A necessary condition for complex simulations of vehicle system dynamics including drive dynamics and traction control when running on adhesion limit, is an advanced creep force modelling taking large longitudinal creep into account. A method presented in the paper allows to simulate various real wheel-rail contact conditions using one parameter set identified from measurements. Influence of vehicle speed, longitudinal, lateral and spin creep and shape of the contact ellipse is also considered. In order to test the possibility of simulating the dynamic change af traction torque, a test case used during the adhesion test of the four axle SBB 460 locomotive of the Swiss Federal Railways was simulated. In the course of curving simulation, the traction torque was increased from zero to the adhesion limit, in a similar way as during the adhesion test measurements. In this manner, a run on the unstable (decreasing) section of creep force curve was simulated with increasing tractive effort, the wheelset steering ability decreases. Simultaneausly, the first wheelset of the bogie moves to the inner rail. The calculated steering angle as a function of tractive force in the steering linkages is compared with measurements and confirms a good agreement in the tendency although the real track irregularity is not known in detail. In following examples, the creep force model described above was used in a co-simulation of vehicle dynamics and traction control under bad adhesion conditions. The vehicle model is represented by the locomotive 12X of BombardierTransportation (in service at the German Railways as DB 127) modelled in the simulation tool SIMPACK. The controller was modelled in computer code MATLAB-SIMULINK. As an application example, the traction control reaction following a sudden worsening of adhesion conditions was simulated. Another co-simulation study shows a starting and acceleration of locomotive hauling a train on a curved sloping track. The observed forces on the straight track and on the left and right curves are very close in measurement and simulation. The comparison validates the proposed method as suitable for computer simulation of traction vehicles running on adhesion limit.
Creep forces in simulations of traction vehicles running on adhesion limit
2003
7 Seiten, 8 Bilder, 1 Tabelle, 23 Quellen
Aufsatz (Konferenz)
Englisch
Creep forces in simulations of traction vehicles running on adhesion limit
British Library Conference Proceedings | 2003
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