Rapid Fault Diagnosis Method of Elevator System Based on Multiattribute Decision Making

Table 4

The ranking results of the static attributes.

ID	Bottom event	The ranking result
	Uneven grease lumps in the traction wheel groove	0.90110553
	The lubricating oil of guide rails solidifies	0.85725351
	The lubricating oil of motor bearings solidifies	0.70530025
	The guide rails and guide shoes are severely worn	0.58969769
	The anchor bolts of the traction machine are loose	0.57472079
	The fastening bolts of the reverse sheave frame are loose	0.56311343
	The bolts of guide rails brackets are loose	0.52062572
	Too much lubricating oil in the traction wheel groove causes slippage	0.50779374
	The tension of the wire ropes is uneven	0.50760147
	Overheating of the electric motor causes its lubricating oil to dilute	0.42542178
	The bearings of the reverse sheave are worn	0.39327756
	The guide rails are frozen	0.32921399
	The base of the traction machine is not flat	0.31247737
	Deviation occurs during installation at the joint of guide rails	0.22717022
	Deviation occurs during installation of guide rails and guide shoes	0.21817456