船舶副机检修中几个不容忽视的技术问题

在船舶副机的检修工作中有几项技术容易被检修人员忽视,从而引起检修效率下降和设备可靠性的降低。这几项检修工作在船舶副机管理中经常遇到,作者根据在不同船舶上管理不同型号副机的工作经验和教训进行总结。     

全面整合智能型铁路信号电源屏的探讨

全面分析铁路信号电源系统中各各环节上存在的问题,产生问题的原因,并提出了进行全面整合的新观念和新方案.     

带温度检测的铁路通行闸机设计

根据疫情防控的需要,通过分析既有测温模块和既有闸机系统,在普通闸机上设计增加测温模块,能够不接触检测旅客的体表温度,结合闸机的开关门进行出入口管控,为疫情防控提供有力支持。     

长春市轨道交通C型列车停车/停放制动控制逻辑分析及改进措施

长春市轨道交通C型第三期列车整车网络控制系统由2家制造商提供,并分别装载于不同生产批次的列车。不同制造商的网络控制系统执行逻辑略有差异,尤其停车制动、停放制动的控制逻辑差异导致列车运营及日常维护受到严重影响,文章针对这2种控制逻辑的差异进行分析,并提出改进措施。     

上海轨道交通2号线信号数据传输系统典型故障分析及维护对策

分析了上海轨道交通2号线信号数据传输系统的典型故障的发生原因,并提出了针对性的故障处理办法,总结了常规化维护措施。开启MOXA交换机网络风暴抑制动能,并优化网络配置结构,升级终端服务器固件,加强对中央H3C网络管理系统的巡视等措施能有效提高信号数据传输系统的安全性、可靠性及运行稳定性。     

磁浮交通道岔位置检测信号冗余设计分析

磁浮交通道岔常采用整梁移动方式改变轨道方向,检测其位置信号的传感器一般使用双行程开关,这些行程开关接点的串并联方式对道岔系统的可靠性有较大影响。文章对5种磁浮交通道岔位置检测信号行程开关连接方案进行分析,探讨不同方案的可靠性和安全性并分析各方案的优缺点,为同类道岔位置检测信号冗余设计提供参考和借鉴。     

Data-driven linear decision rule approach for distributionally robust optimization of on-line signal control

We propose a two-stage, on-line signal control strategy for dynamic networks using a linear decision rule (LDR) approach and a distributionally robust optimization (DRO) technique. The first (off-line) stage formulates a LDR that maps real-time traffic data to optimal signal control policies. A DRO problem is solved to optimize the on-line performance of the LDR in the presence of uncertainties associated with the observed traffic states and ambiguity in their underlying distribution functions. We employ a data-driven calibration of the uncertainty set, which takes into account historical traffic data. The second (on-line) stage implements a very efficient linear decision rule whose performance is guaranteed by the off-line computation. We test the proposed signal control procedure in a simulation environment that is informed by actual traffic data obtained in Glasgow, and demonstrate its full potential in on-line operation and deployability on realistic networks, as well as its effectiveness in improving traffic.     

Hybrid simulated annealing and genetic algorithm for optimizing arterial signal timings under oversaturated traffic conditions

The implementation of system‐wide signal optimization models requires efficient solution algorithms that can quickly generate optimal or near‐optimal signal timings. This paper presents a hybrid algorithm based on simulated annealing (SA) and a genetic algorithm (GA) for arterial signal timing optimization. A decoding scheme is proposed that exploits our prior expectations about efficient solutions, namely, that the optimal green time distribution should reflect the proportion of the critical lane volumes of each phase. An SA algorithm, a GA algorithm and a hybrid SA‐GA algorithm are developed here using the proposed decoding scheme. These algorithms can be adapted to a wide range of signal optimization models and are especially suitable for those optimizing phase sequences with oversaturated intersections. To comparatively evaluate the performance of the proposed algorithms, we apply them to a signal optimization model for oversaturated arterial intersections based on an enhanced cell transmission model. The numerical results indicate that the SA‐GA algorithm outperforms both SA and GA in terms of solution quality and convergence rate. Copyright © 2014 John Wiley & Sons, Ltd.     

地铁信号设备室内电缆敷设方式分析

地铁信号设备室内电缆敷设有静电地板下敷设和天花内吊顶敷设两种。从运营维护和系统设计角度,对信号设备室内电缆的敷设方式进行分析,列举了室内信号电缆采用静电地板下敷设存在的问题。结合运营维护、电缆检修及故障检测,提出更适合信号设备室内电缆的敷设方式为天花内吊顶敷设。     

КЛУБ-У-E型机车信号装置及其在KZ4A型机车上的应用

文章介绍了КЛУ-БУ-E型机车信号装置的组成和功能,及其在KZ4A型电力机车上的应用和试验内容。