Dynamic Interaction of Track and Train System on Open Gap by Rail Breaks

레일 파단시 장대레일 개구부에서의 궤도-차량 동적상호작용

  • 강윤석 (한국철도기술연구원 차륜궤도연구실) ;
  • 강영종 (고려대학교 건축.사회환경공학과) ;
  • 양신추 (한국철도기술연구원 차륜궤도연구실)
  • Received : 2007.01.10
  • Accepted : 2008.04.08
  • Published : 2008.11.30

Abstract

CWR (Continuous Welded Rail) may be broken when a temperature drop below the neutral temperature changes in axial force, causing tensile fracture and rail gap, in winter. Rail-breaks may lead to the damage of the rail and wheel by dynamic load, and the reduction of running safety if not detected before the passage of a train. In this study, the track and train coupled model with open gap for dynamic interaction analysis, is proposed. Linear track and train systems is coupled by the nonlinear Herzian contact spring and the complete system matrices of total track-train system is constructed. And the interaction phenomenon considering open gap, was defined by assigning the irregularity functions between the two sides of a gap. Time history analysis, which have an iteration scheme such as $Newmark-{\beta}$ method based on Modified Newton-Raphson methods, was performed to solve the nonlinear equation. Finally, numerical studies are performed to assess the effect of various parameters of system, apply to various speeds, open gap size and the support stiffness of rail.

Acknowledgement

Supported by : 한국과학재단

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