Safe joint mechanism using inclined link with springs for collision safety and positioning accuracy of a robot arm

Jung Jun Park, Jae-Bok Song

Research output: Chapter in Book/Report/Conference proceedingConference contribution

31 Citations (Scopus)

Abstract

In recent years, the potential for collision between humans and robots has drawn much attention since service robots are increasingly being used in the human environment. A safe robot arm can be achieved using either an active or passive compliance method. A passive compliance system composed of purely mechanical elements often provides faster and more reliable responses to dynamic collision than an active system involving sensors and actuators. Since positioning accuracy and collision safety of a robot arm are equally important, a robot arm should have very low stiffness when subjected to a collision force capable of causing human injury. Otherwise, it should maintain a very high stiffness. To implement these requirements, a novel safe joint mechanism (SJM-III) consisting of an inclined link, a slider with rollers, and linear springs is proposed. The SJM-III has the advantage of nonlinear stiffness, which can be achieved only with passive mechanical elements. Various analyses and experiments on static and dynamic collisions show high stiffness of the SJM-III against an external torque less than a predetermined threshold torque, with an abrupt drop in stiffness when the external torque exceeds this threshold. The safe joint mechanism enables a robot manipulator to guarantee positioning accuracy and collision safety, and which is simple to install between an actuator and a robot link without a significant change in the robot's design.

Original languageEnglish
Title of host publicationProceedings - IEEE International Conference on Robotics and Automation
Pages813-818
Number of pages6
DOIs
Publication statusPublished - 2010 Aug 26
Event2010 IEEE International Conference on Robotics and Automation, ICRA 2010 - Anchorage, AK, United States
Duration: 2010 May 32010 May 7

Other

Other2010 IEEE International Conference on Robotics and Automation, ICRA 2010
CountryUnited States
CityAnchorage, AK
Period10/5/310/5/7

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ASJC Scopus subject areas

  • Software
  • Artificial Intelligence
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

Park, J. J., & Song, J-B. (2010). Safe joint mechanism using inclined link with springs for collision safety and positioning accuracy of a robot arm. In Proceedings - IEEE International Conference on Robotics and Automation (pp. 813-818). [5509492] https://doi.org/10.1109/ROBOT.2010.5509492