| Summary: | 碩士 === 國立成功大學 === 工業與資訊管理學系碩博士班 === 101 === A failure often occurs in a complex system due to deterioration or other external factors. For complex systems, two failure processes are often considered as Multiple Dependent Competing Failure Processes (MDCFP): catastrophic failure which are caused by a sudden stress from a random shock process, and soft failures which are caused jointly by continuous degradation and the additional damage due to the same shock process. Condition-based maintenance is carried out through monitoring system state to keep the system functioning in a good state. In this study, a condition-based maintenance policy is considered through monitoring the degrees of deterioration (e.g., material wear) . The expected total cost per unit time is minimized to determine the optimal maintenance threshold, and then the optimal non-periodic preventive maintenance schedules are derived. Numerical examples are given to demonstrate the effectiveness of the proposed model, and how the optimal condition-based maintenance policy can be applied to the complex system subject to MDCFP. A sensitivity analysis is performed and the discussion on the optimal policy are also presented. The proposed model provides decision makers with an effective method in determining the appropriate maintenance policy.
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