How flight feathers stick together to form a continuous morphing wing
How flight feathers stick together to form a continuous morphing wing
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DOI：
10.1126/science.aaz3358
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发表时间：
2020-01-17
期刊：
影响因子：
56.9
通讯作者：
Lentink, David
中科院分区：
文献类型：
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作者：
Matloff, Laura Y.;Chang, Eric;Lentink, David
可变的羽毛重叠使鸟类能够改变他们的翅膀，不像飞机。它们通过结缔组织的弹性顺应性来完成这一壮举，当骨架移动以改变翅膀平面形状时，结缔组织被动地重新分配重叠的飞羽。“这样当相邻的羽毛在伸展过程中分开时，重叠羽毛上的数千个叶状纤毛可能会与重叠羽毛的钩状分支锁定，以防止间隙。”这些结构在屈曲过程中自动解锁。使用羽毛的生物混合空中机器人，我们演示了如何两个被动机制使变形的翅膀强大的湍流。我们发现，除了沉默的飞行者之外，钩状的微结构将鸟类的羽毛固定在一起，它们的羽毛也缺乏相关的维可牢尼龙搭扣般的噪音。这些发现可以激发创新的定向紧固件和变形飞机
Variable feather overlap enables birds to morph their wings, unlike aircraft. They accomplish this feat by means of elastic compliance of connective tissue, which passively redistributes the overlapping flight feathers when the skeleton moves to morph the wing planform, Distinctive microstructures form "directional Velcro." such that when adjacent feathers slide apart during extension, thousands of lobate cilia on the underlapping feathers lock probabilistically with hooked rami of overlapping feathers to prevent gaps. These structures unlock automatically during flexion. Using a feathered biohybrid aerial robot, we demonstrate how both passive mechanisms make morphing wings robust to turbulence. We found that the hooked microstructures fasten feathers across bird species except silent fliers, whose feathers also lack the associated Velcro-like noise. These findings could inspire innovative directional fasteners and morphing aircraft