Engineering Models
Engineering models are used for a wide range of applications, among others for noise mapping. In order to also allow the calculation of huge projects in reasonable time compromises between accuracy and the calculation effort are necessary. Compared to the reference models, these models offer significantly better performance and require less memory.
Empa has a long tradition of developing technical models. Particularly noteworthy are the road and rail noise models StL86 and SEMIBEL from the 1980s, and the aircraft noise and shooting noise models FLULA2 and SL-90 from the 1990s.
The current generation of engineering models is labeled with son. The son family currently includes sonROAD18 for road noise, sonRAIL for railway noise, sonAIR for aircraft noise, and sonARMS for shooting noise. The models are spectrally formulated and have a uniform structure with a clear interface between emission and sound propagation. The models were developed for use in combination with Empa's sound propagation model called sonX. However, the emission models can also be linked to other propagation models, such as ISO 9613-2.
