Efficient Exploratory Learning of Inverse Kinematics on a Bionic Elephant Trunk
Matthias Rolf,Jochen J. Steil +1 more
172
TL;DR: This work presents an approach to learn the inverse kinematics of the “bionic handling assistant”-an elephant trunk robot, and provides the first functioning control concept for this challenging robot platform.
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Abstract: We present an approach to learn the inverse kinematics of the “bionic handling assistant”—an elephant trunk robot. This task comprises substantial challenges including high dimensionality, restrictive and unknown actuation ranges, and nonstationary system behavior. We use a recent exploration scheme, online goal babbling, which deals with these challenges by bootstrapping and adapting the inverse kinematics on the fly. We show the success of the method in extensive real-world experiments on the nonstationary robot, including a novel combination of learning and traditional feedback control. Simulations further investigate the impact of nonstationary actuation ranges, drifting sensors, and morphological changes. The experiments provide the first substantial quantitative real-world evidence for the success of goal-directed bootstrapping schemes, moreover with the challenge of nonstationary system behavior. We thereby provide the first functioning control concept for this challenging robot platform.
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