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Haptic/Graphic Rehabilitation: Integrating a Robot into a Virtual Environment Library and Applying it to Stroke Therapy
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Haptic Virtual Fixtures for Telemanipulation Using Control Barrier Functions.

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    Control barrier functions (CBF) enhance mobile manipulator teleoperation safety and performance by creating virtual fixtures. This research ensures robots avoid constraints while maintaining user tracking, improving physical human-robot interaction (pHRI).

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    Area of Science:

    • Robotics
    • Control Theory
    • Human-Robot Interaction

    Background:

    • Teleoperating mobile manipulators presents challenges in depth perception and situational awareness, increasing cognitive load.
    • Virtual fixtures can improve teleoperation but require safety guarantees for physical human-robot interaction (pHRI).

    Purpose of the Study:

    • To propose a virtual fixture architecture using control barrier functions (CBF) to balance performance and safety in teleoperation.
    • To ensure user-robot tracking performance outside fixture violations and prevent constraint overshooting.

    Main Methods:

    • Designed a virtual fixture architecture utilizing control barrier functions (CBF).
    • Analyzed the relationship between tracking performance and safety parameters.
    • Implemented the CBF-based virtual fixture architecture on a mobile manipulator platform.

    Main Results:

    • The ratio of tracking control gain to safety decay rate determines CBF filter and force feedback activation.
    • The proposed architecture maintains tracking performance while ensuring safety constraints are not violated.
    • User performance in a simulated temperature scanning task was investigated using the implemented system.

    Conclusions:

    • Control barrier functions (CBF) offer a viable method for designing safe and effective haptic virtual fixtures.
    • CBF-based virtual fixtures show potential for enhancing physical human-robot interaction (pHRI) tasks.
    • The developed architecture allows for tunable trade-offs between teleoperation performance and safety.