Modeling the preventative maintenance policy with periodic inspections of the continuously degrading system

In modeling a maintenance with inspections, failure models are required. In this paper, a preventive maintenance model with periodic inspections of a continuously degrading system is described with a reaction rate model and a cumulative degradation model, both of which are examples of the family of failure models. To inspect all the units in the system is often impossible because of a technical and/or an economic reason(s). Therefore the model consists of two subsystems; an inspected subsystem (IS) and a non-inspected subsystem(NS). The degradation from IS to NS is considered. Finally the model is analyzed with some numerical examples. [In Japanese.]