The paper describes the multibody model of a railway bogie roller rig, with particular attention on the simulation of the contact force between the wheel and the roller. The contact model was derived from previous study in which a semi-analytic solution was developed, that allows to obtain reliable and accurate results with reasonable computational resources. The contact problem analysis is important in the design of full scale and scaled roller rigs, since it may influence control performance and system stability. In the paper the contact model will be briefly described and some numerical simulation will be presented and discussed.
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