执行机构
灵活性(工程)
锥面
曲率
弯曲
软机器人
机械工程
工程类
八达通(软件)
结构工程
几何学
物理
电气工程
数学
量子力学
统计
作者
Zhexin Xie,August G. Domel,Ning An,Connor Green,Zizheng Gong,Tianmiao Wang,Elias Knubben,James C. Weaver,Katia Bertoldi,Li Wen
出处
期刊:Soft robotics
[Mary Ann Liebert]
日期:2020-10-01
卷期号:7 (5): 639-648
被引量:153
标识
DOI:10.1089/soro.2019.0082
摘要
Octopuses can employ their tapered arms to catch prey of all shapes and sizes due to their dexterity, flexibility, and gripping power. Intrigued by variability in arm taper angle between different octopus species, we explored the utility of designing soft actuators exhibiting a distinctive conical geometry, compared with more traditional cylindrical forms. We find that these octopus-inspired conical-shaped actuators exhibit a wide range of bending curvatures that can be tuned by simply altering their taper angle and they also demonstrate greater flexibility compared with their cylindrical counterparts. The taper angle and bending curvature are inversely related, whereas taper angle and applied bending force are directly related. To further expand the functionality of our soft actuators, we incorporated vacuum-actuated suckers into the actuators for the production of a fully integrated octopus arm-inspired gripper. Notably, our results reveal that because of their enhanced flexibility, these tapered actuators with suckers have better gripping power than their cylindrical-shaped counterparts and require significantly larger forces to be detached from both flat and curved surfaces. Finally, we show that by choosing appropriate taper angles, our tapered actuators with suckers can grip, move, and place a remarkably wide range of objects with flat, nonplanar, smooth, or rough surfaces, as well as retrieve objects through narrow openings. The results from this study not only provide new design insights into the creation of next-generation soft actuators for gripping a wide range of morphologically diverse objects but also contribute to our understanding of the functional significance of arm taper angle variability across octopus species.
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