Real-time UVMS torque distribution algorithm based on weighting matrix.

Area of Science:

• Robotics
• Ocean Engineering
• Control Systems

Background:

• Underwater vehicle manipulator systems (UVMS) require efficient torque management for complex tasks.
• Redundant robotic systems, like those on AUVs, present challenges in dynamic load distribution.
• Accurate kinematic and dynamic modeling is crucial for effective control in underwater environments.

Purpose of the Study:

• To develop and validate a real-time algorithm for equitable torque distribution between an AUV and its manipulator.
• To optimize underwater robotic operations by minimizing manipulator torque burden.
• To enhance the efficiency and precision of tasks performed by UVMS.

Main Methods:

• Utilized a weighted pseudo-inverse approach with a weighting matrix for kinematic and dynamic modeling of the UVMS.
• Implemented dynamic and kinematic modeling based on the force distribution characteristics of parallel manipulators.
• Employed the Taguchi method to minimize calculation time for real-time processing and optimize torque for valve rotation tasks.
• Dynamically adjusted the weighting matrix every second to facilitate AUV-manipulator torque sharing.

Main Results:

• Experimental validation in an underwater environment demonstrated the algorithm's effectiveness.
• Significant reduction in manipulator torque load was achieved through cooperative load distribution with the AUV.
• The Taguchi method contributed to efficient real-time calculations, enabling precise valve rotation with minimal torque.

Conclusions:

• The proposed real-time algorithm successfully achieves even torque distribution in UVMS.
• Cooperative load sharing between the AUV and manipulator enhances operational efficiency and reduces stress on the manipulator.
• This approach offers a viable solution for precise and low-torque manipulation in challenging underwater conditions.