Study On Static Dynamic Analysis And Collision Simulation For EMU Car Body

With the development of Chinese EMU towards high speed and the application of lightweight technology,the service conditions of the car body have deteriorated and the driving safety is affected.This also makes the EMU more serious in the event of a collision accident.Therefore,taking the EC01 body of CRH3 EMU as the research object,the static and dynamic characteristics analysis and collision simulation of the car body under the current manufacturing conditions are carried out in this paper.On the one hand,it lays the foundation for the safety operation and protection design of the EMU,on the other hand,it also provides reference for the basic scientific research and engineering design of the EMU car body.First of all,the finite element model of the large hollow extruded aluminum profile welding car body is established.On the premise of guaranteeing the calculation accuracy,based on“stiffness equivalent”is adopted to simplify the car body model in order to improve the calculation efficiency.Based on this,according to TB/T3451-2016,the static strength and stiffness of the car body were analyzed and checked in 14 operating conditions.The analysis results of static strength show that the maximum stress is less than the allowable stress of the material.The equivalent bending stiffness value of the body structure calculated from the central deformation of the car body is 2.25×10~9 N·m~2,which is greater than the specified value.The stiffness value meets the design requirements.Secondary,based on the finite model of car body,the modal reduction method is used to analyze the vibration frequencies and corresponding modes of each order of the vehicle body under different states.The results show that the first-order vertical bending vibration frequency of empty state is greater than 14Hz specified in JIS E 7106 standard and the first-order vertical bending vibration frequency of preparation state is greater than 10Hz specified in the TB/T3451-2016 standard.The dynamic response of vehicle body under vertical excitation force,longitudinal excitation force and lateral excitation force is analyzed respectively,and the maximum amplitude and corresponding frequency value are obtained.It provides the theoretical basis for the EMU to avoid the resonance damage caused by the lateral force,the longitudinal force and the vertical force in the dynamic design.Finally,the simulation analysis of the collision between two head cars of EMU is carried out.A three-dimensional model of EC01 car body collision is established.In order to improve the calculation efficiency,the quality of other vehicle bodies is simplified to the coupler junction of the two-bit end of the head car.On this basis,the collision simulation between the EMU and rigid wall,EMU and EMU is carried out according to EN15227-2010,and the variation rules of energy absorption,deformation,impact force and acceleration of different parts during vehicle collision are obtained.The results show that the car body meets the collision requirement and has the resistance to collision.The car body is optimized to improve the safety factor.