Drag Coefficient Characterization of the Origami Magic Ball
Drag Coefficient Characterization of the Origami Magic Ball
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DOI：
10.1115/detc2023-117182
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
Guanyu Chen;Dongsheng Chen;Jessica Weakly;C. Sung
中科院分区：
文献类型：
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作者：
Guanyu Chen;Dongsheng Chen;Jessica Weakly;C. Sung
阻力系数在流体中移动的机器人的设计和优化中起着至关重要的作用。从飞机到水下航行器，它们的几何形状都经过专门设计，使阻力系数尽可能低，以实现节能性能。折纸魔球是由重复的简单水弹单元组成的 3 维可重构几何形状。它们的体积会随着几何形状的变化而变化，我们在最近的水下机器人设计中使用了这个概念。本文描述了折纸魔球在风洞中的阻力系数。通过量纲分析，将机器人在水下游泳的场景等价转移到风洞中的情况。通过实验，我们收集并分析了阻力数据。结果表明，随着魔球从细长椭球体形状转变为扁球体形状，其阻力系数从0.64左右增加到1.26。此外，与相同尺寸和长宽比的光滑几何形状相比，三种不同的魔法球的阻力系数平均增加了 57% 至 86%。研究结果将有助于未来在流体环境中使用水弹折纸的机器人设计。
The drag coefficient plays a vital role in the design and optimization of robots that move through fluids. From aircraft to underwater vehicles, their geometries are specially engineered so that the drag coefficients are as low as possible to achieve energy-efficient performances. Origami magic balls are 3-dimensional reconfigurable geometries composed of repeated simple water-bomb units. Their volumes can change as their geometries vary and we have used this concept in a recent underwater robot design. This paper characterizes the drag coefficient of an origami magic ball in a wind tunnel. Through dimensional analysis, the scenario where the robot swims underwater is equivalently transferred to the situation when it is in the wind tunnel. With experiments, we have collected and analyzed the drag force data. It is concluded that the drag coefficient of the magic ball increases from around 0.64 to 1.26 as it transforms from a slim ellipsoidal shape to an oblate spherical shape. Additionally, three different magic balls produce increases in the drag coefficient of between 57% and 86% on average compared to the smooth geometries of the same size and aspect ratio. The results will be useful in future designs of robots using waterbomb origami in fluidic environments.