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Analysis of the Critical Speed and Hunting Phenomenon of a High Speed Train

고속전철의 임계속도와 헌팅현상 해석

  • Song, Ki-Seok (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Koo, Ja-Choon (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Choi, Yeon-Sun (School of Mechanical Engineering, Sungkyunkwan University)
  • Received : 2014.08.01
  • Accepted : 2014.10.09
  • Published : 2014.10.31

Abstract

Contact between wheel and rail leads to the creep phenomenon. Linear creep theory, assuming linear increase in the creep force vs creep, results in a critical speed at which the vibration of a railway vehicle goes to infinity. However, the actual creep force converges to a limited value, so that the vibration of a railway vehicle cannot increase indefinitely. In this study, the dynamics of a railway vehicle is investigated with a 6 DOF bogie model includingthe nonlinear creep curves of Vermeulen, Polach, and a newly calculated creep curve with strip theory. Strip theory considers the profiles of the wheel and rail. The results show that the vibration of a railway vehicle results in a limit-cycle over a specific running speed, and this limit-cycle becomes smaller as the slope of the creep-curve steepens. Moreover, a hunting phenomenon is caused due to flange contact, which restricts the magnitude of the limit-cycle.

Acknowledgement

Supported by : 국토교통부

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