针对某型动车组运营过程中出现的转向架蛇行失稳报警和车体低频晃动等问题，结合S1002CN型车轮踏面与实测钢轨打磨前和打磨后轨面的轮轨接触特征，将车轮踏面接触区分为踏面喉根圆接触区、常工作区和踏面端部接触区三部分，并对其外形进行改进设计（称为LMB_10型车轮踏面）。改进的LMB_10型车轮踏面保持工作区的轮轨接触关系，减小轮缘厚度并平缓轮缘根部，降低了由于高等效锥度带来的转向架蛇行失稳报警风险；同时增大踏面端部斜率，降低了由于低等效锥度带来的车体低频晃动风险。仿真分析和线路试验结果表明，改进的LMB_10型车轮踏面与标准CH60型轨面匹配的等效锥度降低至0.105，增大了轮轨间隙，与打磨前后轨面匹配适应性增强，改善了车辆的蛇行运动稳定性、运行平稳性和曲线通过性能。在线路运营考核中，改进的LMB_10型车轮踏面镟轮周期最长达39万公里，在整个运行过程中始终具有良好的动力学性能。
In terms of the issues of bogie hunting instability alarm and car body low-frequency sway for a high speed train in the operation period, a new wheel profile named type LMB_10 is designed based on the characteristics of wheel-rail contact between the wheel profile of type S1002CN and the actual measured rail profiles before and after grinding. During the design procedure, the wheel profile is divided into three sections, namely the wheel root area, working area and end area. With respect to the wheel profile of type S1002CN, the designed profile in the working area remains unchanged, while the root area is reduced in order to have a larger wheel-rail clearance. This helps to reduce the possibility of bogie hunting instability alarm due to high wheel-rail equivalent conicity. For the end area, the slope of the wheel tread is increased so that the risk of carbody low-frequency sway is reduced. The results of simulation and field test show that the contact between profile of type LMB_10 and rail profile of type CN60 has a low equivalent conicity of 0.105, and a large wheel-real clearance. It also has a good adaptability when matching with the rail profiles before and after grinding, and the hunting stability, ride comfort and curving performance of the vehicle system have been improved. In the actual operation assessment, the profile of type LMB_10 has a quite long running mileage up to 390,000 km before wheel tread reprofiling, and the vehicle system has always maintained good dynamic performance in the whole service period.
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