Combined Failure Diagnosis of Slewing Bearings Based on MCKD-CEEMD-ApEn

Table 4

Data collection dates of the 150 segments.

Stages	1	2	3	4	5	6	7	8	9	Notes
(A)	150506	150625	150906	151015	151120	160122	160315	160420	160604	Dates
	3	3	2	3	3	3	2	3	3	Segments^1
	2	3	3	3	3	2	3	3	3	Segments^2
(B)	160702	160915	161025	161210	170222	170411	170522	170618	-	Dates
	2	3	3	4	4	3	3	3	-	Segments^1
	2	2	4	4	4	4	3	2	-	Segments^2
(C)	170920	171026	171110	171228	-	-	-	-	-	Dates
	6	6	6	7	-	-	-	-	-	Segments^1
	5	7	8	5	-	-	-	-	-	Segments^2

segments for feature extraction; segments for condition classification.