基于EEMD的行星齿轮箱齿轮裂纹损伤定位

针对行星齿轮式变速箱的齿轮裂纹损伤难以提取特征频率和定位的问题,提出基于总体平均经验模式分解(ensemble empirical mode decomposition,简称EEMD)的齿轮局部损伤频率解调分析方法。该方法在建立的齿轮局部损伤振动信号模型的基础上,分别对太阳轮、齿圈、行星轮的裂纹损伤信号进行EEMD分解和频率解调分析,通过频谱图提取齿轮的局部损伤特征频率,从而识别变速箱中裂纹损伤齿轮的位置。综合仿真分析和试验结果表明,基于EEMD的齿轮局部损伤频率解调分析方法可以有效地提取太阳轮、齿圈和行星轮的裂纹损伤特征频率,实现行星齿轮式变速箱中齿轮裂纹损伤的定位。

Gear Crack Damage Localization of the Planetary Gearbox Based on Ensemble Empirical Mode Decomposition

In order to solve the problem that it is difficult to extract the characteristic frequency and identify the location of the gear crack damage in planetary gearboxes, a gear local damage diagnosis method based on ensemble empirical mode decomposition (EEMD) and frequency demodulation analysis is put forward. Based on the vibration signal model of typical gear local damages, the method can process vibration signals of the sun, ring and planet gear with crack damage by EEMD and frequency demodulation analysis. The local damage characteristic frequency of the gear is extracted from the frequency spectrum, and the location of the gear with crack damage in the gearbox is identified. Simulation analysis and experimental results show that the method based on EEMD and frequency demodulation analysis can effectively extract the characteristic frequency from the sun, ring and planet gear with crack damage. Besides, the damage localization of the gear with crack damage in the planetary gearbox is completed.