基于模糊故障树的燃料电池发动机氢安全

针对燃料电池发动机的安全可靠性,分析了氢安全和电安全的基本要求及其影响因素,重点从氢安全角度建立了以氢气泄露为顶事件的故障树模型.考虑到底事件和中间事件发生故障概率的模糊性和不确定性,将模糊数学和故障树分析法相结合,对底事件的故障概率进行模糊化并计算了顶事件发生的模糊概率;然后,采用模糊数中值法进行了各底事件的模糊重要度分析,找出了燃料电池发动机安全性的薄弱环节并提出了相关整改措施.研究结果表明,该方法较之传统故障树分析法实用、有效,对提高燃料电池发动机的可靠性与安全性设计具有指导作用.

Study on Hydrogen Safety of Fuel Cell Engine Based on Fuzzy Fault Tree

According to the safety and reliabilty performance of fuel cell engine, the requirement and influence factors of its hydrogen safety and electrical safety were analyzed, and mainly from the point of hydrogen safety, the fault tree model of hydrogen leak was set up. Considering the fuzzy and uncertain probability of each elementary and middle event, fuzzy theory and fault tree analysis were combined to express each probability, and the fuzzy probability of top event was figured out, then the fuzzy importance of each elementary event was analyzed by fuzzy number median methods,the weakness of its safety and reliabilty was presented, finally several improvement measures were put forward. The results prove that the fuzzy fault tree adopted in this paper is more applicable and effective than traditional fault tree analysis, which can provide a guidance for enhancing the reliable and secure design of fuel cell engine in the future.