The noise level at a given receiver induced by starting and landing aircraft is a function not only of the general laws of noise propagation but also of the model of aircraft, e.g. its weight, size, motor, speed and so on. Furthermore, the starting or landing direction of the aircraft is of great importance.

IMMI, which is field-proven by several hundred users world wide, helps in managing this complex task by providing acoustics calculation algorithms implemented in a convenient and easy-to-use environment.

Aircraft noise calculation methods:

• European method: ECAC. CEAC Doc. 29
• National German methods: AzB/AzB-L and DIN 45684
• National Austrian method: ÖAL 24

• Definition of landing and takeoff runways
• Modelling of flight routes, helicopter routes and traffic circuits according to the DES system
• Input of flight movements for day, evening and night
• Emission data base included
• Calculation of Lden, Lday, Levening, Lnight, Lday(16h), NAT, Nawr (study of DLR concerning awakening reaction)
• Flight path width can be optionally displayed in the scheme
• 2 wake-up reaction criteria according to Jansen and Griefahn

IMMI supports the standard data-acquisition system for airports and airfields, which significantly simplifies and speeds up data preparation and input, making simulation and frequent calculation of reception points with new input data extremely facile and fast! IMMI comes with the Austro-German noise emission database, which is tightly integrated into the data-acquisition systems for airports.

For further information see Log-In area.