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Related Experiment Video

Updated: Sep 16, 2025

A Standardized Method for Measurement of Elbow Kinesthesia
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System Performance Analysis of the Shoulder Elbow Perturbator.

Jonathan C van Zanten, Karien Ter Welle, Claudia J W Haarman

    IEEE ... International Conference on Rehabilitation Robotics : [Proceedings]
    |July 11, 2025
    PubMed
    Summary

    The Shoulder Elbow Perturbator (SEP) robot accurately identifies causes of motor impairment in stroke patients. Its high bandwidth and stable controller performance meet system identification requirements for the human elbow.

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    Area of Science:

    • Rehabilitation Engineering
    • Biomechanics
    • Robotics

    Background:

    • Stroke survivors often experience motor impairments, necessitating advanced diagnostic tools.
    • Current diagnostic methods may lack the precision needed to identify specific causes of motor impairment.
    • Robotic diagnostics offer enhanced measurement resolution and progress tracking for stroke rehabilitation.

    Purpose of the Study:

    • To analyze the system performance of the Shoulder Elbow Perturbator (SEP).
    • To determine if the SEP meets the required specifications for accurate human elbow system identification.
    • To validate the SEP's suitability for diagnosing post-stroke motor impairments.

    Main Methods:

    • System identification of the SEP using multisine perturbation signals.
    • Analysis of controller bandwidths (velocity and admittance) and endpoint dynamics.
    • Evaluation of controller stability under experimental conditions.

    Main Results:

    • The SEP demonstrated adequate performance for desired perturbations and experimental conditions.
    • The velocity controller bandwidth was measured at 50 Hz, and the admittance controller bandwidth at 65 Hz.
    • The SEP's controller was found to be stable, exceeding the minimum 12 Hz bandwidth requirement for elbow joint identification.

    Conclusions:

    • The Shoulder Elbow Perturbator (SEP) meets all performance requirements for system identification of the human elbow.
    • The SEP is suitable for providing precise perturbations necessary for diagnosing post-stroke motor impairments.
    • This validated performance supports the SEP's role in improving stroke patient quality of life through better diagnostics.