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

Table 5

Scores of four attributes.

ID	Bottom event	Failure probability (%)	Search cost	Location time cost	Location-related score
	The lubricating oil of guide rails solidifies	2.6	3.62	5	5
	The lubricating oil of motor bearings solidifies	2.3	6.52	2	0.2
	The guide rails and guide shoes are severely worn	1.4	1	2	0.2
	The anchor bolts of the traction machine are loose	1.6	3.62	5	5
	The fastening bolts of the reverse sheave frame are loose	1.6	4.8	4	7
	The bolts of guide rails brackets are loose	1.3	2.84	2	0.1428
	Too much lubricating oil in the traction wheel groove causes slippage	1.4	3.62	5	5
	The tension of the wire rope is uneven	1.4	4.24	4	3
	Overheating of the electric motor causes its lubricating oil to dilute	1.3	6.52	2	0.2
	The bearings of the reverse sheave are worn	1.3	8.08	7	7
	The guide rails are frozen	0.2	1	2	0.2
	The base of the traction machine is not flat	0.8	3.62	5	5
	Deviation occurs during installation at the joint of guide rails	0.3	3.62	5	5
	Deviation occurs during installation of guide rails and guide shoes	0.2	3.62	5	5