Fault Frequency Identification of Rolling Bearing Using Reinforced Ensemble Local Mean Decomposition

Table 3

Performance comparisons under strong background noise by decreasing SNR to 1/5 of the original data from CWRU dataset.

Fault	Speed	Fault frequency	Rule of thumb			LMD + FSK			ELMD + FSK			Reinforced ELMD + FSK (proposed)
			CFF (Hz)	Error (%)	AFF	CFF (Hz)	Error (%)	AFF	CFF (Hz)	Error (%)	AFF	CFF (Hz)	Error (%)	AFF
Inner	1730	156.03	181.60	16.39	0.10	210.94	35.19	0.24	181.60	16.39	0.12	158.17	1.37	102.80
	1750	157.84	249.00	57.75	0.11	219.73	39.21	0.23	249.00	36.61	0.13	160.43	1.64	31.72
	1772	159.82	360.40	125.50	0.10	219.94	31.99	0.24	166.69	4.29	0.11	166.69	4.29	112.20
	1797	162.08	219.70	26.23	0.10	199.22	22.91	0.22	194.88	20.24	0.09	161.10	0.61	117.40
Outer	1730	103.47	260.70	135.55	0.03	260.70	160.31	0.03	284.20	174.67	0.04	99.61	3.73	19.50
	1750	104.66	149.40	42.75	0.07	187.50	79.15	0.21	105.50	0.80	0.03	105.50	0.80	8.50
	1772	105.98	184.60	74.18	0.03	199.22	87.98	0.20	184.60	74.18	0.03	108.40	2.28	8.10
	1797	107.47	351.60	227.16	0.04	134.76	25.39	0.22	87.89	18.22	0.04	102.50	4.62	13.81

CFF denotes the calculated fault frequency. AFF denotes the amplitude at fault frequency.