重载铁路钢轨波磨区段的车辆-轨道动力学特性

Vehicle-Track Dynamic Characteristics in Rail Corrugation Section of Heavy Haul Railway

针对重载铁路存在的钢轨波磨问题,基于多体动力学理论,建立重载列车-轨道动力学耦合模型,计算分析波磨特征、曲线半径以及超高状态对车辆-轨道动力学特性的影响。结果表明:钢轨波磨波长越小,波深越大,则轮轨垂向力、横向力波动幅值越大,安全性指标、侧架和轮对的垂向加速度越大,对车辆-轨道动力学特性的影响越明显;曲线半径越小,轮轨垂向力、横向力波动幅值越大,安全性指标、侧架和轮对的垂向加速度也越大;从欠超高20 mm到过超高20 mm,内轨垂向力、横向力极值不断增大,外轨垂向力、横向力极值不断减小,脱轨系数逐渐增大,轮重减载率先减小后增大,超高状态对侧架和轮对垂向加速度的影响不大。

Aiming at the problem of rail corrugation in heavy haul railway,based on multi-body dynamics theory,a coupling model of heavy haul train-track dynamics was established to calculate and analyze the influence of corrugation characteristics,curve radius and superelevation state on vehicle track dynamics.The results show that the smaller the rail corrugation wavelength and the greater the wave depth,the greater the amplitude of wheel rail vertical force and lateral force fluctuations will be,the greater the safety index,the vertical acceleration of side frame and wheel set,and the more obvious the impact on vehicle track dynamic characteristics will be.The smaller the curve radius is,the greater the fluctuation amplitude of wheel rail vertical force and lateral forces,and the safety index,side frame and wheel set vertical acceleration are.From 20 mm under superelevation to 20 mm over superelevation,the extreme values of vertical force and horizontal forces on the inner rail are increasing,the extreme values of vertical force and horizontal forces on the outer rail are decreasing,the derailment coefficient is increasing,and the wheel load reduction decreases first and then increases.The superelevation state has little influence on the vertical acceleration of the side frame and the wheel set.