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介绍了随机载荷与应力在时间域与频率域的定量描述方法；推出了模糊分级统计方法，进而研究了模糊随机载荷谱；同时还给出了随机载荷与应力计算公式中一些系数的模糊性的定量描述方法。
The quantitative description method of random loading and stress in time domain and frequency domain is introduced. The fuzzy grading statistical method is introduced to study the fuzzy random load spectrum. At the same time, some fuzzy coefficients in random load and stress formulas Quantitative description of the method.