Research On The Design And Application Of The Opposite Pull Friction Energy Absorption Structure For Urban Rail Vehicles

As an important part of the passive safety protection technology on trains,energy absorption structure can absorb vehicle kinetic energy and protect passengers’ life and property when a collision accident happened between two trains.In order to explore the energy absorption structure with excellent performance,a new friction energy absorption structure with split bolts is proposed by combining bolt connection structure with friction energy absorption principle in this paper.The friction energy absorption structure of split bolts is composed of anti-creeper and active friction plate,passive friction plate and mounting plate,split bolts and pedestal,etc.By resistance of bolts under tension due to the change in thickness of anti-creeper,this new EAS can absorb the kinetic energy through friction and the response speed of friction is very fast.The drop hammer impact test was carried out on the friction EAS with the element split bolt group,and an explicit dynamic finite element model was established for simulation analysis.The results show that the friction energy absorption structure with split bolts can absorb the collision kinetic energy stably during the collision process with ideal energy absorbing effect,and part of the structure can be reused.Then,the effects of initial collision velocity,the diameter of the working section of the split bolt,the diameter of the strengthening section,the length of the working section and the pre tightening force of the bolt on the energy absorption characteristics of the structure are studied by simulation analysis.Through orthogonal experimental design and nonlinear regression analysis,the response functions of the peak friction and energy consumption per unit length of the structure with respect to the diameter of the working section,the length of the working section and the diameter of the strengthening section of the split bolt are obtained respectively.Taking a typical B-type subway train as the research object,a complete set of opposite pull friction energy absorption device is designed.Under the constraint conditions,the optimal structural parameters of the split bolt of the opposite pull energy absorption device are obtained through the multi-objective genetic algorithm(MOGA),and the finite element modeling and simulation are carried out.The simulation results show that within the effective friction stroke,the energy absorption of the tension friction energy absorption structure is greater than 400 k J,which meets the basic energy absorption requirements,and the error with the optimized prediction value is within 5%.52 Figures,11 Tables,76 References...