Tele-Manipulation with Two Asymmetric Slaves: Two Operators Perform Better Than One

Area of Science:

• Human-robot interaction
• Robotics
• Control systems

Background:

• Tele-manipulation often involves asymmetric robotic slaves, such as cranes and dexterous arms.
• Optimal human-in-the-loop control strategies for such systems are not well-established.

Purpose of the Study:

• To quantitatively compare operator performance under three control conditions: two co-operating operators, single bi-manual control, and single uni-manual control.
• To evaluate task performance and control activity in a heavy load maneuvering and mounting task.

Main Methods:

• A human factors experiment was conducted using a vertical crane and a robotic arm.
• Participants performed a task under three distinct control configurations.
• Performance metrics included task completion time and control activity.

Main Results:

• Two co-operating operators achieved significantly faster task completion times compared to single bi-manual or uni-manual operators.
• Uni-manual control showed increased activity on the crane but decreased activity on the robotic arm relative to co-operators.
• Bi-manual control exhibited worse performance and higher control activity than co-operation.

Conclusions:

• Co-operation between two operators is superior to single-operator control (bi-manual or uni-manual) for tele-manipulating two asymmetric robotic slaves.
• The findings suggest that distributed control enhances performance in complex, asymmetric tele-manipulation tasks.