According to EN 15227: 2020 Railway application-Crashworthiness requirements for rail vehicles, the collision simulation analysis of metro trains is generally carried out on straight lines, while the collision research on curved lines is relatively few. metro trains will also collide when running on curved lines, which leads to put forward the need of collision analysis on curved lines. Therefore, this paper studies the modeling method and simulation analysis of collision of metro trains moving on curves, and compares and analyzes the results of curve collision and straight collision, which provides reference for collision analysis of trains on curves.

文章通过模态分析获得不同内装等价分布方式下的车体侧墙振动的模态参数及模态振型,并建立符合车体侧墙模态参数和振动情况的有限元模型,将实测的空调基座加速度频域值作为激励,对有限元模型进行频率响应分析和瞬态响应分析,通过与试验结果对比验证了该模型的合理性.

阐述了地铁车辆高强度B型车车体结构各部件的轻量化措施,并通过有限元仿真及试验的方法对轻量化车体结构的静强度、稳定性、疲劳强度进行了分析.结果表明:通过轻量化研究,车体结构能够实现减重300 kg左右的轻量化目标,轻量化后的车体强度、稳定性、疲劳性能均满足相关标准和技术规格书的要求.

文章介绍了自主化研制的铝合金地铁车辆边梁悬挂平台研究的过程、边梁悬挂参数的确定、边梁悬挂车辆平台底架设备的安装结构,为该平台在车辆设计中的应用提供设计依据,同时为该平台后续升级优化提供参考.

介绍了国内某地铁项目铝合金A型车车体主要技术参数和各部件的结构优化设计,并通过有限元仿真的方法对车体结构的强度、刚度、稳定性、疲劳性能和耐碰撞性能进行了分析.结果表明该铝合金车体结构合理,车体各项指标均满足相关标准和技术规格书的要求.

In this paper,LS-DYNA simulation software is used to simulate 100% low-floor trams carbody collision scenarios, numerical methods are used to verify the performance of the vehicle’s collision passive safety.The finite element simulation model of low-floor carbody completed in Hypermesh software,calculation and post-processing work are done in LS-DYNA software.

In this article,a finite element impact model of two type B vehicles which were marshaled by six car bodies was established.Then this model was imported into LS-DYNA to carry out impact calculation.The plastic deformation of the head of car body and energy absorption by each section were analysed,then the change rule of longitudinal force of coupling and acceleration were also analysed.The result showed that this vehicle satisfied the requirements of impact provided by standard EN 15227 under the impact working conditions of 25km/h.

Because of ability to widely adapt to various of geological conditions and small effects to surroundings of buildings in construction,the bored pour pile is widely used.To ensure the quality of pile,it is more and more important to improve the detection precision of hole quality of bored pile.The construction equipment and key technology are introduced to detect the hole quality of bored pole in Zhengzhou Yellow River combined highway and railway bridge.By analyzing the reasons of affecting the detection precision of hole quality and the corresponding measures adopted in engineering practice,some empirical opinions are proposed on how to improve the detection precision of hole quality of bored pile in the sloughing formation of the Yellow River bed,which would provide a certain further reference to other similar project constructions.