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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