两级载荷作用下城轨列车传动齿轮弯曲疲劳寿命预测

Bending Fatigue Life Prediction of Transmission Gear of Urban Rail Train under Two-stage Load

齿轮弯曲疲劳对列车安全运营具有重要影响。本文针对城轨列车载荷特点,建立一种适用于城轨列车的齿轮疲劳寿命预测模型。通过分析城轨列车实际运行过程的齿轮载荷特点,并结合主动齿轮累积受载频次,确定两级载荷大小,以两级应力比作为损伤参量,对城轨列车齿轮弯曲疲劳进行试验研究与寿命预测。研究结果表明:齿轮在两级载荷作用下疲劳寿命明显低于单一载荷作用下的疲劳寿命。通过将本文提出的疲劳寿命预测模型预测结果与试验数据进行对比发现,本文建立的疲劳寿命预测模型可以较为准确的预测齿轮的疲劳寿命。

Gear bending fatigue has an important impact on the safe operation of urban railway vehicles. According to the load characteristics of urban railway vehicles, this paper establishes a gear fatigue life prediction model suitable for urban railway vehicles. By analyzing the gear load characteristics of the actual operation condition of urban rail vehicles, and combining the cumulative load frequency of the driving gear, the two-stage load is determined;using the two-level stress ratio as the damage parameter, the bending fatigue test and life prediction of urban rail train gears are carried out. The research results show that the fatigue life of the gear under two-stage load is significantly lower than that under a single load. By comparing the prediction results of the fatigue life prediction model proposed in this paper with the test data, it is found that the fatigue life prediction model established in this paper can predict the bending fatigue life of gears more accurately.