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Aeroelastic and local buckling optimisation of a variable-angle-tow composite wing-box structure

机译：可变角度拖曳复合翼箱结构的空气弹性和局部屈曲优化

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摘要

Benefiting from curved fibre paths, variable-angle-tow (VAT) fibre composites feature a larger design space than traditional straight-fibre reinforced plastics. Herein, an optimisation framework of a full-scale wing-box structure with VAT-fibre composites is presented, aiming at minimised mass and optimised local buckling performance under realistic aeroelastic loading conditions. Local buckling analyses on individual subsections of the wing are performed with refined finite-element models by extracting running loads from an aeroelastic analysis of the entire wing structure. Using this global-local approach, an optimisation is conducted with static failure, aeroelastic, buckling and manufacturing constraints to obtain optimised structural parameters for straight- and VAT-fibre composite wing-box architectures. By optimising wing-skin thicknesses, fibre paths and wing-spar geometry simultaneously via a genetic algorithm, the potential benefit of a VAT design is explored. In addition, the continuous tow shearing (CTS) manufacturing process, which introduces layer thickness variations as tows are steered, is explored. A mass reduction of 12.5% and 13.2% is obtained by using the constant-thickness VAT and variable-thickness CTS designs, respectively, compared to a baseline quasi isotropic straight-fibre design. The optimised wing-skin thickness distribution also suggests that local buckling is the critical failure mode in specific regions, and therefore needs to be included during aeroelastic optimisation.
机译：受益于弯曲光纤路径，可变角度丝束（VAT）纤维复合材料具有比传统的直纤维增强塑料更大的设计空间。这里，提出了一种具有VAT-纤维复合材料的全尺寸翼盒结构的优化框架，旨在最小化质量并在现实的气弹性负载条件下优化局部屈曲性能。通过从整个机翼结构的气动弹性分析中提取运行负荷，通过精制有限元模型进行机翼的各个子部分的局部屈曲分析。使用这种全局本地方法，通过静态故障，空气弹性，屈曲和制造限制进行了优化，以获得直的直线和VAT纤维复合翼盒架构的优化结构参数。通过通过遗传算法同时优化翼状皮肤厚度，纤维路径和翼状翼状物质，探讨了增值税设计的潜在益处。另外，探索了作为拖带的层厚度变化引入连续拖曳剪切（CTS）制造工艺，被引导。与基线准各向同性直纤维设计相比，通过使用恒定厚度VAT和可变厚度CTS设计，可以获得12.5％和13.2％的质量减少。优化的翼形皮肤厚度分布还表明，本地屈曲是特定区域中的临界失效模式，因此需要在空气弹性优化期间包括。

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