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1、BUCT College of Information Science 为单元故障率的实际值。,事故树定量分析,可修复系统的单元故障率,可修复系统的单元包括部件和元件。其故障率q的定义为:,式中,n为各单元发生故障 的总次数;ti为第i-1到第i次故障的间隔时间。,物的故障率,BUCT College of Information Science I(3) =7/16; I(4) =5/16; I(5) =5/16 基本事件重要度排序: I(1) =I(3) I(4) = I(5) I(2),事故树定量分析,BUCT College of Information Science & Techn
2、ology,事故树定量分析,简易方法确定各基本事件的结构重要度系数 分子即为:Xi=1, (X)=1的个数减去Xi=0, (X)=1的个数,BUCT College of Information Science & Technology,BUCT College of Information Science & Technology,BUCT College of Information Science & Technology,BUCT College of Information Science & Technology,BUCT College of Information Scienc
3、e & Technology,BUCT College of Information Science & Technology,简易方法确定各基本事件的结构重要度系数 I(1) = (1/2n-1)(12-5)=(1/16)7=7/16 I(2) = (1/2n-1)(9-8)=(1/16)1=1/16 I(3) = (1/2n-1)(12-5)=(1/16)7=7/16 I(4) = (1/2n-1)(11-6)=(1/16)6=6/16 I(5) = (1/2n-1)(11-6)=(1/16)6=6/16 基本事件重要度排序: I(1) =I(3) I(4) = I(5) I(2),事故树定量分析,BUCT College of Information Science & Technology,