CR-Fuxing high-speed EMU series

1Overview of the CR Fuxing high-speed EMUseries The independently developed CR(China Railways)Fuxing high-speed EMU(electric multiple unit)series by China currently comprises three speed-level product series:CR400,CR300,and CR200,as shown in Fig.1.The EMUs demonstrate adaptability to various geographical and climatic conditions,including high plateaus,extremely cold regions,strong wind and sandy environmental conditions,with a designed service life of 30 years.The 350 km/h speed level of the CR-Fuxing series primarily consists of two platforms,namely CR400AF and CR400BF,both of them are electric multiple units with distributed power.Each 8-car formation is configured with a 4M4T arrangement,divided into two traction units(Tc+M+Tp+M).

Investigation on influencing factors of wheel polygonization of a plateau high-speed EMU train

Purpose–This study aims to investigate the cause of high-order wheel polygonization in a plateau high-speed electric multiple unit(EMU)train.Design/methodology/approach–A series of field tests were conducted to measure the vibration accelerations of the axle box and bogie when the wheels of the EMU train passed through tracks with normal rail roughness after re-profiling.Additionally,the dynamic characteristics of the track,wheelset and bogie were also measured.These measurements provided insights into the mechanisms that lead to wheel polygonization.Findings–The results of the field tests indicate that wheel polygonal wear in theEMUtrain primarily exhibits 14–16 and 25–27 harmonic orders.The passing frequencies of wheel polygonization were approximately 283–323 Hz and 505–545 Hz,which closely match the dominated frequencies of axle box and bogie vibrations.These findings suggest that the fixed-frequency vibrations originate from the natural modes of the wheelset and bogie,which can be excited by wheel/rail irregularities.Originality/value–The study provides novel insights into the mechanisms of high-order wheel polygonization in plateau high-speed EMU trains.Futher,the results indicate that operating the EMU train on mixed lines at variable speeds could potentially mitigate high-order polygonal wear,providing practical value for improving the safety,performance and maintenance efficiency of high-speed EMU trains.

便携式车辆平稳性测量分析仪在动车组上的应用建议

随着智能化程度和对动车组的监控要求提高,复兴号动车组通过车载装置即可对车辆运行平稳性进行实时监控,本文基于中国和谐号动车组平稳性检测现状与实际需求,介绍了便携式车辆平稳性测量分析仪的使用情况,通过对便携式仪器与复兴号动车组车载平稳性装置测量数据的对比分析,结合便携式仪器使用经验,以减少对乘客的影响的同时提高便携式仪器所测数据的准确性为目的,最终提出了使用便携式车辆平稳性测量分析仪检测和谐号动车组平稳性的建议方案。

时速350km复兴号动车组司机登乘门研究

为了满足时速350 km复兴号动车组司机登乘门的技术要求,在既有CRH6型动车组司机室门的关键技术基础上,对登乘门门扇、门锁等关键部位进行改进设计,增强了门扇的强度,提高了隔音隔热性能。从登乘门的性能指标、总体结构、电气原理等方面对登乘门设计进行详细阐述,经过强度仿真计算、相关台架型式试验及装车运用考核,证明司机登乘门满足设计要求,保证了列车高速运行时车门的安全性,目前该车门已广泛应用在复兴号动车组上。

Analysis of vibration and frequency transmission of high speed EMU with flexible model

When the operation speed of the high-speed train increases and the weight of the carbody becomes lighter,not only does the sensitivity of the wheel/rail contact get higher,but also the vibration frequency range of the vehicle system gets enlarged and more frequencies are transmitted from the wheelset to the carbody.It is important to investigate the vibration characteristics and the dynamic frequency transmission from the wheel/rail interface to the carbody of the high-speed electric multi-uint（EMU）.An elastic highspeed vehicle dynamics model is established in which the carbody,bogieframes,and wheelsets are all dealt with as flexible body.A rigid high-speed vehicle dynamics model is set up to compare with the simulation results of the elastic model.In the rigid vehicle model,the carbody,bogieframes and wheelsets are treated as rigid component while the suspension and structure parameters are the same as used in the elastic model.The dynamic characteristic of the elastic high speed vehicle is investigated in time and frequency domains and the di ff erence of the acceleration,frequency distribution and transmission of the two types of models are presented.The results show that the spectrum power density of the vehicle decreases from the wheelset to the carbody and the acceleration transmission ratio is approximately from 1%to 10%for each suspension system.The frequency of the wheelset rotation is evident in the vibration of the flexible model and is transmitted from the wheelset to the bogieframe and to thecarbody.The results of the flexible model are more reasonable than that of the rigid model.A field test data of the high speed train are presented to verify the simulation results.It shows that the simulation results are coincident with the field test data.

Improved fault location method for AT traction power network based on EMU load test

The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power network.With the development of high-speed electrified railways,a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point(Q-L relation)is mostly nonlinear.Therefore,the linear Q-L relation in the traditional fault location method always leads to large errors.To solve this problem,a large number of load-related current data that can be used to describe the Q-L relation are obtained through the load test of the electric multiple unit(EMU).Thus,an improved fault location method based on the back propagation(BP)neural network is proposed in this paper.On this basis,a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method,respectively,which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network.Finally,combined with a shortcircuit test,the accuracy of the improved method is verified.

高速动车组被动式压力保护系统舒适性测试与优化

针对“复兴号”动车组在经过部分隧道多、海拔落差大的路线时出现乘客耳鸣及车体变形等问题,对西成线在线运营的“复兴号”动车组进行了实车跟踪测试,测试结果与理论分析结果一致,即当高速列车连续穿越海拔变化的隧道群时,为了保证车内压力处于相对稳定状态,压力保护阀长时间处于关闭状态。当列车驶出隧道后,因海拔高度和连续隧道的综合影响,车厢内外压差较大,若此时压力保护阀强制开启,列车内外压力在短时间内会迅速达到平衡,从而导致车内压力变化剧烈。文章采用数据分析的方法对被动式压力保护系统的开闭阀、强制开阀逻辑进行了优化,并通过增加泄压模式来降低车内外压差。经测试,优化后的车内1 s、3 s、10 s和60 s的最大压力变化率分别降低了68%、80%、83%和59%,远低于车内压力控制标准,人体感受较好,提高了乘客的乘坐舒适性和列车的运行安全性。

基于SLP的复兴号动车组关键部件生产车间布局优化研究

生产车间布局是否合理,影响着产品的生产效率、物流效率及生产成本。文中以某公司复兴号动车组关键部件生产车间为研究对象,基于SLP理论对车间布局现状进行了调研及问题分析,并对现状布局参数进行了计算分析,得出了该车间当前各功能区及物流量的相关性;进而综合分析各功能区域的物流关系及非物流关系,得出了该车间各作业单位的综合关系相关图及作业单位位置相关图,并采用以产品原则为主要布局特征,对车间布局进行了重新优化设计;通过新布局改善效果分析,该布局有效地降低了物流强度,提高了物流效率及生产效率,同时提高了生产面积利用率、降低了生产成本,使该车间生产布局更加精益合理。

CR400BF系列动车组速度传感器故障原因分析

为解决CR400BF系列动车组速度传感器故障问题,结合运行故障案例,通过现场调研、理论分析,制定多种研究方案,经过试验验证和现场运用考核,提出有效改善反馈信号的措施。

复兴号标准动车组高压电器箱结构强度仿真分析

基于复兴号标准动车组的主电路原理及车辆限界和空间要求,设计了集成多种高压电器且悬臂安装的高压电器箱,为校正和优化结构可靠性,建立高压电器箱有限元模型,进行结构模态分析和基于IEC 61373:2010的冲击强度及振动疲劳强度分析,得出高压电器箱前20阶模态振型和频率、冲击振动工况下母材和焊缝的应力分布以及振动疲劳工况下3向疲劳累计损伤情况,明确结构疲劳薄弱位置及各向加速度激励影响程度,并提出高压电器箱结构设计建议。

基于可靠性的无二次谐振回路牵引变流器电容优化设计

为保证电容器稳健可靠运行,文章以“复兴号”动车组牵引变流器为研究对象,对无二次谐振回路(简称“无二次回路”)牵引变流器的支撑电容器的基本设计思路进行了阐述,搭建了相应仿真模型,并基于该仿真模型提出了一种基于可靠性的无二次回路牵引变流器支撑电容器参数优化设计方法。其选取由制造、测量等因素引起的电容器容值偏差、网压存在的随机波动作为不确定性来源,以无二次回路牵引变流器中间电压的纹波系数作为约束函数,实现支撑电容器的参数优化设计,得到了更为稳健的电容器设计值,进一步保证了牵引系统的稳健可靠运行。最后,利用该电容器参数可靠性优化结果进行无二次回路牵引变流器设计及试验验证,结果显示,变流器中间电压波动在±5%以内,体积缩小了28.4%,重量减轻了28%,试验验证了该电容设计方法的有效性以及无二次回路牵引变流器的体积、质量优势。

复兴号动车组牵引系统参数分析

系统介绍了复兴号动车组牵引系统的基本结构,主要从四象限整流器控制、牵引逆变器控制、粘着利用控制、牵引变流器逻辑控制等功能做了详细的阐述,并结合牵引系统分析了牵引系统与制动系统的密切关系.

时速160 km动力集中动车组运营效益研究

文章对时速160 km动力集中动车组投入运营一年来的运量变化、客座利用率、票价收入等指标进行了研究,分析了拟开行区段的运营情况,对下一步集中动力车组购置运用提出建议。

高速铁路噪声控制技术进展与展望

我国高速铁路主要从动车组和基础设施两方面进行噪声控制,以降低高速铁路噪声影响。大西高铁综合试验段开展的自主化噪声控制技术测试表明:复兴号动车组车外主要噪声源仅集中在受电弓和轮轨区域,车头、车厢连接等车外噪声源已得到有效控制;复兴号动车组运行辐射噪声低于CRH380动车组运行辐射噪声1~2 dB(A),低于欧盟TSI及UIC等国际标准限值3 dB以上。声屏障顶端干涉技术附加降噪约2 dB,轨道吸声板平均降噪约2 dB(A),减载式声屏障与普通直立式声屏障降噪效果基本一致,有效降低声屏障表面气动载荷约15%。

高速铁路出站信号机设置标准研究

自2008年中国第一条时速350 km的京津城际铁路开通运营,我国高速铁路运营十年,为在大客流线路扩大运力开行17辆编组复兴号动车组,对运营需求提出更多要求,相关标准需要结合理论分析与试验进行修订。本文从《高速铁路设计规范》等标准修订背景与需求、标准现状等方面进行分析,针对开行440 m时速350 km复兴号动车组为目标,提出一种避免大规模站前改造工程下通过外移出站信号机的解决方案,并提出可供参考的出站信号机设置位置及增设分隔区段增加安全性的列车防护设计方案,最后针对该方案与现行标准协调问题提出建议意见。

Investigations on lubrication characteristics of high-speed electric multiple unit gearbox by oil volume adjusting device

In this paper,a numerical simulation model of the flow field in a gearbox with an oil volume adjusting device is established for the first time to study its influence on the lubrication characteristics of a high-speed electric multiple unit(EMU)gearbox.The moving particle semi-implicit(MPS)method is used to numerically simulate the internal flow field of the gearbox of the high-speed EMU under working conditions.The effects of the velocity of the high-speed EMU,the immersion depth,and the oil sump temperature on the power loss of the gears and the lubricant quantity of each bearing are studied and provide an effective tool for the quantitative evaluation of the lubrication characteristics of the gearbox.The lubrication characteristics of the gearbox under different working conditions are studied when the oil volume adjusting device is closed and opened.The results show that the oil volume adjusting device mainly changes the amount of lubricant stirred by the output gear by changing the flow rate of lubricant from the cavity pinion(Cavity P)to the cavity gear(Cavity G),and thus affects the power loss of gears and the lubricant quantity of each bearing.

复兴号高原双源动力集中动车组关键技术

为满足拉林电气化铁路和拉日非电气化铁路贯通运营需求,中国国家铁路集团有限公司组织研制了一款新型复兴号高原双源动力集中动车组。介绍线路环境及需攻克的内电一体化、内电双控、高原适应性等难题,重点阐述复兴号高原双源动力集中动车组整车关键系统方案和技术特点,可为后续动车组创新研发提供技术参考。

复兴号动车组RAMS特点分析

复兴号动车组在设计研发阶段充分考虑了RAMS需求,为动车组的可靠运用和高效维修提供了良好的技术基础。根据CR400AF/BF复兴号动车组的技术特点,逐一分析动车组的可靠性、可用性、维修性、安全性特点,主要包括定量指标及要求和为达到指标而采用的设计原则,并以实例解释设计原则的具体应用,最后提出动车组修程修制正向顶层设计的一点想法。

京沪高铁复兴号动车组350 km/h运营安全保障体系构建

为进一步发挥京沪高铁运输潜能、提升京沪高铁运营服务品质,从2017年9月21日起,复兴号动车组在京沪高铁率先实现350 km/h运营,在高速铁路已有安全保障体系的基础上,以中国铁路上海局集团有限公司为例,从设备、人员、管理、应急保障等方面,进一步强化构建京沪高铁复兴号动车组保障体系,以适应350 km/h动车组运行安全的需要。事实证明,该体系杜绝了责任行车事故,未发生严重影响运输秩序的设备故障,形成一套较完整的高铁动车组维护技术和运营管理模式,安全保障处于世界领先水平,保障体系的构建可为高铁运营达速线路安全对策提供参考。

复兴号服役动车组弓网受流性能数据跟踪采集方法研究

利用复兴号服役动车组配备的弓网监控系统,采用计算机视觉技术对弓网视频图像序列进行离线处理,智能识别接触线和受电弓滑板接触点,采集弓网燃弧图像,测量受电弓动态包络线数据,包括受电弓横向摆动量和动态抬升量。为长时间追踪服役动车组的弓网受流性能变化,掌握不同时期的弓网受流性能规律提供技术支持。