Aircraft noise

Careful planning based on noise calculations can make it possible to increase air traffic and at the same time reduce people's annoyance at their homes.

Limiting the noise from air traffic

Air traffic is increasing, but at the same time noise from individual aircraft has currently been reduced. The overall effect is that noise level from airports for at long period has been decreasing, but it is not sure that this trend will continue. Airports and aircraft manufacturers have a common interest in limiting the noise from air traffic. This will both meet the requirements of local environmental authorities and create a positive response in the local community.

Is it enough just to measure and calculate?

DELTA measures and calculates the noise from aircraft and airports. We can give advice on environmental adjustments in cases where take-off and landing procedures have to be altered to meet the terms of the approval by the environmental authorities:

• Calculation of noise from existing and future traffic at airports, airfields and airbases
• Advice on environmental adjustments
• Advice on airport noise control
• Measurement of aircraft noise

Aircraft noise calculations are characterized by a need for special knowledge and interest in traffic operations at an airport or airfield. You need to know the various aircraft types and their characteristics as well as the way they operate, if you are to determine the noise exposure with any great accuracy.

DANSIM

DELTA has developed a simulation program called DANSIM (Danish Airport Simulation Model), which is able to calculate the airport noise exposure based on the actual or expected traffic, the flight track system and the topography around the airport.

We know what we are talking about

For over 40 years, DELTA has been providing advice to aircraft manufacturers, airports and authorities about aircraft noise. Credibility is the key, and DELTA has around 30 acousticians at its disposal, all with their unique knowledge. We are accredited by DANAK to carry out measurements and calculations in all branches of acoustics.

Billund Airport: Expansion of traffic and approval from the environmental authorities

The airport at Billund wished in 1990th to increase the number of its operations. The requirement from the environmental authorities was that the increase in traffic must at most affect a limited number of homes in the 55 dB noise exposure zone. 55 dB is the environmental limit of an airport.
Using DANSIM, DELTA simulated a range of alternatives for Billund Airport, such that it was not necessary to restrict the number of flights. The simulations demonstrated that it is possible to meet the noise requirements by changing the take-off procedure. By getting jet aircraft to perform a 30 degree right turn at a height of 450 feet before continuing towards their destination, it was possible to reduce the number of homes affected by the noise from 671 to 301.