It is difficult to complete the maintenance of a ship 100% perfectly.
In other words, it is difficult to return to the same condition as new
after maintenance. The repair shop’s technical skills and natural aging
are the reasons for this. Maintenance technology refers to this
phenomenon. Choi and Moon (2021) estimated the technical level of Naval
ship’s repair shop by Bayesian inference. On average, it was repaired at
a level of 74%. If maintenance is performed with 100 failures, 26
failures cannot be completely repaired and remain on the ship.
On the other hand, Oliva and sterman (2001) studied that the speed of a
person’s work varies by 75~125% depending on the
workload. Mechanics can perform maintenance faster when there is a lot
of work and more slowly when there is less work. The standard working
day for the Navy is 8 hours. When they are busy, they can perform 10
hours’ worth of maintenance (8*1.25). The disciplines were applied using
system dynamics.
The model in Fig. 7 includes disciplinary (schedule pressure) and
maintenance technology (Effective of maintenance). Although the scales
of all modules are different, building them into one model is not
different from the process of building a system dynamics model in
general.