Bioinspired Design for Energy-Efficient Soft Actuators Achieving Asymmetrical Spatiotemporal Deformation

Area of Science:

• Robotics
• Bioinspired Engineering
• Materials Science

Background:

• Conventional soft actuators often require complex structures and multiple air channels for sophisticated movements.
• Achieving asymmetrical spatiotemporal deformations, mimicking biological locomotion, remains a challenge in soft robotics.
• Energy efficiency and structural simplicity are key limitations in current soft actuator designs.

Purpose of the Study:

• To present a novel bioinspired pneumatic soft actuator capable of asymmetrical spatiotemporal deformations.
• To demonstrate a simplified design using a half-crossing structure with only two air tubes.
• To achieve energy-efficient and versatile adaptive locomotion in soft robotic systems.

Main Methods:

• Design and fabrication of a pneumatic soft actuator featuring a unique half-crossing structure.
• Utilizing controlled airflow through two air tubes to generate complex bending and linear motions.
• Implementing a passive feedforward control strategy for enhanced movement flexibility.
• Integration and testing of the actuator in a hexapod robot platform.

Main Results:

• The novel actuator successfully produced asymmetrical spatiotemporal deformations, mimicking human walking phases (stance and swing).
• Complex multidirectional movements, including forward, backward, and turning, were achieved with reduced structural complexity and energy consumption.
• Experimental validation on a hexapod robot demonstrated the actuator's adaptability and efficiency.
• Optimized performance was achieved by adjusting air pressure and cycle duration.

Conclusions:

• The bioinspired pneumatic soft actuator offers a versatile and energy-efficient solution for adaptive locomotion.
• The simplified half-crossing structure significantly reduces complexity and energy demands compared to conventional designs.
• This novel approach advances the field of soft robotics by enabling more biomimetic and efficient movement.