Chinese Journal of Mechanical Engineering

Table 3 Define levels in different tasks

From: A Fast Multi-tasking Solution: NMF-Theoretic Co-clustering for Gear Fault Diagnosis under Variable Working Conditions

Task I	C1	C2	C3	C4	C5
Fault type	Health	Root	Missing	Chipped	Surface
Task II	D1	D2	D3	D4
Fault severity	Health	Slight	Medium	Heavy
Task III	E1	E2	E3	E4	E5
Speed regulator (Hz)	< 5	5‒15	15‒25	25‒35	> 35
Task IV	F1	F2	F3	F4	F5
Torque regulator (N·m)	< 1.83	1.83‒5.49	5.49‒9.14	9.14‒12.80	> 12.80

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