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提出在短周期谱载荷下，飞机结构设计阶段，裂纹扩展模型ｄａ／ｄｔ＝Ｑａｂ参数的估算法，此法可以依据材料参数、载荷谱和结构的几何特征使用优化设计方法计算
The estimation method of da / dt = Qab parameter at the stage of aircraft structure design and crack propagation is put forward under the condition of short-period spectral loading. The method can be calculated by using the optimization design method according to the material parameters, load spectra and geometric features of the structure