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Time to flutter theory for viscoelastic composite aircraft wings

机译：粘弹性复合材料飞机机翼的颤振时间到了

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Many general aviation aircraft and commercial aviation aircraft are manufactured from high-polymer composite materials. The increasing use of polymer composite materials adds a time dimension to existing flutter analyses of an aircraft wing. Polymer composites exhibit viscoelastic material behaviors such as energy dissipation and a memory effect that influence the physical response of a wing. The proposed theory, derived from Lyapunov stability principles, predicts the time component of flutter, and provides a set of conditions for viscoelastic structural instabilities in general. The addition of the load history in the stability analysis of a structure is a significant change compared to elastic materials, and no standards exist for assessing the lifetime stability of a viscoelastic structure. Rigorous comparisons to the Goland wing, wings with and without stores, and a flying wing illustrate the practical applications of the theory during aircraft design. Further, the theory predicts the time to flutter of each wing for a range of representative viscoelastic materials and flow conditions. The existence and prediction of the time to flutter is the key, original contribution of the theory because no other method is available to predict the time to flutter. (C) 2016 Elsevier Ltd. All rights reserved.
机译：许多通用航空飞机和商用航空飞机都是由高聚物复合材料制成的。聚合物复合材料使用的增加为飞机机翼的现有颤振分析增加了时间维度。聚合物复合材料表现出粘弹性材料的行为，例如能量耗散和影响机翼物理响应的记忆效应。拟议的理论源于Lyapunov稳定性原理，预测了颤振的时间分量，并为粘弹性结构的不稳定性提供了一组条件。与弹性材料相比，在结构的稳定性分析中添加载荷历史记录是一个重大变化，并且不存在用于评估粘弹性结构的寿命稳定性的标准。与Goland机翼，带和不带机翼的机翼以及飞行机翼进行了严格的比较，说明了该理论在飞机设计中的实际应用。此外，该理论预测了一系列代表性粘弹性材料和流动条件下每个机翼颤振的时间。颤动时间的存在和预测是该理论的关键，原始贡献，因为没有其他方法可用来预测颤动时间。 （C）2016 Elsevier Ltd.保留所有权利。

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