This article presents a method for including a flexible rotating wheelset model for coupled train-track dynamic calculations. The wheelset model is based on a modal approach; it considers the real elastic and mass properties of the wheelset and the inertial or gyroscopic effects due to rotation. The modal properties are estimated through a FE model. The equations of motion of the wheelset adopt Eulerian coordinates, allowing low computational costs: the parameters in the formulation do not depend on time, and consequently they are calculated once at the beginning of the simulation. The calculation permit us to compare the rigid, the non-rotating flexible, and the rotating flexible wheelset approaches. The results from simpler models (rotating beam models) let us to predict that the main differences will be located at a discrete number of frequencies. Taking into account this conclusion, a wheelflat impact does not differ too much if the calculation is done through one model or the other, because the impact distributes the energy uniformly in the spectrum. The most important conclusion of the wheelflat calculations is that the rigid wheelset model overestimates the peek wheel-rail contact force. In a previous study, it was concluded that wheel-rail contact forces modelled by means of Hertz's law (Fc = KHdelta1.5) overestimate the wheelflat impact (the calculations compare results from the Hertzian model with those performed by employing a more realistic non-Hertzian contact model). These conclusions will contribute to fit theoretical results with practical measurements in automatic impact detectors installed on tracks. The most important differences appear when comparing results in corrugation calculations. For such problems, the rigid and the non-rotating elastic models may misinterpret the wavelength fixation mechanism.
High frequency railway vehicle-track dynamics through flexible rotating wheelsets
Berechnung hochfrequenter Rad-Schiene-Dynamik mit Hilfe flexibler rotierender Radsätze
Vehicle System Dynamics ; 46 , 7 ; 647-659
2008
13 Seiten, 6 Bilder, 2 Tabellen, 13 Quellen
Article (Journal)
English
Anwendung im Fahrzeugbau , Radsatz , Fahrzeugdynamik , dynamisches Verhalten , Eisenbahnrad , Simulationsmodellbildung , Simulationsmodell , Rechnersimulation , Eisenbahnfahrzeug , Eisenbahnschiene , Riffelbildung , Modalanalyse , Finite-Elemente-Methode , elastische Eigenschaft , Bewegungsgleichung , Kontaktkraft , Verschleiß
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