Dynamics of railway wagons subjected to braking/traction torque

Braking or traction torque is regarded as an important source of wheelset skid and a potential source of derailment risk that adversely affects the safety levels of train operations; therefore, this research examines the effect of braking/traction torque to the longitudinal and lateral dynamics of wagons. This paper reports how train operations safety could be adversely affected due to various braking strategies. Sensitivity of wagon dynamics to braking severity is illustrated through numerical examples. The influence of wheel/rail interface friction coefficient and the effects of two types of track geometry defects on wheel unloading ratio and wagon pitch are also discussed in the paper.     

牵引变电所串联电容补偿装置动态控制系统

根据牵引变电所在机车密集运行时母线电压过低和空载或小负荷时母线电压过高等现象，提出采用串联电容补偿装置（SCC）进行投切控制的措施，并介绍该系统动态控制的原理和仿真情况，该装置已经通过试验并投入现场运行。运行结果证明，该装置的使用大大提高了铁路牵引供电的安全性。     

重型牵引车空气悬架钢板弹簧支架强度分析与优化

利用有限元分析软件对某重型牵引车空气悬架的钢板弹簧支架进行强度分析。结果表明,在四种典型工况下,钢板弹簧支架的强度均满足要求,并存在一定的材料冗余;在此基础上,对钢板弹簧支架进行拓扑优化,优化后的钢板弹簧支架质量减轻了6.8%,同时仍满足强度要求。     

双模式动力—传动系统的设计研究

具有高速行驶、低恒速作业两种工况模式的动力—传动系统,可以满足钢轨打磨列车在高速铁路及干线铁路维护作业中快速到达作业现场和低恒速打磨作业的需要,介绍了主要工作原理、性能及相关设计和试验研究的内容。     

Influence of the transmission configuration of a multiple axle vehicle on the obstacle surmounting capacity

Conventional wheeled vehicles have serious mobility limitations in rough terrain while walking vehicles have inherent drawbacks such as a high number of DOF and actuators, control complexity and low-energy efficiency. Vehicles that passively adapt the position of multiple wheels to maintain contact with the ground can be a good compromise between both conventional wheeled and walking vehicles. One way to increase the number of wheels in contact with the ground is using bogies. However, the kinematics of a multiple axle vehicle moving on irregular terrain is quite complex since every wheel can require different angular speed to avoid slippage. The present work aims to quantify the obstacle surmounting capacity of a four axle, double-bogie vehicle depending on the transmission configuration, since it can provoke the slippage of some of its wheels.

Some results are presented corresponding to the vehicle moving on a straight upward slope of different angles and facing variable obstacles in any of its axles.

It can be observed that as more restricted the transmission is, more wheels are forced to slip and less traction the vehicle has, and, as a consequence, less obstacle surmounting capacity.     

朔黄线牵引变电所供电补偿方案的研究

我国电气化铁道既有线的很多地方都存在电能质量不高的问题,因此改善电气化铁道的电能质量是当前亟待解决的问题之一.目前,我国牵引变电所无功功率、谐波和负序的综合治理已有多种方案,本文结合国内重载电气化铁道朔黄线的负荷情况,通过分析多种综合补偿方案,并加以比选,得出适合朔黄线的牵引供电综合补偿方案.     

FC+TCR型动态无功补偿方案效果分析

根据某牵引变电所FC+TCR型无功补偿方案的实际效果,分析了影响补偿效果的原因,介绍了无功补偿容量的计算方法,提出了FC+TCR型无功补偿方案的适用条件和提高其补偿效果的措施.     

基于牵引主变压器突发性故障分析的探讨

通过一起牵引主变压器突发性故障前后油中溶解气体数据的分析研究，对应用溶解气体分析法诊断变压器故障提出了看法。     

基于牵引仿真的列车运行图软冲突疏解方法研究

定义存在于高速铁路列车运行图运行线间的使列车无法在适当功率下运行的软冲突问题,该问题使用既有列车运行图规划方法难以有效解决。分析软冲突形成的机理及其影响,论证牵引供电与列车群一体化仿真计算方法能较好解决软冲突问题,即利用牵引供电计算实现列车运行图软冲突的检测,基于该检测结果进行列车仿真运行调整,从而实现对软冲突的剔除。一体化仿真方法不仅能实现高速列车运行图软冲突的疏解,同时也能得出列车运行过程的操纵策略,并解决了交流牵引供电仿真计算中的某些难点问题。选用我国某一高速铁路线路为例,验证基于牵引仿真的列车运行图软冲突疏解方法。     

18t轴重160km／h货车转向架的研制

介绍了18t轴重160km/h货车转向架的研制过程及技术参数、结构特点和有关试验情况。