• Title/Summary/Keyword: railway safety case

Search Result 306, Processing Time 0.024 seconds

A Case Study on System Assurance for Platform Screen Door in Urban Transit (도시철도 승강장 스크린도어의 시스템보증 사례 연구)

  • Lee, Hwan-Deok;Jung, Won
    • Journal of Applied Reliability
    • /
    • v.13 no.4
    • /
    • pp.287-298
    • /
    • 2013
  • This paper presents a case study of PSD(Platform Screen Door) system assurance based on EN50126 life-cycle stage. By applying this system assurance, the accidents related to urban light transit railway especially that caused casualties could be reduced tremendously. This case study contributes significantly to the reliability, availability, maintainability and safety of the PSD system. Request For Proposal (RFP) of a rail road operator in which required by RAMS is prepared in which to ensure all system assurance activity and safety assessment are compulsory. The step-by-step activities and related deliverables are used which include functional analysis, FMECA, hazard identification analysis, system hazard analysis, maintainability analysis, FRACAS, and finally verification and validation of the system.

Optimum Design of Prestressed Concrete Girder Railway Bridge II : Optimum Section with 30m Span Length Accounting for Dynamic Stability (프리스트레스트 콘크리트 거더 철도교의 최적설계 II: 동적안정성을 고려한 30m 지간의 최적단면)

  • Lee Jong-Min;Kim Su-Hyun;Jung Jae-Dong;Lee Jong-Sun;Cho Sun-Kyu
    • Journal of the Korean Society for Railway
    • /
    • v.9 no.1 s.32
    • /
    • pp.102-109
    • /
    • 2006
  • The PSC girders which currently used at highway bridge have the standard cross sections about 25m, 30m and 35m span. Thus, in case of highway bridge design, the bridge designer can choose the adequate standard cross section according to constructional condition. However, in railway bridge design, there are limitations on reasonable bridge design considering circumstances of a construction site and conditions of location etc, because the PSC girders used at railway bridge have the cross section about only 25m span length. In this study, the optimum design for the PSC girder railway bridge with 30m span length has been performed. Also, in order to investigate the dynamic stability of railway bridge using the optimum section of PSC girder, dynamic analysis has been carried out. From the results of analysis, it is suggested to denote the optimum section which satisfied the structural safety, dynamic stability and economical efficiency all together.

A Study on the Running Safety by F26 Turnout and Vehicle Model (F26 분기기 및 열차모델을 이용한 주행안전성 연구)

  • Kim, Sung-Jong;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
    • /
    • v.12 no.6
    • /
    • pp.859-864
    • /
    • 2009
  • When the vehicle passes through turnout, the design is required to minimize the change of lateral force. Therefore, in case the vehicle passed the through turnout, we ought to execute dynamic analysis of the interaction between the vehicle and turnout in order to make an estimate of the lateral force and the derailment coefficient on the turnout. In this paper, we established the analytical model of the vehicle and turnout and analysed running safety when the vehicle passes through turnout in order to improve running safety of the vehicle on turnout. Also, to verify the vehicle and turnout model, we analysed reaction force and running behavior between wheel and rail, and running safety of the vehicle by changing cradle part and the tongue rail when the vehicle passes through turnout.

Study on aptitude test on engineers for preventing subway safety accidents (지하철 안전사고 방지를 위한 기관사의 적성관리 연구)

  • Lee, Tai-Sik;Lee, Kkoch-Nim;Kim, Jang-Un;Kim, Chul-Soo
    • Proceedings of the KSR Conference
    • /
    • 2007.05a
    • /
    • pp.1193-1198
    • /
    • 2007
  • The total number of passengers for Line $1{\sim}4$ operated by Seoul Metro among subways that act as foot of Seoul residents was 1.43116 billion passengers in 2006 and average of 3.921 million passengers per day. The results of analysis on safety accidents that occurred recently in subways show that various complaints on subways were reduced through the expansion of safety related facilities and training but accidents caused by negligent handling by employees including engineers are increasing on the contrary. At present time where various man-made accidents break out such as wrong handling and habits of engineers in charge of driving trains and momentary mistakes, there needs effort for active management and improvement to prevent and minimize accidents. Therefore, this study has drawn out problems through surveys on aptitude test system to engineers and compared with case studies in overseas. Thus, it attempted to minimize safety accidents in subways, and derived methods for improving safety management by focusing on improving the current aptitude test system for nurturing engineers suitable to handle railway driving in the future.

  • PDF

A study on the Stability of Rail way Construction on the Reclaimed Land for Domestic Marine Clay Using the Seismic Analysic (연약지반상 지진하중을 고려한 철도노반의 안정성 검토에 관한 연구)

  • Kim Young-Soo;Kim Moo-Ill
    • Proceedings of the KSR Conference
    • /
    • 2004.10a
    • /
    • pp.1071-1076
    • /
    • 2004
  • The purpose. in this study. is to analyze liquefaction potential of Inchon International Airport at the Area Phase ' I ' for Railway Construction of all, seismic response was analyzed using the computer program, Shake91. Four methods proposed by Seed & Idriss. Eurocode, Iwasaki & Tatsuoka. and Ishihara were used for assessment of liquefaction potential and safety factors calculated form these methods are compared. Based on the results of seismic response analysis, the maximum acceleration at the ground surface is larger than that evaluated site factor effect by using site factor because these areas are composed of very loose sand clay. Especially, in the case of analysis with long period earthquake data. it is appeared that the acceleration of earthquake is amplified more largely. Therefore, accurate seismic response analysis is suggested for the design on the important structures on reclaimed land. The analytical results of liquefaction potential show that the increments of N-value and effective overburden pressure with remediation make safety factors increase. Through comparing the safety factors evaluated from four method, the safety factor calculated by See & Idriss method in the lowest one and it is found that the SPT N-value effect the safety factor very largely. And, Iwasaki & Tatsuoka method is affected by various factors such as average grain size. fine contents, confining pressure. In conclusion. to minimize earthquake Risk by liquefaction, the efficient remediation is essential and seismic response analysis should be carride out.

  • PDF

Evaluation of Running Safety and Ride Comfort for High Speed Train in Cases of Superimposition of Vertical and Horizontal Curves (종곡선과 평면곡선의 경합조건별 차량주행안전성 및 승차감 평가)

  • Um, Ju-Hwan;Choi, IL-Yoon;Kim, Man-Cheol
    • Journal of the Korean Society for Railway
    • /
    • v.16 no.4
    • /
    • pp.311-317
    • /
    • 2013
  • In railway construction, superimposition of horizontal and vertical curves has critical effects on the running stability and the ride comfort of vehicles as well as on construction costs. In this study, running safety, ride comfort, and track acting forces were analyzed by a numerical analysis using the VAMPIRE program according to cases of superimposition of vertical and horizontal curves. From the analysis results, it was found that running safety, riding comfort, and track acting forces in the case of superimposition of vertical and horizontal curves as well as vertical and transition curves meet all of the criteria. Also, in the case of the superimposition of vertical curves and curvature change between horizontal transition curves and circular curves meet all of the criteria.

Railway Governance and Power Structure in China

  • Lee, Jinjing
    • International Journal of Railway
    • /
    • v.1 no.4
    • /
    • pp.129-133
    • /
    • 2008
  • Over the last $15{\sim}20$years, many countries have adopted policies of railway privatization to keep up with increasing competition from road and air transport. Although each country and case has its own history, market characteristics, political context as well as administrative process, railway privatizations (including railway restructure, concession etc.) in the west usually are accompanied with the establishment of new regulatory regimes. Therefore, railway governance has been innovating towards an interaction of government, regulator, industry bodies, user groups, trade unions and other interested groups within the regulatory framework. However, it is not the case in China. Although China had seen a partial privatization in some branch lines and is experiencing a much larger-scale privatization by establishing joint-ventures to build and operate high-speed passenger lines and implementing an asset-based securitization program, administrative control still occupies absolutely dominant position in the railway governance in China. Ministry of Railway (MOR) acts as the administrator, operator as well as regulator. There is no national policy that clearly positions railway in the transportation network and clarifies the role of government in railway development. There is also little participation from interested groups in the railway policy making, pricing, service standard or safety matter. Railway in China is solely governed by the mere executive agency. Efficiency-focused economic perspective explanation is far from satisfaction. A wider research perspective from political and social regime is of great potential to better explain and solve the problem. In the west, separation and constrains of power had long been established as a fundamental rule. In addition to internal separation of political power(legislation, execution and jurisdiction), rise of corporation in the 19th century and association revolution in the 20th century greatly fostered the growth of economic and social power. Therefore, political, social and economic organizations cooperate and compete with each other, which leads to a balanced and resonable power structure. While in China, political power, mainly party-controlled administrative power has been keeping a dominated position since the time of plan economy. Although the economic reform promoted the growth of economic power of enterprises, it is still not strong enough to compete with political power. Furthermore, under rigid political control, social organizations usually are affiliated to government, independent social power is still too weak to function. So, duo to the limited and slow reform in political and social regime in China, there is an unbalanced power structure within which political power is dominant, economic power expanding while social power still absent. Totally different power structure in China determines the fundamental institutional environment of her railway privatization and governance. It is expected that the exploration of who act behind railway governance and their acting strength (a power theory) will present us a better picture of railway governance as a relevant transportation mode. The paper first examines the railway governance in China and preliminarily establishes a linkage between railway governance and its fundamental institutional environment, i.e. power structure in a specific country. Secondly, the reason why there is no national policy in China is explored in the view of political power. In China, legislative power is more symbolic while party-controlled administrative power dominates political process and plays a fundamental role in Chinese railway governance. And then, in the part three railway finance reform is analyzed in the view of economic power, esp. the relationship of political power and economic power.

  • PDF

Software Quality Assurance Activities of Automatic Train Control System to meet Requirements of the IEC 62279 Standard (IEC 62279 요구사항 충족을 위한 열차제어시스템의 소프트웨어 품질보증 활동에 관한 연구)

  • Shim, Kyu-Don;Lee, Jong-Woo
    • Journal of the Korean Society for Railway
    • /
    • v.13 no.4
    • /
    • pp.412-418
    • /
    • 2010
  • This paper presents the methods to acquire the Safety Certificate from Independent Safety Assessment based on the IEC standard62279 which is commonly applied to railway system for Automatic Train Control(ATC) system in accordance with Urban Maglev project. This also shows approach methods and relative activities for project life- cycle to accomplish and ensure the system requirements of ATC system, RAMS and S/W quality activities. Furthermore, the key tasks conducted with ISA are noted in detail. These kind of activities for software quality of ATC system to obtain S afety Certificate could be a CASE model to improve the quality of domestic railway system and products, and also contribute to the growth of railway business and toward the achievement of overseas' railway signaling markets.

The Heat Release Rate Comparison of Subway car's Interior Materials using Cone Calorimeter (콘칼로리미터를 이용한 도시철도차량 내장재료별 발열량 비교)

  • Lee Cheul-kyu;Lee Duck Hee;Jung Woo Sung
    • Proceedings of the KSR Conference
    • /
    • 2005.05a
    • /
    • pp.70-76
    • /
    • 2005
  • The interior materials of the urban subway car in operation are now being changed to new materials that meet the latest law in effect, the fire safety criteria of the urban railway vehicle. It was well known fact that the composite materials, that were applied to last subway car, were weak on the fire. Contrary to this materials, materials in work have good resistance to the fire. On the paper, To investigate the difference of fire safety level on the subway car, cone calorimeter was used to measure the heat release rate and total heat released according to the ISO 5660. A high radiative heat flux of 50kW/m2 was used to burn out all materials and to simulate the condition of fully developed fire case in the tests.

  • PDF

The Numerical Analysis off the Flow-field Around the Korean Tilting Train Express (한국형 틸팅 열차 주위 유동장 수치 해석)

  • 윤수환;김태윤;고태환;권혁빈;이동호
    • Journal of the Korean Society for Railway
    • /
    • v.7 no.3
    • /
    • pp.193-199
    • /
    • 2004
  • Numerical analysis of aerodynamic characteristics was differently performed according to the running situation of the Korean Tilting Train eXpress(TTX) that would be introduced for an improvement in efficiency of the used railroad track. Fluent 6.0 was used for the analysis of Non-tilting case, Tilting case and Passing-by case with the model of TTX. As a result, the aerodynamic drag had little difference between Tilting and Non-tilting case. However, pressure contour under the train of Tilting case was not symmetry because the gap between a train and the ground was different at both sides. In Passing-by case attraction and counterattraction occurred alternately and affected to the opposite train. When two trains were side by side, the maximum attraction was generated especially. Through an analysis of pressure wave in tunnel a large variation of pressure was generated by the bluff nose of TTX. The results in this study would be good data for the aerodynamic characteristic on TTX and provide important information to judgment of running safety.