[2017-Vol.14-Issue 2]Effects of Pendular Waist on Gecko's Climbing: Dynamic Gait, Analytical Model and Bio-inspired Robot
Time: 2017-04-26 11:20  Click:129

Volume 14, Issue 2, April 2017, Pages 191–201

  • a Robotics Institute, Beihang University, Beijing 100191, China
  • b CRRC Qingdao Sifang Co., Ltd., Qingdao 266111, China
  • Abstract

    Most quadruped reptiles, such as lizards, salamanders and crocodiles, swing their waists while climbing on horizontal or vertical surfaces. Accompanied by body movement, the centroid trajectory also becomes more of a zigzag path rather than a straight line. Inspired by gecko's gait and posture on a vertical surface, a gecko inspired model with one pendular waist and four active axil legs, which is called GPL model, is proposed. Relationship between the waist position, dynamic gait, and driving forces on supporting feet is analyzed. As for waist trajectory planning, a singular line between the supporting feet is found and its effects on driving forces are discussed. Based on the GPL model, it is found that a sinusoidal waist trajectory, rather than a straight line, makes the driving forces on the supporting legs smaller. Also, a waist close to the pygal can reduce the driving forces compared to the one near middle vertebration, which is in accord with gecko's body bending in the process of climbing. The principles of configuration design and gait planning are proposed based on theoretical analyses. Finally, a bio-inspired robot DracoBot is developed and both of the driving force measurements and climbing experiments reinforce theoretical analysis and the rationality of gecko's dynamic gait.

    Keywords

    • multi-legged robot
    • wall-climbing robot
    • dynamic gait
    • pendular waist
    • GPL model
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    Full text is available at http://www.sciencedirect.com/science/article/pii/S1672652917300021
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