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<p>The automotive seat plays a crucial role in providing human comfort when exposed to whole-body vibration (WBV) during travelling, which causes discomfort, lower back pain, spinal injury, etc. This study investigates the effect of the thickness of polyurethane foam (PUF) seat cushion, with a focus on the gluteal region in seated posture without backrest support. A multilayered human anatomical model that consists of skin, muscles, nerves, bone, and organs representing 95th percentile male anthropometry was modelled to analyze the effect of different thicknesses, i.e., 80, 100, and 120&#xa0;mm of PUF, on the value of eigenvalues in the sitting posture. Eigen frequency analysis shows that a cushion with a thickness of 120&#xa0;mm produces the most favorable vibration response, with resonant frequencies closely matching the value obtained from experiments as mentioned in the available literature, and maximum deformation found in the vertical direction. These findings suggest that with the increase in thickness of the seat cushion, there is an enhancement in isolation from vibrations and improves the comfort of occupant, offering practical implications of automotive seat design.</p>

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Effect of Variation in Thickness of Cushion Material on Comfort of Human Subject While Travelling

  • 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,
  • Appurva Jain

摘要

The automotive seat plays a crucial role in providing human comfort when exposed to whole-body vibration (WBV) during travelling, which causes discomfort, lower back pain, spinal injury, etc. This study investigates the effect of the thickness of polyurethane foam (PUF) seat cushion, with a focus on the gluteal region in seated posture without backrest support. A multilayered human anatomical model that consists of skin, muscles, nerves, bone, and organs representing 95th percentile male anthropometry was modelled to analyze the effect of different thicknesses, i.e., 80, 100, and 120 mm of PUF, on the value of eigenvalues in the sitting posture. Eigen frequency analysis shows that a cushion with a thickness of 120 mm produces the most favorable vibration response, with resonant frequencies closely matching the value obtained from experiments as mentioned in the available literature, and maximum deformation found in the vertical direction. These findings suggest that with the increase in thickness of the seat cushion, there is an enhancement in isolation from vibrations and improves the comfort of occupant, offering practical implications of automotive seat design.