| Summary: | 碩士 === 國立成功大學 === 工業與資訊管理學系 === 104 === This study investigates the effects that the degree of the total degradation has on the occurrence frequency of random shocks based on the multiple dependent competing failure processes (MDCFP) to obtain the optimal preventive maintenance strategy. Research on preventive maintenance and multiple failure modes mostly assumed that the occurrence frequency of random shocks is independent of the degree of degradation. However, such an assumption is not practical in reality. This study uses a simulation method to generate the failure times and then adopts the generated failure times to obtain the optimal periodical inspection and preventive maintenance strategies. We also perform a sensitivity analysis by using the data of a micro-electro-mechanical system. The obtained results indicate that regarding to the periodical inspection, the low occurrence frequency of random shocks and inspection cost can effectively decrease the long-run maintenance cost. Moreover, with regard to the periodical preventive maintenance, the high soft failure threshold, low occurrence frequency of random shocks, and replacement cost can effectively reduce the long-run maintenance cost.
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