The effect of folding wingtips on the worst-case gust loads of a simplified aircraft model
The effect of folding wingtips on the worst-case gust loads of a simplified aircraft model
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DOI：
10.1177/09544100211010915
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
Davide Balatti;H. Haddad Khodaparast;M. Friswell;M. Manolesos;M. Amoozgar
中科院分区：
文献类型：
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作者：
Davide Balatti;H. Haddad Khodaparast;M. Friswell;M. Manolesos;M. Amoozgar
近年来，更轻和更有效的运输机的发展导致了阵风载荷减缓的关注增加。最近的一种策略是基于使用折叠式翼尖装置，该装置增加展弦比，从而改善飞机性能。此外，数值研究表明，这种折叠翼尖解决方案可以包括弹簧装置，以便在飞行中提供额外的阵风载荷减缓能力。结果表明，翼尖质量、刚度连接和铰链方向是避免阵风颤振和实现载荷减缓的关键参数。这项工作的目的是显示气动弹性铰链翼尖对最坏情况阵风预测问题的影响，以及针对这一特定问题，即最坏情况阵风载荷预测的这种模型的参数化和优化。本文建立了带有刚性活动翼尖的全对称飞机的简化气动弹性模型。铰链的位置，方向和弹簧刚度的影响被认为是为了评估该技术的阵风载荷缓解的性能。此外，还研究了带有弹性机翼和折叠翼尖的刚性飞机的纵向飞行动力学。采用遗传算法进行多目标优化，以利用翼尖参数的最佳组合，使整个飞行包线的阵风响应最小化，同时保持颤振速度在安全裕度内。提出了两种基于翼尖参数修正的颤振增速策略。
In recent years, the development of lighter and more efficient transport aircraft has led to an increased focus on gust load alleviation. A recent strategy is based on the use of folding wingtip devices that increase the aspect ratio and therefore improve the aircraft performance. Moreover, numerical studies have suggested such a folding wingtip solution may incorporate spring devices in order to provide additional gust load alleviation ability in flight. It has been shown that wingtip mass, stiffness connection and hinge orientation are key parameters to avoid flutter and achieve load alleviation during gusts. The objective of this work is to show the effects of aeroelastic hinged wingtip on the problem of worst-case gust prediction and the parameterization and optimization of such a model for this particular problem, that is, worst-case gust load prediction. In this article, a simplified aeroelastic model of full symmetric aircraft with rigid movable wingtips is developed. The effects of hinge position, orientation and spring stiffness are considered in order to evaluate the performance of this technique for gust load alleviation. In addition, the longitudinal flight dynamics of a rigid aircraft with an elastic wing and folding wingtips is studied. Multi-objective optimizations are performed using a genetic algorithm to exploit the optimal combinations of the wingtip parameters that minimize the gust response for the whole flight envelope while keeping flutter speed within the safety margin. Two strategies to increase flutter speed based on the modification of the wingtip parameters are presented.