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Limb stiffness improvement of the Robot WAREC-1R for a Faster and Stable New Ladder Climbing gait

Journal of Bionic Engineering 2023年第1期20卷 57-68页

作者： Xiao Sun Akira Ito Takashi Matsuzawa Atsuo Takanishi Department of Mechatronics University of YamanashiYamanashi400-8511Japan Faculty of Science and Engineering Waseda UniversityTokyo162-8480Japan

Ladder climbing is a relatively new but practical locomotion style for robots. Unfortunately, due to their size and weight, ladder climbing by human-sized robots developed so far is struggling with the speedup of ladder climbing motion itself. Therefore, in this paper, a new ladder climbing gait for the robot WAREC-1R is proposed by the authors, which is both faster than the former ones and stable. However, to realize such a gait, a point that has to be taken into consideration is the deformation caused by the self-weight of the robot. To deal with this issue, extra hardware (sensor) and software (position and force control) systems and extra time for sensing and calculation were required. For a complete solution without any complicated systems and time only for deformation compensation, limb stiffness improvement plan by the minimal design change of mechanical parts of the robot is also proposed by the authors, with a thorough study about deformation distribution in the robot. With redesigned parts, ladder climbing experiments by WAREC-1R proved that both the new ladder climbing gait and the limb stiffness improvement are successful, and the reduced deformation is very close to the estimated value as well.

关键词： Ladder climbing Legged robot Bionic robot gait.stiffness improvement Finite element analysis

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