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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 IC1C2C3C4C5
Fault typeHealthRootMissingChippedSurface
Task IID1D2D3D4 
Fault severityHealthSlightMediumHeavy 
Task IIIE1E2E3E4E5
Speed regulator (Hz)< 55‒1515‒2525‒35> 35
Task IVF1F2F3F4F5
Torque regulator (N·m)< 1.831.83‒5.495.49‒9.149.14‒12.80> 12.80