无失效数据的可靠性评估和寿命预测

提出一种无失效数据可靠性评估和寿命预测方法 ,给出其可靠度和使用寿命的置信下限。该方法在Weibull分布形状参数下限已知的情况下 ,能将所有无失效寿命数据进行累加 ,大大提高可靠性分析的精度 ;而在对数正态分布标准差上限已知的情况下 ,可以充分发挥对数正态分布的可靠度和使用寿命置信下限较高的优点。此外 ,还建立对数寿命标准差和Weibull分布形状参数之间的关系式 ,从而能够根据工程上积累的大量对数正态分布标准差上限的数据求得Weibull分布形状参数下限 ,反之亦然。本文方法易于计算 ,便于工程应用

RELIABILITY ASSESSMENT AND LIFE PREDICTION FOR ZERO-FAILURE DATA

A new method of reliability assessment and life prediction for zero-failure data is presented. Thus the one-sided lower confidence limits of reliability and life for zero-failure data can be calculated by the method. The reliability assessment and life prediction of the two-parameter Weibull and lognormal distributions are discussed at some length. A relational expression between the standard deviation of logarithmic life and the shape parameter of Weibull distribution is also established. The method has been used in the reliability assessment and life prediction of aircrafts and satellites successfully.