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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Continuously-variable series-elastic actuator.

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    Summary
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    A new continuously-variable series-elastic actuator (CV-SEA) improves energy efficiency for legged locomotion. Simulations show the CV-SEA requires less energy than other actuators for knee prostheses during walking.

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    Area of Science:

    • Robotics
    • Biomechanics
    • Mechanical Engineering

    Background:

    • Actuator efficiency is critical for powered prostheses, orthoses, exoskeletons, and legged robots.
    • Series-elastic actuators (SEAs) offer energy storage and release benefits for locomotion.
    • Optimizing actuator design is key to enhancing performance and reducing energy consumption.

    Purpose of the Study:

    • To introduce and evaluate a novel continuously-variable series-elastic actuator (CV-SEA) for legged locomotion.
    • To investigate the energy efficiency of the CV-SEA compared to standard and infinitely variable series-elastic actuators.
    • To develop an energy-efficient control strategy for the CV-SEA using Monte-Carlo minimization.

    Main Methods:

    • The CV-SEA integrates a continuously-variable transmission (CVT) between a motor and a series elastic element.
    • A Monte-Carlo minimization method was employed to develop an energy-efficient control strategy.
    • Simulations compared the CV-SEA against a standard SEA and an infinitely variable series elastic actuator (IV-SEA).

    Main Results:

    • The CVT in the CV-SEA reduces motor torque and enables operation at higher motor efficiency speeds.
    • The series-elastic element efficiently manages mechanical energy, decreasing motor work.
    • Simulations indicated the CV-SEA consumes less energy than SEA or IV-SEA for knee prosthesis level-ground walking.

    Conclusions:

    • The CV-SEA presents a promising solution for energy-efficient legged locomotion.
    • The developed control strategy effectively minimizes electrical energy consumption.
    • The CV-SEA design offers significant advantages for powered leg prostheses and robotic applications.