• Title, Summary, Keyword: Railway

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Evaluation for the Running Safety and Ride Comfort of Steel Composite Railway Bridge (강합성 철도교량의 주행안전성 및 승차감 평가)

  • Kim, Jung-Hun;Kang, Young-Jong;Kim, Dea-Hyeok;Han, Sang-Yun;Cha, Kyung-Ryul
    • Proceedings of the KSR Conference
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    • pp.2814-2820
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    • 2011
  • Railway bridge, contact of vehicle needs to design considering the running safety about the running train load of the railway bridge, ride comfort and dynamic safety. Also, upper structure of the railway bridge has to satisfy design standard about moving load(train). So, the railway bridge has to satisfy the requirement for vertical acceleration of the bridge deck, vertical displacement of the bridge and face distortion, which is suggested railway design standard in Korea(2011.5.). In this study, it was investigated and evaluated to the running safety about the running train load of the railway bridge, ride comfort and dynamic safety with railway design standard for steel composite(Steel Box Girder) railway bridge considering KTX, freight train and standard train load.

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Dynamic Modeling of a Railway Vehicle under Braking (제동시의 철도차량을 위한 동적모델)

  • Park, Joon-Hyuk;Goo, Byeong-Choon
    • Journal of the Korean Society for Railway
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    • v.10 no.4
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    • pp.431-437
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    • 2007
  • This paper describes the dynamic modeling of a railway vehicle when it is under braking force. It is important for the enhancement of braking performance to establish a proper dynamic model of a railway vehicle because the braking performance is affected by some dynamic forces generated by a railway vehicle when it undergoes braking. In this paper, a dynamic model for one vehicle is suggested to compute the dynamic behavior of a railway vehicle in the HILS(Hardware In-the-loop Simulation) system for the railway vehicle braking devices. To simplify the dynamic model, friction between a wheel and a rail is assumed that there exist only the static and the dynamic friction forces. Static friction coefficient is also assumed to be a function of the running speed. Some simulations are carried out with various braking forces, and the braking characteristics according to the change of the braking force are discussed. This study can provide some fundamental results to construct the HILS system for braking devices of a railway vehicle.

Computerized Railway Alignment Evaluation and Construction Quantity Estimation (궤도선형 계산 및 수량 산출 프로그램 개발)

  • Jee Sang Bok;Lee Tai Sik;Lee Dong Wook
    • Journal of the Korean Society for Railway
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    • v.8 no.4
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    • pp.379-384
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    • 2005
  • To maintain the stability during the operation of railway vehicle, the perfect installation of rail, namely the orbit as well as the performance of the railway vehicle itself is required. The orbit of railway needs the intensity and elasticity that stands the shock and vibration due to the weight of the railway vehicle enough, Also, the driving safety during the operation of vehicle should be guaranteed, comfortable feeling of the passenger should be maintained, and the influence of the noise and vibration to the environs should be minimized. Therefore, it is necessary to develop a program that calculates the change of construction cost according to the selection of railway orbit. This study introduces the orbit design automation program according to the selection of railway orbit, and discuss the principle and the way to use of the program.

Deductions of KPIs for BSC and Process KPIs for BPM in Railway Construction (철도건설에서 BSC의 KPI도출과 BPM을 위한 프로세스 KPI도출)

  • Ryu Si-Wook;Ahn Byung-Jun;Ryu Myung-Wook
    • Journal of the Korean Society for Railway
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    • v.9 no.4
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    • pp.388-393
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    • 2006
  • Recently, Korean government demands that public sectors like railway construction should improve their management efficiency. It is necessary for railway construction supported by government budget to aim at the companywide management efficiency. The Balanced Scorecard (BSC) is known as integrated performance management framework that helps a company to translate strategic objective info relevant performance within an organization. This paper focuses on relationship between KPIs (Key Performance Indicators) used to measure the performance of railway construction industry and process KPT for BPM (Business Process Management). Also, the vision and strategies of the railway construction is introduced, and the CSFs (Critical Success Factors) and the KPI based on BSC is developed. Finally, this paper explores that there is a possibility to fulfill the strategic objectives of railway construction industry through the connectivity between KPI based on BSC and process KPI based on BPM. We explain the detailed procedures with an example of railway construction industry.

Development of the Assessment Indicators for Railway Safety

  • Song, Bo-Young;Moon, Dae-Seop;Lee, Hi Sung
    • International Journal of Railway
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    • v.5 no.4
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    • pp.175-181
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    • 2012
  • This study proposes a model for railway safety assessment with which the safety of whole railway system can be evaluated. The purpose of the assessment model is to generate safety indicators which quantitatively represent the degree of railway safety. Safety indicators were proposed as three indicators according to their functions; accident indicators, safety management indicators, and safety culture indicators. This paper describes the first result on the safety target which will be a key starting point toward the development of safety assessment model. It is recommended that the safety target to be composed of several sub-targets are apportioned to constituent components. It is concluded that the classification of safety target has influence on deciding components or attributes that constitute each sub-indicators; accident indicators, safety management indicators, and safety culture indicators. Based on this study, a railway safety assessment model will be developed in the following study.

An improved algorithm in railway truss bridge optimization under stress, displacement and buckling constraints imposed on moving load

  • Mohammadzadeh, Saeed;Nouri, Mehrdad
    • Structural Engineering and Mechanics
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    • v.46 no.4
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    • pp.571-594
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    • 2013
  • Railway truss bridges are amongst the essential structures in railway transportation. Minimization of the construction and maintenance costs of these trusses can effectively reduce investments in railway industries. In case of railway bridges, due to high ratio of the live load to the dead load, the moving load has considerable influence on the bridge dynamics. In this paper, optimization of the railway truss bridges under moving load is taken into consideration. The appropriate algorithm namely Hyper-sphere algorithm is used for this multifaceted problem. Through optimization the efficiency of the method successfully raised about 5 percent, compared with similar algorithms. The proposed optimization carried out on several typical railway trusses. The influences of buckling, deformation constraints, and the optimum height of each type of truss, assessed using a simple approximation method.

Railway Organizational Change - Swedish Railway Case (철도조직변화 스웨덴 사례)

  • Bhang Youn-keun;Moon Dae-seop
    • Proceedings of the KSR Conference
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    • pp.534-539
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    • 2005
  • This article introduces a railway organizational change of the Swedish Railway Case written by Petra Stelling. Through the Swedish Railway organizational change case we know that issues such like functionalism vs. regionalism, dividing rolling' stock department, and separating divisions are solved in the organizational designs. Swedish experience could give some hints to Korail organization change efforts.

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The Study on the construct of transportation System in Railway focus (철도중심교통체계구축에 관한 연구)

  • Kim, Jung-Phyung
    • Proceedings of the KSR Conference
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    • pp.768-774
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    • 2011
  • To establish transportation system in railway focusing truly, we should plan route and invest continuously to consider the means of railway's functional sides. And it should be inter-modal system. Therefore this study concentrates on high-speed railway and considers the construct of transportation system in railway focus on the supplier aspect.

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A Study on Standard Monitoring Process in Development of High Speed Railway Vehicle (고속철도차량기술개발 표준 모니터링 절차에 대한 고찰)

  • Park, Min-Heung;Kim, Beom-Jin;Kim, Chul-Su;Choi, Deuck-Ho
    • Proceedings of the KSR Conference
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    • pp.528-535
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    • 2011
  • According to railway safety regulations for securing the railway vehicle's quality and performance, it can be partly exempted that the performance tests and production inspections on the railway vehicles which are produced and assembled for the purpose of test and research. The reasons of this exemption are for ensuring maximum autonomy and for saving time considered the development period of railway vehicle. However, it was continuously demanded the necessity of supplementation on the confirmation about railway vehicle's quality & performance. Therefore, we added "The monitoring step" which is for securing the quality and performance in high speed railway vehicle's subsystem & compartment to supplement those tests & inspections in development. In this paper, based on a standard ABS(Activity Breakdown Structure) of railway vehicle and a WBS(Work Breakdown Structure) of the railway vehicle system, we investigate the necessity of monitoring in the High speed railway vehicle development. And by comparing and analyzing the essential requirements of international standard, IRIS(International Railway Industry Standard) & TSI(Technical Specification for Interoperability), we try to examine a standard monitoring procedure.

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Comparative Analysis on the Railway Construction Criteria with Regard to the Trans-Korea Railway Project and the Railway Modernization of DPRK (남북철도 현대화를 위한 남북한 철도건설기준 비교 분석)

  • Kim, Sang-Gyun
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.1011-1017
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    • 2009
  • In pursuit of the Trans-Korea Railway (TKR) project connecting the Korean peninsular by a rail link, it is critical that the two railway systems in ROK and DPRK are comparable in criteria and standards. Yet, there is substantial divergence of the construction criteria between the two sides, which hinders from conducting the TKR project as well as the railway modernization of DPRK. In this regard, study and comparison of the criteria are a prerequisite for mitigating the hinderance. This study investigated the laws and regulations relating to the railway technologies and construction and in particular conducted a comparative analysis of both railway systems with a focus on railway facilities such as track, structures, electric power and signaling. The results of this study will provide a useful information for the improvement of existing lines and the construction of new lines in DPRK.