Simulation Of Vehicle Body Collision Safety Of EMU Head Car Body

In recent years,the world's rail transit industry has developed vigorously,but at the same time,it has also shown more and more problems.Among them,the safety issue is particularly prominent.The railway vehicle collision accident has caused major casualties and property damage,which has caused a high level of passengers and scholars from various countries Attention,how to improve the crashworthiness of trains and how to reduce the occurrence of train collision accidents,to maximize the protection of occupants and the integrity of vehicle structures,has become one of the key topics in modern rail vehicle design research.Based on this,the main research The research content is as follows.Based on the principle of energy equivalence,according to the structural characteristics of the aluminum alloy car body of this type of EMU,a finite element model of the head car body of the EMU that is suitable for collision is obtained.Car body model A collides with a rigid wall,simplified model B collides with a rigid wall,and the collision process of the same head car.Observe the transmission process of the collision and the changes in energy absorption,deformation,acceleration,etc.of the car body during the collision.The results meet the requirements of the EN15227 standard,and the collision results of the two car body models are not much different.The simplified model B can be used for collision simulation research.At the same time,the influence of the energy absorption structure on the collision parameters of the vehicle body is analyzed and compared.The results show that the energy absorption structure can improve the collision performance of the vehicle body.A new energy-absorbing structure with a cross-shaped partition in a traditional thin-walled square tube is proposed.The specific energy absorption,the peak of the collision force,and the compression force efficiency are used as evaluation indicators.The comprehensive energy absorption performance of thin-walled square tubes with partitions was evaluated.The results show that with the increase of the number of partitions,the comprehensive energy absorption performance of thin-walled square pipes continues to increase within a certain range,and the number of partitions reaches a certain value,which shows a downward trend.This shows that increasing the number of partitions can improve the energy-absorbing structure Energy absorption performance,but not the more the number of partitions,the better the energy absorption structure.With the continuous development of modern manufacturing technology,people have begun to use new parts with different mechanical properties.Also take the energy-absorbing structure with a partition as the research object,observe the impact of the length change of the gradient intensity of the energy-absorbing structure on the collision resistance,and use the response surface model to construct the specific energy-absorbing SEA and the specificenergy-absorbing and collision peak respectively.Compared with REAF's proxy model for designing the gradient length of the parameter,and optimizing it to obtain a more reasonable gradient length,the performance of the energy-absorbing structure is further improved.The results show that the energy absorption structure performance of the intensity gradient distribution is better than that of a single intensity energy absorption structure,and the size of the gradient length has a great influence on the energy absorption performance.