Rolling Element Bearing Performance Degradation Assessment Using Variational Mode Decomposition and Gath-Geva Clustering Time Series Segmentation

Table 1

The optimized parameter α of each K mode decomposition.

	The optimized parameter α	Criterion η
2	1382	0.9502
3	1044	1.1704
4	9534	0.9302
5	9651	1.2129
6	9736	1.5024
7	1423	1.5122
8	2321	1.6714
9	1537	2.2026
10	9286	1.5204