Fault Feature Extraction Method of Rolling Bearing Based on IAFD and TKEO

Table 6

Operation time comparison.

Category	SP + WOA	PRD	SNR
Outer ring failure running time (s)	0.7964	1.3032	1.3032
Inner ring failure running time (s)	0.9964	1.5607	1.6015

Bold values emphasize that the calculation time of our method is lower.