레일절손부에서의 차량-궤도 동적상호작용

In this study, the track and train coupled model with 10 degree of freedom was developed for dynamic interaction analysis in two dimensional space. Linear track and train systems was coupled by the nonlinear Herzian contact spring. And then the dynamic solution technique for the coupled equation of motion using was applied to minimize the errors. An iteration scheme such as modified Newton-Raphson methods was employed to solve these nonlinear equations. Interaction phenomenon considering open gap, which has not been clear yet, was toughly defined by assigning the irregularity functions, which express the open gap width and height difference between the two sides of a gap. And then numerical studies are performed to assess the effect of various parameters of track system with open gap. A track-train interaction model with open gap developed in this study is verified by the other numerical studies and the field test results. The solution technique of track and train coupled system considering rail open gap developed herein may predict the dynamic response of train and track quite properly, apply to various speeds, open gap size and the support stiffness of rail.