Open Access

Table 1

Fault tree nodes.

Symbol Event Symbol Event
T Braking system failure X3 Brake disc overheating
A1 Basic braking system failure X4 Brake disc pollution
A2 Control system failure X5 Excessive swing of brake disc
B1 Transmission unit failure X6 Improper brake installation
B2 Execution unit failure X7 Spring fatigue
B3 Output device failure X8 Spring break
B4 PLC failure X9 Motor controller failure
B5 Acquisition device failure X10 Motor failure
C1 Brake tile friction coefficient small X11 PLC memory card failure
C2 Brake shoe wear excessive X12 PLC hardware failure
C3 Disc spring failure X13 Displacement sensor failure
X1 Ball screw damaged X14 Pressure sensor failure
X2 Planetary gear reducer failure X15 Encoder failure

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