[Design of wearable auxiliary device based on upper limb lifting workers and ergonomics simulation analysis]

Area of Science:

• Ergonomics and Occupational Health
• Biomechanics
• Wearable Technology

Background:

• High incidence of work-related musculoskeletal disorders (WMSDs) in upper limb lifting operations poses a significant challenge.
• Existing solutions may not adequately address the physical strain on arm muscles during lifting tasks.

Purpose of the Study:

• To design and evaluate a wearable auxiliary device aimed at reducing WMSDs in upper limb lifting workers.
• To assess the device's effectiveness in mitigating muscle tension and improving user comfort.

Main Methods:

• A wearable auxiliary device featuring an adjustable back bracket and a torsion spring mechanism was designed.
• 3D modeling using SolidWorks and digital human simulation with Jack software were employed for virtual prototyping and analysis.
• Comparative analysis using the Rapid Upper Limb Assessment (RULA) scale, Krist comfort score, and two-handed reachable domain simulations was conducted.

Main Results:

• The wearable auxiliary device effectively reduced arm muscle tension during simulated upper limb lifting.
• Post-intervention assessments indicated a lower risk of WMSDs.
• Improved comfort scores and enhanced two-handed reachable domain were observed after wearing the device.

Conclusions:

• The designed wearable auxiliary device is a viable solution for mitigating WMSDs in upper limb lifting workers.
• The device's ability to reduce muscle strain and improve comfort demonstrates its potential for enhancing workplace safety.
• Further implementation and studies are warranted to validate these findings in real-world occupational settings.