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Compliant, Large-Strain, and Self-Sensing Twisted String Actuators.

David Bombara1, Steven Fowzer1, Jun Zhang1

  • 1Department of Mechanical Engineering, University of Nevada, Reno, Nevada, USA.

Soft Robotics
|November 20, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed compliant twisted string actuators (TSAs) for soft robotics. These self-sensing actuators offer large strain and efficient actuation, enabling a novel compliant robotic gripper.

Keywords:
self-sensingsupercoiled polymerstwisted string actuators

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Area of Science:

  • Robotics
  • Materials Science
  • Actuation Systems

Background:

  • Twisted string actuators (TSAs) offer high efficiency and large strain but are typically stiff and require external sensors, limiting their use in soft robotics.
  • Conventional TSAs result in rigid, bulky robots due to non-compliant strings and reliance on external sensing for precise control.
  • The need for compliant, self-sensing actuators is critical for advancing soft robotic applications.

Purpose of the Study:

  • To design, model, and demonstrate novel compliant twisted string actuators (TSAs) with self-sensing capabilities for soft robotics.
  • To overcome the limitations of conventional TSAs by incorporating compliant materials and integrated sensing.
  • To enable the development of more flexible, compact, and precisely controlled soft robotic systems.

Main Methods:

  • Replaced conventional stiff strings in TSAs with compliant, thermally activated, conductive supercoiled polymer strings.
  • Developed a model using Preisach hysteresis operators to accurately capture quasi-static actuation and self-sensing properties.
  • Investigated both twisting-induced and thermally induced actuation mechanisms.

Main Results:

  • The developed TSAs exhibit normalized stiffness below 50 N and strain exceeding 30%.
  • Demonstrated reliable position self-sensing capability during twisting actuation.
  • Successfully modeled and characterized both actuation types using Preisach hysteresis operators.

Conclusions:

  • The novel compliant, self-sensing TSAs are suitable for soft robotics applications.
  • The developed actuators offer a pathway to creating more integrated and capable soft robotic systems.
  • Demonstrated a low-cost, 3D-printed compliant robotic gripper driven by the new TSAs.