Computers in Railways XVI : Railway Engineering Design and Operation最新文献_第2页

AN INVESTIGATION INTO THE BENEFITS AND CONSTRAINTS OF SHIFTING FREIGHT TRAFFIC FROM ROADS ONTO HIGH-SPEED RAILWAYS 关于将货物运输从公路转移到高速铁路的好处和限制的调查

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180481

I. Watson, A. Ali, A. Bayyati

{"title":"AN INVESTIGATION INTO THE BENEFITS AND CONSTRAINTS OF SHIFTING FREIGHT TRAFFIC FROM ROADS ONTO HIGH-SPEED RAILWAYS","authors":"I. Watson, A. Ali, A. Bayyati","doi":"10.2495/CR180481","DOIUrl":"https://doi.org/10.2495/CR180481","url":null,"abstract":"© 2019 WIT Press. The environmental, economic and social impacts associated with the continuing increase in the global freight transport has necessitated more than ever the need for a more effective and sustainable freight transport system. High Speed Railways (HSR) may provide the solution as they have the ability to move goods quickly, safely and economically which can sufficiently improve the trade links within vast regions such as the European Union and extend that to Asian countries. The major issues concerning freight transport are greenhouse gas emissions and dependency on fossil fuel which mean that railway freight transport particularly HSR freight would be the most competitive mode. Many countries have invested in developing HSR but at present, HSR is more regularly used for passengers than for freight although there are an increasing number of countries who operate HSR freight services. Some HSR systems are not profitable as the demand for travel is not sufficient and there is a significant larger haulage capacity available, and thus they need additional funding from governments. Shifting freight from roads onto railways will improve the economic performance of HSR, reduce the amount of fuel used by the transport industry and reduce the greenhouse gas emission. This research considers the future trends and possibilities of shifting freight from roads to HSR lines and analyses the operational and technological constrains concerning freight traffic and the corresponding capabilities of HSR. Most of the data and information used in the research are gathered from relevant online sources including in depth research of the HSR in selected countries, available railway statistics and European and Institutional publications. The expected outcome of this research may contribute to developing more suitable means to improve the economic, environmental and social sustainability of HSR particularly for freight transport.","PeriodicalId":210834,"journal":{"name":"Computers in Railways XVI : Railway Engineering Design and Operation","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134458488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

CONTRIBUTION TO THE MODIFICATION OF INPUT DATA OF SUBGRADE STRUCTURE DIMENSIONING FOR NON-TRAFFIC LOAD ACCORDING TO THE ŽSR METHODOLOGY 根据Žsr方法对非交通荷载下路基结构尺寸输入数据的修改做出贡献

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180221

L. Ižvolt, P. Dobeš, Juraj Pieš

引用次数: 2

ENHANCED EFFICIENCY IN RAILWAY DRIVING: DEVELOPMENT OF ECOS (ENERGY CONSUMPTION OPTIMIZATION SOFTWARE) TOOL 提高铁路驾驶效率:开发ecos(能耗优化软件)工具

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/cr180011

F. Ariza, J. Mera, E. Castellote, I. Gómez-Rey

{"title":"ENHANCED EFFICIENCY IN RAILWAY DRIVING: DEVELOPMENT OF ECOS (ENERGY CONSUMPTION OPTIMIZATION SOFTWARE) TOOL","authors":"F. Ariza, J. Mera, E. Castellote, I. Gómez-Rey","doi":"10.2495/cr180011","DOIUrl":"https://doi.org/10.2495/cr180011","url":null,"abstract":"Railway transport consumes large amount of energy and fuel every year. Increasing environmental concern and raising prices in diesel fuel and electrical energy has resulted in optimization techniques being a must for railway systems. This paper aims to explain the development of a software tool able of calculating the optimal consumption speed profile for a train service within a given topology and timetable. It also shall provide when and what actions (powering, braking, holding speed or coasting) the driver should follow for achieving it. Historically these objectives have been approached using computer algorithms based on very simplified models or dynamic programming, resulting in unrealistic or restrictively slow frameworks. We propose a really fast and accurate methodology based on Optimal Control theory. The problem is formulated as a differential system of equations stating train dynamics constraint by track features, as permitted speed or slope value in the various sections. Analytical solution for such a system of equations is not suitable due to its strictly non-linearity, being necessary the application of fast convergence iterative methods as the Interior Point method based on logarithm barrier penalty functions. Several real-life scenarios have been tested using the explained tool and its output have been compared with validated results, having achieved a high degree of accuracy and speed. Accordingly is valid to conclude that this approach can be used to develop a Driver Advisory System for real trains.","PeriodicalId":210834,"journal":{"name":"Computers in Railways XVI : Railway Engineering Design and Operation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126136946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

COMMON MODE VOLTAGE SUPPRESSION METHOD BASED ON MODEL PREDICTIVE CONTROL FOR A PERMANENT MAGNET SYNCHRONOUS MOTOR CONSIDERING CURRENT ERROR LIMIT 考虑电流误差限制的永磁同步电机模型预测控制共模电压抑制方法

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180101

Xiaofan Wang, Xiaochun Fang, F. Lin, Zhongping Yang

引用次数: 0

RESEARCH ON UNDERGROUND TUNNEL INTELLIGENT LIGHTING CONTROL TECHNOLOGY FOR ENERGY SAVING RAILWAY SYSTEM 面向铁路节能系统的地下隧道智能照明控制技术研究

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180061

Jong-Kwang Park, Kyeongsik Kim, Jung-Wook Park, Buseok Kwon, Chang-Sik Kim, Jung Ho Kim, Jae-Min Kim, Woo-jin Jang

引用次数: 1

ULTRA-HIGH FREQUENCY TRAIN OPERATION USING THE SOFT COUPLING TECHNIQUE: HEADWAY EVALUATIONS 采用软耦合技术的超高频列车运行:车头距评价

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180121

Fumitaka Kakuhama, R. Takagi

{"title":"ULTRA-HIGH FREQUENCY TRAIN OPERATION USING THE SOFT COUPLING TECHNIQUE: HEADWAY EVALUATIONS","authors":"Fumitaka Kakuhama, R. Takagi","doi":"10.2495/CR180121","DOIUrl":"https://doi.org/10.2495/CR180121","url":null,"abstract":"The level of congestion observed in urban railways during peak hours is unacceptably high, and there is a strong need for quick improvement. One possible method to alleviate congestion without largescale investment in railway infrastructure (e.g. increasing tracks) is the realisation of “soft coupling”. This is a concept in which the space between two moving trains is controlled to an extremely short distance so that these two trains look as if they were mechanically coupled. The purpose of this study is to evaluate the limits of the transport capacity of urban railways when soft coupling is applied. Although it is expected that ultra-high frequency train operation will be possible by using this technique, there is a danger that these two trains would collide with each other when doing so. To avoid the problem, deceleration parameters of trains must be set properly. In this paper, the authors first search for the appropriate set of deceleration parameters by means of simplified braking performance calculations. Following this, the authors evaluate the possibility of increasing train frequency by using this technique. Especially, the authors reveal that it is possible to reduce headways between two trains that are running in the same direction and calling at the same platform in a station even further by using soft coupling, when compared with the cases using either pure moving block (PMB), relative moving block (RMB), a new variant of continuous ATP used in Japan (called Digital ATC) and another conventional variant of continuous ATP used in Japan (called ATS). By comparing all five types of signalling systems, it can be concluded that soft coupling can greatly contribute to shortening the headways between trains.","PeriodicalId":210834,"journal":{"name":"Computers in Railways XVI : Railway Engineering Design and Operation","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121042932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

ANALYSIS OF TEMPORAL FACTORS INFLUENCING MINIMUM DWELL TIME DISTRIBUTIONS 影响最小停留时间分布的时间因素分析

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180401

Timothy Pedersen, T. Nygreen, A. Lindfeldt

{"title":"ANALYSIS OF TEMPORAL FACTORS INFLUENCING MINIMUM DWELL TIME DISTRIBUTIONS","authors":"Timothy Pedersen, T. Nygreen, A. Lindfeldt","doi":"10.2495/CR180401","DOIUrl":"https://doi.org/10.2495/CR180401","url":null,"abstract":"The minimum dwell time is an important part of railway timetable planning. Due to its stochastic behaviour, the minimum dwell time should be considered to create resilient timetables. While there to our knowledge has been significant focus on how to determine and estimate dwell times, little research has been carried out regarding temporal and running direction variations of these. In this paper we examine how the minimum dwell time varies depending on temporal factors such as the time of the day, day of the week and time of the year. We also examine how it is affected by running direction and station type. The minimum dwell time is estimated by means of track occupation data. A method is proposed to ensure that only minimum dwell times and not planned dwell times are acquired from the track occupation data. The results show that on an aggregated level, the average minimum dwell times in both running directions at a station are similar. However, when temporal factors are considered, there are significant variations. The minimum dwell time varies throughout the day with peak hours having the longest dwell times. It is also found that the minimum dwell times are influenced by weekday, and in particular weekends are found to have lower minimum dwell times than most other days. The findings show that there is a potential to significantly improve timetable planning by taking minimum dwell time variations into account.","PeriodicalId":210834,"journal":{"name":"Computers in Railways XVI : Railway Engineering Design and Operation","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121960207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

OPTIMISATION OF CONCRETE SLEEPER DESIGN FOR HEAVY HAUL OPERATED RAILWAY TRACK BY NON-LINEAR FINITE ELEMENT AND EMPIRICAL STUDIES 重载轨道混凝土轨枕设计的非线性有限元优化与实证研究

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180421

Ralph Zhang, Helen Wu, Richard Yang

引用次数: 0

THE CLAMP FORCE CONTROL OF TRAIN ELECTRO-MECHANICAL BRAKE DEVICE ON SELF-ADAPTATION CONTROL 基于自适应控制的列车机电制动装置夹紧力控制

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/CR180091

Lei Chi, Wu Mengling

引用次数: 0

COMPARISON OF CONVENTIONAL AND ACOUSTIC IMPACT ECHO TESTS FOR DETECTING A CAVITY UNDERNEATH A CONCRETE SLAB TRACK 混凝土轨道板下空腔检测的常规与声冲击回波试验比较

Computers in Railways XVI : Railway Engineering Design and Operation Pub Date : 2018-07-02 DOI: 10.2495/cr180441

Yujin Lim, Seongbaek Park, Hojin Choi, Jaehak Park

{"title":"COMPARISON OF CONVENTIONAL AND ACOUSTIC IMPACT ECHO TESTS FOR DETECTING A CAVITY UNDERNEATH A CONCRETE SLAB TRACK","authors":"Yujin Lim, Seongbaek Park, Hojin Choi, Jaehak Park","doi":"10.2495/cr180441","DOIUrl":"https://doi.org/10.2495/cr180441","url":null,"abstract":"Many types of unstable conditions of railway tracks including various modes of irregularities can be produced when cavities are generated exactly underneath a concrete slab track or a slight open space is made under a loose sleeper. The cavities can be generated due to various reasons such as settlements of badly compacted soil or soft soil or drastic change of track stiffness in transition zones near bridge abutment. The loose sleeper embedded in the concrete slab can also produce very undesirable problems including noise, vibration of track and unexpected response between railway car and track structure. Nonetheless, there are currently no useful and effective detecting methods for investigating the cavity presence underneath the railway concrete slab track and the loose sleeper embedded in the slab. In this study, a comparative study is performed for detecting the cavity and checking the condition of the loose sleeper by adapting conventional impact echo test and acoustic impact echo test on the concrete slab surface. It is confirmed that these two NDT methods can be discriminately adaptive techniques for detecting the problematic abnormalities in a concrete slab track. A test bed composed of a rectangular concrete slab with various sizes and height of cavity is built in the backyard for proof test. Detecting algorithm and processing program are developed and proposed based on wavelet and FFT of the obtained data. Acoustic impact echo test is proved to be effective and practical to detect a cavity underneath the concrete slab track. In addition, it is found that conventional impact echo test is also effective and useful to detect loose sleepers embedded in the concrete.","PeriodicalId":210834,"journal":{"name":"Computers in Railways XVI : Railway Engineering Design and Operation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131678787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2