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안정화된 Penalty방법에 의한 접촉력 산정법과 요철부 통과시의 차륜-레일간 접촉분리 현상
정근영(Chung Keun-Young),이성욱(Lee Sung-Uk),이석무(Lee Seok-Mu) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, to describe vehicle-structure dynamic interaction phenomena, nonlinear Hertzian contact spring and nonlinear damper are adopted. The external loads acting on vehicle model are the self weight of vehicle and the displacement constraint equation of contact point. The displacement constraint is implemented by the Penalty method with stabilization. The penalty force, in the stabilized penalty method, is dependent on not only prescribed displacement but also velocity of contact point. In the time integration of dynamic equations of motion, Newmark time integration scheme is adopted, and the velocity of contact point is estimated by Newmark integration concept. To reduce the error caused by inadequate time step size, adaptive time-stepping technique is also adopted. As the nonlinear Hertzian contact spring is adopted in this study, separation of wheel-rail contact can be described. In numerical it is found that separation of contact between wheel and rail can be occur due to geometric imperfection of the rail to surface. In numerical test, the stabilized penalty method show good accuracy of result and it is expected that more versatile dynamic interaction phenomena can be described more accurately.
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