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《电子技术与软件工程》2016,(17)
根据现阶段我国高速铁路的建设情况来看,国内大多数的高速铁路使用的是ZPW-2000A系列的移频设备,这样的情况下促使了车载信号的相关设备对于地面轨道电路的电码化信息中包含的各项信息提出了愈来愈高的要求,而轨道电力的各种干扰以致两轨条对于地电位出现了不平衡的问题,对于列车的整体运行速度及安全带来了一定的负面影响。本文主要对ZPW-2000A轨道电路的具体工作原理进行分析,并针对ZPW-2000A轨道电路干扰以致两轨条对地电位不平衡的原因深入研究。 相似文献
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牵引回流及钢轨电位分布,是关系牵引供电系统安全的重要数据,在高速铁路中,随着牵引负荷的增加.无砟轨道的采用,钢轨电位及电流变化很大。我国高速铁路多采用AT供电方式,有必要对AT供电方式牵引回流和钢轨电位做全面分析。该文针对电气化铁路AT供电方式,通过对牵引回路建立数学模型和计算仿真,得到了牵引回流和钢轨电位的计算公式及其分布规律,并根据分布规律提出了降低钢轨电位的措施。 相似文献
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牵引电机滚动轴承在运行过程中由于存在载荷不均匀和运行环境恶劣的问题,需要评估地铁车辆牵引电机滚动轴承的可靠性.文中基于MATLAB App Designer对牵引电机滚动轴承可靠性评估系统进行了设计开发.通过提取振动信号的时域、频域特征指标,利用主成分分析法进行特征融合.将融合后的特征指标作为威布尔比例故障率模型的响应... 相似文献
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如果轨道电路分路出现问题,会严重影响到铁路的正常行驶,甚至会造成严重的行车事故.为了避免这个问题出现,现如今我们一般用的是不对称高压脉冲轨道电路解决分路不良问题.在实际应用中,不对称高压脉冲轨道电路在与25Hz轨道电路相邻时,在特定情况下,会出现漏解锁现象.本文通过分析不对称高压脉冲轨道电路的电器特性,提出处理方法,解决高压脉冲轨道电路与25Hz相敏轨道电路相邻普遍存在的漏解锁问题和故障. 相似文献
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目前,25HZ相敏轨道电路在铁路信号设备中应用广泛。该轨道电路是以两条钢轨为导体,保证电流在一定范围内流通,用以检查列车占用、传递列车占用信息及实现地面与机车间传递信号控制信息的电器回路。在铁路电气化区段,由条钢轨既要传输信号弱电流,又要传输牵引电流的强电流。在日常维修和故障处理中,必须熟悉电路原理和掌握科学规范的方法,确保维修和故障处理过程的人身安全。 相似文献
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不对称脉冲轨道电路设备产生的不对称脉冲信号,在传输中由于轨道分路不良和干扰等出现失真,这就需要研究一种更为准确、可靠和抗干扰性能好的检测方法来完成对信号的实时分析与检测。基于小波分析的不对称脉冲信号波形检测,利用小波变换模极大值特性,可以有效地解决这个问题。结果表明,该方法有较强的适用性,算法简单,运算速度快。 相似文献
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The application of SPICE to a rail traction network for the simulation of electromagnetic noise emissions and cab signal interference in a DC-fed rail rapid transit system is described. The predictions are validated by a laboratory experiment in which real-time signals are generated by computer using a programmable read-only memory (PROM) lookup table. The simulator can be used to study interference in rail rapid transit systems at low and audio frequencies produced by the combined effects of conduction, magnetic induction, and electric induction. Its use permits the influence of such variables as train position, power demand, and traction duty cycle on interference in cab signaling, track circuit, and other critical noise receivers to be determined. The effect of varying simulation parameters-for example, track impedance-can also be evaluated and parameters strongly influencing the degree of interference identified. The method can also be used to evaluate interference characteristics of new propulsion drives 相似文献
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当前CMOS数字芯片设计流程缺少对电路电磁抗扰性的检验。大幅电磁干扰会导致数字电路出现电路失效,但电路失效的原因以及电路失效与幅度和频率等干扰参数的关系尚不清楚。针对这一问题,详细研究了源端射频干扰下CMOS数字电路的工作状态。通过给出失效与干扰参数的关系的基本理论,得到CMOS数字电路在受扰情况下的失效原因。结果表明,时序错误是大幅电磁干扰引起CMOS电路失效的主要原因。电路失效可通过电路路径延时的漂移和抖动来解释,漂移和抖动与电磁干扰的幅度和频率存在特定关系,因此时序失效是可预测的。基本理论所描述的失效规律可作为EDA工具的原理,用于芯片设计早期阶段对电路的抗扰性检验。 相似文献
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双机牵引转辙机已成为现在地铁正线转换道岔设备的主流设计,较以往的单机牵引转辙机,室内的继电电路更加复杂,转辙机也改为两种型号配合使用,出现了一些单机不曾有的故障。文章重点从室内的继电电路和室外转辙机的接点等方面,分析总结故障出现的原因,并制出相应的预防措施来规避该类故障的发生,降低转辙机设备的故障率,从而提高地铁的运行效率。 相似文献
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牵引式欺骗能够在不引起跟踪环路失锁的条件下诱使接收机跟踪欺骗信号,是一种隐蔽性很高的欺骗干扰方式。对于标量接收机,由于其跟踪环路相互独立,因此针对单个信号进行牵引式欺骗时,不会受其他信号的影响。而矢量接收机的跟踪环路通过接收机状态耦合,存在相互影响,即牵引式欺骗对矢量和标量跟踪环路的影响存在差异。本文基于无噪声且欺骗信号与真实信号载波频率和载波相位相等的假设条件,分析牵引式欺骗对矢量跟踪环路的影响,推导出欺骗成功条件,并利用信号源模拟器和软件接收机对分析结果进行验证。研究结果表明,对矢量跟踪环路成功实施牵引式欺骗的条件较标量跟踪环路更为严苛,反映出矢量跟踪环路固有的抗欺骗干扰能力。 相似文献
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In a multiple-track railroad, the conductors form mutually-coupled ground return circuits. Accurate electrical circuit analysis, required for signaling, traction, and electromagnetic compatibility analysis, is difficult to achieve because of the variability in the equivalent electrical components from their material properties and environmental conditions. The paper describes an application of the finite element method to the electromagnetic analysis of rail track. After validation by benchmark tests using single rail, single- and three-rail track, the technique is used to predict crosstalk between adjacent tracks of a two-track electric railroad 相似文献
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Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory 总被引:1,自引:0,他引:1
Barbosa Rolim L. G. B. Rodrigues da CostaJr. D. R. Aredes M. 《Industrial Electronics, IEEE Transactions on》2006,53(6):1919-1926
This paper presents the analysis and software implementation of a robust synchronizing circuit, i.e., phase-locked loop (PLL) circuit, designed for use in the controller of active power line conditioners. The basic problem consists of designing a PLL circuit that can track accurately and continuously the positive-sequence component at the fundamental frequency and its phase angle even when the system voltage of the bus, to which the active power line conditioner is connected, is distorted and/or unbalanced. The fundamentals of the PLL circuit are discussed. It is shown that the PLL can fail in tracking the system voltage during startup under some adverse conditions. Moreover, it is shown that oscillations caused by the presence of subharmonics can be very critical and can pull the stable point of operation synchronized to that subharmonic frequency. Oscillations at the reference input are also discussed, and the solution of this problem is presented. Finally, experimental and simulation results are shown and compared 相似文献
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《IEE Review》1999,45(6):260-262
Railways provide a good example of the importance of achieving compatibility between electrical and electronic systems. It is all too apparent that interference from traction power equipment may affect signalling systems with potentially dire consequences. So in the UIC, EMC is one of the requirements to be included in the safety case for the introduction of new rolling stock, locomotives or track maintenance vehicles. The author discusses the key EMC problem of the multi-functional role of the rails and then discusses the way in which the railway EMC standards and compliance issues work in practice. The examples of the class 57 locomotive, the Plasser+Theurer Flashbutt welder, track maintenance vehicles, and electric multiple units, are discussed 相似文献
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在轨道电路维护和管理过程中会产生大量的异构,多态数据,即大数据。如何高效存储和快速访问,是目前一个重要的研究课题。文中分析了轨道电路故障检测产生大数据的特点。回顾了当前在互联网和工业监测中大数据的处理技术,以及这些技术在轨道电路故障排除中大数据处理的优势和弱点。最终,从一个大的数据存储,实时数据处理,多数据源的异构集成和大数据可视化4个方面论述了大数据在轨道电路应用中的机遇和挑战。 相似文献