Abstract
A safe robot arm can be achieved by either a passive or active compliance system. A passive compliance system composed of purely mechanical elements often provide faster and more reliable responses for dynamic collision than an active one involving sensors and actuators. Since both positioning accuracy and collision safety are important, a robot arm should exhibit very low stiffness when subjected to a collision force greater than the one causing human injury, but maintain very high stiffness otherwise. To implement these requirements, a novel safe joint mechanism (SJM), which consists of linear springs and a slider-crank mechanism, is proposed in this research. The SJM has the advantages of variable stiffness which can be achieved only by passive mechanical elements. Various experiments of static and dynamic collisions showed the high stiffness of the SJM against an external force of less than the critical impact force, but an abrupt drop in the stiffness when the external force exceeds the critical force, thus guaranteeing collision safety. Furthermore, the critical impact force can be set to any value depending on the application.
Original language | English |
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Title of host publication | Recent Progress in Robotics |
Subtitle of host publication | Viable Robotic Service to Human |
Editors | Sukhan Lee, Il Hong Suh, Kim Mun Sang |
Pages | 49-61 |
Number of pages | 13 |
DOIs | |
Publication status | Published - 2008 |
Publication series
Name | Lecture Notes in Control and Information Sciences |
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Volume | 370 |
ISSN (Print) | 0170-8643 |
Bibliographical note
Funding Information:Acknowledgements. This research was supported by the Personal Robot Development Project funded by the Ministry of Commerce, Industry and Energy of Korea. fdgdfgfdgfd
ASJC Scopus subject areas
- Library and Information Sciences