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Related Experiment Video

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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Pneumatic Variable Series Elastic Actuator.

Hao Zheng1, Molei Wu1, Xiangrong Shen1

  • 1Department of Mechanical Engineering, The University of Alabama, 359 H. M. Comer Hall, Box 870276, Tuscaloosa, AL 35487-0276.

Journal of Dynamic Systems, Measurement, and Control
|June 30, 2016
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Summary
This summary is machine-generated.

This study introduces a novel pneumatic actuator for variable stiffness control in robotics. This approach offers a simpler, more efficient, and cost-effective solution for human-interactive robotic tasks.

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Area of Science:

  • Robotics
  • Control Systems
  • Mechanical Engineering

Background:

  • Stiffness control is crucial for robotic manipulation and human interaction.
  • Existing methods often rely on complex closed-loop systems with limitations in frequency, stability, and energy efficiency.
  • Current variable-stiffness actuators are typically heavy and bulky.

Purpose of the Study:

  • To develop a novel variable series elastic actuator (VSEA) using a pneumatic actuator.
  • To address the limitations of existing stiffness control implementations in robotics.
  • To enable efficient and cost-effective stiffness control in robotic systems.

Main Methods:

  • Modeling a pneumatic actuator as an elastic element with controllable stiffness and equilibrium point based on air mass.
  • Converting desired stiffness/equilibrium points to target chamber air masses.
  • Implementing a predictive pressure control approach for precise valve switching and minimized control action.

Main Results:

  • Demonstrated a system using less expensive hardware (on-off valves).
  • Achieved reduced control action during implementation.
  • Showcased good control performance by utilizing the actuator's inherent dynamics.

Conclusions:

  • The proposed pneumatic VSEA offers a viable alternative for stiffness control in robotics.
  • This approach simplifies hardware requirements and control complexity.
  • It provides effective stiffness control for manipulation and human-interactive tasks.