G
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
Twan Koolen,Sylvain Bertrand,Gray C. Thomas,Tomas De Boer,Tingfan Wu,Jesper Smith,Johannes Englsberger,Jerry Pratt +7 more
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.
Proceedings ArticleDOI
Summary of Team IHMC's virtual robotics challenge entry
Twan Koolen,Jesper Smith,Gray C. Thomas,Sylvain Bertrand,John Carff,Nathan Mertins,Douglas Stephen,Peter Abeles,Johannes Englsberger,Stephen McCrory,Jeff van Egmond,Maarten Griffioen,Marshall Floyd,Samantha Kobus,Nolan Manor,Sami Alsheikh,Daniel Duran,Larry Bunch,Eric Morphis,Luca Colasanto,Khai-Long Ho Hoang,Brooke Layton,Peter Neuhaus,Matthew D. Johnson,Jerry Pratt +24 more
TL;DR: The paper presents the approach, as well as a bird's-eye view of the major software components and their integration of Team IHMC to win the DARPA Virtual Robotics Challenge (VRC).
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.