動摩擦係数を考慮した3次元接触理論に基づく粘着力のモデル化(<小特集>TRANSLOG2009/J-RAIL2009)

概要

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Carter's theory is famous adhesion model in railway braking technology. However, the range the adhesion force characteristic cannot express over 0.2% range. Recently, the studies about adhesion model using automobile tire. The author had proposed the beam model for adhesion force model which can express adhesion force in all slip ratios for railway vehicles at braking. However, it has a problem that the contact pressure distribution is different from Hertz theory. Kalker reported wheel-rail contact theories based on Hertz contact pressure, however those were not considered dynamic friction coefficient in slipping area. Moreover, This paper will present the simulation results about adhesion force model considered dynamic friction coefficient in all slip ratios based on three-dimensional contact theory. Proposed adhesion model is described only longitudinal direction not considered spin creep for wheel slip prevention of brake dynamics for railway systems. Calculation method of proposed adhesion model based on three-dimensional Hertz contact is finite element method.
2010-10-25