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基于贝叶斯网络的机载氧气系统可靠性评估

王鹏a,陈曦b,阎芳a,赵长啸a   

  1. (taptap下载安装安卓a.天津市民用航空器适航与维修重点实验室;b.中欧航空工程师学院,天津300300)
  • 收稿日期:2015-03-01 修回日期:2015-03-29 出版日期:2016-04-23 发布日期:2016-06-03
  • 作者简介:王鹏(1982—),男,天津人,副研究员,硕士,研究方向为民机系统安全性设计与评估、机载电子硬件适航技术.
  • 基金资助:

    国家自然科学基金项目(U1333120);国家重点基础研究发展计划(973计划)(2014CB744902)

Reliability assessment of airborne oxygen system based on Bayesian network

WANG Penga, CHEN Xi b, YAN Fanga, ZHAO Changxiaoa   

  1. (a. Civil Aircraft Airworthiness and Maintenance Key Lab of Tianjin; b. Sino-European Institute of
    Aviation Engineering, CAUC, Tianjin 300300, China)
  • Received:2015-03-01 Revised:2015-03-29 Online:2016-04-23 Published:2016-06-03

摘要:

通过分析机载氧气系统架构,构建基于贝叶斯网络的系统可靠性评估模型。通过前向和后向推理得到叶节点失效率及根节点后验失效概率,结合重要度及联合重要度的大小,找出影响系统可靠性的关键因素,求解最大可能解释(MPE)。通过与故障树分析(FTA)法对比,说明该方法的优势。综合各定量分析结果,说明贝叶斯网络方法进行可靠性评估的有效性,评估结果还可对系统结构设计和故障诊断提供相关参考信息。

关键词: 贝叶斯网络, 机载氧气系统, 定量评估

Abstract:

By analyzing airborne oxygen system architecture, the system reliability assessment model is built based on Bayesian network. The failure rate of leaf node and posteriori failure probability of root nodes are obtained by the forward and backward inferences, the key factors of system reliability are identified based on importance sequence and joint importance, the most probable explanation (MPE)is given. The advantages of the method are explained by comparing with FTA. Quantitative analysis proves the effectiveness of reliability assessment by using Bayesian network, and assessment results can also provide referencial information for the system structure design and fault diagnosis.

Key words: Bayesian network, airborne oxygen system, quantitative assessment

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