关键词: 压窝板, 气密载荷, 参数化建模, 尺寸优化

Abstract: To address the risk of fatigue crack initiation in the pressurized dimpled panel of the mid-fuselage of a certaincivil aircraft type, this paper establishes a multi-objective optimization procedure oriented to the dominant con-figuration of the crack critical region (R region). Finstly, the dimple fillet radius r, the panel thickness t and thedimple height h are taken as design variables. The objectives to be minimized are the maximum principal stressin the R region and the structural volume of the dimpled panel. Secondly, critical region retention constraints areimposed on the remaining stress concentration regions, Finally, the optimization is carried out based on the de-sign of experiments and surrogate models. The results show that the mean absolute errors of the surrogate modelsin predicting the maximum principal stress in the R region and the structural volume are 0.39% and 2.59%, re-spectively. The degree of influence of the dimensional parameters on the stress in the R region follows the onder t> A > 7. The critical region retention constraints can effectively prevent the migration of the dominant high-stressregion. The prediction errors of the maximum principal stress in the R region for the recommended configura-tions are -0.16% and -0.49%, respectively. The proposed method can reduce the stress level in the Rt regionwhile taking lightweight design into account, and can maintain the R region as the dominant critical region. Itthus provides a reference for the dimensional design and configuration screening of pressurized dimpled panels.

Key words: dimpled panel, pressurization load, parametric modeling, dimensional optimization