Acoustic Fault Diagnosis of Rotor Bearing System

Table 4

Recognition result of acoustic signals of rotor-bearing system with time domain statistical characteristics and K-nearest neighboring classifier.

Type of acoustic signals	EF (%)
	Number of K	1	3	5
Normal		90	90	90
Faulty inner ring		70	70	69
Faulty outer ring		50	51	52
Faulty rolling element		78	77	75
Rubbing		98	96	95