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研究了基于Birnbaum-Saunders(B-S)分布的可靠疲劳寿命分析及评估方法,建立了基于中位值和平均值的B-S分布寿命分散系数确定方法.并针对特殊试验数据情形,建立了基于最大和最小顺序统计量的B-S分布寿命分散系数确定方法.公式表明:随着B-S分布尺度参数的增大,其中位寿命分散系数与平均寿命分散系数递减,而最大与最小寿命分散系数不变.案例计算结果表明,B-S分布的寿命分散系数通常小于对数正态分布的寿命分散系数.
Based on the Birnbaum-Saunders (BS) distribution, a reliable fatigue life analysis and evaluation method is studied, and a method to determine the BS distribution lifetime dispersion coefficient is established based on the median and average values.According to the special experimental data, the maximum and minimum The method for determining the BS distribution lifetime dispersion coefficient of the order statistics is as follows: The formula shows that as the BS distribution scale parameter increases, the median life distribution coefficient and the average life distribution coefficient decrease while the maximum and minimum life distribution coefficients remain unchanged. It shows that the life distribution coefficients of BS distribution are usually smaller than the life distribution coefficients of lognormal distribution.