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Research Article | Open Access

Use of opposite frictional forces by animals to increase their attachment reliability during movement

Zhouyi WANG1,2, Yi SONG1,3, Zhendong DAI1( )
Institute of Bio-inspired Structure and Surface Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Nanjing, 210016, China
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Nanjing, 210016, China
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Abstract

Many animals have the natural ability to move on various surfaces, such as those having different roughness and slope substrates, or even vertical walls and ceilings. Legged animals primarily attach to surfaces using claws, soft and hairy pads, or combinations of them. Recent studies have indicated that the frictional forces generated by these structures not only control the movement of animals but also significantly increase the reliability of their attachment. Moreover, the frictional forces of various animals have opposite characteristics and hierarchical properties from toe-to-toe and leg-to-leg. These opposite frictional forces allow animals to attach securely and stably during movement. The coordination of several attachment (adhesion) modes not only helps animals adhere, which would be impossible in single mode, but also increases the overall stability of the attachment (adhesion) system. These findings can help the design of highly adaptable feet for bionic robots in the near future.

Keywords

opposite frictional forcesclaw interlockssoft pad adhesionhairy pad adhesionattachment reliability

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Friction
Volume 1 Issue 2,
June 2013
Pages 143-149
DOI: 10.1007/s40544-013-0009-z
Cite this article:
WANG Z, SONG Y, DAI Z. Use of opposite frictional forces by animals to increase their attachment reliability during movement. Friction, 2013, 1(2): 143-149. https://doi.org/10.1007/s40544-013-0009-z

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Received: 08 January 2013
Revised: 04 March 2013
Accepted: 13 March 2013
Published: 13 June 2013
© The author(s) 2013

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distri- bution, and reproduction in any medium, provided the original author(s) and source are credited.
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