SPP 1015: Systemdynamik und Langzeitverhalten von Fahrwerk, Gleis und Untergrund

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The priority programme "System Dynamics and Long-term Behaviour of Vehicle, Track and Subgrade" contributes to a better understanding of the dynamic interaction of vehicle and track and the long-term behaviour of the components of the entire system. Recently encountered railway-related problems may be solved as a result of this research. So far, the approach has been to increase speed, traction and axle-load by optimising sub-systems. However, the entire system has revealed new limitations: settlement and destruction of the ballast and the subgrade lead to deterioration of the track; irregular wear of the wheels cause an increase in overall load and deterioration of passengers' comfort; damage of the running surfaces of the rail and the wheel becomes more frequent. The research is based on four main issues. Non-linear behaviour of the ballast is investigated experimentally in laboratories and simulated by new material-laws and multi-particle computer models. The coupling of the track model and the subgrade is defined using various methods. Phenomena occurring in the contact area of wheel and rail are numerically and experimentally analysed, also by using a 'virtual' measurement device on the moving train. Dynamic models of the entire system are thought to explain the phenomenon of polygonalisation of the wheels. It is expected that the interdisciplinary and fundamental research will result in physical explanations and subsequently will lead to technical developments which will guarantee long-lasting solutions.