Internet-Oriented Reliability Databases and Reliability Methods

1.面向网络的可靠性工程CAE：提出了利用计算机网络进行可靠性工程的新方法。讨论了三层客户/服务器系统(CS)模型在概率图和FMEA中的应用。将自上而下方法和自下而上方法相结合，讨论了如何提取实施FMEA所需的失效模式。此外，通过对关键成分的势能进行分层，并考虑其传播速度，可以更容易地拾取关键成分。基于可靠性保修数据库的寿命数据分析：制造商可以轻松获得保修数据，但保修数据中的信息有时是不完整的。具体地说，(I)保修数据库可能无法提供在特定月份销售的特定产品的确切故障数量；(Ii)信息可能仅适用于在保修期内不合格的产品。SU-…的分析方法提出了更多的不完全保修数据。可靠性和安全性分析侧重于人为因素：提出了一种考虑人为错误、设备故障及其环境的三要素FMEA。利用该方法可以对产品的可靠性和安全性进行系统、全面的分析。此外，通过两个实验表明，对自动化的信任和使用的动态取决于过去故障的发生模式。人机界面和安全保证设计：安全保证设计和以用户为中心的设计。结果表明，安全保障设计比避险设计更重要。提出了以用户为中心的设计理念，考虑了用户的认知过程。使用状态监测系统进行预防性维护：系统越大、越复杂，就越难识别其真实状况。在这种情况下，利用监视器获取真实状态信息的状态监测维护就发挥了作用。介绍了一种具有可变报警阈值的监测系统。给出了n取k监测系统对每个传感器的阈值相等时给出最优维护策略的充要条件。较少

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