Bionic Investigation on Multiple Intersecting Egg-shaped Pressure Hulls

Abstract

Abstract: Bionic design of multiple intersecting egg-shaped pressure hulls was carried out based on goose egg shell. Firstly, egg-shaped function was established according to a series of biological experiments of egg shells. Then, multiple intersecting egg-shaped pressure hulls in deep sea were designed. Numerical models with 2, 3, 4, 5, 6 eggshells were established. Critical buckling loads, yield loads and buoyancy factors of these hulls were studied. Finally, effects of the main geometric parameters on the performances of the multiple intersecting egg-shaped pressure hulls were analyzed using orthogonal experimental design. The results show that Kitching function is the best egg-shaped function describing goose egg meridian. The length-to-eccentricity ratio is as 45, and the egg shape index is as 0.69. The critical buckling loads of the egg-shaped pressure hulls are larger than yield loads, indicating that strength is the main factor of the structural design. The number of eggshells has little influence on the yield loads and buoyancy factors, while the shell thickness has a great influence on them. The geometrical parameters of the rib have little influence on the buoyancy factors but great on the yield loads.

Key words: pressure hull, multiple intersecting egg-shaped, egg-shaped function, bionic design

摘要： 以鹅蛋壳为生物原型，开展了多蛋交接耐压壳仿生设计及性能研究工作。首先，通过蛋壳生物学试验，建立了蛋形函数；其次，对深海多蛋交接耐压壳进行设计，建立了蛋壳个数分别为2、3、4、5、6的数值模型，研究其临界屈曲载荷、极限强度载荷和储备浮力特性；最后，通过正交试验设计，分析了多蛋交接耐压壳主要几何参数对其性能的影响规律。结果表明：Kitching蛋形函数与鹅蛋经线的吻合程度最高，其长轴与偏心距之比取45，蛋形系数取0.69；深海多蛋交接耐压壳的临界屈曲载荷远大于极限强度载荷，即极限强度载荷为结构设计的主要因素；蛋形壳个数对极限强度载荷和浮力系数影响很小；蛋形壳厚度对极限强度载荷和浮力系数影响较大；加强肋对浮力系数影响较小，而对极限强度载荷影响较大。

关键词: 耐压壳, 多蛋交接, 蛋形函数, 仿生设计

CLC Number:

U661.4
TE58

Zhang Jian, Zuo Xinlong, Wang Weibo, Tang Wenxian. Bionic Investigation on Multiple Intersecting Egg-shaped Pressure Hulls[J]. China Mechanical Engineering.

张建, 左新龙, 王纬波, 唐文献. 多蛋交接耐压壳仿生研究[J]. 中国机械工程.

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