齿轮磨损和接触疲劳竞争失效可靠性模型

Gear Wear and Contact Fatigue Competitive Failure Model

为了计算齿轮可靠度,针对磨损失效和疲劳失效2种常见的失效方式,分别建立了失效概率模型,在此基础上计算出可靠度,并考虑了服从泊松过程的冲击对磨损和接触应力的作用。磨损采用累积磨损的形式,建立了磨损-磨损阈值干涉模型。接触疲劳失效考虑随机强度退化,建立了动态强度-应力干涉模型。以某矿用挖掘机提升减速器中的齿轮为研究对象进行可靠性分析,对模型和方法进行验证,得到了考虑冲击作用的2种失效模式竞争的齿轮可靠度计算结果,分析了不同冲击参数下可靠度值。结果表明,模型对于估计寿命、材料选取等工程问题有一定的参考价值。

In order to calculate gear reliability,the failure probability models is established aiming at the two common failure modes of wear failure and fatigue failure,respectively.The reliability is calculated based on the results of the failure probability.The effects of the shocks following the Poisson process on wear and contact stress are considered.The wear-wear threshold interference model is established in the form of cumulative wear.Considering random strength degradation,the dynamic strength-stress interference model is established.With a numerical example for gears in the reducer,the reliability analysis is conducted.Verified by this numerical exam-ple,the gear reliability results of the two failure modes considering the shock are obtained.Additionally,reliabil-ity values under different shock parameters are analyzed.The results show that the model can provide specific guidance to life estimation,material selection and other engineering issues.