Accurate and Robust Unloading Force Rendering via a Series Elastic Actuator-driven Body Weight Support System

Strategic Insights -

Researchers from the National University of Singapore have developed a compliant body weight support system powered by a series elastic actuator, enabling accurate and robust unloading force rendering for gait training. This innovative system addresses the limitations of previous methods, including post-SEA disturbances and intrinsic oscillatory modes. The proposed control framework eliminates the influence of post-SEA dynamics, accurately estimating the unloading force and achieving direct control of interaction force. The research, published in IEEE Robotics and Automation Letters, demonstrates the effectiveness of the system in rendering interaction forces robust to human disturbances up to 5 Hz.

Key Takeaways:

  • A compliant body weight support system powered by a series elastic actuator has been developed by researchers from the National University of Singapore.
  • The system addresses the limitations of previous methods, including post-SEA disturbances and intrinsic oscillatory modes.
  • The proposed control framework accurately estimates the unloading force and achieves direct control of interaction force.
  • Interaction experiments demonstrate that the proposed control framework is robust to human disturbances up to 5 Hz.
  • The control error of the proposed framework is reduced by up to 60% compared to the velocity-sourced SEA controller.
  • The system has high deployability and ease of tuning, fully harnessing the potential of SEAs in safe and accurate force rendering.
  • The research has been peer-reviewed and published in IEEE Robotics and Automation Letters.

Statistics:

  • Up to 60% reduction in control error compared to the velocity-sourced SEA controller.
  • Robustness to human disturbances up to 5 Hz.
  • 5058-5065: the volume and page numbers of the research publication in IEEE Robotics and Automation Letters.
  • 2025: the year of publication for the research in IEEE Robotics and Automation Letters.

Sources:

  • Toward Accurate and Robust Unloading Force Rendering Via a Series Elastic Actuator-driven Body Weight Support System. IEEE Robotics and Automation Letters, 2025;10(5):5058-5065.
  • National University of Singapore, Dept. of Biomedical Engineering, Singapore 117583, Singapore (research contact).
  • Ieee-inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA (publisher of IEEE Robotics and Automation Letters).
  • NewsRx LLC (copyright holder of the news report).