Reduction of granular drag inspired by self-burrowing rotary seeds
Reduction of granular drag inspired by self-burrowing rotary seeds
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DOI：
10.1063/1.4979998
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发表时间：
2017-04-01
影响因子：
4.6
通讯作者：
Kim, Ho-Young
中科院分区：
文献类型：
--
作者：
Jung, Wonjong;Choi, Sung Mok;Kim, Ho-Young
我们提出了定量测量和数学分析的颗粒阻力减少旋转，作为动机的挖掘的Erodium和天竺葵种子。种子在发芽前利用其水分响应芒产生挖入土壤的运动，这些芒最初是螺旋形的，但在潮湿环境中可逆地变形为线性构型。我们发现，旋转大大降低了土壤对渗透的阻力，因为入侵者附近的晶粒重排改变了力链网络。我们找到了一个一般的相关性的阻力减少相对滑移，导致旋转入侵者的颗粒阻力的数学模型。除了阐明颗粒介质中旋转体的力学原理外，这项工作还可以指导我们设计在颗粒介质中工作的具有增强机动性的机器人。出版社：AIP Publishing
We present quantitative measurements and mathematical analysis of the granular drag reduction by rotation, as motivated by the digging of Erodium and Pelargonium seeds. The seeds create a motion to dig into soil before germination using their moisture-responsive awns, which are originally helical shaped but reversibly deform to a linear configuration in a humid environment. We show that the rotation greatly lowers the resistance of soil against penetration because grain rearrangements near the intruder change the force chain network. We find a general correlation for the drag reduction by relative slip, leading to a mathematical model for the granular drag of a rotating intruder. In addition to shedding light on the mechanics of a rotating body in granular media, this work can guide us to design robots working in granular media with enhanced maneuverability. Published by AIP Publishing.