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The International Journal of Robotics Research
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Experiments in Balance with a 3D One-Legged Hopping Machine

Marc H. Raibert

Department of Computer Science and The Robotics Institute Carnegie-Mellon University Pittsburgh, Pennsylvania 15213

H. Benjamin Brown, Jr

Department of Computer Science and The Robotics Institute Carnegie-Mellon University Pittsburgh, Pennsylvania 15213

Michael Chepponis

Department of Computer Science and The Robotics Institute Carnegie-Mellon University Pittsburgh, Pennsylvania 15213

In order to explore the balance in legged locomotion, we are studying systems that hop and run on one springy leg. Pre vious work has shown that relatively simple algorithms can achieve balance on one leg for the special case of a system that is constrained mechanically to operate in a plane (Rai bert, in press; Raibert and Brown, in press). Here we general ize the approach to a three-dimensional (3D) one-legged machine that runs and balances on an open floor without physical support. We decompose control of the machine into three separate parts: one part that controls forward running velocity, one part that controls attitude of the body, and a third part that controls hopping height. Experiments with a physical 3D one-legged hopping machine showed that this control scheme, while simple to implement, is powerful enough to permit hopping in place, running at a desired rate, and travel along a simple path. These algorithms that control locomotion in 3D are direct generalizations of those in 2D, with surprisingly little additional complication.

The International Journal of Robotics Research, Vol. 3, No. 2, 75-92 (1984)
DOI: 10.1177/027836498400300207
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