航空学报 > 1993, Vol. 14 Issue (3): 185-187

两类可靠性指标之间的关系研究

薛景川, 焦坤芳, 冯蕴雯   

  1. 陕西省耀县2号信箱,耀县 727100
  • 收稿日期:1992-07-16 修回日期:1992-09-05 出版日期:1993-03-25 发布日期:1993-03-25

A STUDY ON THE RELATION BETWEEN TWO KINDS OF RELIABILITY INDEXES

Xue Jing-chuan, Jiao Kun-fang, Feng Yun-weng   

  1. Box 2, Yao country, Shaan Xi, 727100
  • Received:1992-07-16 Revised:1992-09-05 Online:1993-03-25 Published:1993-03-25

摘要: 从可靠性寿命的定义出发,在一定的假设前提下,导出了双参数中威布尔分布的斜率参量α和对数正态分布子样标准差σ之间的关系;进而得到建立在对数正态分布基础上的疲劳寿命N_(90/99.9)和建立在双参数威布尔分布基础上的疲劳寿命N_(95/95)之间的关系;计算结果表明上述两类可靠性指标是一致的。

关键词: 可靠度, 置信度, 寿命

Abstract: According to the definition of reliability life, on certain condition of assumption, the relation between the slope parameter a of the two parameter Weibull distribution and the sample standard deviation a is introduced in this paper, and then, the relation between the fatigue life N90/99.9, the reliability index of which is based on the lognormal distribution, and the fatigue life N95 / 95, the reliability index of which is based on the two parameter Weibull distribution, is introduced. Calculated results show that the forenamed two kinds of reliability indexes are identical.

Key words: reliability, confidence, life