at airfields, Part 1: Calculation method" (in German, draft 2004-03). The method applies as with AzB ­ aircraft groups with acoustical and flight power resulting from tabulated data. The method is applicable to ultra light aircraft, motor-powered sailplanes, props and jets with a maximum take-off weight of up to 20 tons and for helicopters with a maximum take-off weight of up to 10 tons.

The calculation assumes a moving point source, the sound power and speed of which is known along the flight track. The individual air routes are considered as line sources which are segmented according to known rules and replaced by point sources. The air routes are modelled by straight line segments. The segmentation applies a raster factor of 0.5 considering that the emission from adjoining segments should not differ by more than 1 dB.

The calculation of propagation follows the rules specified in ISO 9613-2.

Calculation Settings

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