关键词: 钢轨打磨, 车辆动力学, 轮轨匹配关系, 蛇行稳定性

Abstract: Aiming at two typical rail grinding deviations existed in China's high speed railways, a multi-body dynamics model of a China's certain type of electric multiple units(EMU) vehicle was established. The influences of the rail shoulder overgrinding and the rail head overgrinding on the wheel-rail matching relationships, the vehicle's hunting stabilities and running performances were analyzed. The simulations suggest that the positions of the contact points will be biased toward the outer ends of the treads and rail heads when rail shoulder overgrinding, which will lead to a low-conicity wheel-rail contact. Consequently, the so-called carbody hunting instability arises, and the carbody lateral acceleration increases and the sperling index deteriorates at the speed ranges where the bogie hunting motion excites. By contrast, in the case of rail head overgrinding, wheel rail contact points trend to be concentrated on the root parts of the tread throat and the rail shoulder, the so-called bogie hunting instability will be induced due to the extremely high-conicity wheel-rail contacts and the EMU frame lateral acceleration is forced to “alarm”. Thus, in order to improve the hunting stability and operation quality of the high speed trains, the grinding accuracy should be strictly controlled and the standard profiles should be the target profiles.

Key words: rail grinding, vehicle dynamics, wheel-rail matching relationship, hunting stability