Internet-Oriented Reliability Databases and Reliability Methods

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Results are classified into the following five categories :1. Network-Oriented CAE on Reliability Engineering : New approach of reliability engineering using computer networks was proposed. It is discussed how to apply 3-tiered Client/Server System (CSS) model for probability plots and FMEA. Combining top-down approach and bottom-up approach, how to pick up necessary failure modes for implementing FMEA is discussed. Also, it is shown it becomes easier to pick up critical components by stratifying potential energy of them and considering its speed for spread.2. Analysis of Lifetime Data based on Reliability Warranty Databases : Manufacturers can easily obtain warranty data, but information from the warranty data is sometimes incomplete. In particular, (i) the warranty database may not provide the exact number of failures for a specific product sold in a particular month; (ii) information may be only available for products which fail within their warranty period. Methods for analyzing su … More ch incomplete warranty data were proposed.3. Reliability and safety analysis focused on human factors : A three element FMEA that takes into account human error, equipment failure and their environment was proposed. Using the proposed method, the analysis of product reliability and safety can be implemented both systematically and comprehensively. Also, the dynamics of trust in and use of automation are shown to depend on the occurrence patterns of malfunctions in the past by two experiments.4. Human interface and safety-assurance design : Safety assurance design and user-centered design were discussed. It was shown that safety assurance design is important than danger avoidance design. Also, a new concept of user-centered design that takes into account a cognitive process of users was proposed.5. Preventive Maintenance using conditioning monitoring system: The bigger and more complex a system becomes, the more difficult to identify its true condition. Conditioning monitoring maintenance which utilizes a monitor to get information on the true state plays a role in such an occasion. A monitoring system with variable thresholds for raising alarm was dealt with. A necessary and sufficient condition is shown under which the optimal maintenance policy is given by k-out-of-n monitoring systems with equal thresholds for each sensor. Less