Coupling Fault Feature Extraction Method Based on Bivariate Empirical Mode Decomposition and Full Spectrum for Rotating Machinery

Table 1

The characteristics of different fault feature extraction method.

Method	Characteristic
WT	The choice problem for basis functions exists and the different vibration will show the characteristics of different waveforms.
EMD	It lacks rigorous theoretical basis and there is a serious phenomenon of modal aliasing in the decomposition process.
VMD	It solves the problem of mode mixing in EMD, but there are parameter optimization problems in VMD.
BEMD	It can detect synchronous features contained in the two-dimensional signal and comprehensively extract the information of fault signal.