• Title, Summary, Keyword: Railway vehicle

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An Efficient Algorithm for Design Sensitivity Analysis of railway Vehicle Systems (철도차량의 설계 민감도 해석을 위한 효율적인 알고리즘 개발)

  • 배대성;조희제;백성호;이관섭;조연옥
    • Proceedings of the KSR Conference
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    • pp.299-306
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    • 1998
  • Design sensitivity analysis of a mechanical system is an essential tool for design optimization and trade-off studies. This paper presents an efficient algorithm for the design sensitivity analysis of railway vehicle systems, using the direct differentiation method. The cartesian coordinate is employed as the generalized coordinate. The governing equations of the design sensitivity analysis are formulated as the differential equations. Design sensitivity analysis of railway vehicle systems is performed to show the validity and efficiency of the proposed method.

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Development of Regeneration Inverter using 3-Level Inverter (3레벨 인버터를 이용한 직류전력 회생인버터 개발)

  • 김상균;박채운;최종묵
    • Proceedings of the KSR Conference
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    • pp.1007-1012
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    • 2002
  • In this paper, a regeneration inverter is proposed using 3-level inverter. Electric regeneration means regeneration brake in electric railway vehicles. Induction motors, generally used with railway vehicles, convert the electric energy to the movement energy when vehicle is running. When the vehicle stop, the induction motor convert the movement energy to the electric energy. Usually, this energy is used with another running vehicle in the same section. If there is no vehicle around when the regeneration is occurred, regeneration energy is consumed by heat energy with resistors. The proposed inverter is capable of reuse this regeneration energy in another place.

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Vehicle/track dynamic interaction considering developed railway substructure models

  • Mosayebi, Seyed-Ali;Zakeri, Jabbar-Ali;Esmaeili, Morteza
    • Structural Engineering and Mechanics
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    • v.61 no.6
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    • pp.775-784
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    • 2017
  • This study is devoted to developing many new substructure models for ballasted railway track by using the pyramid model philosophy. As the effect of railway embankment has been less considered in the previous studies in the field of vehicle/track interaction, so the present study develops the pyramid models in the presence of railway embankment and implements them in vehicle/track interaction dynamic analyses. Considering a moving car body as multi bodies with 10 degrees of freedom and the ballasted track including rail, sleeper, ballast, subgrade and embankment, two categories of numerical analyses are performed by considering the new substructure systems including type A (initiation of stress overlap areas in adjacent sleepers from the ballast layer) or type B (initiation of stress overlap areas in adjacent sleepers from the subgrade layer). A comprehensive sensitivity analyses are performed on effective parameters such as ballast height, sleepers spacing and sleeper width. The results indicate that the stiffness of subgrade, embankment and foundation increased by increasing the ballast height. Also, by increasing the ballast height, rail and ballast vertical displacement decreased.

A Modeling and Simulation Implementation on the Power Line Disturbances by Loss of Contact for the High-Speed Railway Vehicle (고속전철 주행시 이선에 따른 전원외란 현상 모델링 및 시뮬레이션 구현)

  • Kim, Jae-Moon;Kim, Yang-Soo;Chang, Chin-Young;Gimm, Yoon-Myoung
    • Proceedings of the KSR Conference
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    • pp.1137-1142
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    • 2008
  • In this paper, an effect on power conversion unit in high-speed railway vehicle by loss of contact between a catenary system and pantograph suppling electrical power to high-speed railway vehicle are investigated. One of the most important needs accompanied by increasing the speed of high-speed railway vehicle is reduced that arc phenomenon by loss of contact brings out EMI. in case of high-speed railway vehicle using electrical power, as comparison with diesel rolling stock, PLD(Power Line Disturbance) such as harmonic, transient voltage and current, EMI, dummy signal injection etc usually occur. To analysis the effect on loss of contact, it is necessary electrical modeling system between the contact line and the pantograph according to the loss of contact. Therefore analytical model of a contact line and a pantograph is constructed to simulate the behaviour of loss of contact. The reliability of the modeling system is verified by simulation implementation on kinds of loss of contact.

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Calculation of Critical Speed of Railway Vehicle by Multibody Dynamics Analysis (다물체 동역학 해석방법을 이용한 철도차량의 임계속도 계산)

  • Kang, Juseok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.11
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    • pp.1371-1377
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    • 2013
  • In this analysis, a method is presented to calculate the critical speed of a railway vehicle by using a multibody dynamic model. The contact conditions and contact forces between the wheel and the rail are formularized for the wheelset model. This is combined with the bogie model to obtain a multibody dynamic model of a railway vehicle with constraint conditions. First-order linear dynamic equations with independent coordinates are derived from the constraint equations and dynamic equations of railway vehicles using the QR decomposition method. Critical speeds are calculated for the wheelset and bogie dynamic models through an eigenvalue analysis. The influences of the design parameters on the critical speed are presented.

Dynamic Performance Analysis of an Active Secondary Suspension for a Railway Vehicle (철도차량 능동이차현가장치의 동적 성능 해석)

  • Park, Joon-Hyuk;Shin, Yu-Jeong;Hur, Hun-Moo;You, Won-Hee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.854-855
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    • 2011
  • Active suspension technology of railway vehicles has received attention as the way to replace the current passive suspension. This paper deals with the dynamic performance of an active suspension system for a railway vehicle. To verify performance of an active suspension, the dynamic performance of the railway vehicle with active suspension system analyzed and compared with conventional suspension system by using the VI-rail program.

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Carbody Lateral Displacement of Railway Vehicle According to 2nd Lateral Damper and Track Characteristics (철도차량 2 차 횡댐퍼 및 궤도특성에 따른 차체 횡변위 변화 연구)

  • You, Won-Hee;Shin, Yu-Jeong;Hur, Hyun-Moo;Park, Joon-Hyeok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.722-728
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    • 2012
  • In railway vehicle, riding comfort depends mainly on the secondary lateral damper and track condition. When the damping force of lateral damper becomes abnormal condition or the track condition is worse, the running stability and ride comfort of the railway vehicles go down. In addition, the lateral motion of carbody is increased. Therefore, the lateral motion of carbody is reviewed carefully by considering lateral damping force and track condition of the railway line in design stage. In this study, the lateral displacement of carbody was studied in accordance with lateral damping force and track condition. The target vehicle is EMU for subway line.

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Comparison Study of Sound Transmission Loss in High Speed Train

  • Kim, Tae-Min;Kim, Jeung-Tae
    • International Journal of Railway
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    • v.4 no.1
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    • pp.19-27
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    • 2011
  • Many studies for improving the railway vehicle's performance and comfort such as speed, weight and noise are currently in progress. Improving the structural characteristics of the vehicle for greater noise insulation is considered important for reducing disturbance due to noise, but measuring transmission loss entails large costs. This study explores an alternative method for estimating and measuring the railway vehicle's transmission loss that involves on applying the numerical analysis coupled with scaled reverberation chamber measurement. The transmission loss measurement using scaled reverberation chamber was performed after the compensation value was found through 1mm thickness(1t) specimen. For numerical analysis, a commercially available acoustics solver VA ONE was used. The proposed method is found to lead to transmission loss measurement comparable to the measurements based on large-scale reverberation chamber. Thus, it can be argued that a reliable method has been developed for measuring railway vehicle's transmission loss.

Energy Regenerative Damper Applied to the Railway Vehicle (철도차량의 현가장치로서 에너지 재생 댐퍼 이용에 대한 고찰)

  • Kim Sang-Soo;Park Chun-Soo;Mok Jin-Yong;Seo Sung-Il;Lee Tae-Hyung;Kim Ki-Hwan
    • Proceedings of the KSR Conference
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    • pp.375-380
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    • 2004
  • Vibration of railway vehicle has harmful effect to dynamic performances of railway represented to stability, safety and ride comfort. Hence reduction of vibration has been discussed as an important problem and has been widely investigated. A new technology of vibration control, energy regenerative control, is introduced. Energy regenerative damper using this new vibration control converts vibration energy into other kind of energy that we can utilize. In this paper, this energy regenerative damper is applied to the dynamic absorber and vehicle suspension. And it is evaluated whether the energy regenerative railway vehicle suspension is possible.

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Sound transmission loss measurement of railway vehicle floor using semi-reverberation room (간이잔향실을 이용한 철도차량 바닥재의 음향투과손실 측정)

  • Shin, Bum-Sik;Chun, Kwang-Wook;Choi, Yeon-Sun
    • Proceedings of the KSR Conference
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    • pp.1420-1425
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    • 2008
  • This study is to examine the sound transmission loss of a railway vehicle floor. To this end, a semi-reverberation room was constructed. The semi-reverberation room was made of a railway vehicle floor between the sound radiating chamber and the sound receiving chamber. To block the sound, the wall was made of acryl, urethane foam, wood, and glass fiber. The test followed the KS F 2808 standard, and a typical reverberation room was used to verify the performance of the semi-reverberation room. As a result, comparison of the measurements showed that the test results of the semi-reverberation room had the same tendency as those of the reverberation room. Consequently it was possible to measure the sound transmission loss of railway vehicle structures using the semi-reverberation room.

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