Crashworthiness Design And Optimization Of Energy Absorption Structure

As the rapid development of rail transportation technology,the passive safety of vehicles has become one of the key problems in current researches.A basic solution is to design a car body with good crashworthiness.This article aims to optimize the energy-absorption structure of telos and to evaluate vehicle crashworthiness of both front and end car body before and after the optimization by numerical simulation technology,based on the concept of vehicle passive safety design with studying the Aluminum Alloy metro vehicle.Firstly,this paper expounds the background and significance of the passive safety design of researching on railway vehicle.It contains a briefly introduction of simulation researches of vehicle collision and an introduction of the basic principle and the key technology of simulation method.Secondly,a finite element model of the railway locomotive is built to study the distribution of energy absorbing beam of telos energy-absorption structure by OptiStruct software.Referring to the four-order of vehicle collision energy absorption,the thesis validates four kinds of energy-absorption structure with energy absorbing characteristics of PAM-CRASH collision simulation software.Thirdly,using Isight integrated large deformation simulation software PAM-CRASH to optimize the front of optimal energy-absorption structure.For one and the same optimization target,when the weighting factors take different values,observe the influences of weighting factors on the optimization results.As a better result achieved,combine the result with OptiStruct on the two levels of energy absorbing beam for topology optimization.It not only realizes the body lightweight design but also further enhances the impact performance of metro vehicles.Finally,Referring to the EN 15227:2008 standard,the Aluminum Alloy metro vehicle original structure and the optimized structures are respectively analyzed,which based on the standard that a moving train with 25km/h impacts a static one.From the longitudinal collision results in average speed,wheel uplift and living space index of two times the results,to evaluate the crashworthiness of train over all.This research shows that the reasonable change of the energy-absorption structure,and followed by a size and topology optimization could improve the absorption performance of energy structure in a certain degree and could achieve the purpose of improving vehicle passive safety.With studying on this thesis,there is a certain significance to future passive safety of railway vehicles.