A Novel Detrended Fluctuation Analysis Method for Gear Fault Diagnosis Based on Variational Mode Decomposition

Table 3

Classification results based on VMD-DFA and STS-DFA method in jackknife test.

Method	Normal	Scratched	Toothless	CPE	TRR
VMD-DFA	(80/80)	(78/80)	(78/80)	(80/80)	(316/320)
(Jack)	100%	97.5%	97.5%	100%	98.75%
STS-DFA	(77/80)	(71/80)	(64/80)	(80/80)	(292/320)
(Jack)	96.25%	88.75%	80%	100%	91.25%

CPE: circular pitch error; TRR: total recognition rate; VMD: variational mode decomposition; DFA: detrended fluctuation analysis; STS: small time scale; Jack: jackknife test.