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Dynamic Analysis of Railway Vehicle with Wheel Unbalance

차륜 불평형이 있는 철도차량의 동적해석

  • Lee, Seung Il (Dept. of Railway Vehicle System Engineering, Korea Transportation Nat'l Univ.) ;
  • Choi, Yeon-Sun (School of Mechanical Engineering, Sungkyunkwan Univ.)
  • 이승일 (한국교통대학교 철도차량시스템공학과) ;
  • 최연선 (성균관대학교 기계공학부)
  • Received : 2013.06.04
  • Accepted : 2013.09.04
  • Published : 2013.11.01

Abstract

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.

차륜 불평형은 차륜의 무게중심이 윤축의 기하학적 중심축에서 벗어나 있을 때 발생한다. 차륜 불평형을 수정하지 않고 주행하면 불평형에 의한 원심력이 차체의 진동을 발생시키게 되며 차륜의 마모를 촉진시키거나 차축 베어링에 손상을 주게 된다. 본 연구에서는 철도차량 동적해석을 통하여 차륜 불평형이 차량 임계속도와 차체 진동에 미치는 영향을 검토하였다. 차륜 불평형은 임계속도를 감소시키고 차체 공진을 유발할 수 있음을 알 수 있었다. 또한 차륜의 정적, 동적 불평형에 따른 차체진동을 해석함으로써 불평형 수정은 양면 밸런싱이 필요함을 밝혔다.

Acknowledgement

Supported by : 국토해양부

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