Table 1 Description of states
States | Description |
|---|---|
\({S}_{0}\) | \({S}_{0}{ }\) is the ideal state in which the two subsystems and their respective units work perfectly |
\({S}_{1}\) | In this state, the first unit of subsystem 1 has failed, but the other two units in subsystem 2 are working perfectly. The system is working |
\({S}_{2}\) | In this state, one unit has previously failed in subsystem 1, and the first unit from subsystem 2 unexpectedly failed, but the other units from both subsystems 1 and 2 are fully operational. The system is now operational |
\({S}_{3}\) | This state denotes total failure as a result of the failure of both units in subsystem 1 |
\({S}_{4}\) | This state represents total failure as a result of the failure of both subsystem 2 units |
\({S}_{5}\) | This state denotes complete failure due to human operator error |
\({S}_{6}\) | This state also represents complete failure due to robot operator error |
\({S}_{7}\) | This state is a complete failure due to common cause failure |