定期保全間隔に乱れが存在する場合のMTBF等の特性について

Abstract

The periodic maintenance method is well known as one of the best methods in the preventive maintenance. Its properties in the strictly periodic maintenance have been studied theoretically, but the case where there is randomness in the periodic maintenance interval has never been investigated so far. On the other hand, the field maintenance data have suggested us difficulties of keeping the interval of periodic maintenance strictly.Therefore, this paper deals with the characteristics of the MTBF (Mean Time Between Failures) under the periodic maintenance with random interval. First we choose a Weibull distribution as the reliability function of the items and next set up the maintenance model which exists the random interval in the periodic maintenance. Under these conditions, we investigate how the randomness of the maintenance interval effects on the MTBF of the items from the theoretical viewpoints. Finally, we show the usefulness on the basis of results obtained here.