• Title, Summary, Keyword: Railway vehicle

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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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Dynamic Analysis of Railway Vehicle Using Mathematical Modeling of High-Speed EMU (분산형 고속전철의 34자유도 동역학적 모델링을 통한 철도차량의 동적 특성 해석)

  • Lee, Rae-Min;Lee, Pil-Ho;Lee, Sang-Won;Koo, Ja-Choon;Choi, Yeon-Sun
    • Proceedings of the KSR Conference
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    • pp.1426-1434
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    • 2008
  • This paper addresses the numerical study on the dynamics of the High-speed EMU to enhance the ride quality. The 17 and 34 degrees-of-freedom (DOF) dynamic models for a single railway vehicle are proposed, and its vibrational characteristics according to the nonuniform rail profile are analyzed via Matlab. The validity of the proposed 34-DOF model are verified by comparing its dynamic characteristics and those from ADAMS/Rail. In addition, the critical dynamic parameters are identified by the parametric analysis, and rough design variables to reduce the vibration level of the railway vehicle are proposed. Finally, the frequency analysis - FFT - are conducted to extract the resonant frequencies, which have a significant influence on the determination of the critical speed of the railway vehicle. It is demonstrated that the results from the Matlab-based numerical analysis of the 34-DOF dynamic model are similar to those from ADAMS/Rail.

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Calculation of Maintenance Cost for RCM Analysis of Railway Vehicle (철도차량의 RCM 분석을 위한 유지보수비용 산출방안)

  • Lee, Chang-Hwan;Park, Byoung-Noh;Lim, Sung-Soo
    • Proceedings of the KSR Conference
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    • pp.1481-1486
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    • 2008
  • To apply more effective the RCM analysis for railway vehicle, the maintenance cost per equipment should be considered together with failure criticality per equipment considered in existing. This paper is described the systematic calculation of maintenance cost considering the RCM analysis of railway vehicle. To calculate the maintenance cost systematically, the cost breakdown structure was established, and basic cost information and calculated cost items were defined. In addition, the linking between calculated cost and RCM analysis was considered. In future, this proposal would be used to analysis of cost effectiveness through RCM analysis of railway vehicle.

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Comparative Study on Application of Korean Railway Safety Law and Urban Transit Safety Law to Urban Maglev Vehicle in Crashworthiness Regulations (도시형 자기부상열차에 대한 철도안전법과 도시철도안전법의 충돌안전기준 적용의 비교 연구)

  • Lee, Hyun-Cheol;Koo, Jeong-Seo
    • Proceedings of the KSR Conference
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    • pp.748-754
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    • 2008
  • This paper studied on the application of Korean Railway Safety Law and Urban Transit Safety Law in Crashworthiness Regulations to the urban maglev vehicle of KIMM. The crashworthiness regulations for urban transit vehicle should be satisfied to the urban maglev vehicles according to crash analysis results using the explicit finite element method. However, according to its numerical results, the crashworthiness regulations of Korean Railway Safety Law were partially satisfied except the coupling and shunting condition. When a commercial urban maglev vehicle is developed in the near future, the crashworthiness regulations of Korean Railway Safety Law should be considered and satisfied during its structural design stage in some details

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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.

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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A Study for Roll characteristic of Railway Vehicle (철도차량의 Roll 특성에 관한 연구)

  • Yang, Hee-Joo;Lee, Kang-Wun;Park, Kil-Bae;Seong, Jae-Ho
    • Proceedings of the KSR Conference
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    • pp.1184-1189
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    • 2006
  • Railway vehicle have three translational motions-longitudinal, vertical and lateral, and three rotational motions-rolling, pitching and yawing caused by track irregularity, wheel and rail characteristic, dynamic behaviors etc. The rolling motion in vehicle mainly happens in cases of the vehicles stationary and running on canted track. When the vehicle positioned in stationary on canted track, vehicle is inclined toward inside of installed cant due to gravity component. When the vehicle has running on a track with cant deficiency, vehicle is inclined toward outside of installed cant due to centrifugal force. The roll coefficient(s) is defined as the ratio between the angle of inclination of the vehicle($\eta$) and the angle of the rail level($\alpha$). This paper has noted the test method, test result and analysis result to calculate the roll coefficient according to UIC505-5, international standard

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A Study on the Test Standards at Low Temperature of Rubber Suspension Components of Railway Vehicle (철도차량 고무 현가부품의 내한성 시험기준연구)

  • Yoon, Tae-Ho;Jang, Seung-Ho;Choi, Byoung-Il;Lee, Chan-Woo;Na, Hee-Seung
    • Proceedings of the KSME Conference
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    • pp.372-376
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    • 2004
  • In this paper, the standard test methods at low temperature of rubber suspension components of railway vehicle are investigated and reviewed. In order to connect the TKR(Trans-Korean Railway)-TSR(Trans-Siberian Railway), it is necessary to evaluate the performance of rubber suspenion components of railway vehicle. In the current Korean Standard, the test method at low temperature of railway vehilce components and the test method of rubber bellows of air spring are specified. But, the specified test temperature is higher than the the operating temperature of TSR railway. So, the in-depth research for the test method and performance evaluation technique of rubber suspension component at low temperature is necessary and current KS code should be adjusted.

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Scale Modeling Technique for the Crash Analysis of Railway Vehicle Structure (철도차량 충돌 해석을 위한 축소모델링 기법 연구)

  • 김범진;허승진
    • Journal of the Korean Society for Railway
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    • v.5 no.4
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    • pp.231-236
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    • 2002
  • Todays, crash safety requirements of the railway vehicle structures become important design criterion according to the increased driving speed and the lightweight construction. Although the crash analysis using computer simulation can be effectively applied to predict the crash performance of the railway vehicles in the early design stage, the optimized design w.r.t the crash safety could be realized by the crash tests with actual prototype vehicles. However, it is very expensive and time-consuming task to perform the crash test of the railway vehicles. As a measure to cope with the problem, in this paper, the scale modeling technique is suggested and experimentally verified to predict the impact energy absorption characteristics of full scale model of aluminum extrusions sub-structures and the high-speed railway vehicle structure.

A Study on the Rolling Stock Scheduling considering maintenance activities in Railway (유지보수를 고려한 철도차량 운용계획에 관한 연구)

  • Kim Dong-Hee;Hong Sun-Heum
    • Proceedings of the KSR Conference
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    • pp.280-285
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    • 2003
  • The process of railway traffic planning is composed of several steps such as long-term, mid-term. short-term, and real-time plan. The planning of vehicle and manpower resources is a main research topic in tactical short-term planning step. Railway vehicle is usually consisted of a power car, passenger/freight cars and human resource is composed of engine driver, cabin crew, ground personnel. So far, power car was main research target in railway vehicle scheduling problem. Recently according as the light electric railway or high-speed railway is introduced, the operational planning of trainset vehicles become important, In this paper, we introduce the conceptional model for trainset restoring problem and developed heuristic algorithm.

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