• Title/Summary/Keyword: 궤도유지보수

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Evaluation of Maintenance Quantity and Life Cycle Costs of Railway Track Considering Evolution of Rail Fatigue Damage and Ballast Settlement According to Track Quality Level (궤도 품질수준에 따른 레일 피로 손상과 자갈 침하 진전을 고려한 철도 궤도 보수량 및 수명주기비용 평가)

  • Jun-Hyuck Choi;Seung-Yup Jang;Seung-Won You;Do-Yeop Kim;Hyung-Jo Kim
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.28 no.4
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    • pp.37-47
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    • 2024
  • This study proposes a track maintenance quantity estimation model that considers evolution of rail fatigue damage and ballast settlement based on actual maintenance data from the Gyeongbu high-speed railway, and revises the existing life cycle cost (LCC) model for railway track. Using this model, maintenance quantities and life cycle costs based on different track quality levels are evaluated and discussed. According to the results, it is confirmed that applying the track maintenance quantity estimation model that accounts for rail fatigue damage and ballast settlement allows us to reasonably estimate maintenance costs close to the actual data. The track quality coefficient significantly influences both rail and ballast maintenance quantities, with ballast maintenance having a greater impact than rail maintenance. Additionally, as train speed increases, both rail and ballast maintenance quantities rise. Moreover, a higher track quality coefficient leads to a steeper increase in maintenance quantities with increasing train speed. Consequently, LCC also exhibits a faster growth rate over time with higher track quality coefficients and faster train speeds, resulting from an increased proportion of maintenance costs.

Study on the Appropriateness of Track Maintenance Works through the Evaluation of Trackbed Conditions (도상 및 노반상태 평가를 통한 궤도유지보수작업의 적정성 연구)

  • Kim, Dae-Sang;Kwon, Soon-Sup;Lee, Su-Hyung;Hwang, Seon-Keun;Park, Tae-Soon
    • Journal of the Korean Society for Railway
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    • v.11 no.3
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    • pp.334-341
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    • 2008
  • Ballast track needs maintenance works because it is supported by the compressible trackbed and subgrade layers. Maintenance works are essential to secure riding comfort and extend the life cycle of it. The necessities of maintenance works are determined from track irregularities measured by EM120. Track irregularities is the results of the track deformation. Therefore, it is natural to evaluate the cause of it. This paper focuses on the points the track irregularities come from the trackbed and the subgrade. Nondestructive techniques, such as Ground Penetrating Radar (GPR) and Portable Falling Weight Deflectometer (PFWD) are applied to evaluate the trackbed conditions, ballast layer thickness and vertical track stiffness, in the test section 500m long of Gyungbu line. The trackbed investigation results are compared with the track irregularities measured by EM120 and maintenance works. Conclusively, it was found that some maintenance works were unnecessary on the test section.

유지 보수의 입장에서 본 궤도 기술의 현상과 과제

  • 서사범
    • Journal of the Korean Society for Railway
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    • v.5 no.2
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    • pp.27-33
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    • 2002
  • 궤도의 역할은 열차 하중을 지지하고, 이것을 분산시켜 구조물에 전달함과 동시에 열차의 주행을 위한 원활한 (안전하고 승차감이 좋은) 안내로를 제공하는 것이다. 그러나, 궤도는 열차의 반복 주행에 의하여 구성 재료의 열화ㆍ손상이나 궤도 틀림의 진행이 부득이 하므로 일상적인 궤도정비 작업이나 재료교환 작업을 피할 수 없기 때문에 될 수 있는 한 적은 보수비로 열차 주행에 필요한 궤도 품질을 실현하는 기술의 확립이 궤도 기술에 관한 연구 개발의 최대 사명이다. 궤도 보수에 관계하는 비용은 크게 세 가지로, 즉 궤도 재료의 교환ㆍ보수 작업, 궤도 틀림의 정비 작업, 각종 검사나 유간 정정 등의 기타 작업으로 대별할 수 있다. (중략)

Optimal Vertical Stiffness of Fastener of Concrete Track in High-Speed Railway (고속철도 콘크리트궤도 체결구 최적 수직강성)

  • Yang, Sin-Chu
    • Journal of the Korean Society for Railway
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    • v.18 no.1
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    • pp.43-52
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    • 2015
  • In this study, to minimize both the costs associated with track maintenance and the energy consumption for train operation, a numerical method that evaluates the optimal vertical stiffness of a fastener for concrete track is presented. A progress model of the track damage is established in order to calculate the concrete track maintenance cost according to the fastener stiffness. Also, the quantitative relationship between the progress of the track damage and the maintenance of the concrete track is derived. The wheel load is more exactly evaluated by using the advanced vehicle-track interaction model, which can precisely consider the behaviors of the track components. An optimal range for the stiffness of the fastener, a range that is applicable to the design of concrete track for domestic high speed lines, is proposed.

Railway Track Maintenance Scheduling using Artificial Bee Colony (Artificial Bee Colony 기법을 이용한 철도궤도 유지보수 일정계획 수립 연구)

  • Nam, Duk-Hee;Kim, Ki-Dong;Lee, Sung-Uk;Kim, Sung-Soo
    • Journal of the Korean Society for Railway
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    • v.13 no.6
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    • pp.601-607
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    • 2010
  • The objective of this paper is to propose a fast and easy Binary Artificial Bee Colony (BABC) heuristic algorithm to optimize NP-hard scheduling problem of railway track maintenance considering real conditions. The optimal or best solutions can be found using proposed BABC within very short or user specified computation time. We can greatly maximize the objective value using this proposed method in 30, 60, 100 and 200 work size railway track maintenance scheduling problems for experiment and analysis.

Mission Analysis Involving Hall Thruster for On-Orbit Servicing (궤도상 유지보수를 위한 홀추력기 임무해석)

  • Kwon, Kybeom
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.10
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    • pp.791-799
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    • 2020
  • Launched in October 2019, Northrop Grumman's MEV-1 was the world's first unmanned mission demonstrating the practical feasibility of on-orbit servicing. Although the concept of on-orbit servicing was proposed several decades ago, it has been developed to various mission concepts providing services such as orbit change, station keeping, propellant and equipment supply, upgrade, repair, on-orbit assembly and production, and space debris removal. The historical success of MEV-1 is expected to expand the market of on-orbit servicing for government agencies and commercial sectors worldwide. The on-orbit servicing essentially requires the utilization of a highly propellant efficient electric propulsion system due to the nature of the mission. In this study, the space mission analysis for a simple on-orbit mission involving Hall thruster is conducted, which is life extension mission for geostationary orbit satellites. In order to analyze the mission, design space exploration for various Hall thruster design variable combinations is performed. The values of design variables and operational parameters of Hall thruster suitable for the mission are proposed through design space analysis and optimization, and mission performance is derived. In addition, the direction of further improvement for the current on-orbit mission analysis process and space mission analysis involving Hall thruster is reviewed.

An Analytical Study on Running Safety and Ride Comfort in Case of Superimposition of Vertical and Transition Curves (종곡선과 완화곡선 경합시 차량주행안전성 및 승차감에 대한 해석적 연구)

  • Um, Ju-Hwan;Kim, Man-Cheol;Lee, Il-Wha;Goo, Byeong-Choon
    • Journal of the Korean Society for Railway
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    • v.15 no.2
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    • pp.172-178
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    • 2012
  • Superimposition of vertical and transition curves is not allowed for all types of tracks in Korean regulation of railway construction. However, this criterion has been established on the basis of difficulty of maintenance of the ballasted track. Comparing with the ballasted track, the concrete slab track has the advantage of maintenance and structural, which allows the superimposition of vertical and transition curves when it satisfies the criteria of running safety and riding comfort. In this study, running safety, ride comforts and track acting forces were analyzed and compared by numerical analysis using VAMPIRE program when the vertical and transition curves are superimposed for the ballasted track as well as the concrete slab track. From the analysis results, it was found that running safety, riding comforts and track acting forces in case of superimposition of vertical and transition curves for the both tracks meet all of the criteria. Therefore, although superimposition of vertical and transition curves for the ballasted track is not allowed because of a lot of maintenance works, it can be applied to the concrete slab track considering the advantage of maintenance and structural safety.

Analysis of Life Cycle Costs of Railway Track : A Case Study for Ballasted and Concrete Track for High-Speed Railway (철도 궤도의 수명주기비용 분석 : 고속철도 자갈궤도와 콘크리트궤도 사례 연구)

  • Jang, Seung Yup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.2
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    • pp.110-121
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    • 2016
  • In the decision-making, such as selection of structure, construction method, or time and scheme of maintenance, the evaluation of life-cycle cost(LCC) is of great importance. The maintenance cost occupy a large portion of the LCC of the railway track as well as the initial construction cost. Futhermore, the proportion of the maintenance cost is much higher in the ballasted track. Thus, the importance of the LCC evaluation is higher than in any other engineering structures. In this study, a LCC model that can consider various design parameters such as the type of track structure, annual traffic volume, axle load, train speed, and proportion of curve sections and engineering structures has been developed. Fundamental data for calculating costs also have been presented. Based on the model and data proposed, the trends in the variation of LCC according to the design parameters were examined and the most important design parameters in the LCC analysis of railway track were investigated. The results show that the proportion of renewal and operational costs is much higher in the ballasted track than in the concrete track, and the annual traffic volume and ballast taming period are most significant factors on the LCC of the ballasted track. On the contrary, it is revealed that the proportion of the initial construction costs in the concrete track is much higher, and the LCC of the concrete track is less sensitive to the traffic volume, train speed, and axle load.

A Study of Analysis Method for the Track geometry measuring data on High Speed Railway (고속철도 궤도검측자료 분석기법에 관한 연구)

  • Kang, Kee Dong
    • Journal of Korean Society of Steel Construction
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    • v.18 no.1
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    • pp.47-51
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    • 2006
  • Measuring the track geometry of a high-speed railway is the most important task in track construction and track maintenance work. Measuring accuracy is particularly sign the formulation of the maintenance plan and in the assessment of the work quality, and because it can set the train speed limit. To determine the track geometry of a high-speed railway, it is important to use KNR's track recording coach (EM-120). According to the result of the spectrum analysis, noise near the 1-m wave band was found on the track recording data. A new filter was thus applied to remove the noise from the track recording data. A similar result can be acquired when this method is used in real track geometry.