| Summary: | 碩士 === 國立成功大學 === 工程管理碩士在職專班 === 102 === This thesis is aimed to study the vibration anomaly of a free turbine engine T53-A-13B, and to explore the probability of each relevant factor that causes failure or malfunction during engine operations. It is believed that the occurrence of each failure event is not always from one single phenomenon. In this paper, many of the anomalistic phenomena are collected and gradually classified by its level from a chain of complex system. The fishbone diagram is made for the preliminary causal analysis and then converted into the characteristic system figure for the consideration to link each relevant component. With systematic operation, the characteristic system figure proofs the possible cause list. Finally, the tree structure from Fault Tree Analysis (FTA) finds out the interaction of each factor causing each event. However, the probability of each factor to each failure is not all the same.
In order to understand the lifecycle that various factors cause failures, the method of Analytic Hierarchy Process (AHP) is used in this thesis. Gradually leveling the failure factors by tree figure and interviewing the experts of relevant field helps evaluate the relative weight of various factors. Then, the weights come out from the software of Expert Choice are right the relative probability of failure occurrence, which provides the relative basis and countermeasure to the decision maker. The 4 factors that rate over 60% among the total weights shall be especially prevented and cautioned for the good of improvement.
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