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Gait Regulation for Bipedal Locomotion

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Title: Gait Regulation for Bipedal Locomotion
Author(s): Holm, Jonathan K.
Doctoral Committee Chair(s): Spong, Mark W.
Doctoral Committee Member(s): Hsiao-Wecksler, Elizabeth T.; Hutchinson, Seth A.; Meyn, Sean P.
Department / Program: Electrical and Computer Engineering
Discipline: Electrical and Computer Engineering
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): biped robot passive walking passive-dynamic energy shaping optimal control
Abstract: This work explores regulation of forward speed, step length, and slope walking for the passive-dynamic class of bipedal robots. Previously, an energy-shaping control for regulating forward speed has appeared in the literature; here we show that control to be a special case of a more general time-scaling control that allows for speed transitions in arbitrary time. As prior work has focused on potential energy shaping for fully actuated bipeds, we study in detail the shaping of kinetic energy for bipedal robots, giving special treatment to issues of underactuation. Drawing inspiration from features of human walking, an underactuated kinetic-shaping control is presented that provides efficient regulation of walking speed while adjusting step length. Previous results on energetic symmetries of bipedal walking are also extended, resulting in a control that allows regulation of speed and step length while walking on any slope. Finally we formalize the optimal gait regulation problem and propose a dynamic programming solution seeded with passive-dynamic limit cycles. Observations of the optimal solutions generated by this method reveal further similarities between passive dynamic walking and human locomotion and give insight into the structure of minimum-effort controls for walking.
Issue Date: 2008-08-13
Citation Info: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical and Computer Engineering in the Graduate College of the University of Illinois at Urbana-Champaign, 2008.
Genre: Dissertation / Thesis
Type: ImageText
Language: English
Publication Status: unpublished
Peer Reviewed: is peer reviewed
Rights Information: Copyright 2008 Jonathan K. Holm
Date Available in IDEALS: 2008-08-13

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