智能水下机器人自救系统的可靠性预计

针对智能水下机器人自救系统的控制器部分建立了其可靠性数学模型,应用元件应力分析法,预计出了自救系统控制器部分的故障率λ3及平均故障间隔时间MTBF,并总结了若干提高系统可靠性的途径。     

验证复杂电子系统任务可靠度的试验方案

阐述了基本可靠性验证试验不能取代任务可靠度验证试验的方案。在很多情况下,系统的基本可靠性验证试验获得通过,但任务可靠性却达不到指标要求;相反,任务可靠性验证试验则可以包含基本可靠性的信息。介绍了同时进行两种验证试验的试验方法和数据处理方法。     

基于威布尔模型的数控机床可靠性分析

针对数控机床的运行可靠性规律进行了研究。根据采集的国产机床运行数据,对其无故障运行间隔时间进行统计分析,确定其分布类型服从威布尔分布。利用威布尔分布的参数评估方法,确定出三参数威布尔分布的各个特征量,并与两参数威布尔分布相比较。运用威布尔分布模型及可靠性评定方法确定出数控机床的平均无故障时间和使用可靠性规律。     

Technology for highly dependable large capacity uninterruptible power supply system

Powerful information networks comprising computers and communication equipment are a modern fact of life. Our dependence upon them requires that they function with no problems. System safety is crucial. Uninterruptible power supply (UPS) systems are commonly equipped to supply stable power regarding critical loads, e.g., large computer centers, telephone and telecommunication centers, aviation control systems, etc. Several types of UPS systems are now used in many of these important fields. However, there has been to date little numerical evaluation vis-a-vis system reliability. This paper evaluates mean time between failures (MTBF) of parallel redundant UPS systems, and reports that the MTBF of two sets of parallel redundant UPS systems is lower than that of 3 sets of parallel redundant UPS systems under some circumstances. Continuous power supply reliability of the UPS system with bypass and uninterruptible transfer switch is much higher than is the case for other UPS systems lacking bypass circuit and uninterruptible transfer switch. Highly reliable parallel operation technology is also shown.     

高可靠性工控设备寿命验证试验的方案设计

随着高可靠性工控设备的问世,需要一套具有可操作性的寿命验证方案对可靠性数据进行验证。在介绍了相关可靠性理论的基础上,将传统的平均无故障工作时间(MTBF)验证方法与加速寿命方法相结合,构建了一套验证高可靠性设备寿命的方案。该方案在不降低置信度水平的前提下,能够较快速地获取设备实际的MTBF,需要的样本数量也相对较少。     

MTBF分析在电能表自动化检定系统的应用

介绍了电力公司计量中心的电能表自动化检定流水线系统的技术特点、运维管理要求,通过MTBF分析,确定了检定单元各部件的失效时间与概率,并制订针对性的运维方案和备品备件,给流水线的运行管理工作提供了理论支撑。     

An extended systematic literature review on provision of evidence for safety certification

ContextCritical systems in domains such as aviation, railway, and automotive are often subject to a formal process of safety certification. The goal of this process is to ensure that these systems will operate safely without posing undue risks to the user, the public, or the environment. Safety is typically ensured via complying with safety standards. Demonstrating compliance to these standards involves providing evidence to show that the safety criteria of the standards are met.ObjectiveIn order to cope with the complexity of large critical systems and subsequently the plethora of evidence information required for achieving compliance, safety professionals need in-depth knowledge to assist them in classifying different types of evidence, and in structuring and assessing the evidence. This paper is a step towards developing such a body of knowledge that is derived from a large-scale empirically rigorous literature review.MethodWe use a Systematic Literature Review (SLR) as the basis for our work. The SLR builds on 218 peer-reviewed studies, selected through a multi-stage process, from 4963 studies published between 1990 and 2012.ResultsWe develop a taxonomy that classifies the information and artefacts considered as evidence for safety. We review the existing techniques for safety evidence structuring and assessment, and further study the relevant challenges that have been the target of investigation in the academic literature. We analyse commonalities in the results among different application domains and discuss implications of the results for both research and practice.ConclusionThe paper is, to our knowledge, the largest existing study on the topic of safety evidence. The results are particularly relevant to practitioners seeking a better grasp on evidence requirements as well as to researchers in the area of system safety. As a major finding of the review, the results strongly suggest the need for more practitioner-oriented and industry-driven empirical studies in the area of safety certification.     

计算机应用系统可用性预测方法

随着银行业务领域的拓展,与之对应支持的科技应用系统也越来越多,如何根据当前系统的使用情况,对系统未来性能进行预测,从而很好的指导各个应用系统的维护工作成为当前亟待解决的问题.通过引入可靠性关于时间t的指数分布,对计算机系统未来的可靠性进行预测,从而获得系统可用性、和平均故障间隔的预测值.     

三峡五级船闸控制系统可靠性分析

 为了分析三峡五级船闸控制系统的可靠性，采用了故障树分析法，建立了控制系统的故障树 模型，并对该两冗余系统进行了定性及定量分析，由此计算出平均无故障时间(MTBF) 。在此基础上，进一步提出了通过增加仿真模型来改进并联冗余结构，从而提高了系统决策 可靠性。     

提高电力调度通信网可靠性的技术实现

描述了3种提高电力调度通信网可靠性和稳定性的技术实现方式,包括中心调度机冗余技术,双U口技术以及路由备份技术。阐述了在工程组网中,如何综合运用这3种技术,组成一个完整的容灾调度系统;同时介绍了这种容灾调度系统的2种衍生运用方式,为电力用户提供新的应用。