STUDIES ON OPTIMUM CONDITION-MONITOR CYCLE TIME POLICIES WITH GENERALREPAIR RESULT

In this paper we consider that an equipment life is subjected to a gen eral distribution and its condition-monitor cycle time is T. No sooner is the failure monitored than the equipment is repaired. After being repaired, the equipment does not function as a new, but as one which h as been used for a period of time. Let Y indicate such a period of tim e, standing as a random variable. Hence, assuming the same repair cond itions at each repair, we get a Y distribution after each repair. Usin g the following method, E(X) = E(y)(E(x)(X \ Y)), we can obtain a mean condition-monitor cycle time and mean repair cost between two adjacen t maintenance intervals. Finally, considering an objective function wi th bound condition, and using Lagrange's method of multipliers, we obt ain an optimum condition-monitor cycle time T-, where the minimum tot al repairing cost is achieved.