Application of Variational Mode Decomposition and Multiscale Permutation Entropy in Rolling Bearing Failure Analysis

Table 4

Comparison of different thresholds (K = 5).

	Center frequency (Hz)
Normal condition	106	1040	1289	2102	4888
Inner ring fault	608	1384	2745	3336	3636
Roller fault	576	1050	2867	3268	3428
Outer ring fault	644	1105	2836	3421	5183