• Title, Summary, Keyword: 차륜

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Dynamic Analysis of Railway Vehicle with Wheel Unbalance (차륜 불평형이 있는 철도차량의 동적해석)

  • Lee, Seung Il;Choi, Yeon-Sun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.11
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    • pp.1387-1395
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    • 2013
  • When the center of mass of a railway wheel is not aligned with the geometrical center of the wheel axis, wheel unbalance occurs. If a railway vehicle runs without removing the wheel unbalance, vibrations will be produced. This will also cause wear and damage of the axle bearing. In this study, dynamic analysis of a railway vehicle with wheel unbalance was conducted to examine the reduction in critical speed and the resonance of the car-body and the effect on the magnitude of wheel unbalance was examined. In addition, the calculation of the car-body vibration owing to static and dynamic unbalance in the railway wheel shows that two-plane balancing is necessary.

Characteristics of Wheel Tread for Urban Train Based on Contact Positions (접촉위치에 따른 도시철도 차륜 답면의 특성 변화)

  • Kwon, Seok-Jin;Noh, Hang-Nak;Nam, Yoon-Su;Seo, Jung-Won;Lee, Dong-Hyung
    • Journal of the Korean Society for Railway
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    • v.11 no.6
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    • pp.524-529
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    • 2008
  • The damaged wheel in railway vehicle would cause a poor ride comfort, a rise in the maintenance cost and even fracture of the wheel, which then leads to a tremendous social and economical cost. The defect initiation and crack propagation in wheel may result in the damage of the railway vehicle or derailment. Therefore, it is important to evaluate the characteristics of the wheel tread. In the present paper, the characteristics of wheel tread based on contact positions, running distance and brake pattern are evaluated. The result shows that the damaged wheel tread is remarkably depended on the contact positions between wheel and rail.