Ergonomic Improvement and Simulation Analysis of Armrests for Uncomfortable Working Environments

Weichao Lin, Siu Shing Man, Kang Ran, Meng Zhang, Guolue Xu, Liang Chen

Abstract: With the prevalence of portable laptops, the limitations of computer workstations are gradually diminishing, and any location furnished with a desk and chair can now function as a workspace. However, it must be acknowledged that frequently having the arm in an uncomfortable working position while operating the mouse is not uncommon. This phenomenon can be attributed to desk and chair design, individual height differences, and workplace requirements. Prolonged use of a computer in incorrect postures may lead to health issues, such as carpal tunnel syndrome, which can harm the wrists and joints and result in persistent pain. Therefore, various armrest products have emerged in the market to assist workers in adjusting their working postures and reducing the occurrence of health problems, such as carpal tunnel syndrome. However, not all arm support products effectively assist users in achieving ergonomic positioning, especially in unfriendly work environments. This research aims to enhance the existing structure of armrests to tackle this problem. 12 male and female subjects representing the 5th, 50th, and 95th percentiles of standard height were selected. These subjects were then asked to engage in computer-related activities using a computer and a mouse. Subsequently, the Rapid Upper Limb Assessment method and SAMMIE software were employed for posture analysis. This study utilized Autodesk Fusion 360 software to redesign the armrest and conducted simulation experiments to perform a comprehensive comparative analysis before and after the improvement.