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在Y1 ,… ,Yn- 1 ,Yn 相互独立且服从威布尔分布情况下得到结构可靠度Pr(Yn >a1 Y1 +… +an- 1 Yn - 1 )的最小方差无偏估计及其置信下限
The unbiased estimate of minimum variance and its lower confidence limit for the structural reliability Pr (Yn> a1Y1 + ... + an-1Yn-1) are obtained when Y1, ..., Yn-1 and Yn are independent of each other and obey the Weibull distribution