Programmable soft valves for digital and analog control

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.