• 제목, 요약, 키워드: Rail Stability

검색결과 218건 처리시간 0.041초

고무차륜 AGT 경량전철 차량용 제 3 궤조 집전장치의 성능시험 (Performance Test of $3^{rd}$ rail type power collector for rubber-tired AGT light rail vehicle)

  • 박성혁;김연수;김길동
    • 한국정밀공학회:학술대회논문집
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    • pp.1341-1344
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    • 2005
  • 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. At the test track for the Korean standardized rubber-tired AGT light rail vehicle, interruptions, stresses, vibrations, and contact force variations were measured. As the results, initial contact force was verified to ensure power collection stability.

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강우시 성토사면의 열차운전규제기준 (Rail Transport Operation Control for Railway Embankment under rainfall)

  • 김현기;신민호;최찬용
    • 한국지반공학회:학술대회논문집
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    • pp.225-232
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    • 2009
  • Infiltration of rainfall causes railway slopes to be unstable and may result in failure. Basic relationship between the rainfall and stability of railway embankment is defined to analyze its stability by rainfall. An experimental study for defining of infiltration rate of rainfall into slope is conducted in the lab. The results of Rainfall infiltration show that rainfall infiltration is not equal to infiltration as like reservoir because rate of rainfall infiltration is controlled by slope angle. Based on these results, boundary condition of rainfall is altered and various numerical analysis are performed. The variation of shear strength, the degree of saturation and pore-water pressure for railway slope during rainfall can be predicted and the safety factor of railway slope can be expressed as the function of rainfall amount, namely rainfall index. And suggested rainfall index is compared with the rail transport operation control which is used in KORAIL. It is judged that this rainfall index can be a good tool for the rail-transport operation control.

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미국철도협회의 차륜/레일 접촉상태 차상 자동검측 기술 개발 현황 (AAR's R&D Status on An Automated Measurement System for Wheel/Rail Contact Condition Inspection)

  • 정흥채
    • 한국철도학회:학술대회논문집
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    • pp.115-118
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    • 2007
  • The geometry of wheel and rail profiles is the primary contributor to wheel and rail interaction. These profiles interact to influence truck steering, vehicle lateral stability, wheel/rail wear and surface damage. Maintaining good control of the profiles is one of the keys to ensuring preferred wheel and rail interaction. Transportation Technology Center, Inc., Pueblo, Colorado, is developing an automated measurement system for wheel/rail contact condition inspections supported by AAR(Association of American Railroads). The system uses a modified version of $WRTOL^{TM}$ (Wheel/Rail Tolerances)--software that performs extensive analysis of wheel and rail contact conditions

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고속철도교 신축부의 진동 및 신축의 효율적인 저감 방안 (Effective Methods Reducing Joint Vibration and Elongation in High speed Rail Bridge)

  • 민경주;강태구;임남형
    • 한국철도학회:학술대회논문집
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    • pp.800-806
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    • 2011
  • Thermal expansion which occurs at the high speed rail joint is proportional to the free length from the point of fixity. This thermal expansion behaves similar to free expansion because the girder longitudinal stiffness is much larger than longitudinal resistance of rail pads. But the longitudinal displacement in the long rail is nominal because the longitudinal support condition of the girder is normally MFM(movable-fix-movable) system. Due to these girder expansion characteristics, there is longitudinal relative displacement at the rail pad and rail fastener spring which connects rail and girder. If the relative displacement between rail and girder is beyond the elastic limit for the rail pad, rail fastener system shall be applied using sliding fastener to prevent rail pad damage and fastener separation resulting from slip. On the other hand, train vertical vibration and tilting can occur due to the lack of fastener vertical force if the sliding fastener is applied at the girder joint. In the high speed rail bridge, vibration can occur due to the spring stiffness of the elastomeric bearing, also both vertical downward and upward displacement can occur. The elastomeric bearing vertical movement can cause rail displacement and finally the stability of the ballast is reduced because the gravel movement is induced.

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철도 레일빔 설계법에 대한 연구 (Design of the Railbeam Lengths at the Roadbed)

  • 정혁상
    • 한국지반환경공학회 논문집
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    • v.17 no.1
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    • pp.21-28
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    • 2016
  • 본 논문은 레일빔의 길이 산정에 관해서 지반공학적 측면에서 다룬 내용을 담고 있다. 레일빔은 철도횡단공사에서 가설기간 중에 부등침하 방지 목적으로 레일의 내측과 외측에 설치하는 보강레일을 말한다. 이러한 레일빔은 최근 철도를 횡단하는 지하 구조물의 시공이 증가해서 기존 철도 시설물의 안정에 대응하고자 많이 설치하고 있다. 그러나 레일빔 길이 설계에 관한 기준이 없어 설계에 어려움이 있을 뿐만 아니라 레일빔 길이 부족으로 탈선사고까지 이어지는 경우가 발생하고 있다. 따라서 본 연구에서는 레일빔 길이 산정 방식에 대하여 토사지반과 암반지반으로 분류하여 Flow chart를 제시하였으며 레일 조합 및 위치에 대한 Case study를 실시하여 효과적인 레일의 조합과 위치에 확보할 수 있었다.

경부고속철도 교량상 장대레일의 온도응력 계측 실험 (Investigation of Thermal Stress of Continuous Welded Rail on High Speed Railway Bridge)

  • 강재윤;최은석;진원종;이정우;곽종원;김병석
    • 한국철도학회:학술대회논문집
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    • pp.458-461
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    • 2007
  • Recently, the continuous welded rail(CWR) track has been used for less maintenance of the High-speed railway tracks. In case of CWR track, track buckling has always been an unpredictable event under the high compressive stress in rail. The behavior and stress state of CWR track is manily influenced by its thermal variations, and it is important to understand seasonal variations of rail temperature and stress to predict the track stability. This paper describes the in-site measurement for the rail temperature and rail stress, and the correlation between the rail temperature and stress was examined.

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철도의 곡선반경 및 캔트에 따른 노반의 침하 및 지지력 산정 (Estimation of the Roadbed Settlement and Bearing Capacity According to Radius of Curve and Cant in Railroad)

  • 전상수;엄기영;김재민
    • 한국방재학회 논문집
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    • v.7 no.1
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    • pp.29-38
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    • 2007
  • 틸팅차량의 안정성 확보를 위해 궤도부담력과 주행안정성 검토가 이루어졌으며, 틸팅차량이 궤도부담력과 주행안정성 검토에 의해 산정된 허용속도로 운행될 경우 레일이음매 하부 노반침하에 대한 연구가 수행되었다. 열차 주행시 레일이음매와 장대레일에 작용하는 충격량이 다르기 때문에 장대레일 하부 노반에 대한 안정성 검토가 추가적으로 필요하다. 본 연구에서는 장대레일에 대하여 노반의 침하량 및 지지력을 수치해석을 통해 검토하고 허용침하량 및 허용지지력과 비교하여 노반의 안정성을 검토하였으며 레일이음매와 장대레일 하부 노반의 침하량 및 지지력을 비교 분석하였다. 그 결과, 장대레일 및 레일이음부 하부 노반의 침하량은 허용침하량의 71.2% 및 88.8%, 응력은 허용지지력의 10.4% 및 12.1%로 나타났다.

ADAMS/Rail을 이용한 철도 차량 동특성 해석 (Dynamic analysis of the rail vehicle system with ADAMS/Rail)

  • 조연호;이강운;박길배;양희주;박현기
    • 한국철도학회:학술대회논문집
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    • pp.679-685
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    • 2003
  • Rotem has been using VAMPIRE for simulation and verification of the railway vehicle design. To improve the capability and accuracy of the analysis ability, ADAMS/Rail has been chosen as the next generation analysis tool. The dynamic performance of the railway vehicle, which is designed and manufactured by Rotem, is analyzed and simulated using ADAMS/Rail. The critical speed for linear and non-linear stability on tangent track, curving performance on various curved tractk, ride quality, derailment coefficient and the eigen values are calculated. In this paper, the results from ABAMS/Rail are compared with VAMPIRE's results.

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매개변수해석을 통한 고속전철교량상 장대레일궤도 안전성 검토 (Parametric Study on the Safety of CWR Track over High-Speed Railway Bridges)

  • 강재윤;김병석;김영진;박성용;조정래;최은석;진원종
    • 한국철도학회논문집
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    • v.5 no.1
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    • pp.1-9
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    • 2002
  • Where the track is continuously welded over the bridge, the longitudinal forces will be distributed interactively between the track and the sub-structure by the rail-bridge interaction mechanism. The ratio between the longitudinal forces transmitted in each elements depends on the magnitude of the ballast resistance and the stiffness of the sub-structures. In this paper, the main factors affect on the longitudinal rail force are discussed and the parametric study for the behavior of CWR(Continuous Welded Rail) track was executed. It is concluded that the horizontal ballast resistance and the stiffness of the bridge sub-structure are the significant parameters affecting the stability of the continuous welded rail track.