城市交通轨道施工测量技术应用分析

伴随着科学技术水平的不断提升和生活质量的提高,人们的需求在逐渐的增多。众所周知城市轨道交通和人们的正常生活之间存在着较为密切的关系,建设好城市轨道交通能够让土地资源更好的得到利用。所以,应该密切关注城市轨道交通的建设过程,为人们的出行带来方便。面对复杂的结构、复杂的施工要设定好管理方法和施工技术方案,严格落实施工测量技术应用要点,保障交通事业的稳定性。进而让社会得以发展,让人们的生活逐渐的趋于方便,彰显出社会的综合实力。基于此,本文主要分析了城市交通轨道施工测量技术应用。

U型梁在城市交通轨道中的应用及相关问题探讨

U型梁是一种新型的且跨度较大的预应力混凝土结构,它不但减振降噪的效果良好,外形很美观,而且断面可利用的空间率也很高,所以在城市交通轨道中的应用是十分广泛的。笔者主要是通过和具体的工程实际结合进行分析,探讨了U型梁在城市交通轨道中的应用及相关问题,希望能为工程的施工提供一些具有信服力的参考。

城市交通轨道应急管理问题探讨

交通事件管理系统是保障道路交通安全、快速、高效、舒适、方便的重要手段。在我国许多道路已经始安装现代化交通流检 测、监视设备,这将为交通事件管理系统 的建立打下良好的基础。同时应注重运用 ITS 理念,把交通事件管理系统与其它系统进 行集 成,通过通信链路的连接实现信息共享和互相配合,以达到整个交通运输系统的高效、安全地运行。

IC卡在轨道交通及城市交通一卡通中系统方案的探讨

结合沈阳市轨道交通项目 ,通过采用不同类型的IC卡对轨道交通及城市交通实施一卡通系统方案进行分析和探讨 ,提出适合沈阳市轨道交通及城市交通的一卡通系统方案及建议。

城市轨道交通系统的噪声污染及防护措施

城市轨道交通系统在给人们出行带来便捷的同时,也不可避免对周围环境造成一定的影响.分析城市轨道交通系统形成的噪声原因、列车噪声的辐射特性,并从降低噪声源的激振强度、切断噪声的传播途径或在传播途径上削弱噪声等方面提出了防护措施.

试谈5G通信在城市轨道交通的应用

4G通讯技术的快速发展与应用推动了我国城市交通轨道的发展,构建了LTE车地无线通讯传输系统,提升了通讯的覆盖范围、传输速度,为我国城市轨道交通带来了便利。随着5G网络的不断研发和大规模商用化,4G技术将逐渐被替代,5G网络将根据以往的发展规律在各个性能方面做出突破,作为城市轨道交通通讯的重要组成部分。文章将简单分析城市轨道交通无线通讯现状,深入研究5G网络通讯在城市轨道交通的应用,旨在给城市轨道交通日后的发展提出建议。

浅论PPP融资模式下城市轨道交通工程的建设

随着现代社会的迅速发展,城市人口越来越密集。城市轨道的快速铺设不仅能够有效的缓解城市交通的压力,且符合低碳减排的绿色出行的中国国情理念。当下,在国内外均有公共事业承接给民营企业的情况,PPP融资模式在城市交通轨道建设的使用,不仅能够减少城市交通轨道建设的财务支出,使城市建设资金利用最大化。本着城市交通轨道的发展现状,制定标准的管理流程,以此来推动城市交通轨道的发展,达到建设美好城市的目的。本文基于PPP融资模式下对城市交通轨道工程的建设影响进行分析.

大城市快速轨道交通方式探讨

通过对快速轨道交通的特点论述，提出有条件的大城市应大力发展高效、快速、环保的轨道交通，指出应优先发展公共交通，作为解决城市交通问题的有效途径。

城市轨道交通大客流时段服务质量提升研究——以宁波轨道交通清明假期组织为例

为有效应对城市轨道交通大客流挑战、提升服务质量,首先,概述城市轨道交通大客流特点和服务质量评价标准;其次,分析大客流对服务质量的影响因素;再次,以宁波轨道交通在清明节期间的运输组织为案例,介绍具体的运输情况;最后,提出针对性的客流组织优化措施,以期为其他城市轨道交通运营提供参考。

Design and verification of an improved experimental platform for stray current in urban rail transit

With the rapid development of urban rail transit,there have been an urgent problem of excessive stray current.Because the stray current distribution is random and difficult to verify in the field,we designed an improved stray current experimental platform by replacing the simulated aqueous solution with a real soil environment and by calculating the transition resistance by measuring the soil resistivity,which makes up for the defects in the previous references.Firstly,the mathematical models of rail-drainage net and rail-drainage netground were established,and the analytical expressions of current and voltage of rail,drainage net and other structures were derived.In addition,the simulation model was built,and the mathematical analysis results were compared with the simulation results.Secondly,the accuracy of the improved stray current experimental platform was verified by comparing the measured and simulation results.Finally,based on the experimental results,the influence factors of stray current were analyzed.The relevant conclusions provide experimental data and theoretical reference for the study of stray current in urban rail transit.

CDIO工程教育模式在城市轨道交通通信专业中的应用

目前,城市轨道交通正在飞速发展,随着城轨交通建设运营规模的逐渐增大,轨道交通的运营城市不断增加,技术设备不断完善,轨道交通专业的技术人员尤为紧缺。城市交通通信专业是服务于城市轨道交通行业发展而开设的专业,主要培养高素质人才,不仅要掌握城市轨道交通通信系统与设备的安装、调试技能,还需具备对故障的分析诊断和处理能力。该文将CDIO应用于城市轨道交通通信专业建设,以期培养具有"务实、细致、规范"职业素养,具备"创新、开拓、自主"全面能力的技术型人才,解决城市轨道专业人才紧缺的问题。

Passenger flow dynamic assignment model of urban mass transit and its application during interval interrupted operation

In order to find a method which can describe the passenger flow dynamical distribution of urban mass transit during interval interrupted operation,an urban railway network topology model was built based on the travel path dual graph by considering interchange,crowd and congestion.The breadth first valid travel path search algorithm is proposed,and the multipath passenger flow distribution logit model is improved.According to the characteristics of passengers under the interruption condition,the distribution rules of different types of passenger flow are proposed.The method of calculating the aggregation number of station is proposed for the case of insufficient transport capacity.Finally,the passenger flow of Beijing urban mass transit is simulated for the case study.The results show that the relative error of most of transfer passenger flow is below 10%.The proposed model and algorithm can accurately assign the daily passenger flow,which provides a theoretical basis for urban mass transit emergency management and decision.

“互联网+”在地铁产业链金融中的应用研究—以青岛地铁为例

在时代驱动以及国家政策支持下,“互联网+”成为如今各行业高速发展的“动力机”,它为产业链金融注入了新的活力。本文从研究产业链金融“蝶变”过程入手,以青岛地铁产业链金融平台为例,研究互联网在地铁产业链金融中的应用,以期对提高我国城市交通轨道效益与效率、促进产融结合及加速新旧动能转换有一定的启示。

中压交流并网供电技术在地铁列车上的应用

目前,城市交通的拥堵不堪、城市用地的日趋紧张以及各式交通工具对城市环境的污染程度的上升,使得城市地铁的发展成为了解决以上问题的关键,地铁供电系统对我国轨道交通的发展发挥着重要作用。文章对中压交流并网供电技术的构成、优点、控制参数等主要内容,中压交流并网供电技术在地铁列车上的应用以及其应用的意义进行了介绍。

Influence of soil resistivity on stray current in power supply system of urban rail transit

In order to explore the influence of soil resistivity on stray current in power supply system of urban rail transit,we establish an equivalent circuit model of the rail-to-ground structure based on resistance network method first.After measuring the soil resistivity of a real subway system,a simulation model is established in Matlab to obtain the stray currents at different soil resistivities.Then the influence of soil resistivity on stray current is analyzed.Afterwards,to verify the rationality and reliability of the simulation model,we design a test circuit to measure the stray current and rail-to-ground voltage in a real subway system,and a comparison of the experimentally measured results and simulation results is presented.The results show that the stray current is the maximum when the soil resistivity is 211.57Ω·m;when the soil resistivity is 768.47Ω·m,the stray current is the minimum,that is,the smaller the soil resistivity,the greater the stray current.Therefore,the resistivity should be increased as much as possible when ramming the track foundation in urban rail transit system.

Combination forecast for urban rail transit passenger flow based on fuzzy information granulation and CPSO-LS-SVM

In order to obtain the trend of urban rail transit traffic flow and grasp the fluctuation range of passenger flow better,this paper proposes a combined forecasting model of passenger flow fluctuation range based on fuzzy information granulation and least squares support vector machine(LS-SVM)optimized by chaos particle swarm optimization(CPSO).Due to the nonlinearity and fluctuation of the passenger flow,firstly,fuzzy information granulation is used to extract the valid data from the window according to the requirement.Secondly,CPSO that has strong global search ability is applied to optimize the parameters of the LS-SVM forecasting model.Finally,the combined model is used to forecast the fluctuation range of early peak passenger flow at Tiyu Xilu Station of Guangzhou Metro Line 3 in 2014,and the results are compared and analyzed with other models.Simulation results demonstrate that the combined forecasting model can effectively track the fluctuation of passenger flow,which provides an effective method for predicting the fluctuation range of short-term passenger flow in the future.

Energy management and coordination control of microgrid in elevated station of urban rail transit

The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking energy feedback unit and battery energy storage unit is proposed,which provides green power for the station.In order to suppress the fluctuation of photovoltaic power generation and the intermittence of regenerative braking feedback energy,the energy management mode of microgrid is designed according to the illumination situation,braking energy feedback situation,battery state of charge and so on.In addition,a coordination control method based on virtual synchronous generator(VSG)is proposed to realize smooth switching among modes.Finally,the proposed energy management and coordination control method for elevated station microgrid is verified by Matlab/Simulink.The results show that the elevated station microgrid can operate safely and reliably under various energy management modes and realize smooth switching among modes.

Estimating walking access area for rail transit station based on discrete choice model

The discrete choice model is used to estimate the walking access area of rail transit stations while considering the influence of existing competition from other traffic modes. The acceptable walking access area is determined according to the willingness of passengers to walk who prefer rail transit compared with bus and automobile. Empirical studies were conducted using the survey data of six stations from the rail transit in Nanjing, China. The results indicate that the rail transit is more preferable compared with bus and private automobile in this case when excluding the influence of individual and environmental factors. It is found that passengers tend to underestimate their willingness to walk. The acceptable walking access area of every rail transit station is different from each other. Suburban stations generally have a larger walking access area than downtown stations. In addition, a better walking environment and a scarcer surrounding traffic environment can also lead to a larger walking area. The model was confirmed to be effective and reasonable according to the model validation. This study can be of benefit to the passenger transportation demand estimation in the location planning and evaluation of rail transit stations.

The influence of MoS_2 on tribology characteristic parameter of Ni60A/MoS_2 composite lubricating coating

The influence of MoS2 on the tribology characteristic parameter of Ni60A/MoS2 composite lubricating coating was researched on the UMT-2 fretting abrasion tester （USA） The result shows that with increasing content of MoS2, the hardness curve of the composite coating decreases and the trend accelerates. Under the same experimental conditions, the mass loss of plasma spray composite coating without adding MoS2 iS 1.27×10^-2 mg. When the amount of MoS2 reaches 35%, the mass loss is 0.96×10^-2 mg. It can be seen that adding MoS2 phase can improve the wear resistance, the amplitude of which is close to 30%. The friction coefficient of plasma spray composite coating without adding MoS2 is 0.23. Adding MoSz could decrease the friction coefficient of the coating and presents a downtrend. When the mass fraction is 35%, the friction coefficient is the smallest （0.13）, and the range is doubled.

Equilibrium analysis of mixed passengers in urban railway network

A model is proposed to describe the passengers’route choice behaviors in urban railway traffic with stochastic link capacity degradation by considering two types of demand,sensitive and insensitive passenger.The insensitive passengers choose their route without paying much attention to congestion.To the contrary,sensitive passengers who consider route congestion choose travel route based on generalized cost.An equilibrium state is given by variational inequalities in terms of travel generalized cost,which is represented by the combinations of mean and variance of total travel time.The diagonalization algorithm is given to solve this programming.Results show that insensitive passengers have large effects on the path choice than sensitive ones,especially for the larger demand.