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威布尔可靠度的置信下限
The Confidence Lower Limits of Weibull Reliatility
【摘要】 本文给出威布尔可靠度的一个近似置信下限公式,它可以方便地为工程师所采用。对■,如果■,■和■是α,β以及,v(t)=(t/a)β的最大似然估计,则■的分布将与参数α、β无关,它的分位点可以从■的分位点求出。记lγ,hγ分别为u=■及■的分位点,则在R>e-1时,■是R(t)的一个置信下限,γ是置信水平。一般它是不足估计,但如果采取合并估计去计算■的分位点表,则可很接近于精确的分位点。
【Abstract】 An approximate confidence lower limits of Weibull Reliability is given in this paper which can be conveniently used by engineers. For R(t)=e-(t/a)■,if ■,■ and ■ are MLE’s of α,β and v(t)=(t/α)β respectively,then v(t)■/β/■(t) is a pivotal quantity,and its percentiles can be calculated from that of ■ log■/α,we denote lr and hr the percentiles of u=■/β and ν(t)u/■(t)respectively,then RL(t)=e■ is a confidence lower limits of R(t) if R>e-1,where γ is confidence level.In general,its underestimated,but it will be close to precise limits if we employ percentiles of pooled estimates to calculate that of ■/β.
【Key words】 Weibull distribution; reliability; confidence lower limits; pivotal quantity; Monte Carlo method;
- 【文献出处】 华东师范大学学报(自然科学版) ,Journal of East China Normal University(Natural Science) , 编辑部邮箱 ,1986年01期
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