Modular Continuum Manipulator: Analysis and Characterization of Its Basic Module.

Area of Science:

• Robotics and Mechanical Engineering
• Soft Robotics
• Mechatronics

Background:

• Existing robotic arms often lack the dexterity and robustness required for complex, real-world tasks.
• The development of compliant manipulators is crucial for safe and versatile human-robot interaction and task execution.
• Modular robotic systems offer scalability and adaptability for diverse applications.

Purpose of the Study:

• To introduce and characterize the basic module of the Soft Compliant Manipulator for Broad Applications (SIMBA) robotic arm.
• To demonstrate the design, fabrication, and performance of a hybrid rigid-soft robotic module.
• To validate the potential of this module as a building block for complex robotic structures.

Main Methods:

• Extensive analysis and characterization of the SIMBA arm's basic module.
• Development and validation of theoretical models for kinematic, stiffness, and bending behavior.
• Empirical testing to verify model predictions and assess performance metrics.

Main Results:

• The SIMBA module exhibits a three-dimensional workspace with constant radius, large bending, and complete rotation.
• Achieved high repeatability with a positional error of less than ≈6% of the module diameter.
• Demonstrated passive stiffness of 0.8 N/mm, capable of supporting approximately 1 kg loads.

Conclusions:

• The SIMBA basic module is a versatile, dexterous, and robust robotic element.
• Its passive stiffness and high repeatability make it suitable for applications requiring directional stiffness without active mechanisms.
• The modular design enables its use in complex structures for tasks like object manipulation and environmental interaction.