Abstract：Abstract：Research purposes： The influence of profile parameters on the travelling comfort and safety of the LIM train should be determined. Based on the data of LIM metro system at Capital Airport Express, a three- dimensional train-line coupling dynamic model was established. The dynamic response characteristics of LIM metro system under the influence of profile parameters and train speed were analyzed. The fitting relation formula between the maximum vertical acceleration, the maximum vertical wheel rail force, the maximum wheel load reduction rate, vertical curve type, vertical curve radius and train speed were obtained. Research conclusions： (1)The concave vertical curve will increase the vertical acceleration of the train and the vertical force of the wheel and rail, and reduce the wheel load reduction rate.(2)The convex vertical curve will reduce the vertical acceleration of the train and the vertical force of the wheel and rail, and increase the wheel load reduction rate.(3)The maximum vertical acceleration of the train, the maximum vertical force of wheel and rail, the maximum wheel load reduction rate are related to the reciprocal of curve radius.(4)The maximum vertical acceleration of the train, the maximum vertical force of wheel and rail, the maximum wheel load reduction rate are related to the square of vehicle speed.(5)The research results can provide the theoretical basis for the optimization of LIM metro system′s profile parameters.
2018, Vol. 35 
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