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Tubular Jamming: A Variable Stiffening Method Toward High-Force Applications with Soft Robotic Components.

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Tubular jamming provides a lightweight, motion-adaptable stiffening method for soft robotic actuators. This innovation enhances load-bearing capacity and torque output, enabling high-force applications while maintaining safety.

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Area of Science:

  • Robotics
  • Materials Science
  • Mechanical Engineering

Background:

  • Soft robotic actuators offer flexibility for safe human-robot interaction and delicate object manipulation.
  • Their inherent flexibility limits performance in high-force applications, leading to component failure.
  • Existing stiffening solutions often introduce bulk, weight, or motion restrictions.

Purpose of the Study:

  • To introduce and demonstrate Tubular Jamming as a novel stiffening method for soft robotic actuators.
  • To evaluate the effectiveness of Tubular Jamming in enhancing stiffness, load-bearing, and actuation capabilities.
  • To explore the adaptability of Tubular Jamming in motion-coupled soft structures.

Main Methods:

  • Development and fabrication of two exemplary soft structures: a tubular jammed beam (TJB) and a tubular jammed hinge (TJH).
  • Characterization of the mechanical properties, including bending stiffness and torque output, of the TJB and TJH.
  • Demonstration of TJB and TJH in representative applications, such as weight-bearing supports and wearablectuation devices.

Main Results:

  • Tubular jamming increased the bending stiffness of a soft pneumatic actuator beam by nearly threefold.
  • The TJB required lower supply pressure for equivalent performance and improved object stability compared to traditional soft pneumatic actuators.
  • A TJB structure supported a load over 33 times its own weight.
  • Three tubular jammed hinges generated approximately four times the torque of a single hinge.
  • The TJH was successfully integrated into a wearable elbow flexion device.

Conclusions:

  • Tubular Jamming offers an effective, lightweight, and motion-adaptable solution for stiffening soft robotic components.
  • This method significantly enhances stiffness and actuation force, expanding the applicability of soft robotics to high-force tasks.
  • Tubular jamming enables soft robots to perform demanding tasks like weight bearing and large-scale actuation while preserving safe interaction capabilities.