A time-domain method for the simulation of dynamic interaction between a vehicle and a curved railway track, accounting for wheel-rail excitation in a wide frequency range (up to several hundred Hz), has been presented. The simulation model is able to capture the low frequency vehicle dynamics simultaneously due to curving and the more high-frequency track dynamics due to excitation by short-pitch corrugation on the low rail. Structural flexibility of wheelsets and track is accounted for. To reduce the computational effort, a wheelset model including a flexible (in bending and torsion) wheel axle, rigid wheels and a rigid driving disc was calibrated versus a more detailed FE-model. Good agreement between the two models was observed for eigenmodes not including a considerable deformation of the wheels or the driving disc. Further, the vehicle model was reduced to include only one bogie. The influence of the rest of the vehicle (including the low-frequency vehicle dynamics) on the studied bogie was accounted for by pre-calculated loop-up tables of forces and moments acting on the secondary suspension. Based on rigid-body simulations in GENSYS, using a full vehicle model of a Bombardier C20 trainset negotiating a 120 m radius curve at speed 35 km/h, it was concluded that the largest wheel-rail contact forces occur at the leading bogie of the second car. Consequently, this bogie was modelled in DIFF3D. Assuming a rigid track model to make the two simulation models as similar as possible, good agreement was observed between the results calculated in DIFF3D and GENSYS. This serves as a validation of DIFF3D. The features of DIFF3D were demonstrated in several numerical examples. For a discrete rail irregularity excitation on the low rail of the curve, it was shown that all included wheelset eigenmodes contributed to the transient response at the wheel-rail contacts. Further, for the tangential wheel-rail contact force at the low-rail contact, it was found that a velocity-dependent friction coefficient induced an excitation of the first anti-symmetric mode in torsion of the wheelset while the vehicle was negotiating the studied curve. The application of driving moments on the two wheelsets was also examined. An impulse excitation was obtained by introducing a discrete irregularity on the high rail. At the low-rail contacts, the spectra of the tangential contact force showed increased magnitudes at distinct frequencies corresponding to the second symmetric mode in bending and the first symmetric mode in torsion of the wheelset. An increased magnitude was also observed at the P2 resonance.


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    Title :

    Simulation of dynamic vehicle-track interaction on small radius curves


    Contributors:


    Publication date :

    2011


    Size :

    22 Seiten, 13 Bilder, 3 Tabellen, 37 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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