Research On Passive Safety And Crashworthiness Optimization Of CRH3 EMU

With the acceleration of urbanization and the overall speed of China's railroad, how to improve the operation safety and reduce high-speed train accident loss, realize modern vehicles people-oriented design ideas, minimize drivers and passengers in the accident casualties has become one hot topic of railway vehicles research. In this paper, CRH3 EMU as a carrier, application of PAM-CRASH crash simulation software and multi-disciplinary collaborative optimization software iSIGHT for crash simulation analysis and optimization of energy-absorbing structures obtains CRH3 EMU collision deformation in large deformation and the force and acceleration conditions of passengers, and energy-absorbing structure for assessment and optimal design, to achieve of passive safety protection and crashworthiness optimization of the vehicle.Firstly, according to the structural characteristics of CRH3 EMU, a suitable highly non-linear finite element model is established. Based on the simulation results of the train hitting the wall and the two vehicles on the touch, the deformation of the major components, absorption between vehicle and vehicle, the impact force, time, speed, acceleration and a series of changes of parameters are analyzed to propose the improvement plan.Secondly, energy-absorbing structures have been installed. Two conditions of the train hitting the rigid wall and the two vehicles on the touch are simulated to compare the degree of deformation, speed, acceleration, energy and force with non-energy-absorbing structure, to analyze energy-absorbing structure on the impact of body, to provide advice for the design.Thirdly, the relatively accurate Couplers - Buffer - Coupling System model is established. CRH3 EMU is used hinged connection and semi-automatic coupler connection and analyzed and compared the process of deformation, speed, acceleration, force, energy, etc. A theoretical basis for the enterprise is provided.Fourthly, five dummies are added. According to FMVSS, ECE and EEC, the damage index of dummy is evaluated and the key factors in the human body have been proposed in order to provide a basis for the safety of the design.Finally, PAM-CRASH is integrated with iSIGHT. Based on Sequential Quadratic Programming and Mixed Integer Optimization and under the premise of the lower quality and the safety of personnel, the reasonable energy absorbing structure parameters are determined in order to absorb the impact energy enough to ensure the safety of personnel.