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Gray C. Thomas

Researcher at University of Michigan

Publications -  48
Citations -  584

Gray C. Thomas is an academic researcher from University of Michigan. The author has contributed to research in topics: Exoskeleton & Control theory. The author has an hindex of 7, co-authored 40 publications receiving 442 citations. Previous affiliations of Gray C. Thomas include Franklin W. Olin College of Engineering & Shandong University.

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Journal ArticleDOI

Design of a Momentum-Based Control Framework and Application to the Humanoid Robot Atlas

TL;DR: A momentum-based control framework for floating-base robots and its application to the humanoid robot “Atlas” is presented and results for walking across rough terrain, basic manipulation, and multi-contact balancing on sloped surfaces are presented.
Journal ArticleDOI

Stabilizing Series-Elastic Point-Foot Bipeds Using Whole-Body Operational Space Control

TL;DR: This paper formulate a WBOSC for point-foot bipeds with series-elastic actuators (SEA) and experiment with it using a teen-size SEA biped robot and experimentally validate the efficacy of the new whole-body control and planning strategies via balancing over a disjointed terrain and attaining dynamic balance through continuous stepping without a mechanical support.
Proceedings ArticleDOI

Modeling and Loop Shaping of Single-Joint Amplification Exoskeleton with Contact Sensing and Series Elastic Actuation

TL;DR: In this article, a linear feedback compensator is designed to attenuate the feedback of the exoskeleton's reflected dynamics at frequencies within the bandwidth of the control. But the compensator was designed to be robust to both a realistic variation in human impedance and a large variation in load impedance.
Proceedings ArticleDOI

Continuous cyclic stepping on 3D point-foot biped robots via constant time to velocity reversal

TL;DR: This paper presents a control scheme for ensuring that a 3D, under-actuated, point-foot biped robot remains balanced while walking by observing the center of mass (COM) position error relative to a reference path and re-planning a new reference trajectory to remove this error at every step.