A wrist-inspired suspended tubercle-type tensegrity joint with variable stiffness capacity.

Area of Science:

• Robotics
• Bionics
• Mechanical Engineering

Background:

• Traditional rigid robots pose safety risks in human-robot interaction and unpredictable environments.
• Bionic features like flexibility, compliance, and variable stiffness are crucial for advanced robotic joints.

Purpose of the Study:

• To research tensegrity structures with suspended tubercles for bionic robotic joints.
• To develop a wrist-inspired joint with variable stiffness and multiple degrees of freedom.
• To investigate the range of motion, stiffness adjustability, and their interplay.

Main Methods:

• Theoretical derivation and simulation using the NASA Tensegrity Robot Toolkit (NTRT).
• Design and construction of a prototype wrist-inspired tensegrity joint.
• Experimental testing of the prototype using a motion capture system.

Main Results:

• The suspended tubercle design effectively provides joint compliance and flexibility.
• Variable stiffness is achieved by modulating internal tensegrity stress via driving tendons.
• Experimental results closely match theoretical simulations, validating the design.

Conclusions:

• The suspended tubercle tensegrity joint demonstrates flexibility, adjustable stiffness, and ease of control.
• This technology holds significant potential for developing advanced bionic robotic joints.
• Soft, compliant robotic designs are superior for human-robot interaction and complex environments.