• Title, Summary, Keyword: 압상력

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Evaluation of Uplift Forces Acting on Fastening Systems at the Bridge Deck End Considering Nonlinear Behaviors of the Fastening Systems (체결장치 비선형 거동을 고려한 교량 단부에서의 체결장치 압상력 평가)

  • Yang, Sin Chu;Kim, Hak Hyung;Kong, Jung Sik
    • Journal of the Korean Society for Railway
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    • v.20 no.4
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    • pp.521-528
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    • 2017
  • In this study, vertical loading tests were conducted to investigate the nonlinear behaviors of the fastening systems that have generally been used in the concrete track of domestic railway lines. Nonlinear load-displacement curve models were derived based on the test results. The uplift forces generated in the fastening systems were evaluated by applying the derived nonlinear models as well as the existing linear models. The influence of the factors on the maximum uplift force of the fastening system was analyzed through a parameter study on the distance between neighboring sleepers, the horizontal distance between the center of the bearing and the nearest fastening system from the deck end, and the height of the bridge girder. From the evaluation results it is known that, for economical track and bridge design, due to deck end deformation, it is necessary to consider the nonlinear behavior of the fastening system in the calculation of the uplift force of the fastening systems.

A new design research on Pantograph Panhead, having a Hole characteristics (구멍 효과를 이용한 Pantograph Panhead 새로운 설계 연구)

  • Kim, Jae-In;Choe, Dae-Hyeon;Kim, Jong-Am
    • Proceeding of EDISON Challenge
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    • pp.579-584
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    • 2014
  • 고속 열차의 속도가 점점 빨라짐에 따라 고속 열차 주행 시 발생하는 여러 공력적인 문제가 대두되고 있다. 그 중 고속 열차와 전력선을 이어주는 판토그래프에서의 소음 발생과 압상력 불안정 문제가 중요시 되어왔고 이에 대한 여러 선행연구가 진행되고 있다. 지금까지의 선행 연구는 원형, 사각형, 에어포일과 같이 기본적인 형상을 이용한 판토그래프 팬헤드의 최적 단면 형상을 찾는 데에 초점을 맞추고 있다. 본 연구는 이러한 주류의 접근 방식에서 벗어나 팬헤드에 구멍을 추가하여 그 효과를 보는 다양한 시도를 해보았고 구멍이 소음 발생과 압상력 불안정에 미치는 영향에 대하여 연구하였다.

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Analysis of Change of Contact Force in the Pantograph Pan Head of Next Generation High Speed Train (차세대 고속전철 팬터그래프 팬 헤드의 압상력 변화 해석)

  • Kang, Hyungmin;Kwon, Hyeok-bin
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.1
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    • pp.35-40
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    • 2017
  • In order to investigate the change of contact force of pantograph pan head due to the change of aerodynamic force, three dimensional flow around the pan head were calculated. For this, the aerodynamic modeling of pan head of CX pantograph was performed and the standard deviation of the contact force of the simulation results were compared with those of the experimental results of wind tunnel tests. From the comparison, it was confirmed that the current grid system and the numerical methodologies can be utilized to calculate the aerodynamic characteristics of the pantograph pan head. By using these grid system and the methodologies, the standard deviations of the contact force of pan head were calculated with velocities as 200, 250, 300, 350, and 400 km/h. The maximum standard deviation of the aerodynamic contact force of pan head was 92 N at 400 km/h and statistical minimum contact force was more than 0 N. Therefore, it was confirmed that and the pan head of CX pantograph was statistically contacted with the catenary system with the train speed of 350 km/h though the aerodynamic contact force was changed.

A Real-scale Wind Tunnel Testing on a Pantograph for High-speed Train to Assess the Aerodynamic Characteristics (고속철도차량용 팬터그래프의 공력특성 평가를 위한 실모형 풍동시험)

  • Kwon, Hyeok-Bin;Cho, Young-Hyeon;Lee, Ki-Won;Kim, Ki-Nam
    • Journal of the Korean Society for Railway
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    • v.12 no.5
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    • pp.732-737
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    • 2009
  • Wind tunnel testing on the real-scale pantograph for high-speed train has been conducted to investigate the aerodynamic characteristic of the pantograph at high-speed. The mid-scale subsonic wind tunnel of Korea Airforce Acamedy with 3.5m width, 2.45m height, and 8.8m length test section has been employed. The test model has been supported above 50cm height from the bottom of test section using vertical strut to eliminate the boundary layer generated from the bottom of the test section. The height of the pantograph has been varied in three cases, in both of the normal running and reverse running modes. The resultant lift forces of the pantograph to catenary system in all the cases have been measured and the relation between the test conditions and the lift forces have been extensively analyzed.

The Design and Manufacture of Pantograph for Korean High Speed Train (한국형 고속전철용 판토그라프의 설계 및 제작)

  • 김휘준;박수홍;정경렬;배정찬
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1223-1228
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    • 2001
  • We have been developing the pantograph for Korean High Speed Train for the last five years. To fulfil the following requirements at designed speed of 350km/h : 1) contact loss less than 1 %, 2) aerodynamic noise less than 91dB, 3) average uplift force less than 200N, the pantograph has been modified two times since the first prototype pantograph was manufactured, By means of the following up characteristic test, low speed wind tunnel test, and high speed wind tunnel test for the prototype pantographs, we found that the aerodynamic uplift force did not exceed l60N at speed up to 350km/h and the aerodynamic noise was less than 88dB, that the following up characteristics of the prototype pantograph was excellent.

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Wave Propagation Characteristics along a Catenary with Arbitrary Boundary Conditions (임의의 경계조건을 갖는 가선계의 파동 현상에 대한 고찰)

  • 김양한;박연규;김시문;노현석
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.11
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    • pp.2059-2071
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    • 1992
  • The characteristics of wave propagation along a catenary in rail electrification system depend on the boundary impedance, characteristic impedance of catenary, and the contact force of pantograph moving along the catenary. In this study, the wave propagation along catenary is studied with arbitrary boundary conditions and characteristic impedance of catenary. The reflection and transmission of waves through the boundaries of catenary and the propagation of waves along the catenary are found to be dependent on the wave length.

The Parameter Study of Serviceability Review of End Track on Railway Bridge installed Concrete Slab Track (콘크리트궤도 부설 교량의 단부 사용성 검토를 위한 매개변수 연구)

  • Sung, Deok-Yong;Kim, Young-Ha;Park, Yong-Gul;Kim, Sung-Il
    • Proceedings of the KSR Conference
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    • pp.117-124
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    • 2008
  • Construction of concrete slab track is trending to increase gradually in national and international for reduction in track maintenance cost and secure of ride comfort. However, in case of railway bridge installed concrete slab track, the serviceability review of end deck should be performed for reducing the maintenance cost of track. The serviceability review of track contains that the compression force which is occurred on fastener of end bridge should be smaller than the compression force causing the deformation limit of elastic pad and the uplift force which is occurred on fastener of end abutment should be smaller than initial fastening force. Therefore, this study calculated the deflection and end rotation of the railway bridge according to the span length and stiffness of railway bridge and estimated the compression force and uplift force which are occurred on the track of end bridge using the finite element method. This study indicated the several diagrams that are contained the correlation between the behaviour of the track and the behaviour of the railway bridge. As a result, to reduce the end rotation of the railway bridge is very efficient to increase the height of railway deck.

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The Aerodynamic Analysis of Pantograph of the Next Generation High Speed Train (차세대 고속철도 판토그래프의 공력특성 해석)

  • Kang, H.M.;Kim, C.W.;Cho, T.H.;Yoon, S.H.;Kwon, H.B.;Park, C.S.
    • 한국전산유체공학회:학술대회논문집
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    • pp.362-367
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    • 2011
  • The aerodynamic performance of the pantograph of the next generation high sped train is analyzed. The calculation of the flow around pantograph is carried cut by FLUENT; by the steady state flow calculation with ${\kappa}-{\omega}$ SST turbulence model, the lift force of the pantograph is computed. For the verification of the numerical schemes am grid systems, flow calculations are performed with the pantograph shape which was used at the experiments performed at Railway Technical Research Institute (RTRI) in Japan. Then, the difference of lift force between numerical am experimental results is about 10%. Therefore, selected numerical schemes and the current grid system is adequate for the analysis am prediction of the aerodynamic performance of panthograph system. Based on these numerical schemes am grid system, the flow around pantograph of the next generation high sped train is calculated and the lift force of the pantograph is predicted; the lift force of the pantograph is about 146N.

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A Study on the Evaluation of Dynamic Characteristics of the Pantograph for the Korean High-Speed Train through 350km/h Trial Running Test (350km/h 본선 주행시험을 통한 한국형 고속열차 판토그라프의 접촉력 특성 평가 연구)

  • Lee Hi-Sung;Mok Jin-Yong
    • Journal of the Korean Society for Railway
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    • v.8 no.4
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    • pp.342-347
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    • 2005
  • The Korean High-Speed Train(HSR 350x) had been developed by through 'G7-R&D project' in 1996-2002, and has been testing and evaluating it's reliability on the high-speed line until now. A number of core equipments designed and developed by using domestic technologies were boarded on the HSR 350x. In order to verify the performance of HSR 350x and core equipments such as traction system, brake system and pantograph, sophisticated testing and evaluating procedures should be considered and applied. In this paper, the tested and analysed results about the dynamic characteristics of HSR 350x pantograph are introduced in a view point of the mean contact force and it's variation trend, criterion of current collection, and up-lifting of contact wire when the MSR 350x running up to 350 km/h. Through the test and evaluation, we verified that HSR 350x pantograph had an excellent current collection performance and good dynamic characteristics as it had been designed.

INVESTIGATION FOR THE AERODYNAMIC CHARACTERISTICS OF HIGH SPEED TRAIN PANTOGRAPH WITH COVER (커버 형상을 고려한 고속전철 팬터그래프 공력특성의 수치해석적 연구)

  • Kang, H.M.;Kim, C.W.;Cho, T.H.;Kim, D.H.;Yoon, S.H.;Kwon, H.B.
    • Journal of computational fluids engineering
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    • v.17 no.3
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    • pp.18-24
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    • 2012
  • The aerodynamic performance of the pantograph on a high speed train was compared for different pantograph covers which are designed to block the aero-acoustic noise from the pantograph. For the study, two types of cover are designed: wedge and cone types. The lift force of pantograph with cover was compared with the force of pantograph only. The comparison clarified that the cone type cover increases the sideslip angle of the flow and decreases the lift force considerably. However, the wedge type cover changes the flow direction upward and increases the lift force of the pan head. This increment of lift force compensates the decrement of lift force caused by the blocking of the flow into the pantograph lower frame due to cover. Therefore, in case of the wedge type cover, the overall lift force changes slightly compared with the cone type cover.