上海轨道交通杂散电流腐蚀防护设计初探

根据杂散电流产生机理,分析了轨道交通中发生杂散电流腐蚀的情况;提出杂散电流腐蚀防护对策;介绍杂散电流防堵、排流、监测、运营维护等系统,从而形成技术可靠、经济合理并便于工程实施的防护方案。     

SCADA系统在埋地管道杂散电流监测中的应用方案

根据长输埋地管道分布地域广、所处的环境相对复杂等特点,提出了杂散电流监测方案,将基于无线通讯方式的SCADA系统应用到长输埋地管道杂散电流监测中,实现远程数据采集和监控,能及时发现杂散电流对埋地管道干扰的异常情况.对监测方案的介绍主要包括系统总体结构,硬件和软件构成等方面.     

地铁杂散电流监测系统的工作原理及调试

经过对广州地铁三号线杂散电流监测系统的施工,对其工作原理及调试进行了分析与说明。     

杂散电流腐蚀防护与测试

首先介绍了杂散电流的基本概念、特点及分类,接着分析了目前国内外测试杂散电流的两种主要检测技术的工作原理,并且总结了杂散电流测试仪在实际工程中的应用,介绍了杂散电流测试仪的构成和功能特点,分析比较了国内外杂散电流测试仪,最后介绍了各种防护措施的工作原理,同时总结比较了各种措施的优缺点.通过对杂散电流的研究分析,可以为找出主要问题,探索解决的方案,并为降低杂散电流的影响提供了有力参考.     

输油管道腐蚀与杂散电流测量

阐述了直流杂散电流干扰对管道腐蚀的基本原理,针对直流杂散电流的特点及工程测试要求,设计了智能杂散电流测试仪并用于地下管道的工程测试中。实际应用表明,该仪表具有良好的性能。     

杂散电流测绘仪在埋地钢质管道杂散电流检测中的应用

研究了杂散电流干扰的检测方法及对其干扰程度的评价方法，通过对杂散电流干扰成因和特点的分析，选择杂散电流测绘仪（SCM）作为检测和评价的手段。杂散电流测绘仪是一种智能化的测量仪器，通过后处理软件对采集的数据进行分析就可以获得管线周围杂散电流波形图及干扰数据，对杂散电流的测量与分析有助于掌握管线附近杂散电流情况及制定腐蚀控制策略。该仪器已经在工程中得到了很好的应用，取得了良好的效果。     

地铁杂散电流监测系统新型硫酸铜电极现场试验及测试结果分析

本文对地铁杂散电流监测系统中使用的硫酸铜电极作了简要介绍，特别对地铁２号线使用的新型长效免维护硫酸铜电极作了介绍，并对新型电极的现场试用情况及技术性能测试结果作了分析，供有关技术人员参考。     

基于SCM系统的动态杂散电流检测方法研究

为研究判定直流杂散电流干扰源的实施方法,通过SCM系统对埋地钢质管道动态杂散电流分析找出杂散电流流入点、流出点.现场检测采用多个SCM杂散电流检测感应板配合使用,共检测管道9个不同位置的杂散电流干扰情况,并对监测数据开展相关性分析.实验结果表明:SCM系统能够对干扰源的准确判断及动态杂散电流流入点、流出点的查找提供参考...     

城镇燃气埋地钢质管道杂散电流测试方法

目前,对轨道交通动态杂散电流干扰原理的研究开展的很多,但是,如何判断干扰电流对在役埋地燃气管道的危害程度,至今国内外还没有非常有效的手段。因此,比较了几种测试方法的适应性,提出了管地电位波动监测与SCM杂散电流检测仪相结合的检测方法,为埋地燃气钢质管道周围环境的杂散电流干扰测试与评价提供了新的依据。     

交流杂散电流干扰对管道直流电位的影响

文中利用杂散电流测试仪器,在城市管道受到杂散电流干扰区域进行了杂散电流的详细测试。选取同一条管线的4个点进行了测试,通过测试结果分析杂散电流的大小和方向,判断交流杂散电流对燃气管道直流电位的影响,确定电流流入与流出位置,确定出管线最容易遭受到腐蚀的位置。利用测试结果的分析结论确定施加排流措施方案,并测试排流后的效果。测试结果表明：排流措施施加得当,排流效果良好,能够使阴极保护系统保持正常运行状态。     

城市轨道交通网络中的整体视频监控模型研究

随着国内城市轨道交通步入网络化建设发展阶段,网络化视频技术也得到了广泛地应用。基于上海的现状提出适应轨道交通网络特征下的系统模型,介绍了视频监控网络模型研究,为网络化视频工程的设计、建设和应用提供借鉴思路。     

Evaluating security of rail transit systems: A metric system approach

Crime and fear of crime is a major problem plaguing U.S. transit systems, particularly those serving large urban areas. This paper presents a normative framework for assessing rail transit security following a system-wide metric approach. The security metric can also be used to assess the marginal improvement in security as a result of improving or adopting alternative policing and monitoring strategies. The model consists of five tasks: surveying rail transit security systems, developing a rail transit security metric, assigning efficiency ratings to rail security functions, developing a composite index for the efficiency of the overall security system, and applying a probability matrix to temper the results. Efficiency ratings can be translated into probability of occurrence figures that can be used in a decision tree context to improve rail transit security.     

上海轨道交通清分系统架构中应用云计算技术的探讨

通过对上海轨道交通清分系统构架的现状分析,明确清分、线路中央计算机、车站计算机等系统之间业务功能的调整方向。根据云计算技术的特点,阐述在城市轨道交通自动售检票系统中如何建立私有云计算系统、不同服务层次服务的对象以及实施的技术路线,并提出城市轨道交通自动售检票系统云计算构架的设想与模型。     

A multiple criteria approach for the evaluation of the rail transit networks in Istanbul

The deficiencies in the Istanbul transportation system have led the local authorities to plan several alternative transportation projects. In this paper three alternative rail transit network proposals are evaluated by using Analytic Hierarchy Process (AHP), a multiple criteria decision support system. The AHP facilitates decision-making by organizing perceptions, experiences, knowledge and judgments, the forces that influence the decision, into a hierarchical framework with a goal, scenarios, criteria and alternatives of choice. Based on this analysis, the decision makers have developed a new alternative as a combination of the most closely competing two alternative rail transit networks. This combination rail transit network is currently under construction.     

轨道交通控制中心给排水和消防系统概述

轨道交通控制中心对其给排水和消防设计的安全性和可靠性有着特殊的要求。以上海市轨道交通8、10、12号线三线共用的控制中心为实例,重点介绍了其消防设计方案,并简要阐述了生活给水系统和排水系统的构成,可供同行参考。     

Light rail transit in Canada

This paper describes current light rail transit planning and operation in Canada's major cities and smaller communities. There are ten urban areas in Canada with 250,000 or more people. Two of these have light rail systems in operation, three have lines under construction and nine others are planning LRT systems.     

Modeling a rail transit alignment considering different objectives

An optimization model for station locations for an on-ground rail transit line is developed using different objective functions of demand and cost as both influence the planning of a rail transit alignment. A microscopic analysis is performed to develop a rail transit alignment in a given corridor considering a many-to-one travel demand pattern. A variable demand case is considered as it replicates a realistic scenario for planning a rail transit line. A Genetic Algorithm (GA) based on a Geographical Information System (GIS) database is developed to optimize the station locations for a rail transit alignment. The first objective is to minimize the total system cost per person, which is a function of user cost, operator cost, and location cost. The second objective is to maximize the ridership or the service coverage of the rail transit alignment. The user cost per person is minimized separately as the third objective because the user cost is one of the most important decision-making factors for planning a transit system from the users’ perspective. A transit planner can make an informed decision between various alternatives based on the results obtained using different objective functions. The model is applied in a case study in the Washington, DC area. The optimal locations and sequence of stations obtained using the three objective functions are presented and a comparative study between the results obtained is shown in the paper. In future works we will develop a combinatorial optimization problem using the aforementioned objectives for the rail transit alignment planning and design problem.     

轨道交通车站防排烟风管防火板的应用及建议

通过对当前上海部分轨道交通车站防排烟风管防火板使用情况的调研和分析,就防火板凝露滴水问题对其材质进行了剖析,对防火板材质提出了新的技术要求和建议,以确保轨道交通车站电气设备运行环境的安全。