针对地铁车辆轴箱轴承寿命的二维计算方法

地铁车辆的载荷线路工况复杂多变,而传统轴箱轴承计算方法在计算轴承寿命时仅以定值载荷描述车辆的载荷工况,采用单一的冲击载荷系数修正车辆运行线路工况对轴承寿命的影响,无法反映出轴承使用工况的复杂性,导致计算出的轴承寿命与实际偏差较大。为此,提出了基于车辆载荷工况和线路工况的二维寿命计算方法,将轴承寿命表达为载荷和线路工况及其相应概率的函数,从而确保所得的轴承寿命值与实际值更加接近。根据某地铁线路实际运行工况,利用二维寿命计算方法计算出轴承疲劳寿命为1.596 Mkm,而相比采用传统轴承寿命计算方法计算出轴承疲劳寿命为3.652 Mkm,前者比后者下降了56.3%。

Two-dimensional Calculation Method for the Life of Metro Axle Box Bearing

The load and line condition of metro vehicle operation is complex and the traditional calculation methodfor the life of the axle box bearing,which describes the loading conditions of the vehicle only by the constant loadvalue and uses a single impact load factor to modify the effect on bearing life by the vehicle operation circuit condi-tions,cannot describe the complexity of working condition of the bearing and leads to large deviations between thecalculated bearing life and the actual life.Therefore,this paper puts forward the two-dimensional calculationmethod for the bearing life based on the vehicle load and line working condition,which expresses the bearing lifeas a function of load,line working conditions and the corresponding probability,and ensure that the bearing life ob-tained is closer to the actual life.According to the actual operating conditions of a subway line,the bearing fatiguelife obtained by the two-dimensional calculation method is1.596 Mkm.and the fatigue bearing Life calculated bythe traditional calculation method is 3.652 Mkm.The former is 56.3% lower than the latter.