Fundamental study on safety of vehicle running on steep curve at low speed

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When a railway vehicle is running on a steep curve section, the wheel flanges of the outside wheel are prone to ride on the rail top surface. In this study, a simulation method for numerical analysis of a railway vehicle running on a curved track with short radius at a relatively low speed is developed and some numerical examples are shown. It is concluded that the small difference between the relative longitudinal velocity of the right rail and that of the left rail generated by the turning motion of the vehicle plays an important role in the numerical analysis, and that the dropping of the wheel from the rail top may occur, in the case that the static wheel load of vehicle holds a large unbalance number and the friction at the contact surface between the wheel and the rail reaches to a certain high value.