(ABSTRACT) This research models the behavior of a multi-task system with respect to time. The type of multi-task system considered here is one in which not all system components are required to perform each task. Each component may, however, be used for more than one task. Also, it is possible that some of the components may be required for every task that the system performs. The components th...

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Navy has made a huge applying of preventive maintenance that has been recognized as the greatest source of costs. Scheduled overhaul is the most expensive. Revising preventive maintenance and selecting maintenance concepts according to a new algorithm should result into lowering those costs and at the same time maintaining function safety and system readiness. A reversible FMEA analysis coupled...

This paper deals with the problem of scheduling imperfect preventive maintenance (PM) of some equipment. It uses a model due to Kijima in which each application of PM reduces the equipment's e ective age (but without making it as good as new). The approach presented here involves minimizing a performance function which allows for the costs of minimal repair and eventual system replacement as we...

Maintenance costs, as defined by normal plant accounting procedures, are normally a major portion of the total operating costs in most plants. Traditional maintenance costs (i.e. labor and material) in the U. S. have escalated at a tremendous rate over the past 10 years. In 1981, domestic plants spent more than $600 Billion to maintain their critical plant systems. By 1991, the costs had increa...