3D standard motion time-based ergonomic risk analysis for workplace design in modular construction

Abstract

As construction workers are frequently exposed to ergonomic risks, accurate ergonomic risk analysis for workplace design is needed in order to mitigate risk and, consequently, improve productivity. Researchers have sought to identify ergonomic risks of continuous motions in 3D visualizations to achieve proactive workplace designs. However, the motion time is subjectively determined by designers, leading to variable risk ratings and making it difficult to make decisions on design alternatives. This paper proposes an automated 3D standard motion time-based ergonomic risk analysis method that systematically determines motion times and accurately quantifies ergonomic risks of continuous motions for workplace design. The ergonomic risk of continuous motion is assessed using existing tools such as REBA and RULA by incorporating standard motion times determined by a predetermined motion time system. The effectiveness of the proposed method is validated in a case study of two workplace designs for manual assembly tasks in modular construction.