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An Analysis of Users’/Customers’Perceptions of the Nigerian Rail Transport Services
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作者 Joyce O.O.Ubrurhe 《Journal of Traffic and Transportation Engineering》 2023年第1期36-44,共9页
Rail transport has and continues to play a key role in the movement of goods and passengers in many countries around the world including Nigeria.However,while rail transport continues to enjoy relative importance in t... Rail transport has and continues to play a key role in the movement of goods and passengers in many countries around the world including Nigeria.However,while rail transport continues to enjoy relative importance in terms of investment,growth and contribution to the national economy in several countries,it has suffered and declined(in terms of modal share contribution which has led to decreased patronage)in Nigeria.However,there are new developments and investment on rail and some measures are being put in place to revive the Nigerian rail transport system.As these new developments and rehabilitations are going on,it will be imperative to know what the users/customers think as well,so that they are not left out because under normal circumstances,customers need transport services and not rail transport services.Therefore,if they were not satisfied with rail transport services they would simply turn to other modes of transport.As part of an on-going PhD research project,this paper focuses on the perceptions of Nigerian rail transport users/customers regarding the quality of rail services provided.Data was collected by the use of structured/semi-structured questionnaires,which were distributed,to the respondents.The study sample included 474 respondents between the age range of 20-70 out of which just 21(4.4%)have used rail transport;this low patronage figure is as a result of the long time neglect of the Nigerian rail transport system while 474(100%)of the correspondents use road transport daily which has led to an increasing pressure on road transport and infrastructures.Data was collected respectively from the following cities:Lagos,Warri,Ughelli and Benin. 展开更多
关键词 rail transport railWAY transport service
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A New Multi-Objective Model to Optimise Rail Transport Scheduler 被引量:1
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作者 Mahmoud Masoud Geoff Kent +1 位作者 Erhan Kozan Shi Qiang Liu 《Journal of Transportation Technologies》 2016年第2期86-98,共13页
The sugarcane transport system plays a critical role in the overall performance of Australia’s sugarcane industry. An inefficient sugarcane transport system interrupts the raw sugarcane harvesting process, delays the... The sugarcane transport system plays a critical role in the overall performance of Australia’s sugarcane industry. An inefficient sugarcane transport system interrupts the raw sugarcane harvesting process, delays the delivery of sugarcane to the mill, deteriorates the sugar quality, increases the usage of empty bins, and leads to the additional sugarcane production costs. Due to these negative effects, there is an urgent need for an efficient sugarcane transport schedule that should be developed by the rail schedulers. In this study, a multi-objective model using mixed integer programming (MIP) is developed to produce an industry-oriented scheduling optimiser for sugarcane rail transport system. The exact MIP solver (IBM ILOG-CPLEX) is applied to minimise the makespan and the total operating time as multi-objective functions. Moreover, the so-called Siding neighbourhood search (SNS) algorithm is developed and integrated with Sidings Satisfaction Priorities (SSP) and Rail Conflict Elimination (RCE) algorithms to solve the problem in a more efficient way. In implementation, the sugarcane transport system of Kalamia Sugar Mill that is a coastal locality about 1050 km northwest of Brisbane city is investigated as a real case study. Computational experiments indicate that high-quality solutions are obtainable in industry-scale applications. 展开更多
关键词 Train Scheduling rail transportation SUGARCANE Mixed Integer Programming HEURISTICS
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Politics of Rail Transport Development in Developing Countries: Case of Nigeria
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作者 Joshua A. Odeleye 《Journal of Civil Engineering and Architecture》 2012年第12期1695-1702,共8页
Rail transport in most developing countries, is usually the least developed mode. For instance, in Nigeria the vibrant fortune of rail transport operations and development has been on decline since mid 1970s.The devel... Rail transport in most developing countries, is usually the least developed mode. For instance, in Nigeria the vibrant fortune of rail transport operations and development has been on decline since mid 1970s.The developmental gap in rail transport in Nigeria is responsible for a significant level of access denial to a safer, affordable and environmentally-friendly mode of transport, to the younger generation of Nigerians. Through a critique of past railways developmental projects and policies, this paper was able to identify the principal factors responsible for its intangible contributions to the socio-economic development of Nigeria. It further highlighted the role(s) politics of policies inconsistency and somersault plays, to the detriment of realization of a vibrant railway system in Nigeria. The findings revealed that discontinuity and incoherence in policy implementation by successful governments, policy reversal as well as uncoordinated national transport policy goal and objectives as clogs in the wheel of progress of railways development in Nigeria. In conclusion, the paper hinged the rapid development of the rail industry in Nigeria on institutional paradigm shift, whereby the rail authority will enjoy a reasonable level of autonomy in decision making, finance and investment in rail operations, infrastructure supply and technological advancement in Nigeria. 展开更多
关键词 rail transport transport policy institutional framework public-private participation Nigeria.
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Experimental Characterization of Shape of an Aggregate by a Numerical Value—Application to Senegalese Basaltic Aggregates for Rail Transport
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作者 Abdoulaye Diedhiou Libasse Sow Ndeye Mareme Diop 《Open Journal of Civil Engineering》 2020年第2期131-142,共12页
This article first talks about railways in general and ballast in particular. An inventory is then made on the modernization of the Senegalese ballast railways. In the second phase, an experimental work of characteriz... This article first talks about railways in general and ballast in particular. An inventory is then made on the modernization of the Senegalese ballast railways. In the second phase, an experimental work of characterization of basaltic aggregates of Diack (Locality of Ngoundiane, Thiès region, Senegal) is presented. The grain size studied is 25/50 mm as for any material studied for use as railway ballast. Experimental work presented consists of the characterization of the shape of an aggregate using the NF P 18-301 standard. The test consists of comparing the volume of the aggregate to that of an equivalent sphere with the largest diameter of the aggregate, by calculating the average volume coefficient. With a Representative Elementary Volume (REV) of 6 aggregates, the volume coefficient “C<sub><span style="font-family:Verdana;">v</span></sub><span style="font-family:Verdana;">” fluctuates between 0.27 and 0.49 with an average volume coefficient of 0.39 which is well above 0.15</span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">. </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">The grains studied are polyhedral and therefore have a high mechanical resistance.</span></span></span> 展开更多
关键词 BALLAST rail transport BASALT SHAPE Volume Coefficient
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Demand Elasticity of Capacity Offered for Urban Rail Transport
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作者 Pradeep Kumar Sarkar Jain Amit Kumar 《Journal of Transportation Technologies》 2016年第4期163-168,共6页
The high peak hour demand in Urban Rail Transport (URT) is usually met by supply side measures such as pushing more number of trains/cars in peak hour by the operator. This additional capacity generates more demand du... The high peak hour demand in Urban Rail Transport (URT) is usually met by supply side measures such as pushing more number of trains/cars in peak hour by the operator. This additional capacity generates more demand due to a positive elasticity of demand with respect to services. Delhi Metro Rail Corporation (DMRC), India has converted its fleet from 4 cars per train to 6 cars per train and finally to 8 cars per train on its Broad Gauge section. The ridership of the system has also witnessed double digit growth during this conversion period. The demand elasticity w.r.t services for the passengers of DMRC has been estimated as 0.512 on the basis of growth of demand and increase in capacity after adjusting for natural growth. So a 10% increase in supply results into 5% increase in capacity. A simple service elasticity model has been developed to estimate demand with increase in supply. The model has been applied to Line 2 (yellow line), the busiest line of DMRC, to estimate the demand for different level of services (trains/hour). The efficacy of supply side measures is limited by the design capacity of the system beyond which any increase in supply would require disproportionate investment. An optimum combination of supply and demand side measures would perhaps be the best way to address peak hour congestion in Urban Rail Transport. 展开更多
关键词 CONGESTION DEMAND ELASTICITY Supply Urban rail transport
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The Development of Rail Transportation and the Application of High Technology
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作者 QianQiangquan HeZhengyou 《工程科学(英文版)》 2004年第1期1-6,共6页
Many developed countries in the world have adopted high technology to rebuild and improve the rail transportation industry actively. It has greatly increased the security and automation degree of rail transportation. ... Many developed countries in the world have adopted high technology to rebuild and improve the rail transportation industry actively. It has greatly increased the security and automation degree of rail transportation. Since “the ninth five year plan", the velocity and quality of rail transportation infrastructure construction have been improved quickly by applying high technology in China. However, there still exist many differences between China and the developed countries in the development of rail transportation. In this paper the author systematically introduced the application of high technology in rail transportation such as railway, metro, light railway, railway nearby su\| burb, maglev railway, etc. and also the development road to high technology industrialization in transportation field, on the basis of viewing the current development condition and the trend of rail transportation in the world and analyzing the development status and trend of rail transportation in China. 展开更多
关键词 中国 铁路运输 高科技 工业化 第九个五年计划 地铁
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Optimization of Urban Rail Transportation in Emerging Countries Using Operational Research Techniques
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作者 M. C. Agarana T. A. Anake H. I. Okagbue 《Applied Mathematics》 2016年第10期1116-1123,共8页
Rail systems are gradually becoming the most desirable form of transit infrastructure around the world, partly because they are becoming more environmentally friendly compared with airplanes and automobiles. This pape... Rail systems are gradually becoming the most desirable form of transit infrastructure around the world, partly because they are becoming more environmentally friendly compared with airplanes and automobiles. This paper examines the place of emerging countries in this move of implementing modern rail system that will eventually enhance the realization of a low-carbon society. Network model, transportation model and linear programming algorithms are used to model the present urban rail transport system in Nigeria, as an emerging country, in order to optimize it. Operational research methods, including simplex method and MODI, with the aids of computer software (excel solver and LIP solver) were adopted to solve the resulting models. The results showed that optimization of rail transport system will not only reduce carbon emission but also bring about economic development which is required for the eradication of prevalent poverty in these emerging countries. 展开更多
关键词 rail System Emerging Countries Operational Research Network Model transportation Model Linear Programming Algorithm
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An overview of bearing voltages and currents in rail transportation traction motors
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作者 Yao LI Lin QIU +4 位作者 Yongjian ZHI Zifan GAO Jien MA Jian ZHANG Youtong FANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2023年第3期226-242,共17页
In modern rail transportation,inverter drive systems have been extensively used due to their excellent speed control capabilities.However,in recent years,premature failure problems caused by bearing voltage and curren... In modern rail transportation,inverter drive systems have been extensively used due to their excellent speed control capabilities.However,in recent years,premature failure problems caused by bearing voltage and current phenomena have been frequently reported in electric motors,with electrical bearing failures making up a considerable percentage.The purpose of this review is to provide a comprehensive overview of facets relating to the electrical erosion of bearings in an electrical environment represented by railway vehicles.First,the origins of the phenomenon as well as typical bearing electrical failure modes are discussed.Next,we introduce the distinctive features of the electrical environment of railway traction motor bearings,including output voltages with high common-mode components and systems with complex grounding configurations.Then,we classify the fundamental mechanisms for generating bearing voltages/currents into four groups,and present their modeling processes,including equivalent circuit establishment and parameter determination methods.Furthermore,we summarize the strategies frequently used to protect bearings,and describe a typical solution to suppress electrical bearing failures in railway vehicles.Finally,we present a case example to illustrate a research procedure for systematic investigation of inverter-induced bearing currents in rail transportation. 展开更多
关键词 rail transportation Bearing current Common-mode voltage Bearing electrical erosion Grounding configuration
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A Perspective on Solar Energy-powered Road and Rail Transportation in China 被引量:10
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作者 Limin Jia Jing Ma +1 位作者 Peng Cheng Yikai Liu 《CSEE Journal of Power and Energy Systems》 SCIE CSCD 2020年第4期760-771,共12页
As essential pillars of passenger mobility and freight transport,road and rail transportation have experienced a rapid increase over the past years.This trend indicates an increase in energy consumption,especially ele... As essential pillars of passenger mobility and freight transport,road and rail transportation have experienced a rapid increase over the past years.This trend indicates an increase in energy consumption,especially electricity,due to higher energy efficiency and less carbon emission,but it exacerbates the contradiction between the power supply and demand.Nowadays,for additional power sources,increased solar power generation has been widely installed in their own available spaces for road and rail transportation,which has attracted a great deal of attention.This paper reviews the current status of solar power generation and its integrated application in the transport sector.Then,the photovoltaic generation potential of road and rail transportation in China are evaluated.Finally,further developments and perspectives of solar energy-powered road and rail transportation are presented,which not only contributes to lower-carbon and green transportation,but also promotes the development of renewable power generation for energy transformation.It is confirmed that solar energy-powered road and rail transportation is a promising approach for sustainable transportation with more renewable energy and less carbon emission. 展开更多
关键词 Potential evaluation photovoltaic generation road and rail transportation solar energy
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Rail Transport in Urban China ──A Hard Process
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作者 Our Reporters 《China City Planning Review》 1995年第2期16-20,共5页
RailTransportinUrbanChina──AHardProcessOurReportersAbstract:Thisreport,basedonourinterviews,givesreadersasum... RailTransportinUrbanChina──AHardProcessOurReportersAbstract:Thisreport,basedonourinterviews,givesreadersasummaryonthecurrenta... 展开更多
关键词 A Hard Process rail transport in Urban China
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ComplexTrans-Global Rail-Road Transportation System Economical and Clustered Individual and Individualised Public Transport also Prevents the Spread of Covid 19
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作者 Jiri Hofman Roman Cermak 《Journal of Civil Engineering and Architecture》 2021年第5期255-276,共22页
Land transport can no longer meet the requirements.European transport can be described by these words−crowded motorways and cities,dangerous emissions,ubiquitous traffic accidents,delays,expensive railways.Solutions a... Land transport can no longer meet the requirements.European transport can be described by these words−crowded motorways and cities,dangerous emissions,ubiquitous traffic accidents,delays,expensive railways.Solutions are being sought to transfer a large part of passengers and especially freight transport to(high-speed)rail,and efforts are moving towards electromobility,car-sharing,5G-connectivity,autonomous driving,MaaS(Mobility as a Service)-coordinated transport or hyperloop-type solutions.However,all these solutions have additional challenges and limitations.Solutions are not being searched where they really exist-in the mutual adaptation of road and rail vehicles and their deep cooperation.The ComplexTrans project shows that simply adapting the dimensions and functions of road and rail vehicles can eliminate(or at least significantly reduce)all the problems of existing land transport.The main features of the ComplexTrans system are sufficient parking spaces,reduction of urban and non-urban congestion,electric vehicles with unlimited range and cheaper than standard cars,cheaper and more accessible battery charging,“autonomous ride”,solving the overlap between passenger and freight rail transport and making it self-financing,transferring intercity freight transport to rail,replacing part of continental air transport and many others.The cost-effective and clustered individual transport and individualised public transport of the ComplexTrans system also bring very significant reductions in the risk of transmission of covid-19 and other contagious diseases during transport. 展开更多
关键词 land transport intermodal transport mixed transport road and rail transport passenger and freight transport city transport intercity transport private transport public transport MAAS covid prevention in public transport e-mobility autonomous ride car parking traffic density reduction platooning range extender battery exchange energy need reduction CO2 emissions reduction V2G transport and energy sector cooperation energy safety
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Analysis of the Relationship Between Railway and Highway Transportation and China's Economic Development
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作者 Shibo Ma 《Proceedings of Business and Economic Studies》 2021年第2期43-46,共4页
China has a vast land area and frequent interconnections between various regions.China's transportation industry is faced with tremendous pressure.This article combines China’s railway and highway transportation ... China has a vast land area and frequent interconnections between various regions.China's transportation industry is faced with tremendous pressure.This article combines China’s railway and highway transportation conditions to predict China’s economic development,uses stepwise regression to screen explanatory variables,and finally determines railway passenger turnover,road freight volume and passenger car ownership as the explanatory variables,and GDP as the dependent variable,and also analyzes China’s economic development by establish ing a multiple regression model. 展开更多
关键词 rail transport Road transport Multiple linear regression model Stepwise regression
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铁路隧道TBM施工物料运输方式对比分析
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作者 齐梦学 曾绍毅 +2 位作者 杨庆辉 刘卓 郭志龙 《隧道建设(中英文)》 CSCD 北大核心 2024年第5期1077-1085,共9页
为便于选择TBM施工物料运输方式,以铁路隧道为工程背景,首先,简要总结有轨运输和无轨运输2种运输方式的特点及其工程应用情况;然后,根据施工实践拟定典型工况,研究典型工况下的运输方案及设备配置,并从设备配置和工期2个方面对有轨运输... 为便于选择TBM施工物料运输方式,以铁路隧道为工程背景,首先,简要总结有轨运输和无轨运输2种运输方式的特点及其工程应用情况;然后,根据施工实践拟定典型工况,研究典型工况下的运输方案及设备配置,并从设备配置和工期2个方面对有轨运输和无轨运输进行详细对比分析。研究结果表明:1)有轨运输和无轨运输在铁路隧道TBM施工中技术上都是可行的,总工期无明显差异。2)我国配合TBM施工的内燃机车质量明显不高且突破难度较大,应努力提升电动机车的工程适应性、可靠性、耐久性以及人性化设计;同时,需要规范有轨运输设备配置要求、轨道铺设和维护质量,以提升有轨运输的效率。3)需要研究适合TBM施工工况且成本低、通用性好的无轨运输设备。 展开更多
关键词 铁路隧道 TBM 物料运输 有轨运输 无轨运输
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多源车载数据驱动的地铁轨道不平顺智能识别方法
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作者 彭飞 谢清林 +2 位作者 陶功权 温泽峰 任愈 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第6期2432-2445,共14页
针对轨道不平顺检测成本高与时效性低等不足,从车辆动态响应与轨道不平顺之间的相关性为切入点,提出一种多源车载数据驱动的轨道不平顺智能识别方法。首先,建立地铁车辆系统动力学模型,获取车辆振动与运动姿态响应数据;其次,通过相关性... 针对轨道不平顺检测成本高与时效性低等不足,从车辆动态响应与轨道不平顺之间的相关性为切入点,提出一种多源车载数据驱动的轨道不平顺智能识别方法。首先,建立地铁车辆系统动力学模型,获取车辆振动与运动姿态响应数据;其次,通过相关性分析算法,选取强相关性数据,制作网络模型数据集;最后,建立卷积神经网络-长短期记忆网络(CNN-LSTM),通过粒子群算法优化(PSO)神经网络模型参数,建立PSO-CNN-LSTM模型,实现对轨道不平顺的识别拟合。研究结果表明:在车辆动态响应信号中,与横向信号与轨道不平顺之间的相关性相比,垂向信号的更强,同时,车体的运动姿态如车体点头角速度与不平顺有明显的相关性。所提出的PSO-CNN-LSTM模型轨道垂向与横向不平顺识别拟合度分别达0.92和0.76。与经典的全连接神经网络FCNN和支持向量机SVR相比,PSO-CNN-LSTM有更好的识别效果与时效性。 展开更多
关键词 轨道交通 车辆动力学 轨道不平顺 神经网络 智能识别
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石球阵列对轨道交通振动表面波隔振性能研究
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作者 姜荣斌 蒋凤昌 周桂香 《科技通报》 2024年第5期13-18,95,共7页
本文针对轨道交通运营时带来的持续性振动对周边居民身体健康和敏感构建物结构安全的影响进行探讨。基于周期理论,提出一种石球阵列隔振结构来减轻轨道交通运营引起的环境振动危害。通过求解频散曲线图,研究石球阵列参数对带隙的影响,... 本文针对轨道交通运营时带来的持续性振动对周边居民身体健康和敏感构建物结构安全的影响进行探讨。基于周期理论,提出一种石球阵列隔振结构来减轻轨道交通运营引起的环境振动危害。通过求解频散曲线图,研究石球阵列参数对带隙的影响,并剖析了隔振机理;其次,通过求解传输透射谱,研究了有限数量石球阵列隔振性质。研究发现,石球排距和尺寸大小对表面波能带影响较大,针对低频表面波隔振,石球排距建议取1.0~1.2 m,石球尺寸建议大于0.4 m;石球的排布方式对高频能带影响较大,对低频能带影响较小;相比正方形排布方式,三角形排布方式可以降低振动波泄漏,隔振效果更好。传输谱透射分析发现,石球阵列低频隔振时隔振机理为局域共振机理,高频隔振时机理为Bragg散射机理;组合石球隔振方式可以拓宽衰减域,隔振效果更好。相关研究可为轨道交通隔振提供参考。 展开更多
关键词 周期结构 石球 表面波 轨道交通 隔振
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轮轨摩擦系数对低地板轻轨动力响应及车轮磨耗的影响
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作者 李雪 王粤欣 王开云 《交通信息与安全》 CSCD 北大核心 2024年第1期41-48,共8页
为了确保低地板轻轨车辆安全且平稳地运行,以某轻轨线路为依托,利用多体动力学软件UM(Universal Mechanism)建立了低地板轻轨车辆-轨道耦合动力学模型。选用LM磨耗型车轮踏面以及R50标准钢轨,以美国六级不平顺轨道谱作为线路激扰。基于H... 为了确保低地板轻轨车辆安全且平稳地运行,以某轻轨线路为依托,利用多体动力学软件UM(Universal Mechanism)建立了低地板轻轨车辆-轨道耦合动力学模型。选用LM磨耗型车轮踏面以及R50标准钢轨,以美国六级不平顺轨道谱作为线路激扰。基于Hertz及Kalker简化理论、Archard模型,进行不同摩擦系数共5个工况下车辆动力响应以及车轮磨耗变化规律的仿真分析。在此基础上进一步分析了4个不同运行里程阶段对应共96组车轮磨耗型面下轻轨车辆安全性指标的变化规律。研究了4个不同运行里程阶段对应的不同车轮磨耗型面下车辆过曲线时安全性指标随摩擦系数的变化情况。结果表明:脱轨系数、轮轴横向力、轮轨横向力、车体横向加速度受摩擦系数的影响较为显著,而轮重减载率、车体垂向加速度对摩擦系数的改变并不敏感。车轮磨耗深度随里程和摩擦系数的增加而增大,且相同工况下独立旋转车轮的磨耗情况更加严重。在车辆运行40000 km后,其轮轨横向力、轮轴横向力、脱轨系数整体呈现随里程增加而增大的规律,而轮重减载率基本不受运行里程的影响。在不同摩擦系数及运行里程的叠加影响下,轮轨横向力、轮轴横向力、脱轨系数的峰值出现的位置不同,而轮重减载率却始终处于较为稳定的状态。 展开更多
关键词 轨道交通 低地板轻轨 动力响应及车轮磨耗分析 车辆-轨道耦合动力学 摩擦系数
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我国铁水联运标准化建设现状研究分析及对策建议
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作者 姜景玲 汪健 田春林 《标准科学》 2024年第3期63-67,共5页
铁水联运标准化是助推铁水联运高质量发展的重要技术支撑。为明晰制约铁水联运高质量发展的标准化问题,准确把握铁水联运标准化工作任务,本文在文献调研、实地调研、专家座谈和问卷调研的基础上,全面梳理了我国铁水联运标准化取得的成绩... 铁水联运标准化是助推铁水联运高质量发展的重要技术支撑。为明晰制约铁水联运高质量发展的标准化问题,准确把握铁水联运标准化工作任务,本文在文献调研、实地调研、专家座谈和问卷调研的基础上,全面梳理了我国铁水联运标准化取得的成绩,深入研究了基础设施标准不健全、服务规则不统一、危险货物界定标准不一致、信息交换标准有待完善、标准实施效果不佳等制约铁水联运高质量发展的标准化问题,并从重点标准制修订、标准实施评估、标准宣贯和推广应用等方面提出了对策建议,为加强铁水联运标准化工作提供决策支持。 展开更多
关键词 铁水联运 标准化 现状 对策
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上海轨道交通既有线运能提升研究
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作者 施董燕 周明 《城市轨道交通研究》 北大核心 2024年第10期135-139,共5页
[目的]通过总结上海城市轨道交通既有线运能提升改造项目的实施经验,为其提出有效的运能提升方法及具体案例。[方法]深入分析上海轨道交通既有线运能不足的主要原因及其影响因素;基于这些分析,提出运能提升的技术路线及5大核心策略;详... [目的]通过总结上海城市轨道交通既有线运能提升改造项目的实施经验,为其提出有效的运能提升方法及具体案例。[方法]深入分析上海轨道交通既有线运能不足的主要原因及其影响因素;基于这些分析,提出运能提升的技术路线及5大核心策略;详细介绍了上海轨道交通9号线实现1 min 50 s最小行车间隔、3号线与4号线增能改造、5号线从4节编组扩编至6节编组、6号线增能改造及增设复线等成功案例。[结果及结论]影响线路运能的主要因素包括车辆基地规模、区间通过能力、出入场能力,以及供电能力等。针对这些因素,确定了运能提升的技术路线,即从客流预测及客流特征分析入手,进行设施设备能力评估,设计行车交路方案,最终形成科学的改造方案。同时,提出了5大策略:运营管理优化、既有系统能力挖潜及改造、信号系统升级或土建局部改造、系统规模性改造及线网整体优化。 展开更多
关键词 城市轨道交通 运能提升 线路通过能力评估 既有线改造
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铁路枢纽双编组站静态配流协同优化研究
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作者 户佐安 朱雨 +1 位作者 怡智航 陈将 《铁道运输与经济》 北大核心 2024年第1期17-25,共9页
枢纽内跨编组站进行协同配流有助于优化枢纽内的车流接续,提高全局配流质量。引入跨编组站协同配流思想,构建铁路枢纽双编组站静态配流协同优化模型,以最小化双编组站的配流总代价、最大化双编组站的总满轴列车数为优化目标,考虑车流量... 枢纽内跨编组站进行协同配流有助于优化枢纽内的车流接续,提高全局配流质量。引入跨编组站协同配流思想,构建铁路枢纽双编组站静态配流协同优化模型,以最小化双编组站的配流总代价、最大化双编组站的总满轴列车数为优化目标,考虑车流量约束、列车到解编发作业与枢纽小运转列车走行的接续时间约束、出发列车满轴与不违编约束、调机资源使用约束。以列车等级、编组去向数及出发时刻排序作为配流代价。设计理想点算法将多目标转化为单目标进行求解,最后运用算例对模型及算法的有效性进行验证。结果表明,双编组站联合配流相较于两编组站单独配流,可使满轴列车总数增加1列、站存车总数减少13辆、配流总代价降低5.4%,从而达到更佳的配流效果。 展开更多
关键词 铁路运输 配流 技术站 协同 混合整数非线性规划
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深圳市轨道交通车站与土地利用互动性研究
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作者 李云 刘泓昆 +3 位作者 胡慧敏 巩科麟 张亚男 殷子渊 《深圳大学学报(理工版)》 CAS CSCD 北大核心 2024年第4期395-405,共11页
城市轨道交通与土地利用发展相互影响,两者协调发展有助于缓解城市交通拥堵,是城市可持续发展的关键问题之一.利用中国深圳市1999年与2015年的建筑普查、土地利用以及轨道交通车站刷卡数据,从开发强度、用地信息熵、车站类型及早晚高峰... 城市轨道交通与土地利用发展相互影响,两者协调发展有助于缓解城市交通拥堵,是城市可持续发展的关键问题之一.利用中国深圳市1999年与2015年的建筑普查、土地利用以及轨道交通车站刷卡数据,从开发强度、用地信息熵、车站类型及早晚高峰客流量等多个指标精细化分析轨道交通车站运能与周边土地利用之间的内在联系,并引入“节点-场所”模型构建指标体系评价轨道交通车站与土地利用间的发展协调程度,利用k-means聚类分析将二者协调状态划分为从属状态、平衡状态及失衡状态.结果表明,随着轨道交通车站开发建设,深圳市轨道交通车站周边土地集约利用水平提高;车站客流量与周边土地利用指标的相关性显著,全天客流量与容积率和商办建筑面积显著正相关,早高峰客流量与居住建筑面积和建筑密度显著正相关,而与容积率显著负相关,晚高峰客流量则与商办建筑面积和道路网密度显著正相关.深圳市轨道交通车站与站点周边土地利用协调发展水平偏低,站点类型以节点和场所价值低度均衡发展的从属状态为主,而协调状态则较少且集中分布在中心区圈层.未来应进一步对失衡节点地区采取针对性的开发策略,提升集聚效应与服务水平. 展开更多
关键词 城市交通 轨道交通车站 土地利用 “节点-场所”模型 协调关系 客流量 深圳
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