ABSTRACT
This paper studied the estimation of the relationship between wheel-rail equivalent conicity and the dynamic behaviors of high-speed EMU. Construct vehicle multibody system dynamics model combined with actual measured wheel and rail profile with the help of computational multi-body system dynamics theory and non-linear Hertz contact theory. The effect of the worn Wheel/Rail relationship on transverse vibration of framework is investigated. It is pointed that the transverse acceleration of frame caused by long-term unpolishing rail is obviously higher than those of once and twice polishing rail. During the testing process, there is a increasing trend in equivalent conicity with the increase of running distance. The results indicate that the reasons for the deterioration of EMU lateral stability and points out that the critical factor leading to which is equivalent conicity exceed normal value. The main reason for poor contact between wheel and rail is found to be gauge angle wear and camber wear that caused by tread concave wear and rail head has not been polished for a long time.
