Abstract
The purpose of this study is to formulate a three-dimensional motion of a wheelset considering contact geometry by applying techniques of multibody dynamics and to analyze behavior of a wheelset on the rail with vertical track irregularity. The differential algebraic equation is solved by the augmented formulation with Lagrange multipliers, using generalized coordinates and non-generalized surface parameters that describe the contact point. The slip at the contact point between wheel and rail is generated and the creep forces are caused. Due to the creep force, the hunting motion occurs. The increase of rolling speed and the amplitude of the track irregularity is very effective on the fluctuation rate of wheel load.
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