School of Mechanical Engineering, Southwest Jiaotong University, North 1st section, 2nd Ring Road, Chengdu City, 610031, China.
Sci Rep. 2022 Jul 8;12(1):11668. doi: 10.1038/s41598-022-13712-1.
Rail grinding becomes an important maintenance means of railway. Dynamic behavior of rail grinder is due to vehicle-track coupling relationship based on mechanical-electric-hydraulic coupling. Curve negotiating ability of rail grinder through modeling and simulation based on one-side grinding is studied in this paper. Simulation result is shown below. In typical case, rail grinding will increase transverse displacement of wheelsets, derailment coefficient of wheels in front wheelset, and unloading rate of wheelsets. In other case, increase of rail irregularity amplitude and decrease of its wavelength, which aggravates fluctuation of grinding power, has little influence on curve negotiating ability. When line radius curvature decreases, compared to state without grinding, decline to curve negotiating ability of state with grinding is more significantly. When number of grinding wheels at work increases, lateral displacement of wheelset, derailment coefficient of wheels in front wheelset, and unloading ratio of wheelsets increase. In short, rail grinding will significantly deteriorate curve negotiating ability of rail grinder.
钢轨打磨成为铁路的重要养护手段。钢轨打磨车的动态行为是基于机-电-液耦合的车辆-轨道耦合关系。本文通过单侧打磨建模与仿真研究了钢轨打磨车的曲线通过能力。仿真结果如下。在典型情况下，钢轨打磨会增加轮对的横向位移、前轮对车轮的脱轨系数和轮对的卸载率。在另一种情况下，增加钢轨不平整幅值并降低其波长，这会加剧磨削功率的波动，但对曲线通过能力影响较小。当线路半径曲率减小时，与未打磨状态相比，打磨状态的曲线通过能力下降更为明显。当工作的打磨砂轮数量增加时，轮对的横向位移、前轮对车轮的脱轨系数和轮对的卸载率都会增加。总之，钢轨打磨会显著恶化钢轨打磨车的曲线通过能力。
