A Pneumatic Flexible Linear Actuator Inspired by Snake Swallowing.

Area of Science:

• Robotics
• Biomimetics
• Materials Science

Background:

• Developing high-performance soft actuators for human-machine interaction faces challenges with force, distance, precision, safety, and compliance.
• Existing soft actuators often involve trade-offs, limiting their application in demanding scenarios.

Purpose of the Study:

• To introduce an innovative pneumatic flexible linear actuator (PFLA) that overcomes limitations in long-distance and high-precision soft actuation.
• To emulate the biomimetic principles of snake locomotion for enhanced actuator performance.

Main Methods:

• Designed a PFLA combining a soft tube (snake body cavity emulation) with a pneumatically driven piston.
• Utilized joint modulation of pneumatic pressure to control moving resistance and driving force.
• Integrated self-holding, self-protection, and variable speed capabilities.

Main Results:

• The PFLA demonstrated exceptional motion control, including self-holding without continuous pressure.
• Achieved smooth low-speed motion (0.004 m s^-1) and high-speed motion (5.6 m s^-1) with low air pressure.
• Showcased adaptability in applications like wearable devices, precise manipulators, and pipeline inspection robots.

Conclusions:

• The PFLA offers a breakthrough in flexible linear actuation, combining biomimicry with advanced fluidic control.
• Provides a versatile, safe, and precise solution for force/motion transmission in challenging environments.
• Paves the way for next-generation soft robots and human-machine interfaces.