A Fast Diagnosis Method of Escalator Reversal Faults Based on Dynamic Information and Multiattribute Decision-Making

Table 3

Ranking table of failure probability, search cost, and influence degree.

Event symbol	Bottom event	Failure probability P	Search cost M	Influence degree I
X1	Overload	0.2	5	4
X2	Damaged gearbox bearings	0.1	60	1
X3	Gear meshing failure of gearbox	0.15	55	1
X4	Loose host position	0.1	10	2
X5	The brake is not working properly	0.3	50	6
X6	Damaged rung chain	0.05	40	1
X7	Deformation and damage of drive chain	0.1	20	2
X8	Reversal protection device fails	0.15	30	1
X9	Insufficient grid voltage	0.1	15	2
X10	Motor power is too small	0.2	35	1