• Title, Summary, Keyword: Running Safety

Search Result 573, Processing Time 0.037 seconds

A Running Safety Assessment for Curved Section for a Railway Vehicle (철도차량의 곡선 구간별 주행안전성 평가)

  • Lee, Seung-Il;Lee, Hi-Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.12
    • /
    • pp.1301-1309
    • /
    • 2008
  • The curved portion fur each section running safety evaluation interpretation according to the track condition for improving the curved portion passage rate of a vehicle by using the multibody analysis model of the Saemaeul train was carried out. As a result, The excess of cant reaches the bad effect to the running safety in case the radius of curvature is small. In case the radius of curvature was large, we could confirm that the deficiency of cant reached the bad effect to the running safety. In the curved portion, the circular curve section most badly showed the running safety. The deficiency of curve length reaches the bad to the running safety. In the curved portion, the circular curve section most badly showed the running safety. Therefore the track condition(cant, transition curve length, etc) can reach the bad effect to the running safety of a vehicle, the exact design is required.

Evaluation of Train Running Safety for Direct Fixation Concrete Track on Light Rapid Transit (경전철 직결식 콘크리트 궤도구조의 열차주행안전성 평가)

  • Choi, Jung-Youl;Kim, Jun-Hyung;Chung, Jee-Seung;Lee, Sun-Gil
    • Journal of the Korean Society of Safety
    • /
    • v.32 no.5
    • /
    • pp.41-46
    • /
    • 2017
  • The coefficient of derailment and the rate of wheel load reduction were used as the index of train running safety that was directly affected the train derailment safety. In aspects of track, the train running safety depends on the complex interaction between wheel and rail, and the track-vehicle conditions (i.e., the curvature, cant, track system, vehicle speed and the operation conditions, etc). In this study, the relationship between the train running safety and the track curvature and vehicle speed for direct fixation concrete tracks currently employed in Korean light rapid transit was assessed by performing field tests using actual vehicles running along the service lines. The measured dynamic wheel load, lateral wheel load and lateral displacement of rail head were measured for same train running on four tested tracks under real conditions, which included curved and tangent tracks placed on the tunnel and bridge, thus increasing the train speed by approximately maximum design speed of each test site. Therefore, the measured dynamic track response was applied to the running safety analysis in order to evaluate the coefficient of derailment, the rate of wheel load reduction and the track gauge widening at each test site, and compare with the corresponding Korean train running safety standard. As the results, the lateral track response of direct fixation concrete track appeared to increase with the decreased track curvature; therefore, it was inferred that the track curvature directly affected the train running safety.

Running Safety Analysis of Railway Vehicle passing through Curve depending on Rail Inclination Change (레일 경좌 변화에 따른 곡선부 통과열차의 주행안전성 해석)

  • Kim, Moon Ki;Eom, Beom Gyu;Lee, Hi Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.23 no.3
    • /
    • pp.199-208
    • /
    • 2013
  • So far today, there is a speed limit by the radius of curve based on operation regulation in domestic railway, however a study for the maximum running speed at the curved section without any derailment would be necessary. The two major factors related to the running safety of railway vehicle are classified as the railway vehicle condition and the track condition. In terms of the rail inclination among many other factors, the determination of rail inclination within the possible limit is necessary for the geometrical structure of the optimum track. The disregard of the geometrical parameter related to the rail inclination may cause a serious problem to the running safety of railway vehicle. This study is focusing on the analyzing of running safety regard to the change of rail inclination among the many other parameters to improve derailment safety, so that there is an affection analysis of the running safety regard to the change of rail inclination in the ideal and geometric track condition. Also There is an affection analysis of the running safety regard to the simultaneous change of rail inclination and the running speed at the curved section. According to analysis results of running safety, In case that the left and right rail inclination are 1/40, the running safety of this condition defined than other conditions. Also, the rail inclination of conventional lines is 1/40, Therefore, the railway vehicle passing through curve is safe when the railway vehicle runs in conventional lines.

Influence of Semi-active Suspension on Running Safety of Vehicles

  • Liu, Hong-You;Yu, Da-Lian
    • International Journal of Railway
    • /
    • v.3 no.2
    • /
    • pp.68-72
    • /
    • 2010
  • Railway vehicles equipped with semi-active suspension system can improve the ride quality of car bodies. Semi-active suspension system is usually applied onto high speed train, and therefore higher running safety requirement is desirable. The influence of semi-active suspension system on safety of vehicles running on straight line and curve line is studied, and the influences of sky hook damping coefficient and system time-delay on operational safety of cars fitted with semiactive suspension system is analyzed. The results show that in vehicles equipped with semi-active suspension system, while the vibration of car body is decreased, the running safety of cars is not affected to any significant degree. As a result, the ride quality is much improved with negligible deterioration of the running safety of cars.

  • PDF

Influence of Semi-Active Suspension on Running Safety of Vehicles

  • Liu, Hong-You;Yu, Da-Lian
    • International Journal of Railway
    • /
    • v.2 no.4
    • /
    • pp.147-151
    • /
    • 2009
  • Railway vehicles equipped with semi-active suspension system can improve the ride quality of car bodies. Semi-active suspension system is usually applied onto high speed train, and therefore higher running safety requirement is proposed. The influence of semi-active suspension system on safety of vehicles running on straight line and curve line is studied, and the influences of sky hook damping coefficient and system time-delay on operation safety of cars fitted with semiactive suspension system is analyzed. The results show that the vehicles equipped with semi-active suspension system, not only the vibration of car body is decreased, it can also give little influence on running safety of cars, as a result, it will not endanger the running safety of cars.

  • PDF

Estimation of Curving Performance and Running Safety of Gwangju Electric Multiple Unit for City Subway (광주도시철도 전동차의 곡선추종성 및 주행안전성 평가)

  • Ham, Young-Sam;Oh, Taek-Yul
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.745-750
    • /
    • 2004
  • For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 80km/h for estimating the curving performance and running safety of Gwangju EMU. As the test results, could confirm the curving performance and running safety of Gwangju EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

  • PDF

Verification of Running Safety Evaluation Method for High-speed Railway (고속열차 주행안전성 평가법에 대한 검증 연구)

  • Ryu, Sang-Hyun;Kim, Sang-Soo;Kim, Dae-Sik;Kim, Sang-Young;Hong, June-Hee;Lee, Ki-Jun
    • Journal of The Korean Society of Manufacturing Technology Engineers
    • /
    • v.23 no.3
    • /
    • pp.310-317
    • /
    • 2014
  • The Next-generation High-speed Rail Technology Development Project was started in 2007 by the Korean Government with the aim of developing the core technologies for a high-speed electric multiple unit (EMU) railway system. This is the first attempt to develop a high-speed EMU railway. High-speed EMU trains have superior acceleration and deceleration compared to push-pull high-speed railways such as KTX(Korean Train eXpress). A prototype train was developed and tested on a high-speed line starting in 2012. The new train must maintain running safety during the test. Generally, the international standard (UIC518) is adopted to evaluate the running safety of trains. This method suggests that the test zone must have over 25 sections, and the length of each section must be 500 m. However, it is difficult to implement these test conditions for a real high-speed line. In this study, we analyzed the running safety using several test section lengths (100 m to 500 m) and compared the results. The results of this study will be used to establish a running safety evaluation method for high-speed EMU railways.

The effect of rolling stock vibration on running safety(derailment) (차량 진동특성이 주행안전도(탈선)에 미치는 영향)

  • Lee Kwan-Sup;Shin Yu-Jeong;Yoon Ji-Na
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.761-766
    • /
    • 2004
  • 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.

  • PDF

Evaluation for the Running Safety and Ride Comfort of Steel Composite Railway Bridge (강합성 철도교량의 주행안전성 및 승차감 평가)

  • Kim, Jung-Hun;Kang, Young-Jong;Kim, Dea-Hyeok;Han, Sang-Yun;Cha, Kyung-Ryul
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.2814-2820
    • /
    • 2011
  • Railway bridge, contact of vehicle needs to design considering the running safety about the running train load of the railway bridge, ride comfort and dynamic safety. Also, upper structure of the railway bridge has to satisfy design standard about moving load(train). So, the railway bridge has to satisfy the requirement for vertical acceleration of the bridge deck, vertical displacement of the bridge and face distortion, which is suggested railway design standard in Korea(2011.5.). In this study, it was investigated and evaluated to the running safety about the running train load of the railway bridge, ride comfort and dynamic safety with railway design standard for steel composite(Steel Box Girder) railway bridge considering KTX, freight train and standard train load.

  • PDF