Composite Fault Diagnosis for Rotating Machinery of Large Units Based on Evidence Theory and Multi-Information Fusion

Table 3

Five dimensionless indexes of composite fault states.

Known conditions	Waveform index	Impulse index	Margin index	Peak index	Kurtosis index
Gear teeth missing and bearing outer ring wear	[1.2923 1.3821]	[4.0050 9.0449]	[4.9071 11.052]	[2.9801 6.6528]	[3.5016 6.7520]
Gear teeth missing and bearing inner ring wear	[1.2807 1.3674]	[3.7979 6.5451]	[4.6587 7.9822]	[2.8775 4.8803]	[3.3407 5.5130]
Gear teeth missing and bearing lack of ball bearings	[1.2846 1.3723]	[3.8535 6.5064]	[4.6707 8.0142]	[2.9499 4.8437]	[3.3148 5.7533]
Large and small gear teeth shortage	[1.2578 1.3216]	[3.5256 6.8609]	[4.1758 8.2560]	[2.8031 5.2850]	[2.9991 4.7708]
Large and small gear teeth missing and bearing outer ring wear	[1.2578 1.3241]	[3.6135 6.9309]	[4.3388 8.2902]	[2.8185 5.3520]	[3.2329 4.6734]
Large and small gear teeth missing and bearing inner ring wear	[1.2447 1.3254]	[3.3565 7.1678]	[4.0078 8.7199]	[2.6438 5.4380]	[2.9846 4.8813]