分别利用对数正态分布函数和威布尔分布函数进行曲轴扭转疲劳寿命分析, 利用这两种数学统计模型获得某曲轴在不同扭矩载荷和不同存活率下的疲劳寿命估计值, 通过研究和分析两种数学统计模型处理同一组数据获得的疲劳寿命估计值之间的差异, 获得了两种数学统计模型各自的最佳应用范围。结果表明: 该研究可为后续曲轴扭转疲劳寿命分析中合理选择数据处理的数学统计模型提供参考, 从而得到可靠性更高的分析结果。

The torsion fatigue life of crankshafts was analyzed by log-normal distribution function and Weibull distribution function. Estimated values of the fatigue life of crankshafts under different torque and survival probability were obtained by these two mathematical statistical models. Through the research and analysis on the difference between the estimated values of fatigue life obtained by these two mathematical statistical models, the best application interval of two mathematical statistical models was acquired. It could provide the reference to choose the reasonable mathematical statistical model for data processing in the subsequent torsion fatigue life analysis of crankshafts, and the more reliable analysis results could be gained.