• Title, Summary, Keyword: Running Safety

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Dynamic Characteristics of the KTX on Wheel Conicity (차륜 답면형상에 따른 KTX의 동특성 검토)

  • Chang Jong-Ki;Lee Seung-Il;Choi Yeon-Sun
    • Proceedings of the KSR Conference
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    • pp.22-27
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    • 2003
  • The running safety of the rolling stock depends on the design characteristics and the contact condition between wheel and railway. In this study, the effect of the conicity of wheel tread on the running safety is analyzed. The modal analysis results in $0.5\~0.6Hz$ natural frequency with lateral modes. However, the frequency analysis for the running simulation shows the frequency components near 1Hz. The running simulation shows that the KTX with GV40 wheel has less lateral vibration than that of XP55 as the KTX goes higher speed.

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Analysis of derailment effect by vibration characteristics of rolling stock (철도차량의 진동특성에 의한 탈선영향 해석)

  • Lee K.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.355-360
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    • 2005
  • This paper describes how to measure the running safety using vibration accelerometers theoretically, and considers the effect of vibration parameters, such as amplitude and period, on the running safety by numerical analysis, which shows that the running safety are decreased as those parameters are increased.

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Analysis of Coupling Term Between Vertical Load and Lateral Load for Install Load Cell to Wheel-set (윤축에 로드셀을 설치하기 위한 하중간의 연성 해석)

  • Ham Y.S.;Seo J.W.;Kim S.R.;Hong J.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.41-42
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    • 2006
  • The important factor to evaluate the running safety of a railway vehicle would be the interaction force between wheel and rail(derailment coefficient), for which is one of important factors to check the running safety of a railway vehicle that may cause a tragic accident. In this paper, analysis of coupling term between vertical load and lateral load for install load cell to wheel-set. This result is going to be utilized in formality that verify running safety of tilting vehicles.

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A Study on the Running Safety of F26 Turnout and Vehicle Model

  • Kim, Sung Jong;Eom, Beom-Gyu;Lee, Hi Sung
    • International Journal of Railway
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    • v.5 no.4
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    • pp.156-162
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    • 2012
  • When a vehicle passes through turnout, it is required to minimize the changes of lateral force for running safety of vehicle. Therefore, it is necessary to analyze interaction between the vehicle and the turnout in order to estimate the lateral force and the derailment coefficient on the turnout. In this paper, analysis model of the vehicle and turnout are established and analysis is carried out when the vehicle passes through turnout in order to improve running safety of the vehicle on turnout. To verify the vehicle and turnout analysis model, the contact points between wheel and rail and the influence of changing cradle and tongue rail are also discussed.

A Study Vibration Characteristic of Railway Freight Car's End Beam for Taebaek Line (태백선을 주행하는 화차 엔드빔의 진동특성에 관한 연구)

  • 함영삼;문경호;홍재성;이동형;서정원
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.378-383
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    • 2004
  • Bogie is the connection device between carbody and wheel. It is the core part that exert a important effect on the passenger safety and running safety. Bogie largely consist of bogie frame, suspension, brake, wheel set. Static and Dynamic load have acted on it complexly. So when the bogie is designed, finite element method, static load test, fatigue test running test should be considered. Some bogie frame of high speed railway freight car have the problem. It's end beam was cracked. The crack of the end beam have a bad effect on brake system. ROTEM co. made an improved end beam and applied one set to freight car. this report showed the vibration characteristic which was compared conventional bogie to improved bogie for running safety.

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A Study on the Optimization of Suspension Characteristics for Improving Running Safety of Railway Vehicle (철도차량 주행안전성 향상을 위한 현가장치 최적화 연구)

  • Lee, Young-Yeob;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.909-914
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    • 2009
  • A suspension is the most prior apparatus to decide vehicle's running safety and ride comfort, also the suspension stiffness is the most important parameter for the designing of the vehicle. Providing the strong stiffness with the primary suspension in order to improve the running safety with high speed, but it causes a problem with a curve running performance of a railway vehicle. Therefore, many studies deal with the optimal value of suspension stiffness. In this paper, we aim to optimize the suspension system to improve running safety by varying stiffness values of railway vehicle suspension. We have proceeded an analysis by design variables which are position, length, width, stiffness and damping coefficients of primary and secondary suspension to optimize the suspension characteristics. As a result of the optimization, we verified that the derailment coefficients of inside and outside of wheel are decreased in comparison with initial model.

Analysis of Running Safety and Ride Comfort According to the Shape of Transition Curve (완화곡선형상별 차량주행안전성 및 승차감 분석)

  • Choi, Il-Yoon;Um, Ju-Hwan;Kim, Man-Cheol;Park, Chan-Kyoung
    • Journal of the Korean Society for Railway
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    • v.13 no.5
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    • pp.509-515
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    • 2010
  • Primary function of a transition curve is to accomplish gradual transition from the straight to circular curve, so that curvature changes from zero to a finite value. The transition curve enhances the running safety and ride comfort of the vehicle in curve. There are a couple of transition curve such as clothoid, cubic parabola and cosinusoidal curve, etc. In this study, running behaviors of cubic parabola and cosinusoidal curve were investigated and compared by numerical analysis result using VAMPIRE program. Ride comforts for an individual transition curve were evaluated for each transition curve and running behavior and safety were also evaluated to compare the capacity of transition curves.

Running Safety of High Speed Freight Bogie (고속주행용 화차 대차의 주행안전성)

  • 이승일;최연선
    • Proceedings of the KSR Conference
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    • pp.179-186
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    • 2001
  • As the freight traffic becomes heavier, the high speed of existing freight cars is essential instead of the construction of a new railway. The high speed can be achieved by the design modifications of the freight bogie. In this paper, an analytical model of freight bogie including the lateral force between rail and the flange of wheel is developed to decide the critical speed, which activates a hunting motion and tells the running safety of freight bogie. The dynamic responses of the analytical model were compared with an experimental data from a running test of a freight bogie and showed good agreements between them. The analytical model is used to find the design modifications of the freight bogie by parameter studies. The results show that the reduction of wheelset mass ratio and the increase of the axle distance of the freight bogie can increase the critical speed, but the primary lateral stiffness has little effects on the critical speed. And this also study shows that smaller wheel conicity deteriorates the running safety of the freight car, which means the overhauling of the wheel of freight bogie should be done regularly.

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Running Safety of High Speed Freight Bogie (고속주행용 화차대차의 주행안전성)

  • 이승일;최연선
    • Journal of the Korean Society for Railway
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    • v.4 no.3
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    • pp.116-122
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    • 2001
  • As freight traffic becomes heavier, the high speed of existing freight cars is essential, instead of the construction of a new railway. The high speed can be achieved by the modifications of freight bogie design. In this paper, an analytical model of freight bogie is developed to decide the critical speed. The dynamic responses of the analytical model are compared with the experimental data from a running test of freight bogie and showed good agreements between them. The analytical model is used to find the design of freight bogie. The parameter studies show that the reduction of wheelset mass ratio and the increase of the axle distance of freight bogie can increase the critical speed, but the primary lateral stiffness has little effects on the critical speed. And this study also shows that smaller wheel conicity deteriorates the running safety of freight car, which means that the overhauling of the wheel of freight bogie should be done regularly.

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Dynamic analysis of metro vehicle traveling on a high-pier viaduct under crosswind in Chongqing

  • Zhang, Yunfei;Li, Jun;Chen, Zhaowei;Xu, Xiangyang
    • Wind and Structures
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    • v.29 no.5
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    • pp.299-312
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    • 2019
  • Due to the rugged terrain, metro lines in mountain city across numerous wide rivers and deep valleys, resulting in instability of high-pier bridge and insecurity of metro train under crosswind. Compared with the conditions of no-wind, crosswind triggers severer vibration of the dynamic system; compared with the short-pier viaduct, the high-pier viaduct has worse stability under crosswind. For these reasons, the running safety of the metro vehicle traveling on a high-pier viaduct under crosswind is analyzed to ensure the safe operation in metro lines in mountain cities. In this paper, a dynamic model of the metro vehicle-track-bridge system under crosswind is established, in which crosswind loads model considering the condition of wind zone are built. After that, the evaluation indices and the calculation parameters have been selected, moreover, the basic characteristics of the dynamic system with high-pier under crosswind are analyzed. On this basis, the response varies with vehicle speed and wind speed are calculated, then the corresponding safety zone is determined. The results indicate that, crosswind triggers drastic vibration to the metro vehicle and high-pier viaduct, which in turn causes running instability of the vehicle. The corresponding safety zone for metro vehicle traveling on the high-pier is proposed, and the metro traffic on the high-pier bridge under crosswind should not exceed the corresponding limited vehicle speed to ensure the running safety.