This paper studies the aeroelasticity of a stiffened cantilever plate using composite material and novel structural layouts. A comprehensive parametric study is conducted to determine the influence of different design parameters on the aeroelastic boundaries. Design parameters include plate sweep angle, ply orientation, stringer cross-section and stringer sweep angle. Nastran is used to run the aeroelastic analysis, and the process is automated using ${\rm{Matla}}{{\rm{b}}^{}}$ . The structure of the plate is modelled using laminate elements whereas the stringers are modelled using the Euler-Bernoulli beam elements. The unsteady aerodynamic loads are modelled using doublet-lattice method (DLM) and the structural and aerodynamic meshes are connected using an infinite plate surface (IPS) spline. A mesh sensitivity analysis is conducted to ensure fine meshes for the aerodynamics and structure. The study’s findings demonstrate the benefits of employing forward swept (Fw) stringers since it increases flutter speed by almost 38% compared to the unswept stringers case and prevents divergence. Moreover, the static aeroelastic analysis illustrates that the utilisation of Fw swept stringers can reduce the average tip displacement and tip twist effectively. T-shaped stringers are recommended to stiffen the plate due to their lower impact on the total mass of the plate. In some configurations, the structural layout has a much higher effect on the aeroelastic instabilities when compared to the material effect (ply orientation). However, results suggest combining both for some cases to get balanced washin and washout effects.

中文翻译：

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使用复合材料和结构布局对加劲悬臂板进行气动弹性剪裁：参数化研究

本文研究了采用复合材料和新颖结构布局的加劲悬臂板的气动弹性。进行全面的参数研究以确定不同设计参数对气动弹性边界的影响。设计参数包括板扫角、铺层方向、纵梁横截面和纵梁扫角。 Nastran 用于运行气动弹性分析，该过程使用以下命令实现自动化 ${\rm{马特拉}}{{\rm{b}}^{}}$ 。板的结构使用层合板单元建模，而纵梁使用欧拉-伯努利梁单元建模。使用双点阵法 (DLM) 对非定常空气动力载荷进行建模，并使用无限板表面 (IPS) 样条连接结构网格和空气动力网格。进行网格敏感性分析以确保空气动力学和结构的精细网格。该研究的结果证明了采用前掠 (Fw) 纵梁的好处，因为与未后掠纵梁的情况相比，它使颤振速度提高了近 38%，并且可以防止发散。此外，静态气动弹性分析表明，采用Fw扫掠纵梁可以有效降低平均尖端位移和尖端扭转。建议使用 T 形纵梁来加固板，因为它们对板总质量的影响较小。在某些配置中，与材料效应（层方向）相比，结构布局对气动弹性不稳定性的影响要大得多。然而，结果表明在某些情况下将两者结合起来以获得平衡的洗涤和冲洗效果。