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A Handheld Stiffness Display with a Programmable Spring and Electrostatic Clutches for Haptic Interaction in Virtual

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    This study introduces a new handheld haptic device using a dual actuation design with a programmable spring and electrostatic clutches for wide-range stiffness feedback. The innovative system offers realistic elastic feedback with low power consumption.

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    Area of Science:

    • Robotics
    • Human-Computer Interaction
    • Mechanical Engineering

    Background:

    • Handheld haptic devices struggle to provide high force output and backdrivability simultaneously.
    • Conventional actuation mechanisms limit stiffness feedback capabilities under practical constraints like power, size, and weight.

    Purpose of the Study:

    • To develop a lightweight, low-power handheld haptic device with a wide range of stiffness feedback.
    • To overcome the limitations of existing actuation mechanisms in handheld haptic devices.

    Main Methods:

    • A novel dual actuation design combining a programmable spring (PS) and two electrostatic clutches (ECs).
    • The PS provides tunable physical stiffness via an adjustable lever arm.
    • ECs compensate for PS limitations, enabling a wider display range and free motion.

    Main Results:

    • A fully integrated prototype with wireless communication, control, and power modules was successfully developed.
    • The device demonstrated effective stiffness rendering from free motion to full rigidity.
    • User studies confirmed more realistic elastic feedback compared to conventional electric motor systems.

    Conclusions:

    • The proposed dual actuation design effectively addresses the challenges of stiffness feedback in handheld haptic devices.
    • The device offers a practical solution for realistic and wide-range stiffness rendering with low power consumption.
    • This technology has the potential to enhance immersive experiences in virtual reality and teleoperation.