An Optimization Design Of A Circular Nanometer Train Anti-creepage And Energy Absorption Structure

With the rapid development of the rail transit industry in recent years,more and more people take it as the first choice of travel mode,but at the same time,people’s fast driving and safe driving requirements are more and more strong.At present,the actual fastest operation speed of the high-speed railway has reached 350 kilometers per hour.Once the train collides at such a speed,the consequences will be unimaginable.Active safety protection measures of rail train are important means to ensure the safety of train and passengers,but if we want to ensure the safety of train and passengers,we have to pay equal attention to the development and application of passive safety protection measures,which is of great significance to the improvement of the safety performance of track vehicles in China.In this paper,the anti-crawler device,an important part of passive safety protection technology,is used as the starting point,and the types and structural principles of several kinds of anti-crawler are briefly introduced.Based on the finite element software ANSYS the impact model pretreatment is carried out.On the original elastic-plastic square shell,the influence of the wall thickness of the square shell,the impact velocity of the drop hammer and the length of the square shell on their energy absorption properties is discussed by changing the structure of the other shell.Secondly,the finite element model of the original elastoplastic square shell,the circumferential local surface nanocrystalline square shell and the full nanocrystalline square shell under axial impact load is established,and the analytical solution is carried out by using the display kinetic analysis software ANSYS/LS-DYNA.Several key evaluation indexes are compared.Thirdly,by giving different circumferential surface nanocrystalline density to the square shell,the crashworthiness parameters of the shell under different nanocrystalline density are compared,and the effect of nanocrystalline density on the energy absorption performance of the other shell is obtained.Finally,the influence of zonal nanocrystallization on the energy absorption performance of the original elastic-plastic square shell is expanded and analyzed,which enriches the content of simulation analysis,and also provides a new idea for the improvement of the energy absorption performance of the energy absorption part of the crushed anti-climbing device.