中国铁道科学2025，Vol.46Issue(3)：21-31,11.DOI:10.3969/j.issn.1001-4632.2025.03.03
轮轨黏着状态对动力集中动车组动力车蛇行运动稳定性影响
Influence of Wheel/Rail Adhesion Condition on the Power Car Hunting Stability of Power-Concentrated EMU
摘要
Abstract
This study investigates the power car hunting stability of push-type power-concentrated EMU under complex wheel/rail adhesion conditions at 160 km/h.The root locus analysis is conducted through the established 17-degree-of-freedom simplified lateral model of the EMU.Using a nonlinear numerical simulation method,the hunting bifurcation behavior and stochastic vibration characteristics of the locomotive under different wheel/rail equivalent conicity and contact conditions are analyzed.And the influence of different wheel/rail friction coefficients and traction force on the hunting stability of the low-conicity carbody for the power car of power-concentrated EMU are studied.The results show that the vehicle hunting mode couples with other inherent modes under low wheel/rail equivalent conicity,resulting in insufficient system damping that triggers carbody hunting instability,thus inducing low-frequency lateral abnormal vibration for the power car.Wheel/rail adhesion states significantly affect the carbody hunting stability,and a low wheel/rail interface friction coefficient markedly reduce both the minimum damping ratio and hunting frequency of the vehicle while decreasing the nonlinear bifurcation critical velocity.The large traction force with low wheel/rail friction coefficient will exacerbate creep saturation phenomenon,further reducing nonlinear bifurcation critical velocity and hunting frequency.While the lateral vibration acceleration of carbody does not intensify with the wheel/rail adhesion deterioration,its amplitude will increase when the hunting frequency approaches the vehicle inherent frequency of 1.1 Hz.Comparative analysis demonstrates that the lateral force of wheel axle provides more reliable evaluation for carbody hunting stability of EMU than bogie lateral vibration acceleration amplitude.关键词
动力集中动车组/轮轨摩擦系数/牵引力/蛇行运动/稳定性/轮轴横向力/振动加速度Key words
Power-concentrated EMU/Wheel/rail friction coefficient/Traction force/Hunting motion/Stability/Lateral force of wheel axle/Vibration acceleration分类
交通工程引用本文复制引用
张恒,张志超,吕凯凯,储高峰,凌亮,翟婉明..轮轨黏着状态对动力集中动车组动力车蛇行运动稳定性影响[J].中国铁道科学,2025,46(3):21-31,11.基金项目
国家自然科学基金资助项目(52388102,U2268210) （52388102,U2268210）
中国铁道科学研究院集团有限公司院基金课题(2022YJ262) （2022YJ262）
