舶用プラントの重故障領域における安全性評価―2

(時系列要素に保全要素を加味した確率的評価)

抄録

Dependability is a comprehensive terminology for describing factors affected by three perfomances of reliability, maintainability, and supportability. For an improvement of total reliability, in the case of ship and her marine engine system, it would be more important to pay attention to the system reliability other than the component reliability. This means that not only the reliability but also the maintainability and supportability should be considered in order to improve the operational efficiency of the ship.
The hazard index is proposed by authors in this paper to evaluate the operational efficiency of the ship. Serious failure is defined as a malfunction caused by the operation trouble with a stoppage and/or slow down of main engine. The cases of serious failure per 1000 hours is the serious failure rate. The hazard index is defined as the result of multiplying the effect hour per case [min/case] by the serious failure rate [cases/1000 hrs] . In addition, the safety evaluation for ship's plant are made by using average failure rate, man-hour and repair rate mainly estimated by statistical failure data so far.
However, preventive and corrective maintenance are done by actual vessel, and the occurrence number of the trouble takes an influence in the running hours.
According to these relationship, it is necessary to evaluate by the average data in addition to the probability evaluation.
This paper presents the reliability analysis methods by the probability evaluation in consideration of maintenance factor with a time-series element on serious failure situations resulting with the statistical database.