Ergonomic analysis of seats of human powered vehicles by digital human modeling for better ride comfort

Abstract

Rickshaws are essential for affordable and accessible transportation, particularly in densely populated urban areas. It is important to ensure the comfort of the rickshaw driver as it directly affects their health, well-being, and job satisfaction. It also influences customer satisfaction and safety. This study focuses on modifying the rickshaw driver's seat to enhance comfort while ensuring ergonomic principles are met. As proper cushioning, support, vibration absorption, and adjustability are key factors, this study involves measurements of rickshaw frames, CAD design of seat structures, ergonomic analysis using CATIA V5, and experimental vibration analysis. RULA and REBA analyses are performed on digital human models to evaluate posture and musculoskeletal risks associated with the conventional seat design. Modifications were suggested based on the analysis. Modified seat designs were introduced and analyzed identically to the conventional design using anthropometric data. Adjustments to handle height positively impacted driver comfort and ergonomics. These ergonomic analyses indicate that the modified design can provide more comfort to the driver. Afterward, vibration analysis is done as the springs in the driver's seat absorb shocks and vibrations, reducing fatigue and minimizing the risk of musculoskeletal issues. They contribute to overall comfort during long hours of driving. Vibration analysis is conducted to compare the conventional and modified seat designs. The modified design demonstrated better vibration absorption, indicating improved comfort for the driver. Overall, the study provides valuable insights into the importance of rickshaw driver comfort, the role of seat design and springs, and the methods to optimize comfort and performance through ergonomic analysis and design modifications.