Performance characterization of a novel semi-active exoskeleton for overhead work.

Area of Science:

• Ergonomics and Human Factors
• Robotics and Biomechanics

Background:

• Passive exoskeletons have limitations in adaptability and support.
• Active and semi-active systems are often heavy or underdeveloped.
• Overhead work poses significant ergonomic challenges for workers.

Purpose of the Study:

• To develop a lightweight, semi-active shoulder exoskeleton.
• To incorporate a novel motorized torque adjustment mechanism.
• To enhance worker support during strenuous overhead tasks.

Main Methods:

• Designed a semi-active exoskeleton with a motorized lever arm adjustment mechanism.
• Integrated motors on the user's back actuated via Bowden cables.
• Experimentally characterized dynamic support torque, adjustment times, and energy consumption.

Main Results:

• Achieved plateau-like support torque profiles up to 12 Nm per arm.
• Demonstrated rapid adjustment times (0.5s to 1.0s).
• Showcased low energy consumption (0.1 As to 1.9 As) for extended operation.

Conclusions:

• The developed exoskeleton offers high performance, rapid adjustment, and low energy use.
• The lightweight design is suitable for prolonged use in demanding occupational settings.
• This innovation advances wearable robotic solutions for shoulder support.