Taking the stainless steel double-deck passenger car as the research object, the structure of the anti-collision column at the cab end of the passenger car is evaluated and verified by tests. According to the evaluation criterion of CFR title 49, part 238, three kinds of elastic-plastic test schemes of anti-collision column are put forward and compared based on the results of dynamic simulation. The cab end anti-collision column structure is designed and elastic-plastic impact test is carried out to test the impact speed, rebound speed and displacement of each vertical height of the anti-collision column, and calculate the energy absorption. By analyzing the test data and comparing with the evaluation criteria, it is shown that the anti-collision column design meets all the design requirements. Then the finite element model and modeling method of anti-collision column are verified based on the test data, and the comparative analysis of test data and simulation data shows that the results are in good consistency, which provides a credible basic model for further research.

In this article, a new double-tapered rectangular tube (DTRT) with diaphragms is introduced as an energy absorber. The material tensile test and impact test were performed to verify the finite element model (FEM) of the tube. Based on the FEM, the Box-Behnken design (BBD) was applied to study the effects of diaphragm geometry on energy absorption (EA) and specific energy absorption (SEA). The weld length between the diaphragm and tube wall has positive effects on the EA and SEA of the DTRT, whereas the hole size on the diaphragms has negative effects. The optimal solution improved the EA and SEA by 12.01% and 9.29%, respectively. The conclusions of this study are based on engineering practice and are expected to aid engineers in designing the diaphragms of tubes as energy-absorbing structures.

This paper proposes a variable stiffness collision post (VSCP) structure based on a uniform stiffness collision post (USCP) structure and performs stiffness matching optimization for VSCPs. A collision post structure assembled in a subway front-end frame can maintain the living space and absorb a certain amount of the kinetic energy of an impact. The experiment was applied on USCP, and the finite element model was verified experimentally. To investigate the effects of the stiffness parameters of VSCP on the specific energy absorption response (SEA_VSCP) and the area of intrusion response (S_In), response surface models fitted from design of experiment were adopted with the finite element model. In addition, a multiobjective optimization design was realized by using the global response search method and a Pareto frontier sequence was generated, which was based on the developed response surface model. It was found that the optimal value of SEA_VSCP and S_In responses cannot be achieved at the same time. Finally, a grey relational analysis is propounded to attain a desirable balance between SEA_VSCP and S_In from the Pareto frontier sequence under constraints of the peak crash force of VSCP and energy absorption of the front-end of cab car. The optimization result shows that the crashworthiness of VSCP is better than that of USCP.

通过对世界先进的焊接结构疲劳寿命评估方法及当前常用疲劳分析标准的广泛研究,采用网格不敏感结构应力MSS计算方法技术,及主S-N曲线数学模型(Master S-N),将EN15085标准规定的设计流程通过编程实现人机交互,开发了基于EN15085标准的软件系统平台.本文将介绍新型焊接结构抗疲劳设计平台—WELD-CODE计算原理及功能模块,并通过一个算例证明该平台的准确性.

基于冲击试验和仿真实验手段对带隔板方管吸能结构的碰撞力学响应特性进行分析,建立有限元模型,采用显式动力有限元ANSYS/LS-DYNA进行数值仿真,并与试验结果对比,误差基本稳定在5％以内,验证该数值仿真模型的有效性.研究结果表明:结构变形模式为稳定可靠的轴对称模式.研究隔板结构与诱导结构对吸能特性的影响,得出结构在隔板的约束下产生更多的屈曲褶皱,吸能量提高17％.诱导结构对结构整体吸能量影响不大,可以显著降低结构的初始撞击力峰值,降低百分比达到42.3％.

以160 km/h新型中速磁浮交通列车铝合金车体为研究对象,介绍了该磁浮交通列车车体的断面、结构及材料,利用有限元分析软件着重对车体强度、刚度进行仿真计算,对车体的静强度进行了试验验证.通过有限元仿真计算和静强度试验,验证了该磁浮铝合金车体满足EN 12663标准对车体结构的要求.

本文从三个案例分析出发,论述了车体结构大致相同的情况下,不同的焊缝布置方法对其结构强度影响的差异.在此基础上,提出要在结构设计中将布置焊缝的区域有效避开结构的应力集中区域以及高应力区,以满足车体强度的要求.

For raising FEM model pre-processing efficiency of 25 Type passenger train car body,This paper constructs model library of 25 type passenger train car body adopting modularization and parameterization technology through teasing the pedigree of 25 type passenger train car body structure,and develops simulation template of 25 type passenger train car body basing on HyperMesh;and develops 25 type passenger train car body parameterization simulation system through integrating model library and simulation template of 25 type passenger train car body. This system can construct geometry model of 25 type passenger train car body rapidly through module choice and parameter variation, and construct FEM model for ANSYS and ABAQUS through simulation template rapidly. The FEM pre-processing time of 25 type passenger train car body is shortened to about one week adopting this system,which raises FEM model pre-processing efficiency greatly.

作为关键的人机界面部件和承载部件,高速列车车体在列车高速运行过程中承受着复杂多变的力学问题,容易产生应力集中区域,并造成强度问题和疲劳问题.若利用刚度协调策略,通过改进车体断面及局部结构,可以使应力幅值有较大幅度的降低.文章对刚度协调策略在高速列车车体结构优化设计中的应用进行了探讨.

本文利用I-DEAS 11 NX有限元分析软件对某出口内燃动车组中间车车体进行了有限元分析,参照具体规范考虑不同工况,进行了静强度、刚度及模态分析,根据计算结果对车体结构进行评价并给出建议.

Considering the crash design of 100% low floor LRV and EN 15227 《Crashworthiness requirements for railway vehicle bodies》,vehicle crash simulation and analysis are conducted to offer a theoretic basis for railway vehicle structure crashworthiness design and obtain crashworthy vehicle structure.

针对出口米轨内燃动车组头车车体,采用有限元分析法进行车体静强度仿真分析及模态分析,依据计算结果对车体结构进行优化,并在样车完成试制后开展了车体静强度、模态及平稳性测试,进一步验证了车体设计的安全、可靠及舒适性.

The middle car body of a new generation high-speed EMU is studied.A finite element analysis model is constructed using software Hypermesh,and the model data is imported into ANSYS software to obtaine solutions.The static mechanic behaviors of the middle car body under some typical load cases are analyzed,and the evaluation of static strengthen is determined.The dynamic stiffness evaluation is presented by comparing the results of numerical simulation of natural vibration modal with approximate theory,which provides an effective reference for practical design and structural optimization of the car body.