一种行星齿轮裂纹深度评估新特征及其应用

为了实现行星齿轮损伤程度的准确评估，保证行星齿轮损伤程度评估对于开展装备维修的指导作用，建立了行星轮系平移-扭转动力学模型，分析了行星轮系动力学仿真信号频谱幅值与裂纹程度的变化规律，提出了一种新的裂纹深度评估特征:故障频率及多倍频幅值累积量与啮合频率幅值之比（RCMFAM）.与典型的时域、频域特征比较，所提裂纹深度评估特征与裂纹损伤程度具有良好的关联性和较强的一致性.利用齿轮正常、裂纹50%和断齿三种状态的实验数据进行验证，结果表明，所得评估结果与实际裂纹深度基本一致，验证了所提特征的有效性. 

A New Crack Depth Evaluation Feature of Planetary Gear and Its Application

In order to accurately evaluate the damage degree of planetary normal and to improve the evaluation guidance capability for equipment maintenance, a translation-torsion dynamic model was established for planetary gear train. Analyzing the variation of spectrum amplitude and crack degree of planetary gear train in dynamic simulation signal, a new crack depth evaluation feature was proposed based on the Ratio of Cumulative amplitude of Multiple Fault frequency to Amplitude of Meshing frequency (RCMFAM). The results show that, compared with the typical time-domain and frequency-domain features, the proposed feature can offer a better correlation and strong consistency with the crack damage degree. In the validating experiments with normal, 50% crack damage and broken tooth gear, the evaluation results are basically consistent with the actual crack depth, verifying the effectiveness of the proposed features.