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首页> 外文会议>The 7th China-Japan-Korea joint symposium on optimization of structural and mechanical systems >SIZE AND LAYOUT OPTIMIZAITONS OF STIFFENED SHELL UNDER AXIAL COMPRESSION
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SIZE AND LAYOUT OPTIMIZAITONS OF STIFFENED SHELL UNDER AXIAL COMPRESSION

机译：轴压下加筋壳的尺寸和布局优化

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摘要

The extensive use of stiffened shells in aerospace industries is mainly motivated by the high stiffness-to-weight and strength-to-weight ratios.In this study, a bi-step optimization framework is proposed.In the first step, Smeared Stiffener Method (SSM) companied with Rayleigh-Ritz method are used to obtain the critical buckling load, instead of employing Finite Element Method (FEM) to obtain the collapse load, due to the fact that the trend of critical buckling load substantially accords with the one of collapse load. Then the size optimization is performed to find the optimum design for maximum critical buckling load under structural weight constraint using Genetic Algorithm (GA), and the design variables include skin thickness, stiffener spacing, stiffener width and height.In the second step, a stiffener spacing distribution function is used to represent the location of each circumferential stiffener along the shell length.FEM is employed to simulate the deformed shapes and collapse loads of stiffened shells with unequal spacing. The layout of circumferential stiffeners can be adjusted and optimized according to the position where collapse occurs from the FEM analysis.A 3000-mm-diameter orthogrid stiffened shell is established to demonstrate the validity of the proposed optimization framework.Results show that the collapse load of stiffened shell is improved by 13.8%, while the structural weight is decreased by 0.4%.Hence, it may be concluded that the proposed framework is suitable for the optimization of stiffened shells.
机译：刚性壳在航空航天工业中的广泛使用主要是由高刚度重量比和强度重量比推动的。本研究中，提出了一个两步优化框架。由于临界屈曲载荷的趋势与倒塌趋势基本一致，因此，与瑞利-里兹方法相结合的SSM用来获得临界屈曲载荷，而不是使用有限元方法（FEM）来获得倒塌载荷。加载。然后使用遗传算法（GA）进行尺寸优化，以找到在结构重量约束下最大临界屈曲载荷的最佳设计，设计变量包括蒙皮厚度，加劲肋间距，加劲肋宽度和高度。间距分布函数用于表示每个圆周加劲肋沿壳长的位置。有限元法用于模拟不等间距的加劲壳的变形形状和塌陷载荷。通过有限元分析可以根据发生塌陷的位置来调整和优化周向加劲肋的布局。建立了直径为3000mm的正交格栅加劲壳，以证明所提出的优化框架的有效性。加劲壳提高了13.8％，结构重量减少了0.4％，因此可以得出结论，该框架适合加劲壳的优化。

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