RAILROAD WHEEL CLIMB AND SLIDING. Technical Report # MBS2023-5-UIC

This paper discusses a recently introduced spatial dynamic formulation based on the assumptions of Nadal’s limit. The spatial analysis led to simple ratio and employed non-generalized coordinates to define a single-degree-of-freedom wheel-climb model that accounts for curving behavior. This model, which does not assume upward friction force, was used to develop an inverse problem to study different wheel climb patterns. It was shown that the spatial ratio can approach four if the direction of the friction force is properly accounted for, highlighting the need for accurate measurement of the relative velocity at the wheel/rail contact point.