538
and Demirel (2017). The subsystems give an alert in the model after the percentile proportion
of its assigned random lifetime, i.e. threshold values, is passed over in the active simulation time.
3.2 Simulation results for the three shovels operating independently
As discussed previously, the simulation simultaneously checks the corrective, preventive, and
opportunistic maintenance conditions of subsystems, and makes an evaluation on their repairing and the future operating performances if any maintenance is decided in single or multiple
subsystem. In case that a subsystem is detected not to need any preventive maintenance during
an inspection, a regular inspection is performed. This regular inspection turns subsystem into
as bad as old condition. It means that failure probability just before and after inspection for that
subsystem will be equal to each other for that subsystem. Figures 2 and 3 illustrate the sample
views of the monitoring module that reveals the comparative conditions of shovel subsystems
during inspection and working hours, respectively. Figure 2 shows that subsystems in yellow are
having a preventive maintenance in inspection since they are in a wear-out period, and will turn
to a failure if not interfered. As seen in Figure 3, corrective maintenance for Shovel-1 SHE gives
an opportunity for proactive maintenance of SHD in a deterioration period.
The algorithm also allows understanding the effect of time between inspections, i.e. inspection interval, to corrective maintenance profile of the system. It should be noticed that
Figure 2. Maintenance behavior of subsystems during inspection hours.
Figure 3. Maintenance behavior of subsystems during working hours.
Simulation Time = Inspection Time
SHOVEL I
SHOVEL2
SHOVEL3
Action
Action
Action
PM
RI
RI
RI
RI
PM
RI
PM
RI
RI
RI
RI
PM
RI
PM
RI
PM
RI
Shovel
STOP
STOP
STOP
Condition
. :Fail . : Wear-out . : Good
Simulation Time = Expected Working Hour
SHOVEL!
SHOVEL2
SHOVEL3
Action
Action
Action
Hold
Work
Work
Hold
Work
Work
OM
Work
Work
CM
Work
Work
Hold
Work
Work
Hold
Work
Work
Shovel
STOP
WORK
WORK
Condition
. :Fail . : Wear-out . :Good
and Demirel (2017). The subsystems give an alert in the model after the percentile proportion
of its assigned random lifetime, i.e. threshold values, is passed over in the active simulation time.
3.2 Simulation results for the three shovels operating independently
As discussed previously, the simulation simultaneously checks the corrective, preventive, and
opportunistic maintenance conditions of subsystems, and makes an evaluation on their repairing and the future operating performances if any maintenance is decided in single or multiple
subsystem. In case that a subsystem is detected not to need any preventive maintenance during
an inspection, a regular inspection is performed. This regular inspection turns subsystem into
as bad as old condition. It means that failure probability just before and after inspection for that
subsystem will be equal to each other for that subsystem. Figures 2 and 3 illustrate the sample
views of the monitoring module that reveals the comparative conditions of shovel subsystems
during inspection and working hours, respectively. Figure 2 shows that subsystems in yellow are
having a preventive maintenance in inspection since they are in a wear-out period, and will turn
to a failure if not interfered. As seen in Figure 3, corrective maintenance for Shovel-1 SHE gives
an opportunity for proactive maintenance of SHD in a deterioration period.
The algorithm also allows understanding the effect of time between inspections, i.e. inspection interval, to corrective maintenance profile of the system. It should be noticed that
Figure 2. Maintenance behavior of subsystems during inspection hours.
Figure 3. Maintenance behavior of subsystems during working hours.
Simulation Time = Inspection Time
SHOVEL I
SHOVEL2
SHOVEL3
Action
Action
Action
PM
RI
RI
RI
RI
PM
RI
PM
RI
RI
RI
RI
PM
RI
PM
RI
PM
RI
Shovel
STOP
STOP
STOP
Condition
. :Fail . : Wear-out . : Good
Simulation Time = Expected Working Hour
SHOVEL!
SHOVEL2
SHOVEL3
Action
Action
Action
Hold
Work
Work
Hold
Work
Work
OM
Work
Work
CM
Work
Work
Hold
Work
Work
Hold
Work
Work
Shovel
STOP
WORK
WORK
Condition
. :Fail . : Wear-out . :Good