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arXiv 2404.09644cs.RO
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一种用于提升机器人抓手灵巧性的折纸启发式可变摩擦表面

An Origami-Inspired Variable Friction Surface for Increasing the Dexterity of Robotic Grippers

Imperial College London(伦敦帝国学院);Dyson School of Design Engineering(戴森设计工程学院)

Qiujie Lu, Angus B. Clark, Matthew Shen, Nicolas Rojas

AI总结:

针对机器人抓手手部内操控能力受限的问题,提出一种可切换高低摩擦状态的折纸启发式参数化薄型表面,经数值分析和实验验证,该表面能稳定提升抓手操控性能,图案密度和谷间距是关键影响参数。

摘要:

尽管机器人抓手的抓取能力已取得显著进展,但在手部内部操控物体的能力仍然有限。造成这一局限的一个原因是被抓取物体与抓手之间缺乏可控的接触变化。例如,人类的手既能牢牢握住物体表面,也能在物体表面滑动,这一特性有助于在不失去接触的情况下增强手部对物体的操控能力。在这篇论文中,我们提出了一种参数化的、受折纸启发的薄型表面,它能够在高摩擦状态与低摩擦状态之间切换,适合作为机器人手指的表皮使用。我们基于该表面的设计参数、受力分析以及在手部内部操控任务中的性能,开展了数值分析。通过开发一款采用了不同参数的所提可变摩擦表面的简单两指两自由度抓手,我们通过实验证明:与无可变摩擦功能的同款抓手相比,该抓手的操控能力得到了提升。结果表明,图案密度和谷间距是影响手部内部操控性能的主要参数。具有更高图案密度的折纸启发式薄型表面会产生更小的谷间距和更小的高度变化,从而更稳定地提升手部的操控能力。

英文摘要:

While the grasping capability of robotic grippers has shown significant development, the ability to manipulate objects within the hand is still limited. One explanation for this limitation is the lack of controlled contact variation between the grasped object and the gripper. For instance, human hands have the ability to firmly grip object surfaces, as well as slide over object faces, an aspect that aids the enhanced manipulation of objects within the hand without losing contact. In this letter, we present a parametric, origami-inspired thin surface capable of transitioning between a high friction and a low friction state, suitable for implementation as an epidermis in robotic fingers. A numerical analysis of the proposed surface based on its design parameters, force analysis, and performance in in-hand manipulation tasks is presented. Through the development of a simple two-fingered two-degree-of-freedom gripper utilizing the proposed variable-friction surfaces with different parameters, we experimentally demonstrate the improved manipulation capabilities of the hand when compared to the same gripper without changeable friction. Results show that the pattern density and valley gap are the main parameters that effect the in-hand manipulation performance. The origami-inspired thin surface with a higher pattern density generated a smaller valley gap and smaller height change, producing a more stable improvement of the manipulation capabilities of the hand.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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