This paper describes a design optimization study of the composite egg-shaped submersible pressure hull employing optimization and finite element analysis (FEA) tools as a first attempt to provide an optimized design of the composite egg-shaped pressure hull for manufacturing or further investigations. A total of 15 optimal designs for the composite egg-shaped pressure hull under hydrostatic pressure are obtained in terms of fibers’ angles and the number of layers for 5 lay-up arrangements and 3 unidirectional (UD) composite materials. The optimization process is performed utilizing a genetic algorithm and FEA in ANSYS. The minimization of the buoyancy factor $(B.F)$ is selected as the objective for the optimization under constraints on both material failure and buckling strength. Nonlinear buckling analysis is conducted for one optimal design considering both geometric nonlinearity and imperfections. A sensitivity study is also conducted to further investigate the influence of the design variables on the optimal design of the egg-shaped pressure hull.

本文描述了采用优化和有限元分析 (FEA) 工具的复合蛋形耐压船体的设计优化研究，作为首次尝试为制造或进一步研究提供复合蛋形耐压船体的优化设计。针对5种叠层布置和3种单向（UD）复合材料，从纤维角度和层数等方面得到了静水压力下复合蛋形耐压壳的15种优化设计。优化过程是利用遗传算法和 ANSYS 中的 FEA 执行的。最小化浮力系数$(乙.F)$被选为在材料失效和屈曲强度的约束下进行优化的目标。非线性屈曲分析是针对一种同时考虑几何非线性和缺陷的优化设计进行的。还进行了敏感性研究，以进一步研究设计变量对蛋形耐压船体优化设计的影响。