Research On The Collision Simulation And Front Structure Crashworthiness Optimization Of Aluminum Train

At present, the railway enters a new period of development, with the improvement of thespeed, the collision safety of the train has become one of the key issues during the moderntrain research, how to improve the train collision crashworthiness is one of the core issues inthe design of train safety. In this paper a aluminum alloy carbody is taken as a carrier, usingthe collision simulation software PAM-CRASH to simulate the train’s large deformation,through analysis of the aluminum alloy car body’s structure plastic deformation, along withthe impact force and acceleration during the collision process to assess the safety of the train.Based on which, the multi-disciplinary optimization software called iSIGHT is adopted toconduct the single objective optimization and multi-objective optimization on the trainfront-end energy-absorbing structure, to develop a route of the train lightweight design, usingthe finite element simulation software to complete.First of all, the theory and key technologies used to analyze the aluminum alloy car bodycrashworthiness simulation are introduced, such as the basic mechanical equation, finiteelement theory, show integral algorithm and material, contact nonlinear algorithm and so on,also the pre-treatment is included, after processing software.Secondly, according to the structural characteristics of the aluminum alloy train body,the applicable finite element mode is built for the highly nonlinear collision analysis. Theanalysis of the impact simulation is experimented in four conditions in the basis of on theEN15227：2008standard, which is the car hits the variable obstacles, two head-on train’scollision, eight link train hits the variable obstacles and two columns of eight link traincollision. And then, according to the collision simulation result, collect the analysis of theseries changing parameters in main components. Those consists of the plastic deformation,body energy absorbing effects, body impact force, impact duration of action and the velocity,acceleration from each part. Then the evaluat ion of crashworthiness of the body is got, aswell as the raised improvement scheme at last.Thirdly, in order to analyze the driver and passenger response in the vehicle collisionprocess accurately, four dummies are added in the mode on the basis of the ECE, EEC andFMVSS standards. The deformation mode of the dummy, the size of the force andacceleration are taken to analyze the degree of injury of the dummy. The key factors resultingin the dummy injuries caused in the collision process have been proposed to provide a basisfor the safety of the design.Finally, based on the analysis of the simulation results and under the premise of ensurethe passenger’s safety, with the software PAM-CRASH and iSIGHT, as well as the suitable optimization algorithm to dentermine the reasonable energy absorbing structure parameters,and reach the aim of minimizing the quality and maximizing the absorption of the energy.