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This paper investigates the influence of the models of dry friction suspension component used in the numerical simulation of freight car dynamics on the possible predictions related to safety against derailment. Moreover, the performance of the models is compared on the basis of simulation runtime. Three groups of static and dynamic models of friction are selected as three different approaches which are often utilized in popular multibody simulation tools. The models are used for the centre bowl friction joint between the car body and bogies. The friction torque in the centre bowl affects the rotational resistance of the bogie in motion relative to the car body and consequently influences the interaction forces between the wheels and rails. Simulation results of safety against derailment index obtained from the vehicle curving scenario suggest noticeable differences in predictions of the selected models of friction.

Evaluation of bogie centre bowl friction models in the context of safety against derailment simulation predictions