抄録
In the former paper, we discussed the characteristics of the optimal maintenance policies, that is, Policy I and Policy II proposed by R. Barlow and L. Hunter through the numerical analysis.
In this case, as a failure distribution, we adopted the Weibull distribution, where the shape parameter β was limited to be greater than one. Because in general, the mechanical systems have the characteristics that failure rate is increasing with operating time. It became clear that the new results obtained were very useful for choosing the optimal maintenance policy and for determining the optimal maintenance interval.
In this paper, more we introduce the relations between the availability and the maintenance cost per unit time and then give the procedure of obtaining the optimal policy, the optimal maintenance interval and the maintenance cost per unit time. We illustrate the numerical examples by using the field data on marine maintenance in order to show the usefulness of the procedure obtained newly.
