• Title/Summary/Keyword: high-speed railway system

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H Control of Secondary Suspension in Railway Vehicles Equipped with a MR Damper (MR 댐퍼가 적용된 철도차량 이차현가장치의 H 제어)

  • Shin, Yu Jeong;You, Won Hee;Hur, Hyun Moo;Park, Joon Hyuk
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.10
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    • pp.1051-1059
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    • 2013
  • In general, lateral ride comfort of railway vehicle is mainly influenced by a secondary suspension placed between the bogie and carbody. Higher operating speeds of train results in increased vibration of carbody, which has a negative impact related to the ride comfort. To solve this problem, researches to replace the conventional passive suspension with (semi)active technology in the secondary suspension of a railway vehicle have been carried out. The semi-active suspension using the magneto-rheological damper is relatively simpler system and has advantage in maintenance compared to the hydraulic type semi-active damper. This study was performed to reduce lateral vibration acceleration of carbody related to ride comfort of railway vehicles with a semi-active suspension system. The numerical analysis was conducted by replacing passive lateral damper with semi-active MR damper, and robust control with the MR damper was applied to the 1/5 scaled railway vehicle model.

Semi-active and Active Vibration Control to Improve Ride Comfort in Railway Vehicle (철도차량 승차감 향상을 위한 반능동/능동 진동제어)

  • You, Wonhee;Shin, Yujeong;Hur, Hyunmoo;Park, Junhyuk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.04a
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    • pp.248-253
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    • 2013
  • The maximum speed is one of the most important performance in high speed railway vehicle. The higher the train speed is, the worse the ride comfort is, In order to solve this problem, a semi-active or active suspension can be applied to high speed railway vehicle. The variable damper with hydraulic solenoid valve is used in the semi-active suspension. But the variable damper with hydraulic solenoid valve requires tank for supplying fluid. The MR(Magneto Rheological) damper can be considered instead of hydraulic variable damper which needs additional device, i.e. reserver tank for fluid. In the case of active suspension, hydraulic actuator or electro-mechanical one is used to suppress the carbody vibration in railway vehicle. In this study the MR damper and electro-mechanical actuator was considered in secondary suspension system of high speed railway vehicle. The dynamic analysis was performed by using 10-DOF dynamic equations of railway vehicle. The performance of the semi-active suspension and active suspension system were reviewed by using MATLAB/Simulink S/W. The vibration suppression effect of semi-active and active suspension system were investigated experimentally by using 1/5-scaled railway vehicle model.

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Train Performance Simulation and Evaluation for Korea High Speed Train (한국형 고속전철 개발열차 열차성능해석 및 평가)

  • 이태형;박춘수;신중린
    • Journal of the Korean Society for Railway
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    • v.7 no.2
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    • pp.120-124
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    • 2004
  • Computer aided simulation is an essential part in planning, design, and operation of railway systems. To determine the adequate performance and specification of railway system, it is necessary to calculate train performances such as distance, speed, power during train's running. This paper presents result of train performance simulation using the program that developed for Korea high speed train. To verify result of simulation, we have compared that with experiment data.

Optimal Location and Design of RC-Bank on Korean Electric Railway System (한국 전기철도 시스템의 RC-Bank의 최적 위치 및 설계)

  • Lee Han-Min;Kim Gil-Dong;Oh Seh-Chan;Park Sung-Hyuk
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.754-764
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    • 2005
  • This paper presents the RC-Bank installation by its optimal location and design to reduce harmonics on the Korean high-speed railway system. The system model of the Korean high-speed railway system is based on 8-port representation, which is an extension of 2-port network theory. A new proposed model is for harmonic analysis in $2\times27.5kV$ traction power supply system including feeders, contact lines, rails and autotransformers. The proposed model is developed by combining fundamental element models of the Korean high-speed railway system, and it is verified by comparing simulation results with measurement data regarding the amplification rate of harmonic currents.

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Study on Algorithm of High-Speed Scanning System for Railway Vehicle Running Units Using High Performance Camera (고성능 카메라를 이용한 철도차량 주행장치용 고속스케닝시스템 알고리즘에 관한 연구)

  • Huh, Sung Bum;Lee, Hi Sung
    • Journal of the Korean Society of Safety
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    • v.35 no.4
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    • pp.9-14
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    • 2020
  • It is necessary to apply a non-contact high-speed scanning system that can measure in real time in order to prevent the dropping and deformation of the main parts of railway vehicles during high-speed running. Recently, research on a scanning system that detects the deformation state of main parts from a video image taken using a high-performance camera has been actively pursued. In this study, we researched an analysis algorithm of a high-speed scanning system that uses a high-performance camera to monitor the deformation and drop-out state of the main components of the running units equipment in real time.

Performance Evaluation of Wheel Detection Sensor Using an Inductive Proximity Sensor for The High Speed Railway (자기유도형 근접센서를 활용한 고속철도용 차륜검지센서 성능 평가)

  • Lee, Kwang-Hee;Lee, Jong-Hyun;Suh, Ki-Bum;Yoon, Suk-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.895-901
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    • 2016
  • Nowadays, the axle counter has been developed to the wide range of the track circuit blocks as well as the wheel detection device. The axle counter, as becoming an important device for the high speed railway, must be guaranteed in accordance with the safety. With considering the safety and the high speed, performance evaluation a wheel detection sensor is described in this paper. To increase the safety, digital proximity sensor instead of analog is employed in the wheel detection sensor. Therefor the wheel detection sensor can minimize noisy signals caused by the harsh railway environments. And, to meet the high speed railway requirements, the performance of the wheel detection sensor is also successfully verified using the speed simulator at the velocity 500Km/h.

IPMSM Drives Using NPC 3-Level Inverters for the Next Generation High Speed Railway System (NPC 3-레벨 인버터를 적용한 차세대 고속전철 IPMSM의 구동)

  • Kwon, Soon-Hwan;Jin, Kang-Hwan;Kim, Sung-Je;Lee, Tae-Houng;Kim, Yoon-Ho
    • Journal of the Korean Society for Railway
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    • v.15 no.2
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    • pp.129-134
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    • 2012
  • In this paper, speed control of IPMSM drives for the next generation domestic high speed railway system using NPC 3-level inverters is presented. The NPC multilevel inverter is suitable for the high-voltage and high-power motor drive system because it has advantages in that the voltage rating of the power semiconductor devices and output current harmonics are reduced. For the speed control of IPMSM using NPC 3-level inverters, maximum torque control is applied in the constant torque region, and filed weakening control is applied in the constant power region. Simulation programs based on MATLAB/Simulink are developed. Finally the designed system is verified and their characteristics are analyzed by the simulation results.

Operation Characteristics Investigation of the Next Generation High Speed Railway System with respect to IPMSM Parameter Variation (IPMSM 파라미터 변동에 따른 차세대 고속전철 시스템의 운전 특성 고찰)

  • Park, Dong-Kyu;Suh, Yong-Hun;Lee, Sang-Hyun;Jin, Kang-Hwan;Kim, Yoon-Ho
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.3133-3141
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    • 2011
  • The next generation domestic high speed railway system is a power distributed type and uses vector control method for motor speed control. Nowadays, inverter driven induction motor system is widely used. However, recently PMSM drives are deeply considered as a alternative candidate instead of an induction motor drive system due to their advantages in efficiency, noise reduction and maintenance. The next-generation high speed train is composed of 2 converter units, 4 inverter units, and 4 Traction Motor units. Each motor is connected to the inverter directly. In this paper, the effect of IPMSM parameter variations to the system operation characteristics of the multi inverter drive high speed train system are investigated. The parallel connected inverter input-output characteristics are analyzed to the parameter mismatches of IPMSM using the 1C1M control simulator based on Matlab/Simulink.

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High-speed Railway Vehicle Collision and Derailment Safety Evaluation Research (고속철도차량 충돌 및 탈선 안전도 평가 연구)

  • Lee, Chan-Woo
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.245-250
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    • 2006
  • From the research which it sees the safety regarding a high-speed railway vehicle collision and a derailment evaluation research it an example and executed. Japan, France, Germany and Spain, Italy and with our country together it compared a high-speed railway vehicle collision of the high-speed railroad operating nation and derailed relation safety standard and safety against the evaluation system trade name comparison it analyzed. The research which it sees it led and the accident instance against the hazard analysis against the collision and a derailment of the high-speed railway vehicle and a risk evaluation together and a high-speed vehicle collision and derailed it cannot prevention plan from hereafter domestic comparison it analyzed forecast it presented.

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A Study on Aerodynamic Problems and Requirements for speed up of High-speed railway system (고속철도의 증속 시 공기역학적 문제 및 요구사항에 대한 연구)

  • Kwon, Hyeok-Bin;Kim, Dae-Sang;Nam, Seong-Won;Yoon, Su-Hwan;Park, Choon-Soo
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.20-27
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    • 2011
  • High-speed railway system is exposed to severe aerodynamic problems and has various requirements both on design and operation; 80% of running resistance is composed of aerodynamic drag, the cross-sectional area and portal shape of tunnel should be designed under aerodynamic consideration, and natural wind velocity should always be monitored to prevent the overturning of train by crosswinds. In addition, most of the aerodynamic problems are proportional to the running speed or square of the running speed. Thus, when the running speed of a high-speed railway system either on operation or under construction is to be increased, the aerodynamic problems should be assessed in advance and the countermeasures should be prepared to alleviate the aerodynamic problems to meet certain requirements. In this study, aerodynamic problems that could occur at speed up of high-speed line have been investigated and aerodynamic requirements to meet the increased operational speed have been studied referring the international and domestic rules, guidance, and recommendations.

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