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Programmable soft valves for digital and analog control.

Colter J Decker1,2, Haihui Joy Jiang1, Markus P Nemitz3

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed novel soft pneumatic valves capable of both digital and analog control, overcoming limitations of existing soft robotic systems. These versatile valves enable complex functions like memory storage and user interfacing for advanced soft robots.

Keywords:
analog controldigital logicnonlinear mechanicsprogrammable devicesuntethered soft robotics

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Area of Science:

  • Robotics
  • Materials Science
  • Fluidics

Background:

  • Soft pneumatic control systems often lack combined digital and analog capabilities.
  • Existing soft systems face limitations in speed, pressure range, fabrication time, and power efficiency.

Purpose of the Study:

  • To develop modular soft pneumatic components for versatile control in soft devices.
  • To create soft valves capable of both digital and analog operations, enabling complex functionalities.

Main Methods:

  • Leveraged nonlinear mechanics of soft materials, specifically membrane inversion and tube kinking.
  • Developed two modular components: a piston actuator and a bistable pneumatic switch.
  • Integrated these components to form unified soft valves.

Main Results:

  • Achieved soft valves with analog pressure regulation, simplified digital logic, and controlled oscillation.
  • Demonstrated nonvolatile memory storage and linear actuation capabilities.
  • Enabled seamless digital and analog interfacing for human-robot interaction.

Conclusions:

  • The developed soft valves offer a unified design for complementary digital and analog control in soft robots.
  • Showcased system capabilities through demonstrations including a wearable glove, a medical cushion matrix, and an untethered robot.
  • Paved the way for more sophisticated and adaptable soft robotic systems.