Biomechanical Response And Ergonomics Design Of The Musculoskeletal Model Based On AnyBody

Lower Back Pain (LBP) is a common health problem of drivers, sitting in com-bination with whole-body vibration (WBV) and award postures does increase the association with the presence of LBP. Drivers are often exposed to vibration envi-ronment and need to maintain a fixed position for long time, therefore, the estab-lishment of seated human musculoskeletal model and the study of the biomechanical response of the human body in different sitting posture and vibration conditions have great significance for studies of occupational diseases.This study analyzed the impact of poor posture and vibration conditions on human musculoskeletal system based on Anybody Modeling System (AnyBody Technology A/S, Aalborg, Denmark). This study builds seated human musculoskel-etal model and studies factors which may affect the musculoskeletal diseases of drivers.The main works are as follows:1. Biomechanical response of the musculoskeletal system to sitting posture us-ing seated modelThis study analyzed how poor posture affects human musculoskeletal system and provides a theoretical basis for the design of the seat. This study used Vicon Motion System (Vicon, Inc., Oxford, UK) motion capture software to capture sub-jects’sitting posture, force plate data and displacement of optical markers. The mo-tion capture data was stored in the C3D file. These resources were input into Any-Body Modeling System to enable the seated human model. Biomechanical responses of the musculoskeletal system to sitting posture were calculated based on the inverse dynamic approach. The result showed that the pressure between L4-L5 on upright sitting position is minimum. The compressive pressure of forward sitting is larger than backward.2. Biomechanical response of the musculoskeletal system to whole body vibra-tion using a seated driver modelThe comfort ability seated model was established based on AnyBody musculo-skeletal modeling software, the reclining angle effects on muscle activity were ana-lyzed. Besides, combined effects of vibration frequencies and backrest angle on muscle activity of spine, abdomen, and leg were analyzed. The results indicated that the vibration frequency and backrest inclination both have a significant impact on muscle activity of human.3. Vibration experimentTen healthy subjects were exposed to whole body vibration (WBV) with five frequencies (3,4.5,6,7, and 8 Hz) in the vertical direction in a randomized order on three separate days. The displacement of the seat-pan and head was measured using a hybrid Polaris spectra system to obtain the seat-to-head (STH) transmissibility. Muscle oxygenation was measured using near-infrared spectroscopy instruments. The validity of the model was tested using STH transmissibility and muscle oxygen-ation. The combination of vibration and forward inclination of the backrest can in-fluence the muscle activity.