• 제목, 요약, 키워드: Rail Stability

검색결과 218건 처리시간 0.039초

장척레일 축력 비교 연구 (A comparison study for the Axial forte of Longer Rail)

  • 민경주;이성욱;박대희
    • 한국철도학회:학술대회논문집
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    • pp.516-528
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    • 2009
  • Form the application of long rail system the non-ballast steel plate bridges, fatigue strength increase and rail noise reduction can be expected. This is mainly form the reduction of the rail impact at the rail joint locations which already made to behave together from welds. In the high speed rail, application of long rail system is essential because without long rail system, the required serviceability level can not be achieved. But even with this long rail systems, the thermal expansion from the girder can not be absorbed in the normal bearing systems, and these expansion cause between girder and rail. Also unexpected rail buckling and fracture through rail thermal tension may happen. It was found through numerical analysis and field measurement that these problems can be avoided by semi-fixed bearing system. In this study, the benefits of non-ballast plate bridge through long rail system, especially at the point of girder stability, girder stiffness increase and bearing maintenance will be reviewed.

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무도상 판형교 레일 장대화에 따른 궤도 유지관리 비교연구 (A comparison study for the track maintenance system for the non-ballast steel plate bridge)

  • 남보현;장태철;우용근;민경주
    • 한국철도학회:학술대회논문집
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    • pp.401-410
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    • 2007
  • Form the application of long rail system the non-ballast steel plate bridges, fatigue strength increase and rail noise reduction can be expected. This is mainly form the reduction of the rail impact at the rail joint locations which already made to behave together from welds. In the high speed rail, application of long rail system is essential because without long rail system, the required serviceability level can not be achieved. But even with this long rail systems, the thermal expansion from the girder can not be absorbed in the normal bearing systems, and these expansion cause between girder and rail. Also unexpected rail buckling and fracture through rail thermal tension may happen. It was found through numerical analysis and field measurement that these problems can be avoided by semi-fixed bearing system. In this study, the benefits of non-ballast plate bridge through long rail system, especially at the point of girder stability, girder stiffness increase and bearing maintenance will be reviewed.

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국내 기후환경에서의 레일온도 (Rail Temperature under the Domestic Climate Condition)

  • 이우철;이진옥;최진유;임남형
    • 한국철도학회:학술대회논문집
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    • pp.546-547
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    • 2009
  • To ensure stability of continuous welded rail in extremely hot weather is important to the railway industry's goal of operational safety and maintenance. Rail temperature has direct influence on track buckling. According to climate condition, distribution of rail temperature is different. In this study, the fluctuation of rail temperature were investigated under the domestic climate condition (air temperature, humidity, insolation, etc)

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장대레일 재설정 방법 개선 연구 (A study on the refined resetting for the continuous weleded rail)

  • 김우진;정찬묵;민경주
    • 한국철도학회:학술대회논문집
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    • pp.386-394
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    • 2007
  • Due to the transportability problems, long rail shall be from base rail unit, which is normally 100m for regular rail and 300m for high speed rail. After these rail units are transported from the fabricator to the site, the field weld would be performed.axial stresses in the long rail is mainly from the temperature differences at various locations the long rail. Also the gaps between each welds cause secondary axial stresses in the rail. In addition to these, re-welds the fractured rails, rail buckling, irregular rail vibration, rail twist also result innonuniform axial stresses in the rail. To obtain the rail buckling stability, the rail stresses shall be released due to the resetting of CWR. Traditionally two resetting of CWR methods have been applied, the one is rail heater and the other is rail tenser. these methods, the latter has been recommended because it has less limitation in the rail length and it is easier to minimized the force differences. But even in this method, the calculation is cumbersome and is not easy to find out the rail stress distribution itself.refined methodsxial stress resetting in the long rail is studied and this study be easily applied in the real construction. From this approach, more rational rail maintenance system can be expected.

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고무차륜 AGT 경량전철 차량용 제 3 궤조 집전장치의 이선특성 (Electrical interruption characteristics of 3rd rail type power collector for rubber-tired AGT light rail vehicle)

  • 박성혁;김연수;윤성철;전현규
    • 한국정밀공학회:학술대회논문집
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    • pp.556-559
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    • 2004
  • This study was aimed to verify the acceptable contact force between power collector and 3rd rail type conductor rail for the Korean standardized rubber-tired AGT light rail vehicle. The power collector was designed and manufactured to satisfy the Korean standardized Specifications of the rubber-tired AGT light rail vehicle. Based on the dynamic behavior, contact force variation and interruption in the worst installation tolerance of the conductor rail, its initial contact force was set up. With rotary disk type equivalent test apparatus with circular conductor rail, the interruptions were measured. As the results, acceptable contact force was proposed to ensure power collection stability.

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Geological feasibility and slope stability analysis under GIS environment for rail route alignment

  • Jain, Kamal;Kumar, Anand
    • 대한원격탐사학회:학술대회논문집
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    • pp.186-188
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    • 2003
  • Rail Route Alignment in hilly terrain is a difficult task to implement as several natural constraints poses threat to the safety and stability of the alignment. The conventional methods followed to find out the final location survey or the feasibility analysis for alignment is time taking consuming. Some times, due to inaccessibility of the terrain it becomes impossible to carry out such works. The construction works in hilly terrain, which are associated with the proposed alignment, are not same as carried out in plane areas due to a vast contrast between the two areas. Different geological structures such as faults, thrusts, synclines and anticlines are a big problem to carry out normal construction practices. Thus for a safe and stable railway route in the unstable hilly areas, it is required to carry out the feasibility analysis of the proposed alignment to assist the policy makers for a successful implementation of the alignment. In the present work Remote Sensing and GIS has been successfully used to carry out geological feasibility and slope stability analysis for rail route alignment work.

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혹서기 좌굴사고 방지를 위한 합리적인 열차속도 규제에 관한 연구 (A Study on the Train Speed Restriction to Prevent Track Buckling in the Hot Summer)

  • 배현웅;최진유;김명수;이진옥;임남형
    • 한국철도학회:학술대회논문집
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    • pp.2891-2894
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    • 2011
  • Recently, the rise of the rail temperature is accelerating further due to the global warming, and the track stability(buckling) problem result from the axial force in the continuous welded rail(CWR) have become the most important issue. This track stability threatens the security of running trains in the hot summer. In order to prevent the track buckling in the hot summer and ensure the safety of the running train, as a part of the safety control plan for KORAIL high-speed railway, the train speed restriction according to the rail temperature was introduced in 2004. However, the conceptual and theoretical background of train-speed restriction is uncertain. In this paper, the theoretical study about the reasonable train-speed restriction is performed. For this purpose, the risk-based probabilistic stability evaluation of the track buckling is applied.

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고속철도 차량의 시$\cdot$제동 하중에 대한 교량상 장대레일의 주행안전성 평가 (Stability of CWR track on the High-Speed Railway Bridges considering Braking and Accelerating Forces)

  • 진원종;김병석;곽종원;강재윤;최은석
    • 한국철도학회:학술대회논문집
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    • pp.769-774
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    • 2004
  • In this paper, the main factors affect on the longitudinal rail force are discussed. Considering rail-bridge interaction, analytical and experimental evaluation of track behavior has been achieved. It is concluded that the horizontal ballast strength, the expansion length of the bridge span, and the stiffness of the bridge sub-structure are the significant parameters affecting the stability of the continuous welded rail (CWR) track. And, it is suggested that the ballast resistance forces should be maintained to ensure the track stability during the service.

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상시 계측결과를 이용한 경부고속철도 교량의 동적거동 분석 (A analysis on dyanmic movements of Bridge status using High Rail monitoring systems)

  • 정재민;한상철;최일윤;이준석;서형렬
    • 한국철도학회:학술대회논문집
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    • pp.934-939
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    • 2004
  • The Korea high-speed rail, based on the French design. It also implements new concept to increase the strength of bridge deck by adding an impact factor (dynamic intensity factor) in static load. In order to assure the dynamic stability, SYSTRA and Jeseph Penzien, a professor in CEC (the US) conducted a dynamic stability review on design phase. Analyzing the review results, they developed design criteria for dynamic behavior. This study deal with operating PSC box GIRDER equipped with measurement equipment or measured data of Seoul $\∼$ Taejeon, P.S.C BOX GIRDER bridge and steel comsition bridge equipped with measurement equipment based on structual knowledge about configuration of measuring sensor, response analysis of structure when train runs was performed by using measured data of PSC box girder to directly compare with design criteria. moreover, the dynamic stability with comparison of high-speed rail construction criteria was reviewed and analyzed based on historical records.

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휠-레일 2점 접촉 해석 알고리즘 개발에 관한 연구 (A development of the 2-point Whee-Rail Contact Algorithm)

  • 정기범;박태원;박재흥;정남호
    • 한국철도학회:학술대회논문집
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    • pp.1888-1893
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    • 2011
  • Considering the dynamic performance and stability of railroad vehicles has begun to grab the attention because of developing the high speed train recently. A development based on an analysis of dynamics and verification has to be required to study the stability of vehicle performance. Several ways of analysis were using the look-up table to apply the wheel-rail contact characteristics quickly, whereas there is a constraint of the wheelset lateral displacement. In this study, an development of searching the wheel-rail contact position has been provided. The 2-point contact between wheel and rail during the driving condition can be calculated by numerical analysis. Moreover, a reliability is verified by comparing the result with a commercial program.

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