Generation of bipedal walking through interactions among the robot dynamics,the oscillator dynamics,and the environment: Stability characteristics of a five-link planar biped robot |
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Authors: | Shinya Aoi Kazuo Tsuchiya |
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Affiliation: | (1) Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan |
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Abstract: | We previously developed a locomotion control system for a biped robot using nonlinear oscillators and verified the performance
of this system in order to establish adaptive walking through the interactions among the robot dynamics, the oscillator dynamics,
and the environment. In order to clarify these mechanisms, we investigate the stability characteristics of walking using a
five-link planar biped robot with a torso and knee joints that has an internal oscillator with a stable limit cycle to generate
the joint motions. Herein we conduct numerical simulations and a stability analysis, where we analytically obtain approximate
periodic solutions and examine local stability using a Poincaré map. These analyses reveal (1) stability characteristics due
to locomotion speed, torso, and knee motion, (2) stability improvement due to the modulation of oscillator states based on
phase resetting using foot-contact information, and (3) the optimal parameter in the oscillator dynamics for adequately exploiting
the interactions among the robot dynamics, the oscillator dynamics, and the environment in order to increase walking stability.
The results of the present study demonstrate the advantage and usefulness of locomotion control using oscillators through
mutual interactions. |
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Keywords: | |
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