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介绍了通风机失效树的故障模型和概率计算的方法，利用西门德勒斯法对失效树进行定性分析与定量计算，确定了整机的可靠度及其它可靠性指标，找出了系统失效的关键零部件。
The failure model of fan failure tree and the method of probability calculation are introduced. The failure analysis and quantitative calculation of the failure tree are carried out by using Simondels method, the reliability and other reliability indexes of the whole machine are determined, and the system failure D.