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在电机轴悬式机车-轨道垂向耦合动力学模型的基础上,考虑了机车的纵向运动自由度,通过对比牵引工况下考虑和不考虑轨道弹性时的轮轨作用力及轮对振动加速度,得到了轨道弹性变形对轮对轮轨切向力及其纵向振动的影响规律。研究结果表明,当轮轨界面无不平顺激扰时,考虑或忽略轨道结构的弹性对轮对牵引力的发挥及纵向振动影响不大;在不平顺激扰下,轨道结构参与轮轨间的耦合振动,由于轨道垂向的弹性及阻尼作用,轮轨垂向力特别是高频力得到缓冲及衰减,致使50Hz以上高频段的轮轨切向力及轮对纵向振动变的缓和,利于轮周牵引力的稳定发挥。总体上,分析模型中若不考虑轨道弹性会造成预测的轮轨切向力及轮对振动加速度偏大。
Based on the dynamic coupling model of the motor shaft-suspended locomotive-rail vertical coupling, the freedom of longitudinal motion of the locomotive is considered. By comparing the wheel-rail force and the vibration acceleration of the wheel with or without considering the elastic of the track under the traction condition, , The influence of track elastic deformation on the wheel-rail tangential force and its longitudinal vibration was obtained. The results show that when the wheel-rail interface is not disturbed smoothly, considering or neglecting the elasticity of the orbital structure has little effect on the exertion of the traction force and the longitudinal vibration of the wheelset. Under irregular interference, the orbital structure participates in the coupling vibration between the wheel and rail Due to the vertical elasticity and damping of the track, the wheel-rail vertical force, especially the high-frequency force, is buffered and attenuated, resulting in the relaxation of the wheel-rail tangential force and wheelset longitudinal vibration in the high frequency range above 50 Hz, which is conducive to the stability of the wheel circumference traction force Play In general, the analysis of the model without orbital elasticity will cause the predicted wheel-rail tangential force and wheel-on vibration acceleration is too large.