舶用ディーゼル機関とメカトロニクスの信頼性・安全性評価

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  • ハクヨウ ディーゼル キカン ト メカトロニクス ノ シンライセイ アンゼンセ

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Abstract

The evaluation indices of the reliability and safety are extremely important for user and producer of ship industry.<BR>The reliability indices can give a range of some concrete desired values that satisfies with economic dfficiency and continuous running ability. Especially the safety index provides an economical running guidance.<BR>If the above evaluation indices can set up, some important guidelines can give to both the users and producers.<BR>On the other hand, a reliable improvement goes on a marine diesel engine and a mechatronics, and safety also is tending upward.<BR>However, it is difficult to say that reliable improvements of total systems are going up.<BR>According to a great number of the field data that collected from Mo Diesel Ship (131 rears-vessel), the reliability and safety in a ship evaluation during 1983-88 changed as follows.<BR>1. The total manning index MI, which means a maintainability, of 1000 hours, and also failure rate per 1000 hrs times man hour per case, decreased to about 60% within 6 years with respect to a total engine system.<BR>2. MI in a general failure and heavy ones decreased from 73 to 43 and from 19 to 11 individually for the total system.<BR>3. MI in both failures of two subsystems of of main engine and auxiliary machine failures occupied a half of all and each MI decreased to 66% in 6 years.<BR>The availability that is picked up as the index of safety, has been decreasing as the average number of operator decreases since the second surveyed period in 1984-85.<BR>The unavailability is deteriorating with 0.13-0.18% conversely, although 0.09% are indicated in 1985.

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