where CM(t) expresses the sum of all costs connected with
execution of subsystem preventive maintenance during the
operating time t. Material, wage and support equipment costs
connected with maintenance execution are included.
The presented optimization model is based on the assumption
that preventive maintenance is carried out in accordance with
a schedule and consists in execution of periodic stated
maintenance actions. The extent of individual preventive
maintenance actions does not substantially vary with operating
time, thus the average unit cost for preventive maintenance
can be considered constant:
(as per itinerary attach)
(as in attached )