The Influence of Track Stiffness on Track Dynamic Behaviour

Makoto ISHIDA Manager,Track Dynamics Laboratory, Fundamental Research Division
Shigeru MIURA General Manager,Track Technology Development Division, Technological Development Department
Akiko KONO Researcher, Track Dynamics Laboratory, Fundamental Research Division

Large dynamic forces act between wheel and rail due to rail surface irregularities at rail welds, wheel flats and others. The authors established a track dynamic model to understand track dynamic behaviour for the design of track and vehicle components. In the track dynamic model, rail is considered to have a distributed mass and to be supported discretely at sleepers above ballast divided into three layers, which can cover the dynamic track and vehicle behaviour in the high frequency range. This paper describes the influence of track stiffness on track dynamic behaviour caused by high speed trains running on track irregularities.