Crash Simulation Of Urban Rail Vehicle And Study Of It’s Crashworthiness

With the rapid development of railway transportation and increasing of the train speed in recent years, the safety of rail vehicle operation has strongly attracted public attention. Therefore, crashworthy rail vehicles designed in terms of the concept of “people-centric” has become new developing trend of rail vehicles. And those have become the hot issues in development of crashworthy rail vehicles that researching on how to improve the crashworthiness and protect the safety of passenger and integrity of car body structure, from the viewpoint of the passive safety protection, in further strengthening the train active safety protection measures and reducing the occurrence of the collision.Taking the course of urban rail vehicle head car impacting the fixed rigidwall as the research object, firstly, the crash course of basic energy absorbing elements which compose the vehicle energy-absorbing device with different parameters(including material, crosssection shape and size, conical degree of cone-shaped tube, etc.) were simulated by using the ANSYS/LS-DYNA, the effects of above parameters to their crashworthiness were studied, laying the foundation for choosing the energy absorbing device of better performance.Secondly, by simplifying the urban rail vehicle head car reasonably, the equivalent geometric model is setted up in Solidworks. Saving the corresponding file format and importing it into HyperMesh, the K files for LS-DYNA to solve are generated by allocating unit size, meshing, imposing the constraints and loads, setting the material, property and the control parameters such as contact way, hourglass, timestep, etc.Thirdly, by using the LS-DYNA, the processes were respectively simulated of urban rail vehicle head car, with and without anti-climbing energy absorption device, impacting the fixed rigid wall face to face at the speed of 12.25km/h and 18km/h. According to the simulation results, the crashworthiness evaluation parameters of two head car were compared. The results show that, when the crash speed is respectively at 12.25km/h and 18km/h, the energy absorption device would absorb impact energy before car body structure by plastic deformation, protecting the car body without and with only a little plastic deformation.Finally, by using the Workbench, the anti-climbing energy absorption devices in urban rail vehicle head car were crash simulated, and the factors influencing anti-climbing ability of anti-climber were studied. The results show that, when the total height and tooth thickness of anti-climber are fixed, its anti-climbing ability would decrease as the tooth height and angle increases, and the tooth height has more influence than the angle.