Kramer F., Waubke H.

In order to assess and prevent noise emmission in the environment of traffic routes, prognosis models for wave propagation are of interest for many applications. Guided by experience in railway traffic simulation, this contribution introduces a new model for wave propagation and simulation in layered orthotropic media. The model uses a component-wise Fourier transform to obtain the general solution within one layer; by a variation of constants, this yields the solution within a loaded layer. Then, balances at layer boundaries are used to derive the solution at the layer boundaries. Thus, a grid of stress resp. displacement vectors is obtained, and back transformation is performed. The model has been tested on physical accuracy concerning the splitting of layers, on numerical accuracy and stability under pertubation. The results are presented. Some ideas on implementation and acceleration are presented as well.