The conventional modelling of the railway vehicle, in which it is considered as a system of rigid bodies connected by viscoelastic elements, yields accurate enough results in the low-frequency range (up to 20 Hz, approximately). However, when it comes to analysing the dynamic interaction of the vehicle and the track in the mid- and high-frequency ranges (when studying problems such as corrugation) the use of these simplified wheelset models may lead to inaccurate results. This is due to the fact that in these frequency ranges the structural dynamics of the wheelset cannot be neglected. Accordingly, in these cases a more realistic wheelset model able to reproduce the elastic behaviour of the rotating wheelset should be adopted. In the present work a model of flexible shafts is adapted for modelling the railway wheelset. The dynamic properties of the solid are obtained from a solid finite element model of a real wheelset. The model adopts an Eulerian coordinate set for numerical efficiency. Results of the crossed-receptance and mobility functions are presented, where the excitation is the vertical wheel-rail contact force and the displacement (or velocity) is measured in the wheel-rail contact plane. These results let us know that the gyroscopic effect may contribute to define the wavelength-fixing mechanism in some corrugation problems, even if the train speed is low.
Dynamic model of a railway wheelset for corrugation problem analysis
2008
12 Seiten, 7 Bilder, 17 Quellen
Conference paper
Storage medium
English
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