Importance of body rotation during the flight of a butterfly
Importance of body rotation during the flight of a butterfly
复制标题
DOI：
10.1103/physreve.93.033124
复制
发表时间：
2016-03-25
影响因子：
2.4
通讯作者：
Yang, Jing-Tang
中科院分区：
文献类型：
--
作者：
Fei, Yueh-Han John;Yang, Jing-Tang
在自然界中，蝴蝶的身体运动被清楚地观察到包括周期性的旋转和不同的飞行模式。蝴蝶在飞行中的动作是独一无二的。基于自由飞行中记录的蝴蝶（Kallima inachus）的飞行运动，建立了蝴蝶的数值模型，研究其飞行与身体姿势的关系;在不同的初始身体角度和旋转幅度下，规定并测试了模拟中的身体运动。蝴蝶通过旋转身体来控制扑翼飞行过程中产生的涡环的方向，其飞行模式与蝴蝶的身体运动密切相关。当初始身体角度增加时，在一个行程内向前位移减小，但向上位移增加。随着旋转幅度的增加，由蝴蝶产生的射流向下喷射得更多，并进一步增强向上力的产生，根据向上力，蝴蝶在下冲程结束时执行垂直跳跃。在这个跳跃阶段，相对于蝴蝶的空气向下移动;蝴蝶向上仰起身体以平行于流动并减少投影面积，以避免产生进一步的向下力。我们的研究结果表明身体运动的蝴蝶在飞行中的重要性。从蝴蝶的飞行中获得的用身体运动控制飞行的灵感可能会产生一种控制未来飞行器的替代方法。
In nature the body motion of a butterfly is clearly observed to involve periodic rotation and varied flight modes. The maneuvers of a butterfly in flight are unique. Based on the flight motion of butterflies (Kallima inachus) recorded in free flight, a numerical model of a butterfly is created to study how its flight relates to body pose; the body motion in a simulation is prescribed and tested with varied initial body angle and rotational amplitude. A butterfly rotates its body to control the direction of the vortex rings generated during flapping flight; the flight modes are found to be closely related to the body motion of a butterfly. When the initial body angle increases, the forward displacement decreases, but the upward displacement increases within a stroke. With increased rotational amplitudes, the jet flows generated by a butterfly eject more downward and further enhance the generation of upward force, according to which a butterfly executes a vertical jump at the end of the downstroke. During this jumping stage, the air relative to the butterfly is moving downward; the butterfly pitches up its body to be parallel to the flow and to decrease the projected area so as to avoid further downward force generated. Our results indicate the importance of the body motion of a butterfly in flight. The inspiration of flight controlled with body motion from the flight of a butterfly might yield an alternative way to control future flight vehicles.