Research On The Special Energy-absorbing Structure Of Mass Transit Vehicles

States have adopted the three-dimensional rail transport to ease the worsening traffic problems in cities.Based on security considerations,the impact safety research on the mass transit vehicles,has became the hot topic in all countries of the railway sector.As an important part of the crashworthy energy absorbing car-body,the special energy absorption device will consumpt most of the impact energy in the vehicle collision,achieved security of the passengers,so researchers have been extensively studied.Based on the analysis of traditional mass transit vehicles special crack energy absorption device, according to the principle of metal cutting process will consume a large amount of kinetic energy,a new-style of energy absorbing device in metal -cutting way is researched.By the software ANSYS/LS-DYNA,the cutting energy-absorbing strcture finite element model had designed.and the affect of the number of cutting tools,cutting depth on the energy asorption is analyzed in detail.According to the numerical simulation,the change of the cutting depth and set offload system on the key locations can control the peak of the cutting force,and two shapes of the cutting cross-section shape and three types of offload systems had been used in the utting energy-absorbing strcture.Compared with the crack energy absorption device under the same conditions,both two energy-absorbing devices had the similar force-time curve,which can provides a theoretical support for the use of the cutting energy-absorbing device;the peak of the cutting force in lower than the crush-type device;change cutting depth had proved to be a useful method to control the energy absorption;set offload systems on the key locations can be significantly reduced the peaks of the cutting force.The results of this paper can provide reference for further research of the cutting energy absorption,and give guidance to the application of the special energy absorption device.