基于最大熵原理和模煳方法的极小子样产品可靠性分析.pdf

* 中国工程物理研究院结构力学研究所 西南交通大学机械工程学院 : , 2 , , : ; ; ; ; Abstract: Given that product life follows lognormal distribution, fatigue life scatter factor method ( LSF) is applied to evalu ating the reliabilit of product with 1 or 2 samples. Two formulas for calculating LSF are introduced. The value of LSF has influ ence on product reliabilit and the product life standard error ( LSE) is one of main factors that determine LSF. A method for cal culating LSE based on maximum entrop principle and fuzz s nthesis anal sis is proposed and an example is given to illustrate how to use it. Keywords: lognormal distribution; scatter factor; maximum entrop principle; fuzz s nthesis anal sis; life standard error 1 2 , [ 1~ 2] S N f 50 N , p S = N / N (1) f 50 p , Ba es , , [ 3] p N N [4] p p ( 6~ 7 ) , = u + u : u , u N p N p p , ( 1~ 2 ) , , ^ ^ [5] N = u + u (2)