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Effects of Pendular Waist on Gecko＇s Climbing： dynamic gait, Analytical Model and Bio-inspired Robot

Journal of Bionic Engineering 2017年第2期14卷 191-201页

作者： Wei Wang Xuepeng Li Shilin Wu Peihua Zhu Fei Zhao Robotics Institute Beihang University Beijing 100191 China CRRC Qingdao Sifang Co. Ltd. Qingdao 266111 China

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.

关键词： multi-legged robot wall-climbing robot dynamic gait pendular waist GPL model

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Bionic Quadruped Robot dynamic gait Control Strategy Based on Twenty Degrees of Freedom

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 382-388页

作者： Dawei Gong Peng Wang Shuangyu Zhao Li Du Yu Duan University of Electronic Science and Technology Chengdu 611731 China

Quadruped robot dynamic gaits have much more advantages than static gaits on speed and efficiency, however high speed and efficiency calls for more complex mechanical structure and complicated control algorithm. It becomes even more challenging when the robot has more degrees of *** a result, most of the present researches focused on simple robot, while the researches on dynamic gaits for complex robot with more degrees of freedom are relatively limited. The paper is focusing on the dynamic gaits control for complex robot with twenty degrees of freedom for the first time. Firstly, we build a relatively complete 3 D model for quadruped robot based on spring loaded inverted pendulum(SLIP) model, analyze the inverse kinematics of the model, plan the trajectory of the swing foot and analyze the hydraulic drive. Secondly, we promote the control algorithm of one-legged to the quadruped robot based on the virtual leg and plan the state variables of pace gait and bound gait. Lastly, we realize the above two kinds of dynamic gaits in ADAMS-MATLAB joint simulation platform which testify the validity of above method.

关键词： Degree of freedom dynamic gait foot trajectory quadruped robot spring loaded inverted pendulum(SLIP)

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