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本文在总结国内外模糊故障树分析研究现状的基础上，引入模糊数学中的扩展原理，对基于故障树各底事件发生概率为模糊数情形的故障树分析方法作了研究，最后给出了一个应用实例。
Based on the summarization of the research status of fuzzy fault tree analysis at home and abroad, this paper introduces the extension principle in fuzzy mathematics, and studies the fault tree analysis method based on the situation that the probability of each event occurring in the fault tree is fuzzy. Finally, Applications.