为研究设备可用度对列车控制中心(TCC,Train Control Center)的影响和预测TCC的剩余使用寿命(RUL,Remaining Useful Life),降低TCC的故障发生率,确保车辆安全运行,构建TCC动态故障树模型。通过引入Markov理论,将其转化为Markov模型,设计...为研究设备可用度对列车控制中心(TCC,Train Control Center)的影响和预测TCC的剩余使用寿命(RUL,Remaining Useful Life),降低TCC的故障发生率,确保车辆安全运行,构建TCC动态故障树模型。通过引入Markov理论,将其转化为Markov模型,设计了TCC可用度评估与RUL预测方法;考虑了TCC的失效率和共因失效,利用D-S(Dempster-Shafer)证据理论对失效数据作数据融合处理,得到TCC设备初始故障区间概率;在此基础上,采用超椭球模型约束设备初始故障区间概率,得到更加精确的底事件故障区间概率;画出Markov状态转移图,用矩阵推导出TCC可用度和RUL的函数关系式,且对可用度的计算还考虑了维修因素。以兰州—乌鲁木齐客运专线某TCC数据作为分析案例,用该方法计算TCC及其各设备的可用度,并预测TCC的RUL。结果表明:与通用方法相比,评估结果相同,但评估信息更丰富。展开更多
高速铁路列控中心(TCC,train control center system)子系统作为安全系统,其与非安全系统调度集中(CTC,centralized traffic control)系统的接口是影响高速铁路安全高效运营的关键接口。结合TCC系统的特点和CTC系统对通道的要求,对该接...高速铁路列控中心(TCC,train control center system)子系统作为安全系统,其与非安全系统调度集中(CTC,centralized traffic control)系统的接口是影响高速铁路安全高效运营的关键接口。结合TCC系统的特点和CTC系统对通道的要求,对该接口进行软、硬件仿真,给出了报文交换过程,并对接口通信故障处理进行了说明。实验结果表明,对这种安全系统与非安全系统的接口,因其仅进行信息交互,采用串行接口是方便可行的。同时,硬件上采用交叉连接冗余配置,保证可靠连接;软件上采用查询方式通信,可以实现较好的接口通信效果。展开更多
使用SKM Power Tools软件对一个数据中心的单母线柴油发电机备用电源系统进行短路计算和电流保护整定分析,并对比两种常用接地方式的保护整定差异,目的是在系统故障或异常工况时,各保护能自动、迅速、有选择地切除故障,保护电气设备不...使用SKM Power Tools软件对一个数据中心的单母线柴油发电机备用电源系统进行短路计算和电流保护整定分析,并对比两种常用接地方式的保护整定差异,目的是在系统故障或异常工况时,各保护能自动、迅速、有选择地切除故障,保护电气设备不受损坏并避免事故扩大。展开更多
AC currents are automatically calibrated by two different thermal current converter(TCC)designs.The two designs are different in the used number of the thermal-elements(TEs).Consequently they differ in their output el...AC currents are automatically calibrated by two different thermal current converter(TCC)designs.The two designs are different in the used number of the thermal-elements(TEs).Consequently they differ in their output electro motive force(EMF).Studying the effect of changing the output EMF is done in this paper through calibrating AC currents.5 mA and 5 A are accurately calibrated at different frequencies 55 Hz,1 kHz and10 kHz by the two TCCs.A comparison is made between the results to evaluate the effect of the output EMF value on the accuracy and the uncertainty of the low and higher AC current calibration.A LabVIEW program is designed for this accurate automatic calibration to overcome the problems of the manual calibration on the thermal converters.展开更多
A smoothing algorithm for energy spectrum based on differential nonlinearity(DNL) error elimination with total counts conservation for high-energy particle detector systems is presented. It is physics based and is onl...A smoothing algorithm for energy spectrum based on differential nonlinearity(DNL) error elimination with total counts conservation for high-energy particle detector systems is presented. It is physics based and is only determined by the DNL error of analog-to-digital converter device itself. From the experimental results, this algorithm slightly improves both noise performance and energy resolution, while greatly reduces the testing errors by almost a half compared to their original values. In addition, the reduced-x^2 statistic for evaluating the Gaussian fitting goodness is significantly reduced by almost two orders after smoothing. As a typical verification example,this algorithm is successfully applied in the ground calibration of the Low Energy X-ray Instrument onboard the Hard X-ray Modulation Telescope(HXMT-LE) satellite,lending it a powerful, nondestructive and low-cost tool for both calibration and data processing for high-energy particle detector systems.展开更多
调度集中(C T C)和列控中心(T C C)是列车控制系统的重要组成部分。本文主要借助Visual C++6.0开发平台,结合现场调度集中与列控中心的工作特色,以临时限速调度命令的设定为目标,参照现场临时限速设定流程,仿真调度集中临时限速命令的...调度集中(C T C)和列控中心(T C C)是列车控制系统的重要组成部分。本文主要借助Visual C++6.0开发平台,结合现场调度集中与列控中心的工作特色,以临时限速调度命令的设定为目标,参照现场临时限速设定流程,仿真调度集中临时限速命令的设定、列控中心对于临时限速命令的可执行性检查以及两者之间的信息交互过程。展开更多
文摘为研究设备可用度对列车控制中心(TCC,Train Control Center)的影响和预测TCC的剩余使用寿命(RUL,Remaining Useful Life),降低TCC的故障发生率,确保车辆安全运行,构建TCC动态故障树模型。通过引入Markov理论,将其转化为Markov模型,设计了TCC可用度评估与RUL预测方法;考虑了TCC的失效率和共因失效,利用D-S(Dempster-Shafer)证据理论对失效数据作数据融合处理,得到TCC设备初始故障区间概率;在此基础上,采用超椭球模型约束设备初始故障区间概率,得到更加精确的底事件故障区间概率;画出Markov状态转移图,用矩阵推导出TCC可用度和RUL的函数关系式,且对可用度的计算还考虑了维修因素。以兰州—乌鲁木齐客运专线某TCC数据作为分析案例,用该方法计算TCC及其各设备的可用度,并预测TCC的RUL。结果表明:与通用方法相比,评估结果相同,但评估信息更丰富。
文摘高速铁路列控中心(TCC,train control center system)子系统作为安全系统,其与非安全系统调度集中(CTC,centralized traffic control)系统的接口是影响高速铁路安全高效运营的关键接口。结合TCC系统的特点和CTC系统对通道的要求,对该接口进行软、硬件仿真,给出了报文交换过程,并对接口通信故障处理进行了说明。实验结果表明,对这种安全系统与非安全系统的接口,因其仅进行信息交互,采用串行接口是方便可行的。同时,硬件上采用交叉连接冗余配置,保证可靠连接;软件上采用查询方式通信,可以实现较好的接口通信效果。
文摘AC currents are automatically calibrated by two different thermal current converter(TCC)designs.The two designs are different in the used number of the thermal-elements(TEs).Consequently they differ in their output electro motive force(EMF).Studying the effect of changing the output EMF is done in this paper through calibrating AC currents.5 mA and 5 A are accurately calibrated at different frequencies 55 Hz,1 kHz and10 kHz by the two TCCs.A comparison is made between the results to evaluate the effect of the output EMF value on the accuracy and the uncertainty of the low and higher AC current calibration.A LabVIEW program is designed for this accurate automatic calibration to overcome the problems of the manual calibration on the thermal converters.
基金supported by the HXMT Projectthe National Natural Science Foundation of China(No.11603027)
文摘A smoothing algorithm for energy spectrum based on differential nonlinearity(DNL) error elimination with total counts conservation for high-energy particle detector systems is presented. It is physics based and is only determined by the DNL error of analog-to-digital converter device itself. From the experimental results, this algorithm slightly improves both noise performance and energy resolution, while greatly reduces the testing errors by almost a half compared to their original values. In addition, the reduced-x^2 statistic for evaluating the Gaussian fitting goodness is significantly reduced by almost two orders after smoothing. As a typical verification example,this algorithm is successfully applied in the ground calibration of the Low Energy X-ray Instrument onboard the Hard X-ray Modulation Telescope(HXMT-LE) satellite,lending it a powerful, nondestructive and low-cost tool for both calibration and data processing for high-energy particle detector systems.
文摘调度集中(C T C)和列控中心(T C C)是列车控制系统的重要组成部分。本文主要借助Visual C++6.0开发平台,结合现场调度集中与列控中心的工作特色,以临时限速调度命令的设定为目标,参照现场临时限速设定流程,仿真调度集中临时限速命令的设定、列控中心对于临时限速命令的可执行性检查以及两者之间的信息交互过程。
