| Summary: | 碩士 === 朝陽科技大學 === 工業工程與管理系碩士班 === 97 === Abstract
There are few papers in the preventive maintenances area focusing on the finite time span issue. The literature has shown that most researchers are devoted to studying the maintenance problems in the infinite time span which assume that the replaced system in each replacement cycle has the same conditions and costs. However, the useful operating life for most systems is finite in real world. Moreover, the conditions of a new equipment, such as failure process, efficiency, cost, maintenance, and etc., may be very different from the conditions of the equipment of the previous replacement cycle. It turns out that the hypothesis of infinite time span for the preventive maintenances problem does not suitable for the practical situations.
Therefore, the purpose of this research is to develop an optimal periodic and sequential preventive maintenance policy with failure rate reduction in a finite time span under a given warranty period and a re-sale value by minimizing the expected total maintenance cost. In this research, the algorithms and theorems for searching the optimal solutions are presented. Examples with Weibull failure cases are given and the sensitivity analysis of optimal solution is also compared and provided.
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