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2024
Journal and Conference Papers and Dissertations
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L. Amanzadeh, T. Chunawala, R. T. Fawcett, A. Leonessa, and K. Akbari Hamed, "Predictive control with indirect adaptive laws for payload transportation by quadrupedal robots," IEEE Robotics and Automation Letters, Under Review, Revised, August 2024 (video)
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B. M. Imran, R. T. Fawcett, J. Kim, A. Leonessa, and K. Akbari Hamed, "A distributed layered planning and control algorithm of quadrupedal robots: An obstacle-aware nonlinear MPC approach," ASME Journal of Dynamic Systems, Measurement, and Control, Accepted to Appear, September 2024 (video)
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A. Pandala, A. D. Ames, and K. Akbari Hamed, “H2- and H-infinity-optimal model predictive controllers for robust legged locomotion,” IEEE Open Journal of Control Systems, vol. 3, pp. 225-238, May 2024 (see) (video)
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K. Li, J. Kim, X. Xiong, K. Akbari Hamed, Y. Yue, and A. D. Ames, “Data-driven predictive control for robust exoskeleton locomotion,” IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Accepted to Appear, June 2024 (see)
2023
Journal and Conference Papers and Dissertations
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R. T. Fawcett, A. D. Ames, and K. Akbari Hamed, “Distributed planning of collaborative locomotion: A physics-based and data-driven approach,” IEEE Access, vol. 11, pp. 128369-128382, November 2023 (see) (video)
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J. Kim, R. T. Fawcett, V. R. Kamidi, A. D. Ames, and K. Akbari Hamed, “Layered control for cooperative locomotion of two quadrupedal robots: Centralized and distributed approaches,” IEEE Transactions on Robotics, vol. 39, no. 6, pp. 4728-4748, December 2023 (see) (video)
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R. T. Fawcett, L. Amanzadeh, J. Kim, A. D. Ames, and K. Akbari Hamed, “Distributed data-driven predictive control for multi-agent collaborative legged locomotion,” IEEE International Conference on Robotics and Automation (ICRA), pp. 9924-9930, London, UK, June 2023 (see) (video) [Outstanding Paper Award of the 2023 ICRA]
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S. Halder, K. Afsari, E. Chiou, R. Patrick, and K. Akbari Hamed, “Construction inspection & monitoring with quadruped robots in future human-robot teaming: A preliminary study,” Journal of Building Engineering, vol. 65, pp. 105814, April 2023 (see)
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A. Pandala, Robust Predictive Control for Legged Locomotion, Advisor: K. Akbari Hamed, Ph.D. Dissertation, Mechanical Engineering, Virginia Tech, December 2023 (see)
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R. T. Fawcett, Hierarchical Control of Constrained Multi-Agent Legged Locomotion: A Data-Driven Approach, Ph.D. Dissertation, Advisor: K. Akbari Hamed, Mechanical Engineering, Virginia Tech, May 2023 (see)
2022
Journal and Conference Papers and Dissertations
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R. T. Fawcett, K. Afsari, A. D. Ames, and K. Akbari Hamed, “Toward a data-driven template model for quadrupedal locomotion,” IEEE Robotics and Automation Letters, vol. 7, issue 3, pp. 7636-7643, July 2022 (see) (video) (presentation for the IROS 2022)
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A. Pandala, R. T. Fawcett, U. Rosolia, A. D. Ames, and K. Akbari Hamed, “Robust predictive control for quadrupedal locomotion: Learning to close the gap between reduced- and full-order models,” IEEE Robotics and Automation Letters, vol. 7, issue 3, pp. 6622-6629, July 2022 (see) (video) (presentation video for IROS 2022)
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V. R. Kamidi, J. Kim, R. T. Fawcett, A. D. Ames, and K. Akbari Hamed, “Distributed quadratic programming-based nonlinear controllers for periodic gaits of legged locomotion, ” IEEE Control Systems Letters, vol. 6, pp. 2509-2514, April 2022 (see) (video) (presentation video for CDC 2022)
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J. Kim, Collaborative Locomotion of Quadrupedal Robots: From Centralized Predictive Control to Distributed Control, Ph.D. Dissertation, Advisor: K. Akbari Hamed, Mechanical Engineering, Virginia Tech, August 2022 (see)
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V. R. Kamidi, Distributed Feedback Control Algorithms for Cooperative Locomotion: From Bipedal to Quadrupedal Robots, Ph.D. Dissertation, Advisor: K. Akbari Hamed, Mechanical Engineering, Virginia Tech, March 2022 (see)
2021
Journal and Conference Papers and Dissertations
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R. T. Fawcett, A. Pandala, A. D. Ames, and K. Akbari Hamed, "Robust stabilization of periodic gaits for quadrupedal locomotion via QP-based virtual constraint controllers," IEEE Control Systems Letters, pp. 1736-1741, December 2021 (see) (video)
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J. Kim and K. Akbari Hamed, "Cooperative locomotion via supervisory predictive control and distributed nonlinear controllers,'' ASME Journal of Dynamics Systems, Measurement, and Control, 144(3), 031005, December 2021 (see)(animation)
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W. Ma, N. Csomay-Shanklin, S. Kolathaya, K. Akbari Hamed, and A. D. Ames, "Coupled control Lyapunov functions for interconnected systems, with application to quadrupedal locomotion," IEEE Robotics and Automation Letters, vol. 6, issue 2, April 2021 (see)
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V. R. Kamidi, J. C. Horn, R. D. Gregg, and K. Akbari Hamed, "Distributed controllers for human-robot locomotion: A scalable approach based on decomposition and hybrid zero dynamics,'' IEEE Control Systems Letters, vol. 6, issue 5, December 2021 (see) (animation)
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R. T. Fawcett, Real-Time Planning and Nonlinear Control for Robust Quadrupedal Locomotion with Tails, MS Thesis, Advisor: K. Akbari Hamed, Virginia Tech, July 2021 (see) (video)
2020
Journal and Conference Papers and Dissertations
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R. T. Fawcett, A. Pandala, J. Kim, and K. Akbari Hamed, "Real-time planning and nonlinear control for quadrupedal locomotion with articulated tails,'' ASME Journal of Dynamic Systems, Measurement, and Control, 143(7), 071004, February 2021 (see) [2022 ASME Dynamic Systems & Control Division Rudolf Kalman Best Paper Award]
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K. Akbari Hamed, J. Kim, and A. Pandala, "Quadrupedal locomotion via event-based predictive control and QP-based virtual constraints,'' IEEE Robotics and Automation Letters, vol.. 5, no. 3, pp. 4463-4470, July 2020 (see) (animation)
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J. C. Horn, A. Mohammadi, K. Akbari Hamed, R. D. Gregg, "Nonholonomic virtual constraint design for variable-incline bipedal robotic walking,'' IEEE Robotics and Automation Letters, vol. 5, issue 2, pp. 3691-3698, April 2020 (see)
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K. Akbari Hamed, V. R. Kamidi, A. Pandala, W. Ma, and A. D. Ames, “Distributed feedback controllers for stable cooperative locomotion of quadrupedal robots: A virtual constraint approach,” American Control Conference (ACC), Denver, CO, pp. 5314-5321, July 2020 (see) (animation)
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A. Pandala, V. R. Kamidi, and K. Akbari Hamed, “Decentralized control schemes for stable quadrupedal locomotion: A decomposition approach from centralized controllers,” IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 3975-3981, Las Vegas, NV, October 2020 (see)
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J. Martin, V. R. Kamidi, A. Pandala, R. Fawcett, and K. Akbari Hamed, “Exponentially stabilizing and time-varying virtual constraint controllers for dynamic quadrupedal bounding,” IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 3914-3921, Las Vegas, NV, October 2020 (see)
2019
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, V. R. Kamidi, W. Ma, A. Leonessa, and A. D. Ames, “Hierarchical and safe motion control for cooperative locomotion of robotic guide dogs and humans: A hybrid systems approach,” IEEE Robotics and Automation Letters, pp. 56-63, September 2019, (see) (animation)
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K. Akbari Hamed and A. D. Ames, “Nonholonomic hybrid zero dynamics for the stabilization of periodic orbits: Application to underactuated robotic walking,” IEEE Transactions on Control Systems Technology, In Press, October 2019 (see) (animation)
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K. Akbari Hamed, B. Safaee, and R. D. Gregg, "Dynamic output controllers for exponential stabilization of periodic orbits for multi-domain hybrid models of robotic locomotion," ASME Journal of Dynamic Systems, Measurement, and Control, vol. 141, 121011-1-121011-15, December 2019 (see) (animation)
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J. C. Horn, A. Mohammadi, K. Akbari Hamed, and R. D. Gregg, “Hybrid zero dynamics of bipedal robots under nonholonomic constraints," IEEE Control Systems Letters, vol. 3, no. 2, April 2019 (see)
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K. Akbari Hamed, W. Ma, and A. D. Ames, “Dynamically stable 3D quadruped walking with multi-domain hybrid system models and virtual constraint controllers,” American Control Conference (ACC), pp. 4588-4595, July 2019 (see) (supplementary document) (animation)
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W-L. Ma, K. Akbari Hamed, and A. D. Ames, “First steps towards full model-based motion planning and control of quadrupeds: A hybrid zero dynamics approach,” IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 5498-5503, November 2019 (see) (video)
2018
Journal and Conference Papers and Dissertations
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K. Akbari Hamed and R. D. Gregg, "Decentralized event-based controllers for robust stabilization of hybrid periodic orbits: Application to underactuated 3D bipedal walking," IEEE Transactions on Automatic Control, vol. 64, no. 6, pp. 2266-2281, June 2019 (see), (animation)
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K. Akbari Hamed, A. D. Ames, and R. D. Gregg, "Observer-based feedback controllers for exponential stabilization of hybrid periodic orbits: Application to underactuated bipedal walking," American Control Conference (ACC), pp. 1438-1445, Milwaukee, WI, June 2018 (see), (animation)
2017
Journal and Conference Papers and Dissertations
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K. Akbari Hamed and R. D. Gregg, "Decentralized feedback controllers for robust stabilization of periodic orbits of hybrid systems: Application to bipedal walking," IEEE Transactions on Control Systems Technology, vol. 25, issue 4, pp. 1153-1167, July 2017 (see), (animation)
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K. Akbari Hamed and J. W. Grizzle, "Reduced-order framework for exponential stabilization of periodic orbits on parameterized hybrid zero dynamics manifolds: Application to bipedal locomotion," Nonlinear Analysis: Hybrid Systems, vol. 25, pp. 227-245, August 2017 (see), (animation)
2016
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, B. G. Buss, and J. W. Grizzle, "Exponentially stabilizing continuous-time controllers for periodic orbits of hybrid systems: Application to bipedal locomotion with ground height variations," The International Journal of Robotics Research, vol. 35, no. 8, pp. 977-999, August 2016 (see), (animation), (video)
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K. Akbari Hamed, A. D. Ames, and R. D. Gregg, "Decentralized feedback controllers for exponential stabilization of hybrid periodic orbits: Application to robotic walking," American Control Conference (ACC), pp. 4793-4800, Boston, MA, July 2016 (see), (animation)
2015
Journal and Conference Papers and Dissertations
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K. Akbari Hamed and J. W. Grizzle, "Iterative robust stabilization algorithm for periodic orbits of hybrid dynamical systems: Application to bipedal running," IFAC Conference on Analysis and Design of Hybrid Systems (ADHS), vol. 48, no. 27, pp. 161-168, Atlanta GA, October 2015 (see)
2014
Journal and Conference Papers and Dissertations
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K. Akbari Hamed and J. W. Grizzle, "Event-based stabilization of periodic orbits for underactuated 3D bipedal robots with left-right symmetry," IEEE Transactions on Robotics, vol. 30, issue 2, pp. 365-381, April 2014 (see), (animation)
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K. Akbari Hamed, B. G. Buss, and J. W. Grizzle, "Continuous-time controllers for stabilizing periodic orbits of hybrid systems: Application to an underactuated 3D bipedal robot," IEEE Conference on Decision and Control (CDC), pp. 1507 - 1513, Los Angeles, CA, December 2014 (see), (animation)
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B. G. Buss, A. Ramezani, K. Akbari Hamed, B. A. Griffin, K. S. Galloway, and J. W. Grizzle, "Preliminary walking experiments with underactuated 3D bipedal robot MARLO," IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 2529-2536, Chicago, IL, September 2014 (see), (video)
2013
Journal and Conference Papers and Dissertations
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A. Ramezani, J. W. Hurst, K. Akbari Hamed, and J. W. Grizzle, "Performance analysis and feedback control of ATRIAS, a 3D bipedal robot," ASME Journal of Dynamic Systems, Measurement and Control, 136(2), 021012, December 2013 (see)
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K. Akbari Hamed and J. W. Grizzle, "Robust event-based stabilization of periodic orbits for hybrid systems: Application to an underactuated 3D bipedal robot," American Control Conference (ACC), Washington, DC, USA, pp. 6206-6212, June 2013 (see)
2012
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, N. Sadati, W. A. Gruver, and G. A. Dumont, "Stabilization of periodic orbits for planar walking with non-instantaneous double support phase," IEEE Transactions on Systems, Man, and Cybernetics, Part A, vol. 42, issue 3, pp. 685-706, May 2012 (see)
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N. Sadati, G. A. Dumont, K. Akbari Hamed, and W. A. Gruver, Hybrid Control and Motion Planning of Dynamical Legged Locomotion, Series on Systems Science and Engineering, Wiley-IEEE Press, ISBN: 978-1-118-31707-5, 272 pages, Hoboken, NJ, USA, October 2012 (see)
2011
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, Design of Continuous Time-Invariant Controllers for Exponential Stabilization of Periodic Walking and Running Locomotion in Planar Bipedal Robots, Ph.D. dissertation, Sharif University of Technology, June 2011 (see)
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K. Akbari Hamed, N. Sadati, W. A. Gruver, and G. A. Dumont, “Exponential stabilization of periodic orbits for running of a three-dimensional monopedal robot,” IET Control Theory and Applications, vol. 5, issue 11, pp. 1304-1320, July 2011 (see)
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N. Sadati, G. A. Dumont, K. Akbari Hamed, and W. A. Gruver, “Two-level control scheme for stabilization of periodic orbits for planar monopedal running,” IET Control Theory and Applications, vol. 5, issue 13, pp. 1528-1543, August 2011 (see)
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R. Ansari, M. R. Feyzi, K. Akbari Hamed, N. Sadati, Y. Yasaei and S. Ouni, “Input-output linearization of a fourth-order input-affine system describing the evolution of a three-phase/switch/level (Vienna) rectifier,” IET Power Electronics, vol.4, issue 8, pp. 867-883, September 2011 (see)
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N. Sadati, K. Akbari Hamed, W. A. Gruver, and G. A. Dumont, “Radial basis function network for exponential stabilization of periodic orbits for planar bipedal walking,” IET Electronics Letters, vol. 47, issue 12, June 2011 (see)
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N. Sadati, K. Akbari Hamed, G. A. Dumont, and W. A. Gruver, “Nonholonomic motion planning based on optimal control for flight phases of planar bipedal running,” IET Electronics Letters, vol. 47, issue 20, September 2011 (see)
2010
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, N. Sadati, W. A. Gruver, and G. A. Dumont, “Continuous-time update laws with radial basis step length for control of bipedal locomotion,” IET Electronics Letters, vol. 46, issue 21, October 2010 (see)
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N. Sadati, G. A. Dumont, and K. Akbari Hamed, Design of a Neural Controller for Walking of a 5-Link Planar Biped Robot via Optimization, Human-Robot Interaction, Daisuke Chugo (Ed.), ISBN: 978-953-307-051-3, InTech, pp. 267-288, February 2010
2007
Journal and Conference Papers and Dissertations
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N. Sadati and K. Akbari Hamed, “CPG based controller for a 5-link planar biped robot,” IEEE International Conference on Mechatronics, Kumamoto, Japan, pp. 1-6, May 2007
2006
Journal and Conference Papers and Dissertations
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K. Akbari Hamed, Simulation and Intelligent Control of Central Pattern Generators in Spinal Cord for Bipedal Robots, M.S. dissertation, Sharif University of Technology, September 2006
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N. Sadati and K. Akbari Hamed, “Neural control of a fully actuated biped robot,” IEEE International Conference on Robotics and Biomimetics, Kunming, China, pp. 1299-1304, December 2006
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N. Sadati and K. Akbari Hamed, “Neural control of an underactuated biped robot,” IEEE-RAS International Conference on Humanoid Robot, Genova, Italy, pp. 593-598, December 2006