Research On Crashworthiness Of A B-type Subway Train Based On EN15227 Standard

The punctuality,speedability and comfort of rail vehicle make it the preferred travel method for citizens,and its rapid development reflects the progress of China’s Railway Science and technology.However,from the perspective of the actual train operation process,affected by inevitable factors such as natural environment,human errors and machine failure,train operation safety problems still occur from time to time.One of the most serious problems is train collision accident.Train collision accidents will seriously threaten the safety of life and property of the crew and passengers,and cause considerable losses to the national economy.Based on the collision contact analysis technology of LS-DYNA,according to EN15227: 2008 《 Railway Applications Crashworthiness Requirements for Railway Vehicle Bodies》,this paper studies the relative collision of a domestic B-type stainless steel subway train at 25 km / h.The specific research contents are as follows:(1)Introducing the background and significance of the research on passive safety of rail vehicles,elaborating the development status and evaluation standard of the research on the collision resistance of domestic and foreign rail vehicles;(2)Elaborating the basic principles and key technologies,and introducing research methods of rail vehicles crashworthiness;(3)In the conceptual stage of subway vehicle design,the rapid analysis method of energy allocation of rail vehicle is applied to quickly determine the compression stroke and energy absorption sequence of each energy absorbing element during the collision of the subway vehicle,so that to determine the effectiveness of the performance parameters of the energy-absorbing components of the train;(4)After knowing the three-dimensional model of the subway train,considering that the cab skeleton and the anti-climbing device absorb enerrgy together during the collision,the finite element model of the cab skeleton impacting rigid wall is established,and the force-stroke curve of the first energy-absorbing interface is integrated to optimize the energy distribution.The scheme ensures the accuracy and effectiveness of the collision energy distribution of the subway train;(5)Using the Hyper Mesh software to establish the train collision finite element model,and the LS-DYNA software is used to solve the analysis,so that the three-dimensional certification of the collision energy absorption of the rail vehicle is completed.The results show that the evaluation indexes such as train collision speed,crushing stroke,driver’s cabin living space,train body deformation and average deceleration all meet the standard requirements,which verifies the accuracy and feasibility of the energy-absorbing scheme ofB-type stainless steel subway train.This paper introduces an effective and feasible method applied to train crash simulation analysis,from the energy distribution in the scheme design stage to the 3D train crash simulation,which provides theoretical guidance for the subsequent crashworthiness design of rail vehicles.