This article proposes a usage of rough collection theory by optimizing the BP nerve network model method, and will apply the optimized network model in the rolling bearing breakdown diagnosis.
提出了使用粗糙集理论优化BP神经网络模型方法，并将优化后的网络模型应用于滚动轴承的故障诊断中。
The fatigue life for hybrid rolling ball bearing is researched on the base of its breakdown mechanism and fatigue life of steel bearings. Its fatigue life formula is given.
根据混合轴承的破坏机理，在钢轴承使用寿命公式的基础上，对混合轴承的使用寿命进行探讨，推导出它的寿命公式。
The fatigue life for hybrid rolling ball bearing is researched on the base of its breakdown mechanism and fatigue life of steel bearings. Its fatigue life formula is given.
根据混合轴承的破坏机理，在钢轴承使用寿命公式的基础上，对混合轴承的使用寿命进行探讨，推导出它的寿命公式。
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