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为研究动车组通过小半径曲线的安全性,在某动车所和动车组走行线选取小半径曲线,采用Min Prof廓形仪对钢轨磨耗进行测试,并对CRH2C型和CRH380A型综合检测列车通过小半径曲线时的动力学性能进行测试分析。结果表明:小半径曲线外股钢轨主要发生侧磨,内股钢轨主要发生轨道垂磨,曲线不同断面处的钢轨侧磨量差异较大,建议线路养护维修时重点考虑对缓和曲线与圆曲线过渡处采取润滑等减磨措施;对于动车组低速通过小半径曲线的准静态情况,建议脱轨系数限值取为1.0,在通过半径300 m曲线时适当限速;导向轮的脱轨系数明显大于从动轮,且曲线半径越小导向轮脱轨系数越大,导向轮与从动轮脱轨系数相差越大,导向轮的轮重减载率却明显小于从动轮,因此,除了应关注导向轮的脱轨系数外,还应重点关注从动轮的轮重减载率,防止动车组脱轨。
In order to study the safety of EMU passing through a small radius curve, a small radius curve is selected on the line of EMU and EMU, the rail abrasion test is conducted by Min Prof profiler, and the CRH2C and CRH380A integrated test train are passed through small Radial curve when the dynamic performance test analysis. The results show that the outer rail with small radius curve is mainly worn sideways, the inner rail with rail perpendicular to the rail, and the rail side with different cross section has a great difference in the amount of rail side wear. It is suggested that the transition between the curve and the circular curve should be considered in the line maintenance For the quasi-static condition that the EMU passes through the small radius curve at low speed, it is suggested that the limit of derailment coefficient should be taken as 1.0, and the speed limit should be properly adopted when passing through the curve with a radius of 300 m. The derailment coefficient of the guide wheel is obviously larger than that of the driven wheel, And the smaller the radius of the curve the greater the derailment coefficient of the guide wheel, the greater the difference between the derailment coefficient of the guide wheel and the driven wheel, the wheel load deloading rate of the guide wheel is obviously smaller than the driven wheel, therefore, besides paying attention to the derailment coefficient of the guide wheel Attention should be paid to the wheel loading and unloading rate of the driven wheel to prevent the EMU from derailment.