Effects of Crash Dynamic Parameters of Urban Rail Transit Train on Climbing Behavior

Abstract

[Objective] In order to strengthen the passive safety design ability of urban rail transit trains during operation, it is necessary to study the effects of train crash dynamics parameters on climbing behavior. [Method] Based on the vehicle-track coupling crash dynamics model, Hertz contact theory and rigid nonlinear connection model, a three-dimensional train crash dynamics simulation platform is built. Speed, acceleration and maximum wheelset lift are selected as comparison parameters, and the finite element model of train crash is used to verify the precision of the three-dimensional dynamic model of train crash. Based on the established simulation platform, some important parameters of the train structure are selected to study their effects on the wheelset lift. Five relatively more sensitive parameters, including the vertical distance from the installation points of the devices such as energy absorbing anti-climbing device, head car coupler, middle car coupler to the barycenter of the car body, the mass of the car body, the height of the barycenter of the car body, the vertical stiffness of the secondary suspension device and the vertical stiffness of the primary suspension device, are screened out to analyze the sensitivity of the above parameters to the train crash dynamics. [Result & Conclusion] Based on the finite element model of train crash, the precision of the three-dimensional dynamic model of train crash meeting the requirements is verified. The sensitivity analysis shows that when the parameter ratio varies within the range of 0.8~1.0, the five sensitive parameters of sensitivity is in the sequence of the vertical stiffness of the secondary suspension device, the mass of the car body, the height of the barycenter of the car body, the vertical distance from the installation point to the barycenter of the car body, and the vertical stiffness of the primary suspension device. When the parameter ratio varies within the range of 1.0 to 1.2, the above parameters of sensitivity is in the sequence of the vertical stiffness of the primary suspension device, the vertical distance from the installation point to the barycenter of the car body, the height of the barycenter of the car body, the mass of the car body, and the vertical stiffness of the secondary suspension device.

Keywords

• urban rail transit
• train crash
• dynamic parameters
• climbing behavior