Buckling Optimization of Variable-Angle-Tow Panels Using the Infinite-Strip Method
Buckling Optimization of Variable-Angle-Tow Panels Using the Infinite-Strip Method
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DOI：
10.2514/1.j052123
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发表时间：
2013-06-01
期刊：
影响因子：
2.5
通讯作者：
Butler, Richard
中科院分区：
文献类型：
--
作者：
Liu, Wenli;Butler, Richard
提出了一种受屈曲和制造约束的变角牵引板的最小质量优化策略。使用快速运行的优化包，采用无限条屈曲分析和基于梯度的优化方法进行优化。在优化策略中考虑了一种新的变角度丝束制造方法--连续丝束剪切法，该方法由于干丝束的剪切变形而产生变厚度，从而提供了良好的质量。得到了变角拖曳壁板的优化设计，并与无厚度变化的壁板进行了比较。不同的面板边界条件进行了研究和讨论。结果表明，边界条件对最佳纤维路径有很大影响。与不考虑壁厚变化的优化设计相比，考虑壁厚变化的优化设计可使结构质量减少20%以上。在优化过程中考虑了板厚的变化，使结构的屈曲应变降低到了实用水平。由无限条法得到的屈曲载荷和振型与有限元结果吻合较好。该优化策略提供了具有良好精度和低计算成本的结构有效的解决方案。
A minimum-mass optimization strategy for variable-angle-tow panels subject to buckling and manufacturing constraints is presented. The optimization is performed using a fast-running optimization package that employs infinite-strip analysis for buckling and a gradient-based optimization method. A new variable-angle-tow-panel manufacturing method, continuous tow shearing, providing good quality, is considered in the optimization strategy where variable thickness occurs due to the shear deformation of dry tows. Optimum designs of variable-angle-tow panels are obtained and compared with panels without thickness variation. Different panel boundary conditions are investigated and discussed. The results show that boundary conditions have dramatic effects on optimum fiber paths. Over 20% mass saving is obtained for the optimization strategy with thickness variation compared with the design without thickness variation. The buckling strains are reduced to a practical level when the thickness variation is considered in the optimization. The buckling loads and mode shapes obtained from the infinite-strip method are in a good agreement with finite-element results. The optimization strategy provides structurally efficient solutions with good precision and low computational cost.