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Optimum design of multiple intersecting spheres deep-submerged pressure hull

机译：多个相交球体深潜压力船体的优化设计

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The multiple intersecting spheres (MIS) pressure hull is a logical derivative of the single unstiffened sphere, which is frequently used for deep operating, small submersibles because of its attractive low buoyancy factor. This paper investigates the optimum design of an MIS deep-submerged pressure hull subjected to hydrostatic pressure, using a powerful optimization procedure combined the extended interior penalty function method (EIPF) with the Davidon-Fletcher-Powell (DFP) method. In this study, the thickness of the shell, the width of the rib-ring, the inner radius of the rib-ring and the angle of intersection of the spherical shell are selected as design variables, and structural failure and human requirements are considered to minimize the buoyancy factor. Additionally, a sensitivity analysis is performed to study the influence of the design variables on the optimal structural strength design. The results reveal that the shell thickness is most important to lobar buckling strength, and that rib-ring width, rib-ring inner radius and spherical shell intersection angle are most important to rib-ring hoop strength. Optimization results may provide a valuable reference for designers.
机译：多个相交球体（MIS）压力船体是单个未加筋球体的合乎逻辑的衍生产品，由于其有吸引力的低浮力因数，常用于深潜，小型潜水器。本文使用扩展的内部罚函数法（EIPF）与戴维顿-弗莱彻-鲍威尔（DFP）方法相结合的强大优化程序，研究了承受静水压力的MIS深潜耐压船体的优化设计。在这项研究中，选择壳体的厚度，肋环的宽度，肋环的内半径和球形壳体的相交角作为设计变量，并考虑结构破坏和人工要求最小化浮力系数。此外，进行了敏感性分析以研究设计变量对最佳结构强度设计的影响。结果表明，壳厚度对大叶屈曲强度最重要，而肋环宽度，肋环内半径和球壳相交角对肋环箍强度最重要。优化结果可能为设计人员提供有价值的参考。

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