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Updated: Feb 16, 2026

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Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses
Published on: January 7, 2019
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Stable, Robust Hybrid Zero Dynamics Control of Powered Lower-Limb Prostheses
Anne E Martin1, Robert D Gregg2
1A. E. Martin is with the Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA, 16802 USA.
Summary
Researchers adapted advanced robot control for powered prostheses, enhancing stability and robustness for lower-limb amputees. This improves the quality of life for individuals using artificial limbs.
Area of Science:
- Robotics
- Biomechanics
- Prosthetics
Background:
- Powered prostheses aim to improve quality of life for lower-limb amputees.
- Hybrid zero dynamics (HZD) is an advanced control scheme from bipedal robotics with potential for prosthetic applications.
Purpose of the Study:
- To adapt HZD-based control for powered prostheses, addressing challenges like decentralized state information and gait variability.
- To extend stability metrics for two-step periodic gaits and ensure robustness to perturbations.
Main Methods:
- Decentralized input-output linearization for prosthesis control without full bipedal state access.
- Extension of orbital stability metrics for two-step periodic gaits.
- Application of local input-to-state stability to prove robustness against perturbations.
Main Results:
- Demonstrated a modified HZD control approach suitable for powered prostheses.
- Extended stability analysis to accommodate the two-step gait of amputees.
- Validated robustness of the control scheme through simulations on an above-knee amputee model.
Conclusions:
- The adapted HZD control offers a promising method for developing advanced powered prostheses.
- The control strategy enhances stability and robustness, crucial for real-world amputee gait.
- This research contributes to improving the functionality and performance of artificial limbs.
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