"Use of opposite frictional forces by animals to increase their attachm" by Zhouyi WANG, Yi SONG et al.

Article Title

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

Authors

Zhouyi WANG, 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
Yi SONG, Institute of Bio-inspired Structure and Surface Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Nanjing, 210016, China
Zhendong DAI, Institute of Bio-inspired Structure and Surface Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

Keywords

opposite frictional forces, claw interlocks, soft pad adhesion, hairy pad adhesion, attachment reliability

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.

DOI

https://doi.org/10.1007/s40544-013-0009-z

Publisher

Tsinghua University Press

Recommended Citation

Zhouyi WANG, Yi SONG, Zhendong DAI. Use of opposite frictional forces by animals to increase their attachment reliability during movement. Friction 2013, 1(2): 143-149.

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