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Toward the Control of a Multi-Jointed, Monoped Runner

Uluc Saranli, University of Michigan
William J. Schwind, University of Michigan
Daniel E. Koditschek, University of Pennsylvania

Article comments

Copyright 1998 IEEE. Reprinted from Proceedings of the IEEE International Conference on Robotics and Automation, Volume 3, 1998, pages 2676-2682.

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NOTE: At the time of publication, author Daniel Koditschek was affiliated with the University of Michigan. Currently, he is a faculty member in the Department of Electrical and Systems Engineering at the University of Pennsylvania.

Abstract

We propose a new family of controllers for multi-jointed planar monoped runners, based on approximate but accurate models of the stance phase dynamics of a two degree of freedom "SLIP" leg. Unlike previous approaches, the new scheme gives control over all parameters of the system including the hopping height, forward speed and duty cycle. The control laws are "deadbeat" in nature, derived by computing the inverse of an approximate return map and corrected by integral compensation. We use the expressions obtained in this way to control the original SLIP leg as well as radically different, more realistic four degree of freedom legs. In each case, the performance of the deadbeat scheme in controlling forward running velocity is compared to a modified Raibert control strategy, whose experimental stability properties have been analyzed carefully in the low degree of freedom setting.

Suggested Citation

Uluc Saranli, William J. Schwind, and Daniel E. Koditschek. "Toward the Control of a Multi-Jointed, Monoped Runner" Departmental Papers (ESE) (1998).
Available at: http://works.bepress.com/daniel_koditschek/69