Aeroelastic stability of a twin-box deck: Comparison of different procedures to assess the effect of geometric details
Aeroelastic stability of a twin-box deck: Comparison of different procedures to assess the effect of geometric details
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DOI：
10.1016/j.jweia.2021.104878
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发表时间：
2022-01-01
影响因子：
4.8
通讯作者：
Larsen, A.
中科院分区：
文献类型：
--
作者：
Argentini, T.;Rocchi, D.;Larsen, A.
本文的重点是评估双箱甲板气动稳定性的三种不同方法的比较：实验自由运动测试、使用准稳态理论的数值模拟以及使用颤振导数的数值模拟。为此，这些方法用于比较三种甲板配置：标称双箱甲板配置、包括不同走道孔隙率的变体以及包含不同形状的双箱内角的变体。尽管这些配置在几何上非常相似，但它们的气动弹性行为在临界颤振速度、特征值/特征向量趋势和作为风速函数的静态变形方面却截然不同。结果表明，自由运动测试为每种配置提供了参考气动弹性解决方案，但没有提供任何关于差异原因的见解；基于气动颤振导数系数的模拟可以提供准确的结果和见解，但前提是在所有感兴趣的平均迎角上测量非稳态系数；如果通过实验测量扭转气动弹性阻尼，基于静力系数斜率的准稳态模拟可以非常精确地定义颤振附近的气动弹性行为。因此，每种方法都有优点和缺点，整篇论文都强调和讨论了这些优点和缺点。
Focus of this paper is the comparison of three different approaches to assess the aerodynamic stability of twin-box decks: experimental free-motion tests, numerical simulations using quasi-steady theory, and numerical simulations using flutter derivatives. To this end, these approaches are used to compare three deck configura-tions: a nominal twin-box deck configuration, a variation that includes a different walkway porosity, and a variation that consists in a different shape of the twin-box internal corner. Even though these configurations are geometrically very similar, their aeroelastic behaviour is quite different in terms of critical flutter speed, eigenvalue/eigenvector trend and static deformation as a function of wind speed. It is shown that free-motion tests provide the reference aeroelastic solution for each configuration, but do not provide any insight on the reason of the differences; simulations based on aerodynamic flutter derivative co -efficients provide accurate results and insights, but only if unsteady coefficients are measured over all the mean angles of attack of interest; quasi-steady simulations, based on static coefficients slopes, can define quite pre-cisely the aeroelastic behaviour in the nearby of flutter, provided that torsional aeroelastic damping is measured experimentally. Each method has therefore advantages and disadvantages that are highlighted and discussed throughout the paper.