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<p>Humans experience a vibration during activities like operating machinery equipment, construction work, travelling, etc. Prolonged exposure to these vibrations can cause many health issues, including headache, musculoskeletal strain, and spinal discomfort, especially for extended sitting periods. This study aims to analyze the vibrational response of a human body in a seated posture using three layered finite element model consisting of the skeleton, muscles, and skin representing the 95th percentile of male Indian population. The natural frequency of the seated human body in vertical erect posture in different mode shapes was obtained using modal analysis. The results shows that the deformation decreases with the rise in the natural frequency that is similar to the trend mentioned in the previous studies on human subject in sitting posture. The natural frequencies found in the range from 3.93&#xa0;Hz to 6.69&#xa0;Hz, with maximum deformation seen in the lower arms, hands and head, while leags and lower torso have a minimum deformation as the hips and feet are considered as fixed boundary conditions. The findings will be helpful in the product development of cushion seats, automotive seats, and chairs to reduce the vibration effect.</p>

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Evaluation of Seated Human Body Behavior Using FEM: Implications for Seat Ergonomics

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Sachin Kalsi,
  • Sengundhar Dinesh Kovalan,
  • Ishbir Singh

摘要

Humans experience a vibration during activities like operating machinery equipment, construction work, travelling, etc. Prolonged exposure to these vibrations can cause many health issues, including headache, musculoskeletal strain, and spinal discomfort, especially for extended sitting periods. This study aims to analyze the vibrational response of a human body in a seated posture using three layered finite element model consisting of the skeleton, muscles, and skin representing the 95th percentile of male Indian population. The natural frequency of the seated human body in vertical erect posture in different mode shapes was obtained using modal analysis. The results shows that the deformation decreases with the rise in the natural frequency that is similar to the trend mentioned in the previous studies on human subject in sitting posture. The natural frequencies found in the range from 3.93 Hz to 6.69 Hz, with maximum deformation seen in the lower arms, hands and head, while leags and lower torso have a minimum deformation as the hips and feet are considered as fixed boundary conditions. The findings will be helpful in the product development of cushion seats, automotive seats, and chairs to reduce the vibration effect.