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A MATHEMATICAL MODEL TO PREDICT THE DYNAMIC VERTICAL WHEEL/RAIL FORCES ASSOCIATED WITH LOW RAIL JOINTS

Ali Nadir Arslan, L Novoseletsky

Abstract

The magnitudes of transient vertical wheel/rail forces, known as the P sub 1 and P sub 2 forces, respectively, resulting from a vehicle's passage over isolated low rail joints are very large in comparison with static wheel/rail loads. In this study, a mathematical model was developed to predict the vertical wheel/rail forces and the forces between a locomotive's suspended traction motor and associated truck frame. A parametric study to investigate the influences of various input and system parameters on these forces was conducted using the model. It was also shown that a simplified first order model is sufficiently accurate to predict vertical wheel/rail forces.

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Key concepts: Truck, Traction (geology), Structural engineering, Parametric statistics, Tractive force, Bogie, Engineering, Mathematical model