Abstract: In view of the abnormal shoulder wear-one side of the running wheels of straddle type monorail vehicles, an effective finite element model of the running wheel tires of the monorail vehicle was established, and the shoulder wear-one side was characterized by the sum of the friction work and the skewness value of the friction work of the running wheel tire. The influence rule of the running wheel tire parameters of the monorail vehicle on the shoulder wear-one side of the running wheels was studied, and the analytical formula for the function of the running wheel tire parameters, the total friction work and the friction work skewness value was found by the symbolic regression analysis method. The results show that when the vehicle speed is 36 km/h, the wear and shoulder wear-one side can be minimized. Appropriately reducing the vertical force, side deflection angle and roll angle of the running wheel tire can effectively reduce the total friction work and friction work skewness value of the running wheel tire and improve the shoulder wear-one side of the running wheel tire. Moreover, the analytical formula of the fitted function has high accuracy, which can be used as the analytical formula for the shoulder wear-one side of the running wheel tire and the running wheel tire parameters of the monorail vehicle.

Key words: vehicle engineering; monorail vehicle; running wheel; shoulder wear-one side; symbolic regression

摘要： 针对跨座式单轨车辆走行轮异常偏磨损现象，建立了有效的单轨车辆走行轮胎有限元模型，并以走行轮胎摩擦功总和、摩擦功偏度值来表征偏磨损，研究了单轨车辆走行轮胎参数对走行轮偏磨损的影响规律，采用符号回归分析方法找到了走行轮胎参数与摩擦功总和、摩擦功偏度值的函数解析式。结果表明:当车速为36 km/h时可以使磨损和偏磨损最小；适当减小走行轮胎垂向力、侧偏角和侧倾角可以有效的减小走行轮胎的摩擦功总和、摩擦功偏度值，改善走行轮胎偏磨损状况。

关键词: 车辆工程；单轨车辆；走行轮；偏磨损；符号回归