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Human-mimetic soft robot joint for shock absorption through joint dislocation.

Yong-Sin Seo1, Seong J Cho, Jae-Young Lee

  • 1Department of Robotics and Mechatronics, Korea Institute of Machinery and Materials, Daejeon 34103, Republic of Korea. School of Mechanical Engineering, Chungnam National University, Daejeon 34134, Republic of Korea. Both authors contributed equally to this work.

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|September 24, 2019
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Summary
This summary is machine-generated.

This study introduces a human-mimetic soft robot joint that absorbs shock through a controlled dislocation mechanism, inspired by human joints. This innovation enhances safety for humanoid robots working alongside people.

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Area of Science:

  • Robotics
  • Biomechanics
  • Materials Science

Background:

  • Humanoid robots require advanced safety features for human interaction.
  • Existing robotic joints lack natural shock absorption capabilities.
  • Human joints exhibit resilience through mechanisms like dislocation.

Purpose of the Study:

  • To develop a human-mimetic soft robot joint with shock absorption.
  • To mimic the dislocation mechanism of human joints for impact mitigation.
  • To create a 2-DOF manipulator for human arm motion replication.

Main Methods:

  • Designed a one degree-of-freedom (DOF) soft robot joint using elastic ligaments and a pivot pin.
  • Developed a theoretical model to predict dislocation threshold force.
  • Conducted dynamic and quasi-static impact tests on the soft joint.
  • Integrated the soft joint into a 2-DOF manipulator using pneumatic artificial muscles.

Main Results:

  • The soft robot joint successfully demonstrated dislocation to absorb external impacts.
  • Dislocation occurred above a predictable threshold force, dependent on material properties and design.
  • The 2-DOF manipulator replicated human arm movements (flexion, extension, pronation, supination).

Conclusions:

  • The developed human-mimetic soft joint effectively absorbs shock via controlled dislocation.
  • The proposed manipulator offers human-like arm motion and enhanced safety.
  • This technology is promising for developing safer humanoid robots for human-robot collaboration.