基于实测数据的疲劳寿命分散系数取值研究

随着基准谱、严重谱编制研究的深入，利用实测数据编制载荷谱在编谱方法和分散系数取值等方面需 求愈发迫切。从正态概率分布理论出发,讨论影响疲劳寿命分散系数取值的主要因素；针对基准谱和严重谱之 间的差异性，提出基准谱和严重谱的折算思路和方法，并通过实测数据编制的基准谱和严重谱折算系数进行比 较分析。结果表明：采用本文方法可以实现基准谱与严重谱之间损伤分散系数的折算取值。

Research on the fatigue life scatter factor base on measured spectrum

With the deep development of baseline spectrum or severe spectrum, it is becoming more urgent that how to develop a load spectrum and how to determine the fatigue life scatter factor when the measured data is used to develop the load spectrum. Based on the normal distribution theory, this paper discusses the factors that affect the dispersion of fatigue life, especially the difference between the baseline spectrum and the severe spectrum, and then proposes an idea and a method of the conversion of the baseline spectrum to the severe spectrum. The spectrum conversion factor is calculated and compared by the baseline spectrum and the severe spectrum developed by some measured data. The results show that both spectra can be converted to obtain the value of dispersion coefficient.