A Study of Dynamic Behavior of Track and Train Interaction on Rail Open Gap

레일 개구부에서의 궤도-차량 상호작용에 대한 연구

  • 강윤석 (한국철도기술연구원) ;
  • 강영종 (고려대학교 사회환경시스템공학과) ;
  • 양신추 (한국철도기술연구원) ;
  • 조선규 (서울산업대학교 철도전문대학원) ;
  • 한상윤 (고려대학교 강구조 공학협동과정학과)
  • Received : 2006.11.15
  • Accepted : 2007.07.23
  • Published : 2007.08.27

Abstract

During winter, the CWR (continuous welded rail) may be broken when a temperature drop below the neutral level changes the axial force, causing tensile fracture and creating a rail gap. The passage of a train on a rail with an open gap may lead to very costly derailments. In this paper, the use of a track-and-train-coupled model whose rail has an open gap is proposed for dynamic interaction analysis. Linear track and train systems were coupled in this study by a nonlinear Herzian contact spring, and the complete system matrices of the total track-train system were constructed. Moreover, the interaction phenomenon considering the presence of an open gap in the rail was toughly defined by assigning the irregularity functions between the two sides of the gap. Time history analysis, which has an iteration scheme such as the Newmark-$\beta$ method (based on the Modified Newton-Raphson methods), was conducted to solve the nonlinear equation. .Finally, numerical studies were conducted to assess the effect of the various parameters of the system when applied to various speeds, open-gap sizes, and support stiffnesses of the rail.

Acknowledgement

Supported by : 한국과학재단

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