| Summary: | 碩士 === 國立交通大學 === 工學院碩士在職專班精密與自動化工程學程 === 94 === The purpose of this paper is to study the failure of the critical components of the hybrid card reader using the failure mode and effects analysis (FMEA). In the failure analysis, three different failure criteria are used to study the fatigue life reliability of the components. In the analysis process, after reviewing the operational conditions, functions and mechanism characteristics of the hybrid card reader, the operational procedure and reliability related diagrams are constructed. The FMEA is used to analyze the components’ failure effects to study how they can affect the reliability of the system and determine which components are easier to fail. The fatigue life reliabilities of the components are computed by using the three different failure criteria, namely, stress-strength criterion, safety factor, and Goodman failure criterion. The limit state equations derived from the corresponding failure criteria are used in the reliability analysis of the components. The first order second moment method is used to calculate the reliability index β and study how the component parameters’ variances affect the fatigue life reliability of the component. The results obtained in this study can identify the failure criterion which produces the lowest reliability. In the sensitivity analysis, the effects of the component’s design parameters on fatigue reliability are investigated. The results can help identify the key factors important to the design, manufacturing and inspection of components with higher reliability and lower cost.
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