Abstract:Through the analysis of threedimensional(3D)thickness conditions diagram of the wheel/rail load and parameter of running,it is found that water medium has elasticisoviscosity characteristic.Therefore,combining the Grubin’s simplify elastic hydrodynamic lubrication model with GreenwoodTripp’s microsolid contact theory,the simplified 3D numerical model of high speed wheel/rail under water medium conditions was set up.The analysis indicates that the model can well reflect the wheel/rail adhesion conditions,and the calculation process of the model is simplified for the solution of the Reynolds equation iteratively can be avoided.The effects of speed,roughness,contact pressure and boundary friction coefficient on adhesion coefficient were studied.The results indicate that the speed and roughness have a greater effect on adhesion coefficient compared with other factors.Along with the increase of speed,the adhesion coefficient is decreased and with the increase of roughness,the adhesion coefficient is increased firstly,and then reaches a certain stable value.