Bearing fault diagnosis method based on adaptive optimization demodulation frequency band selection

The invention discloses a bearing fault diagnosis method based on adaptive optimization demodulation frequency band selection. The method comprises the following steps: calculating an instantaneous angular velocity IASi by adopting a forward difference method; a double-variable spectrogram composed of a cyclic order and a spectral order is obtained through a cyclic spectrum correlation algorithm, cyclic spectrum coherence CSCoh is obtained through normalization processing, and improved envelope spectrums IES of all sub-bands are obtained through integration; dividing each sub-band improved envelope spectrum IES, calculating a reweighted kurtosis value RK of each sub-band improved envelope spectrum IES and taking the reweighted kurtosis value RK as an RK value of a corresponding sub-band, merging and reconstructing the sub-bands, selecting the merged sub-band corresponding to the maximum RK value after merging and reconstruction as an optimized demodulation frequency band, performing envelope ...