Safety Assessment on Negotiation of Locomotive under the Condition of Traction

Considering the effect of the movement of wheel and rail and the traction force, the formula to calculate creepages between wheel and rail are given in this paper, and characteristics of wheel/rail dynamic interaction are studied on the basis of a theory of vehicle-track coupling dynamics, and the safety on negotiation of the locomotive with the traction is investigated and assessed in detail. Many theoretical results show that under the condition of the traction, the value and the direction of the creep force in longitudinal can be changed, when a locomotive passes through a curved track with a speed of 140 km/h and a radius of 1600 m, some of safety indices, including the derailment coefficient and the wheel/rail lateral force, are up to their limits, it is suggested that the traction power should be no higher than 4500 kW from the point of view of safety according to the railway vehicle specification for evaluation of dynamic performance and accreditation test in Chinese Railway.