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Modelling Ship Operational Reliability over a Mission under Regular Inspections

A. H. Christer and S. K. Lee
The Journal of the Operational Research Society
Vol. 48, No. 7 (Jul., 1997), pp. 688-699
DOI: 10.2307/3010058
Stable URL: http://www.jstor.org/stable/3010058
Page Count: 12
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Modelling Ship Operational Reliability over a Mission under Regular Inspections
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Abstract

A ship is required to operate for a fixed mission period. Should a critical item of equipment fail at sea, the ship is subject to a costly event with potentially high risk to ship and crew. Given warning of a pending defect, the ship can try to return to port under its own power and thus attempt to avoid an at sea failure. Defects which lead to a failure are detected by inspection, and the task is to select the appropriate frequency of inspection to balance the number of occasions that a ship fails at sea and the number of preventive inspection based returns to port during a mission to correct a defect. The modelling entails using the delay time concept. Expressions are established for the expected number of preventive and failure returns over a mission, and an example given of a cost based balance to select an optimal inspection period. Although addressing ship reliability, the model has relevance to the mission reliability of any repairable equipment with remote main repair facilities.

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