Single-Input Control of Multiple Fluid-Driven Elastic Actuators via Interaction Between Bistability and Viscosity.

Area of Science:

• Soft Robotics
• Microfluidics
• Elastic Actuators

Background:

• Pressurized flow in elastic bodies is key for soft robotics actuation and microfluidic devices.
• Complex deformations often require multi-input control, complicating system operation.
• Bistable elastic chambers offer potential for advanced actuator designs.

Purpose of the Study:

• To develop a novel single-input control method for serial chains of bistable elastic chambers.
• To demonstrate the ability to reach any desired state combination using a single flow rate.
• To simplify control in soft robotic and microfluidic systems.

Main Methods:

• Mathematical formulation and dynamic analysis of bistable elastic chamber chains.
• Utilizing bistability and pressure lag induced by viscous resistance for state transitions.
• Experimental validation using water-diluted glycerol in chains up to five chambers.

Main Results:

• Achieved irreversible state transitions in bistable elastic chambers via single-input flow control.
• Demonstrated that any desired state combination can be reached.
• Numerical simulations and experiments confirmed the efficacy of the control method.

Conclusions:

• The proposed single-input control method offers a simplified approach to operating complex soft actuators.
• This technique has significant potential for developing sophisticated soft robotic systems with minimalistic control.
• Bistability combined with pressure lag is crucial for enabling controlled state transitions.