基于两参数威布尔分布理论进行机车车轮轮芯失效个数的威布尔概率密度函数和威布尔分布函数拟合，包括南昌，上海，兰州，乌鲁木齐和总体轮芯失效统计-Weibull probability density function of the Weibull distribution function and locomotive wheel core based on the theory of two-parameter Weibull distribution fitting failure number, including Nanchang, Shanghai, Lanzhou, Urumqi and overall wheel core failure statistics