Application of FIFD-OMGD-1.5D Teager Energy to Extract Microfault Features of Rolling Bearing

Table 3

Fault feature frequency extracted by different methods and average relative error with different SNRs.

Fault feature Frequency (Hz)	SNR
Algorithm	−3	−5	−7	−9	−11	−13	−15	Average relative error
True	100	100	100	100	100	100	100
FIFD-OMGD (based on protrugram algorithm)	99.8	99.8	99.8	100.2	100.2	99.8	100.2	0.000200
FIFD-OMGD (based on fast kurtogram algorithm)	101	98.98	98.98	101	98.98	98.98	98.98	0.010143
CEEMDAN-OMGD	101	101	102.2	101	101.6	98.98	102	0.014029
FIFD-MCKD	100.1	100.1	101	98.6	107.3	111.8	89.4	0.046142