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Abnormal Vertical Dynamic Performance of Subway Vehicles

Chinese Journal of Mechanical Engineering 2010年第2期23卷 174-179页

作者： MA Weihua luo shihui SONG Rongrong Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China CSR Ziyang Locomotive Co. Ltd. Ziyang 641301 China College of Computer Science and Technology Southwest University for Nationalities Chengdu 610041 China

A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. More seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design.

关键词： subway wheel set tread out-of-round dynamic

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Stabilizing Mechanism and Running Behavior of Couplers on Heavy Haul Trains

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1211-1218页

作者： XU Ziqiang WU Qing luo shihui MA Weihua DONG Xiaoqing Traction Power State Key Laboratory Southwest Jiaotong University Locomotive and Car Research Institute China Academy of Railway Sciences Centre for Railway Engineering Central Queensland UniversityRockhamptonQueensland QLD4701Australia Locomotive and Car Research Institute China Academy of Railway Sciences

Published studies in regard to coupler systems have been mainly focused on the manufacturing process or coupler strength issues. With the ever increasing of tonnage and length of heavy haul trains, lateral in-train forces generated by longitudinal in-train forces and coupler rotations have become a more and more significant safety issue for heavy haul train operations. Derailments caused by excessive lateral in-train forces are frequently reported. This article studies two typical coupler systems used on heavy haul locomotives. Their structures and stabilizing mechanism are analyzed before the corresponding models are developed. Coupler systems models are featured by two distinct stabilizing mechanism models and draft gear models with hysteresis considered. A model set which consists of four locomotives and three coupler systems is developed to study the rotational behavior of different coupler systems and their implications for locomotive dynamics. Simulated results indicate that when the locomotives are equipped with the type B coupler system, locomotives can meet the dynamics standard on tangent tracks; while the dynamics performance on curved tracks is very poor. The maximum longitudinal in-train force for locomotives equipped with the type B coupler system is 2000 kN. Simulations revealed a distinct trend for the type A coupler system. Locomotive dynamics are poorer for the type A case when locomotives are running on tangent tracks, while the dynamics are better for the type A case when locomotives are running on curved tracks. Theoretical studies and simulations carried out in this article suggest that a combination of the two types of stabilizing mechanism can result in a good design which can significantly decrease the relevant derailments.

关键词： dynamic heavy haul train coupler systems stable mechanism coupler angle safety

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Longitudinal dynamics and energy analysis for heavy haul trains

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Journal of Modern Transportation 2014年第3期22卷 127-136页

作者： Qing Wu shihui luo Colin Cole Centre for Railway Engineering Central Queensland UniversityRockhamptonQueensland Australia State Key Laboratory of Traction Power Southwest Jiaotong University

Whole trip longitudinal dynamics and energy analysis of heavy haul trains are required by operators and manufacturers to enable optimisation of train controls and rolling stock components. A new technology named train dynamics and energy analyser/train simulator （TDEAS） has been developed by the State Key Laboratory of Traction Power in China to perform detailed whole trip longitudinal train dynamics and energy analyses. Facilitated by a controller user interface and a graphic user interface, the TDEAS can also be used as a train driving simulator. This paper elaborates the modelling of three primary parts in the TDEAS, namely wagon connection systems, air brake systems and train energy components. TDEAS uses advanced wedge-spring draft gear models that can simulate a wider spectrum of friction draft gear behaviour. An effective and efficient air brake model that can simulate air brake systems in various train configurations has been integrated. In addition, TDEAS simulates the train energy on the basis of a detailed longitudinal train dynamics simulation, which enables a further perspective of the train energy composition and the overall energy consumption. To demonstrate the validity of the TDEAS, a case study was carried out on a 120-km-long Chinese railway. The results show that the employment of electric locomotives with regenerative braking could bring considerable energy benefits. Nearly 40 % of the locomotive energy usage could be collected from the dynamic brake system. Most of tractive energy was dissipated by propulsion resistance that accounted for 42.48 % of the total energy. Only a small amount of tractive energy was dissipated by curving resistance, air brake and draft gear systems.

关键词： TDEAS Train simulation Longitudinal dynamics - Energy - Heavy haul

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Assessment of the curving performance of heavy haul trains under braking conditions

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Journal of Modern Transportation 2015年第3期23卷 169-175页

作者： Liangliang Yang Yu Kang shihui luo Maohai Fu Traction Power State Key Laboratory Southwest Jiaotong University School of Mechanical Engineering Southwest Jiaotong University

To study the curving performance of trains, 1D and 3D dynamic models of trains were built using nu- merical methods. The 1D model was composed of 210 simple wagons, each allowed only longitudinal motion; whereas the 3D model included three complicated wagons for which longitudinal, lateral, and vertical degrees of freedom were considered. Combined with the calculated results from the 1D model under braking conditions, the behavior of draft gears and brake shoes were added to the 3D model. The assessment of the curving performance of trains was focused on making comparisons between idling and braking conditions. The results indicated the following： when a train brakes on a curved track, the wheel-rail lateral force and derailment factor are greater than under idling conditions. Because the yawing movement of the wheelset is limited by brake shoes, the zone of wheel contact along the wheel tread is wider than under idling conditions. Furthermore, as the curvature becomes tighter, the traction ratio shows a nonlinear increasing trend, whether under idling or braking conditions. By increasing the brake shoe pressure, train steering becomes more difficult.

关键词： Heavy haul train · Curving performance ·Draft gear · Brake shoe · Wheel-rail · Derailment safetyWheel wear power · Traction ratio

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Experimental investigation on vibration characteristics of the medium-low-speed maglev vehicle-turnout coupled system

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Railway Engineering Science 2022年第2期30卷 242-261页

作者： Miao Li Dinggang Gao Tie Li shihui luo Weihua Ma Xiaohao Chen State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Maglev Transportation Engineering R&D Center Tongji UniversityShanghai 201804China City Rail Technical Development Department CRRC Dalian Locomotive and Rolling Stock Co.LtdDalian 116022China

The steel turnout is one of the key components in the medium–low-speed maglev line ***,the vehicle under active control is prone to vehicle–turnout coupled vibration,and thus,it is necessary to identify the vibration characteristics of this coupled system through field *** this end,dynamic performance tests were conducted on a vehicle–turnout coupled system in a medium–low-speed maglev test ***,the dynamic response data of the coupled system under various operating conditions were ***,the natural vibration characteristics of the turnout were analysed using the free attenuation method and the finite element method,indicating a good agreement between the simulation results and the measured results;the acceleration response characteristics of the coupled system were analysed in detail,and the ride quality of the vehicle was assessed by Sperling ***,the frequency distribution characteristics of the coupled system were *** these test results could provide references for model validation and optimized design of medium–low-speed maglev transport systems.

关键词： Medium–low-speed maglev Vehicle–turnout coupled system Field test Vibration characteristics Ride quality

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轨道车辆新型车端专用吸能装置

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西南交通大学学报 2013年第4期48卷 738-744页

作者：雷成肖守讷罗世辉西南交通大学牵引动力国家重点实验室四川成都610031 郑州铁路职业技术学院车辆工程学院河南郑州450052

为了提高轨道车辆的耐碰撞性,利用金属薄壁结构轴向切削和压缩过程吸收能量的原理,设计了一种新型车辆端部专用吸能装置;采用显式有限元软件LS-DYNA建立了吸能装置吸能过程的等效三维有限元模型,并对吸能过程进行数值模拟;分析了切削深... 详细信息

为了提高轨道车辆的耐碰撞性,利用金属薄壁结构轴向切削和压缩过程吸收能量的原理,设计了一种新型车辆端部专用吸能装置;采用显式有限元软件LS-DYNA建立了吸能装置吸能过程的等效三维有限元模型,并对吸能过程进行数值模拟;分析了切削深度、刀具前角和切屑圆心角等参数对吸能装置吸能性能的影响.研究结果表明,新型吸能装置吸收的能量、界面力与切削深度、切屑圆心角成正比,与刀具前角成反比,受切削深度的影响较小;新型吸能装置的冲程效率可达100%,压缩力效率和总效率可达70%以上,高于现有吸能装置.

关键词：轨道车辆切削和压缩专用吸能装置显式有限元

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磁悬浮轨道交通关键技术及全速度域应用研究

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铁道学报 2019年第3期41卷 40-49页

作者：徐飞罗世辉邓自刚西南交通大学轨道交通国家实验室(筹) 四川成都610031

首先从磁悬浮列车的角度提出全速度域的概念并将其划分为5个等级,简要分析了社会发展与地面交通速度的关系,认为今后采用磁悬浮轨道交通方式填补高速铁路与航空客运间的速度空白是发展的趋势。随后,通过与传统轮轨列车对比的方式,进一... 详细信息

首先从磁悬浮列车的角度提出全速度域的概念并将其划分为5个等级,简要分析了社会发展与地面交通速度的关系,认为今后采用磁悬浮轨道交通方式填补高速铁路与航空客运间的速度空白是发展的趋势。随后,通过与传统轮轨列车对比的方式,进一步从黏着与非黏着运行,车载与非车载动力,轮轨集中载荷和悬浮分布载荷等方面,分别研究了采用3种不同原理的高速磁悬浮轨道交通的基本特点、关键技术。研究认为,电磁悬浮方式与高温超导悬浮方式的轨道交通具有在全速度域均可运用的潜力,前者的技术关键是有效抑制车轨耦合振动,后者的技术关键是进一步提升承载能力,目前将电动悬浮用于高速域没有重大的技术障碍,但由于磁阻力很大,不适用于中速及以下速度域。

关键词：轨道交通磁悬浮列车全速度域关键技术

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列车碰撞试验台气囊弹射加速仿真研究

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西南交通大学学报 2017年第1期52卷 127-132页

作者：柳忠彬肖守讷罗世辉西南交通大学牵引动力国家重点实验室四川成都610031 四川理工学院机械工程学院四川自贡643000

为了提高机车车辆碰撞试验台的驱动能量,提出气囊自增长可变边界,实现了高压气体在约束且不爆破条件下长距离弹射做功.基于控制体积法,利用LS-Pre Post和LS-DYNA软件建立环形折叠气囊的弹射模型,在初始压缩和一定压力条件下,研究多节气... 详细信息

为了提高机车车辆碰撞试验台的驱动能量,提出气囊自增长可变边界,实现了高压气体在约束且不爆破条件下长距离弹射做功.基于控制体积法,利用LS-Pre Post和LS-DYNA软件建立环形折叠气囊的弹射模型,在初始压缩和一定压力条件下,研究多节气囊的受压弹射过程和气囊构造特征对气囊弹射行为及能量的影响规律.研究结果表明:环形折叠气囊弹射模型能够反映气囊弹射加速方法的基本特性,气囊弹射加速持续并且稳定;气囊节数与弹射距离、能量输出大小和弹射试验台稳定性有关,气囊节数越多弹射作用距离越大、能量输出效果越显著,3节气囊弹射能量是1节气囊弹射能量的6倍;气囊节数越多气囊端部摆动量越大,但3节气囊弹射端部摆动量不超过7 mm,气囊弹射稳定性良好.

关键词：高速列车耐撞性弹射方法数值模拟

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黏滑振动理论及其在铁路机车中的应用

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机械工程学报 2010年第24期46卷 75-82页

作者：姚远张红军罗赟罗世辉西南交通大学牵引动力国家重点实验室成都610031

为研究机车处于黏着极限态时轮对的动态行为,提出平均滑动率和动态滑动率的概念并对黏滑振动稳定性及其振动特点进行分析。黏滑振动是介于黏着和滑动的动态过程,其稳定性取决于轮轨黏着,减小平均滑动率和动态滑动率有利于黏滑振动稳定... 详细信息

为研究机车处于黏着极限态时轮对的动态行为,提出平均滑动率和动态滑动率的概念并对黏滑振动稳定性及其振动特点进行分析。黏滑振动是介于黏着和滑动的动态过程,其稳定性取决于轮轨黏着,减小平均滑动率和动态滑动率有利于黏滑振动稳定。当轮对在黏着及滑动状态的往复交替时,轮对旋转与轮对纵向振动通过轮轨纵向切向力耦合,轮对的纵向振动频率为轮对旋转固有振动频率的整数倍。建立机车机电、控制一体化系统动力学模型,再现轨面黏着条件降低时轮对黏滑振动现象,对理论分析结果进行验证。研究结果表明:增大机车一系纵向刚度,电动机吊挂刚度有利于黏滑振动稳定性,提高机车黏着性能,需要合理匹配轮对纵向定位刚度和电动机吊挂刚度,避免机车黏滑振动时引起结构共振。

关键词：黏滑振动驱动动力学机车黏着参数匹配

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接线相位差对直线电机牵引性能的影响

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中国科学：技术科学 2019年第8期49卷 971-980页

作者：张敏罗世辉马卫华西南交通大学牵引动力国家重点实验室

相邻短初级直线感应电机串联运行时,初级电流相位差对电机牵引性能的影响较大,值得深入研究.本文基于单台电机纵向边端效应分析理论,建立相邻串联电机的纵向边端效应计算模型,对电流相位差与电机复量功率和推力之间的数学关系进行推导;... 详细信息

相邻短初级直线感应电机串联运行时,初级电流相位差对电机牵引性能的影响较大,值得深入研究.本文基于单台电机纵向边端效应分析理论,建立相邻串联电机的纵向边端效应计算模型,对电流相位差与电机复量功率和推力之间的数学关系进行推导;然后利用数学模型对电机电磁特性随接线相位差的变化情况进行详细的分析;最后提出不同间距下电机最佳接线相位差的计算方式.结果表明:电流接线相位差的不同将改变相邻串联电机的纵向边端效应影响系数,随着速度的增大影响越来越明显,且对第二台电机的影响大于第一台电机(按行进的方向),不同的接线相位差使电机牵引力最大有约1kN的差值.利用本文提出的计算方法可为相邻电机选择合理的接线方式,研究结果可为实际工程提供技术指导,通过简便的操作使车辆的牵引性能得到有效的提高.

关键词：直线电机初级电流相位差边端效应系数牵引性能

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