Train Energy-saving Scheme with Evaluation in Urban Mass Transit Systems

In the urban rail transport, factors influencing the consumption of operation energy of trains include the performance of train traction and breaking, weight of the train, the condition of line, the mode of signal blocking, and the mode of train control. The operation energy for trains can be saved by making alteration to the relevant conditions. This paper focuses on the influence of the line conditions on the energy conservation of the urban rail transit using case design and the system simulation. This paper studies energy conservation using the data obtained from the curve (especially small-radius curve), the ramp (divided into upper and lower ramp), and weight of the train. The paper also analyzes the condition for saving energy, which is obtained from the energy-saving slope, and designs energy-saving programs suitable for different section conditions.     

Intermittent automatic train protection using an infrared system

Automatic train protection (ATP) is a vital part of the signalling system that prevents collisions between trains, especially on densely trafficked lines. Conventionally, ATP uses a transponder to communicate between an onboard train device and a trackside device. In Indonesia, ATP is not yet implemented and all trains are currently operated by drivers. It has now become a necessity to install ATP in Indonesia in order to protect train operations. However, as in many tropical and developing countries there are some environmental problems, especially heavy rain, as well as the theft of trackside equipment that influences performance. Installed trackside devices must therefore meet certain criteria such as low-cost configuration, minimalized devices on the track, ease of maintenance, etc. To address the necessity of ATP and to meet these criteria for trackside devices, we develop ATP using an infrared system. This type of ATP – the intermittent ATP system – consists of onboard devices and infrared sensors as trackside equipment. This approach to ATP offers a cost-effective solution and ensures the safety of train movements.     

机车自动驾驶系统模式切换策略研究

受铁路基础装备技术和国内复杂运用环境限制,机车自动驾驶系统仍需在有人值守的情况下工作,所以应有完善的自动驾驶系统模式切换策略来界定值守人员和自动驾驶的权限边界。以机车运行安全为原则,基于列车纵向动力学分析动态切换时列车的平稳性,阐述了机车自动驾驶系统的模式切换策略,该策略已经运用于机车自动驾驶实际应用中。大量实践案例证明,提出的机车自动驾驶模式切换策略能够有效保证机车控制权模式切换过程中列车的安全、平稳运行,取得了良好的运行效果。     

现场总线在地铁列车清洗机上的应用

Profibus- DP(现场总线)用于现场设备的高速数据传输.中央处理器通过高速串行总线同分散的现场设备进行通信,分散的DP从站通过总线连接到可编程程序控制器上.Profibus- DP提供强有力的组态和诊断功能,是一种低成本、灵活的信号传输解决方案,可替代麻烦的并行线路.列车清洗机是地铁列车表面自动清洗的设备.阐述...     

船用大功率两级人字齿行星传动系统的振动特性研究

单级行星传动的动态特性已有很多学者研究,但特大型机械装置(如舰船)中应用的两级人字齿行星传动的动态特性研究还未见报导。为此文章在两级人字齿行星齿轮系统的弯扭耦合动力学方程的基础上,对此行星齿轮系统进行了自由振动的动态特性分析,揭示出两级人字齿行星传动的三种振动模式:星形轮系振动模式、行星轮系振动模式和耦合振动模式,并对三种振动模式进行了特征值问题和模态问题的研究,得到了系统固有频率和振型之间的相互关系,为进一步的动态特性分析奠定了理论基础。     

摆式列车受电弓垂向振动主动控制

建立了摆式列车机电耦合动力学模型、受电弓线性和非线性动力学模型及接触网有限元模型和静态接触刚度模型,组成摆式列车-受电弓-接触网耦合动力学模型,分别设计了P和H∞鲁棒控制器,应用数值仿真方法,研究了摆式列车直线和曲线通过时两种控制器对摆式列车受电弓垂向主动控制的效果。结果表明受电弓若无垂向控制,其弓网接触压力波动较大;P和H∞鲁棒控制均能减小弓网接触压力的波动;控制延时对P控制比对H∞鲁棒控制的影响大;是否考虑接触网的振动对接触压力影响较大,对控制效果影响不大。这说明摆式列车受电弓垂向主动控制能明显改善弓网接触压力波动;H∞鲁棒控制比P控制效果更好;接触网的静态接触刚度模型可用于受电弓主动控制的定性分析。     

A new approach for improving the performance of freight train timetabling of a single-track railway system

A new approach for improving the performance of freight train timetabling for single-track railways is proposed. Using the idea of a fixed-block signaling system, we develop a matrix representation to express the occupation of inter- and intra-station tracks by trains illustrating the train blocking time diagram in its entirety. Train departure times, dwell times, and unnecessary stopping are adjusted to reduce average train travel time and single train travel time. Conflicts between successive stations and within stations are identified and solved. A fuzzy logic system is further used to adjust the range of train departure times and checks are made to determine whether dwell times and time intervals can be adjusted for passenger and freight trains at congested stations to minimize train waiting times. By combining manual scheduling expertise with the fuzzy inference method, timetable efficiency is significantly improved and becomes more flexible.     

铁路客车轮对踏面硌伤自动分析系统的研究与实现

为了解决客车轮对踏面硌伤人工分析效率低且质量不高的问题,基于大数据关联分析技术,构建了一套硌伤自动分析系统.从硌伤排查、自动分析、故障定位、统计分析4个方面分析系统的主要组成和功能,探讨了实现系统的关键技术.系统的应用提高了对客车轮对踏面硌伤分析和故障排查的效率.     

A practical capacity model of a single track line

The paper presents a model for determining the practical capacity of a single track line, i.e. the maximum number of trains which can be run along it in a time unit under the condition that each train enters its bottleneck segment with a definite delay.

The input data used in the model are: geometrical characteristics of the bottleneck segment of the line under study, the intensity and structure of demand expressed by a number of trains which are run over the line in a given time unit, the scenario of traffic running over the line under study and the operational tactics of individual train categories processing on the bottleneck segment.

(Two tactics can be applied in the train processing on the line under study; first, the trains of individual categories are given different priorities in the processing, and second, all the trains have the same priority).

The output results of the model are average delays of trains of each category occurring within the train processing performed on the bottleneck segment of the line under study in a given time unit.     

基于刚柔耦合多体动力学模型的配气机构计算

通过在配气机构多刚体模型中引入柔性体,描述了配气机构的动力学性能;建立了柔性体气门弹簧,分析了气门弹簧动刚度的非线性行为,并且依据模态技术计算得到其动态应力;该方法为优化设计配气机构等机械产品及对其进行疲劳性能研究提供了依据。