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CadnaA Webtutorial
Teach yourself the elements of CadnaA with the CadnaA Webtutorial. more
CadnaA Users
CadnaA is successfully applied in many different industries in more than 60 countries all over the world. more
Success Stories
Noise Mapping Austria
The strategic noise maps for all of Austria were calculated with CadnaA. more
Air Pollution Calculation
CadnaA with Option APL allows calculation, assessment and presentation of air pollutant distribution.Find more informationView typical applications
What is a usability function?
By reducing the sound power level per unit area (SPL") of an intended commercial area the so-called "usability" will be restricted more and more as only businesses with moderate or low noise emission can be accepted. Consequently, the usability decreases when reducing the maximumly acceptable SPL". The usability-function within Option BPL establishs a relation between the SPL" and the area-related usability in %.
For the noise emission being high the usability function shows a small slope. Lowering the noise emission will cause a relatively moderate decrease in usability. This function range is aimed for when applying an optimization strategy. Below the salient point of the approximation curve the usability decreases rapidly with decerasing noise emssion. This function range should be avoided during optimization.
With this concept the optimization procedure within Option BPL accounts for the individual requirements of local authorities and the public. The usability function is approximated by two lines. Thus, three emission values for each area have to be specified prior to an optimization process: the minimal SPL", the maximum SPL" and the SPL" at the salient point.