• Title, Summary, Keyword: Rail Stability

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A Running Stability Test of 1/5 Scaled Bogie Using Small Scale Derailment Simulator (소형탈선시뮬레이터를 이용한 1/5 축소대차의 주행안정성 시험)

  • Eom, Beom-Gyu;Lee, Se-Yong;Lee, Young-Yeob;Kang, Bu-Byoung;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • pp.2600-2608
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    • 2011
  • The dynamic stability of railway vehicle has been one of the important issues in railway safety. The dynamic simulator has been used in the study about the dynamic stability of railway vehicle and wheel/rail interface. Especially, a small scale simulator has been widely used in the fundamental study in the laboratory instead of full scale roller rig which is not cost effective and inconvenient to achieve diverse design parameters. But the technique for the design of the small scale simulator for the fundamental study about the dynamic characteristics of the wheel-rail system and the bogie system has not been well developed in Korea. Therefore, the research about the development of the small scale simulator and the bogie has been conducted. As this paper, To predict the dynamic behavior of railway vehicle, we studied running stability test of 1/5 scaled bogie that similarity laws is applied using small scale derailment simulator. For the operation of the small scale derailment simulator, it is required to investigate the performance and characteristics of the system. This could be achieved by a comparative study between an analysis and an experiment. This paper presented the analytical model which could be used for verifying of the test results and understanding of the physical behavior of the dynamic system comprising the small scale bogie and the simulator.

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Noise and Vibration Solutions Considering Stability Effects for High-Speed Rail ChonAn Station in Korea (한국고속철도 천안역사에 대한 소음 및 진동영향 연구)

  • Kweon Young-Cheol
    • Proceedings of the KSR Conference
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    • pp.848-853
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    • 2005
  • The objective of this paper is to address to the providing an adequate noise and vibration solution, required for High Speed Rail while maintaining the stability criteria of the ChonAn station structure, the first constructed in Korean High Speed Railway. The significant acoustic pressure level will be induced by the high speed trains passing-by. Therefore, the high level study of this case is necessary. The acoustic pressure level of 85 dB(A) inside the ChonAn station is expected, and the spaces below concrete slab are not suitable for commercial purpose, thus installation of filtering systems (spring boxes containing viscous dampers, ballast mats and acoustic shield) are provided to reduce the effect of the noise and vibration to acceptable level of 55 dB(A). But, a major drawback of application of the previously conducted experimental results was that the actual effect of installation of filtering system was never been validated. Therefore, the acquisition of noise and vibration on the present structure were obtained and compared to the computer simulations. These predicted the behavior of the station reasonably well. Also, the installation of filtering systems gave the superior reduction on noise and vibration. This application is successfully adapted without scarifying stability criteria related to the structural stability including excessive deformations or displacements. Three traffic operation safety limits: deck vertical acceleration, deflection of the structure, and longitudinal displacement of the slab were satisfactory.

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Sensitivity of the ballast resistance and track irregularity on the track stability (궤도 안정성에 대한 도상저항력과 궤도틀림의 민감도)

  • Lim, Nam Hyoung;Choi, Sang Hyun;Lee, Chin Ok;Sung, Ik Hyun
    • Journal of Korean Society of Steel Construction
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    • v.17 no.5
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    • pp.519-526
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    • 2005
  • During summer, very high compressive force occurs on the continuous welded rail (CWR) track because of the increase of rail temperature (max. $60^{\circ}C$). This extreme temperature stress can cause the CWR track to buckle. Among many CWR parameters affecting the track buckling, the influence of the lateral and longitudinal ballast resistance was investigated on the stability of the CWR track in this study. Also, the sensitivity of the track irregularity such as the alignment defect and the gauge irregularity was investigated.

Management Plan of Light Rail Transit System (경량전철 시스템 시험선 운영 방안)

  • Lee, H.M.;Lee, A.H.;Han, S.W.
    • Proceedings of the KIEE Conference
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    • pp.1657-1659
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    • 2005
  • Test track of the Light Rail Transit(LRT system was developed and organically combined with technologies of power supply system, signal communication system and track structure The purpose of the test track is a acquiring of reliability and stability through a sufficient performance test Therefore, this paper draws up ail management plans for tests of the LRT system

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The Improvement of Control Performance for a Magnetic Levitation System (자기부상 시스템의 성능개선)

  • Kim, Jong-Moon;Kang, Do-Hyun;Park, Min-Kook
    • Proceedings of the KIEE Conference
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    • pp.864-866
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    • 2003
  • In this paper, the improvement of control performance for a magnetic levitation system is presented. The model of a single-magnet system with rail is derived. As a conventional controller, PID controller is designed and implemented. This controller has a narrow stability margin due to low-order controller structure so that it cause unstability for a flexible rail. So to improve the control performance and stability margin, a robust controller as a new controller is designed and implemented using a VME-based digital controller. As a result, the controller performance of the new designed controller is better than that of the conventional controller.

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Critical speed analysis of the High-Speed EMU (분산형 고속전철의 임계속도 해석)

  • Shin, Bum-Sik;Lee, Seung-Il;Lee, Sang-Won;Koo, Ja-Choon;Choi, Yeon-Sun
    • Proceedings of the KSME Conference
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    • pp.973-978
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    • 2008
  • This study concerned on the critical speed due to hunting and snake motion train to ensure the stability. First, the critical speed was calculated by using a numerical model, and calculated the critical speed of the vehicle through the simulation with the use of ADAMS/RAII. Also, the snake motion was confirmed through a modal analysis and running simulation. The calculated results, show that the rail irregularity becomes the influential factors of the stability since it is the direct source of excitation of the vehicle.

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The Development of Rail-Transport Operation Control based on Unsaturated Soil Mechanics Concept (불포화토이론을 이용한 강우시 열차운전규제기준 개발)

  • Kim, Hyun-Ki;Shin, Min-Ho;Kim, Soo-Sam
    • Journal of Korean Society of Hazard Mitigation
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    • v.4 no.1
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    • pp.25-31
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    • 2004
  • Infiltration of rainfall causes railway embankment to be unstable and may result in failure. Basic relationship between the rainfall and stability of railway embankment is defined to analyze the stability of embankment 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. Therefore, it is judged that this rainfall index can be a good tool for the rail-transport operation control.

Dynamic Analysis for Improvement of Running Stability of Rubber Tired AGT Localization Bogie (고무차륜 경량전철 국산화 대차의 주행안정성 향상을 위한 동특성 해석)

  • Eom, Beom-Gyu;Lee, Hi-Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.4
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    • pp.307-317
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    • 2012
  • The LRT(light rail transit) system, which has medium transport capacity between subway and bus is an advanced transportation system. It has many benefits like chap construction and operational cost down through driverless and flexible route planning. The rubber tired AGT(K-AGT) is a kind of LRT, which has rubber wheels and side guides. The side guides has many advantages, but brings vibration and noise problems from the friction between the guide rail and the wheels. This is the major source for the of passengers' discomfort. The purpose of this paper is to analyze dynamic characteries and running stability of the rubber tired AGT localization bogie if the AGT's speed is increased from 70 km/h to 80 km/h. The current design parameters of bogie suspension, as it is designed, was examined to satisfy the comfort index of the railway vehicle in performance test.

Evaluation on Allowable Vehicle Speed Based on Safety of Track and Railway Bridge (궤도 및 교량 안전성을 고려한 열차 증속가능 속도대역 평가)

  • Bahng, Eun Young
    • Journal of the Korean Society of Safety
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    • v.33 no.2
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    • pp.145-151
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    • 2018
  • In this study, the track-bridge interaction analysis was performed using an analytical model considering the track structure, thereby taking into account the linear conditions (R=650 m, cant variation $160{\pm}60mm$) and the dynamic characteristics of the bridge. As a result of the study, the allowable speed on the example bridge considered was calculated at 200 km/h based on vertical deflection, vertical acceleration, and irregularity in longitudinal level, but was also evaluated at 170km/h based on the coefficient of derailment, wheel load reduction, and lateral displacement of the rail head. It is considered desirable to set the speed 170km/h to the speed limit in order to secure the safety of both the bridge and the track. It is judged that there will be no problems with ensuring rail protection and train stability in the speed band.

Running Performance Analysis of an Articulated Light Rail Vehicle (관절형 경량전철의 주행성능 해석)

  • Hur, Shin;Park, Chan-Kyung;Han, Hyung-Suk;Ha, Sung-Do
    • Proceedings of the KSR Conference
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    • pp.159-166
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    • 1999
  • In this paper, running performance analyses of an articulated light rail vehicle are carried out using VAMPIRE software package. The stability analysis to determine the critical speed and the safety analysis such as derailment coefficients, lateral forces of wheels and reduction of wheel load are carried for the track conditions of straight, transition and curving range to the operating velocity of 40km/h. Also, ride quality is analyzed. As the results of analysis, the safety of light rail vehicle satisfied with the limit values and the ride quality for tare and full load condition was shown to the "not uncomfortable" level in ISO 2631-1 (1997) criteria.

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