民机结构的疲劳寿命服从双参数威布尔分布，其分散系数与战斗机基于对数正态分布的疲劳寿命分散系数存在明显的不同。
The fatigue life of civil aircraft structures obeys two parameter Weibull distribution, its scatter factor is significantly different from that obeys logarithm normal distribution.
本文对确定威布尔分布三参数的相关系数法做了重要改进，使得计算量大为简化。
This paper makes an important improvement to correlation coefficient method for 3-parameter Weibull distribution and then reduces its compute largely.
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