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    Area of Science:

    • Robotics
    • Control Systems
    • Human-Computer Interaction

    Background:

    • The Time Domain Passivity Approach (TDPA) is a standard for stabilizing controllers in haptics and teleoperation.
    • TDPA's reliance on passivity introduces conservatism, limiting performance.
    • High-frequency control actions degrade transparency in haptic systems.

    Purpose of the Study:

    • To propose a novel method for relaxing conservatism in haptic interactions.
    • To enhance the stable impedance range while maintaining high transparency.
    • To develop adaptive damping strategies based on energy exchange.

    Main Methods:

    • Introduction of an 'energy cycle' concept based on pressing and releasing paths in haptic interaction.
    • Estimation of energy generation by comparing energies at the end of each energy cycle.
    • Injection of adaptive damping to regulate energy generation over subsequent cycles.
    • Implementation of low-frequency control actions.

    Main Results:

    • The proposed method successfully relaxes conservatism in haptic interactions.
    • Enhanced stable impedance range and improved transparency compared to TDPA.
    • Demonstrated validity through simulations and experiments.

    Conclusions:

    • The energy cycle approach offers a less conservative alternative to TDPA for controller design.
    • Adaptive damping based on energy regulation effectively improves haptic system performance.
    • The method achieves high transparency and expands the stable impedance range in haptic devices.