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

Calculation according to AzB Method

The calculation is based on the guideline AzB "Guidance for the calculation of noise protection areas at civil and military airports according to the German act on aircraft noise (Fluglärmgesetz, dated 30 March 1971)". There the calculation of the energy-equivalent sound pressure level Leq is based on the model that the highest sound level L and noise duration t are only dependent on the flight and acoustic data that is characteristic for each aircraft as well as the distance s, the angular height alpha and the arc length sigma (see fig. b: section along line P-U).

 

The distance s is the distance of the aircraft from the immission point P when flying over point U. The angular height alpha is the angle which - on flying over point U - includes the straight-line connection of the aircraft and the immission point P with the reference plane. The arc length sigma is the distance between the foot F of the perpendicular dropped on the flight route from immission point P and the runway reference point PB, measured along the flight route (see fig. a: projection onto reference plane).

With growing distance s, the sound level L decreases while the noise duration t increases. If the angular height alpha is small, the sound-absorbing ground causes a reduction in sound level L. The arc length sigma is relevant as the engine power and the flight speed can change along the flight route. With rising engine power, the sound level L increases while with rising flight speed, the noise duration t decreases.

Calculation Settings

  • Parameter of half-value switchable q=4 or q=3
  • Several procedures for integration of air corridor
  • Free input of reference time interval
  • Calculaton result: Leq (La and Lb) or Ld/Ln (separate calculation for day and night)
  • Optional consideration of receiver height
  • Maximum level statistics with editable level range and class width
  • Calculation of the number of exceedings above a defined threshold