基于AVME-OMOMEDA的滚动轴承复合故障诊断

Compound fault diagnosis of rolling bearing based on AVME-OMOMEDA

  • 摘要: 传统算法难以有效分离提取共振频带重叠的轴承复合故障特征,本文提出一种结合自适应变分模态提取(Adaptive variational mode extraction,AVME)与优化多点最优最小熵反褶积(Optimized multipoint optimal minimum entropy deconvolution adjusted,OMOMEDA)的自适应滚动轴承复合故障特征分离提取方法。利用S变换谱自相关能量谱确定VME参数中心频率的初始值,提取出与故障相关的期望模态;再将期望模态进行线性叠加重构原信号,实现对信号的降噪;最后利用OMOMEDA处理重构信号分离提取周期性的脉冲信号,结合包络解调获取故障特征频率。仿真信号和试验信号验证了该方法能有效分离提取共振频带重叠的轴承复合故障特征,并与VMD-MCKD等其他四种已有算法进行比较,证明了所提方法的优越性。

     

    Abstract: Traditional algorithms are difficult to effectively separate and extract the composite fault features of bearings with overlapping resonance bands, an adaptive rolling bearing composite fault feature separation and extraction method combining adaptive variational mode extraction (AVME) and optimized multi-point optimal minimum entropy deconvolution adjusted (OMOMEDA) is proposed in this paper. The initial value of the center frequency of the VME parameter is determined by using the autocorrelation energy spectrum of S transform spectrum, and the desired modes related to the fault are extracted. Then the desired modes are linearly superimposed to reconstruct the original signal to realize the noise reduction of the signal. Finally, the reconstructed signal is used to separate and extract the periodic impulse signals by OMOMEDA processing, which is combined with the envelope demodulation to obtain the characteristic frequency of the fault. The simulation and test signals verify that the method can effectively separate and extract the composite fault features of bearings with overlapping resonance bands. And compared with four other existing algorithms such as VMD-MCKD, the superiority of the proposed method is demonstrated.

     

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