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Coupled and decoupled actuation of robotic mechanisms

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Abstract:

In this paper, we describe two types of seemingly opposing design and control concepts for the realization of a high performance robotic system. One of them is the coupled drive. It is a design and control strategy to maximize the output power of the robotic system by actively coupling the drive of installed actuators. We show two design examples of the coupled drive - design of a leg mechanism and gait control of the wall-climbing robot NINJA-II, and design of a multi-degrees-offreedom manipulator CT-Arm. Another is the gravitationally decoupled actuation (GDA). This is a design and control strategy to maximize energy efficiency of a robotic system by means of decoupled drive of the installed actuators. We show two design examples based on the GDA - design of leg mechanism and control of quadruped walking robots. In the final part of the paper, we discuss a methodology to merge the two above-mentioned seemingly contradictory design methods and apply the merged concept to posture control of a walking robot on a three-dimensional terrain.

Keywords: ACTUATION INDEX; COUPLED DRIVE; GDA; NINJA-II; TITAN-III

Document Type: Review Article

DOI: http://dx.doi.org/10.1163/15685530152116191

Affiliations: Tokyo Institute of Technology, 2-12-1 Oo-okayama, Meguro-ku, Tokyo 152-8552, Japan

Publication date: June 1, 2001

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