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Globally stable control of a dynamic bipedal walker using adaptive frequency oscillators

Published online by Cambridge University Press:  15 January 2014

Gabriel Aguirre-Ollinger
Gabriel Aguirre-Ollinger*
Affiliation:
School of Electrical, Mechanical and Mechatronic Systems, University of Technology, Sydney, Broadway, NSW 2007, Australia
*
*Corresponding author. E-mail: gabriel.aguirre-ollinger@uts.edu.au.
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Summary

We present a control method for a simple limit-cycle bipedal walker that uses adaptive frequency oscillators (AFOs) to generate stable gaits. Existence of stable limit cycles is demonstrated with an inverted-pendulum model. This model predicts a proportional relationship between hip torque amplitude and stride frequency. The closed-loop walking control incorporates adaptive Fourier analysis to generate a uniform oscillator phase. Gait solutions (fixed points) are predicted via linearization of the walker model, and employed as initial conditions to generate exact solutions via simulation. Global stability is determined via a recursive algorithm that generates the approximate basin of attraction of a fixed point. We also present an initial study on the implementation of AFO-based control on a bipedal walker with realistic mass distribution and articulated knee joints.

Keywords

BipedsGait stabilityLimit-cycle walkersNonlinear oscillatorsBasin of attraction
Type
Articles
Information
Robotica , Volume 32 , Issue 7 , October 2014 , pp. 1039 - 1063
Copyright
Copyright © Cambridge University Press 2014 

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