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Decentralized Passivity-Based Control With a Generalized Energy Storage Function for Robust Biped Locomotion.

Mark Yeatman1, Ge Lv2, Robert D Gregg3

  • 1Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080.

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Summary
This summary is machine-generated.

This study introduces a decentralized passivity-based control (PBC) for robust biped locomotion. The new method enhances stability and adaptability in biped robots and wearable devices, even with model uncertainties.

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Area of Science:

  • Robotics
  • Control Systems
  • Biomechanics

Background:

  • Biped locomotion is susceptible to external torques and model inaccuracies.
  • Previous passivity-based control (PBC) enhanced biped stability using generalized energy feedback.
  • Limitations included sensitivity to model uncertainty and hardware constraints.

Purpose of the Study:

  • To develop a decentralized PBC for robust biped locomotion.
  • To address model uncertainty and limited sensing capabilities.
  • To enable application in wearable devices like exoskeletons and prosthetics.

Main Methods:

  • A theoretical framework was developed to allow neglecting arbitrary states and parameters.
  • Decentralized control was implemented, reducing reliance on full system knowledge.
  • Simulations were performed on a six-link biped model.

Main Results:

  • The proposed control scheme significantly increased the convergence rate to a stable walking gait.
  • Enhanced robustness against external perturbations and variations in ground slope was demonstrated.
  • The control strategy proved effective without requiring a user dynamics model.

Conclusions:

  • Decentralized PBC offers a robust solution for biped locomotion control.
  • The framework successfully handles model uncertainties and hardware limitations.
  • This approach is suitable for real-world applications in assistive robotic devices.