Track irregularities can excite vibrations of the train axles. There is concern that interaction between the vibrations of different axles, through waves propagating in the near subsurface, can give rise to strong vibrations or even instabilities. In order to model this interaction mechanism, a two-dimensional model is studied where each wheel is represented by a rigid, two-dimensional strip. The dynamical behavior of the train itself is represented by a damped mass-spring system. Due to the fact that the subsurface is assumed to be a homogeneous half-space and a two-dimensional scalar formulation is used, only qualitative conclusions can be drawn from the model presented here. In order to be able to draw more quantitative conclusions, the model should be extended with the presence of a track structure and the presence of layering in the subsurface. The interaction is expected to be much stronger in the case of a soft weathered layer overlying a faster half-space. In that case, one would expect that much more vibration energy would remain trapped in the upper layer. In the current model, most energy is radiated into the half-space without contributing to the interaction between the axles. Nevertheless, it seems that interaction between train wheels and subsurface vibrations can result in an increased vibration of the mass-spring systems. In principle, the method presented here can be extended to the case of a layered half-space by considering the appropriate Green function. This is one of the current topics of investigation. Also, the case of supercritical train speed is being considered at the moment.
Dynamic interaction between train wheels and the subsurface
Dynamische Wechselwirkung zwischen den Eisenbahnrädern und dem Gleisunterbau
Journal of Sound and Vibration ; 247 , 5 ; 917-926
2001
10 Seiten, 6 Bilder, 11 Quellen
Article (Journal)
English
Eisenbahnrad , Gleis , Untergrund (Erde) , Wechselwirkung , dynamisches Verhalten , Fahrzeugachse , Schwingungsanregung , Wellenausbreitung , Instabilität , Modelluntersuchung , Streifen , Masse (physikalische Größe) , Feder (Federungselement) , Dämpfung , Halbraum , Schicht (nach räumlicher Anordnung) , Green-Funktion
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