The Simulation Of Subway Train Coupling Collision And Analyses Of Energy Absorption Property

In the application period, the train will suffer great longitudinal impact force in the condition of shunting operation, coupling, braking and crash. With the change of speed and passenger load, the train is highly risky, especially in the condition of coupling and crash.In order to ensure the enough safety of passengers in the severe impact condition of metro train, the designers must advance an effective crashworthiness strategy that incorporated into the design of passenger railcars. Crash Energy Management (CEM) is widely adopted in the structural design of crashworthiness train. The energy absorption equipment is engineered to collapse in a controlled manner and dissipates the collision energy step-by-step. This approach manages dissipation of the collision energy more effectively and efficiently than conventional railcar designs.This energy absorption strategy is the basis for the collision dynamics simulation of metro train. The collision dynamics model developed for this thesis serves two roles:to explain the events of a CEM train-to-train crash and develop a tool for evaluating other collision conditions and equipment variations. The first role is accomplished and demonstrated through comparison and analysis of results from collision dynamics simulation. In order to accomplish the second role, the nonlinear force element in SIMPACK is used for the impact dynamics simulation of the buffer, collapse tube, coupler shear device and energy absorption structure. The collision dynamics simulation includes simulation and evaluation of crashworthiness performance of energy absorption equipment in more complex collision conditions by changing impact speed, vehicle mass and railway.The paper not only have simulated the impact and crash scene of metro train, but also researched how the impact speed, wheel-rail friction coefficient and coupler contact stiffness impact on the crash of metro train and energy absorption equipment. The research and conclusion contribute to more effectively control of metro train impact and optimizing design of energy absorption equipment. The paper analyses the energy absorption feature of energy absorption equipment and process of characteristic curve optimizing detailedly. The method how to simulate the energy absorption equipment in SIMPACK is also included in the paper.