1School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan, China.
2School of Mechanical and Transportation Engineering, Hunan University, Changsha, China.
Acta Bioeng Biomech. 2024 Jun 3;26(1):143-151. doi: 10.37190/abb-02423-2024-02. Print 2024 Jun 1.
: The aim of this study is to investigate the dynamic and biomechanical response of the pelvis and thoracolumbar spine in simulated under-body blast (UBB) impacts and design of protective seat cushion for thoracolumbar spine injuries. : A whole-body FE (finite element) human body model in the anthropometry of Chinese 50th% adult male (named as C-HBM) was validated against existing PHMS (Postmortem Human Subjects) test data and employed to understand the dynamic and biomechanical response of the pelvis and thoracolumbar spine from FE simulations of UBB impacts. Then, the protective capability of different seat cushion designs for UBB pelvis and thoracolumbar injury risk was compared based on the predictions of the C-HBM. : The predicted spinal accelerations from the C-HUM are almost within the PHMS corridors. UBB impact combined with the effects from physiological curve of the human thoracolumbar spine and torso inertia leads to thoracolumbar spine anterior bending and axial compression, which results in stress concentration in the segments of T4-T8, T12-L1 and L4-L5. Foam seat cushion can effectively reduce the risk of thoracolumbar spine injury of armored vehicle occupants in UBB impacts, and the DO3 foam has better protective performance than ordinary foam, the 60 mm thick DO3 foam could reduce pelvic acceleration peak and DRIz value by 52.8% and 17.2%, respectively. : UBB spinal injury risk is sensitive to the input load level, but reducing the pelvic acceleration peak only is not enough for protection of spinal UBB injury risk, control of torso inertia effect would be much helpful.
本研究旨在探讨模拟下体爆炸（UBB）冲击下骨盆和胸腰椎的动态和生物力学响应，并设计用于保护胸腰椎免受损伤的坐垫。我们使用符合中国人 50 百分位成年男性解剖特征的整体式有限元（FE）人体模型（命名为 C-HBM），对现有的尸体人体试验（PHMS）数据进行验证，并将其应用于通过 FE 模拟 UBB 冲击来理解骨盆和胸腰椎的动态和生物力学响应。然后，根据 C-HBM 的预测，比较了不同坐垫设计对 UBB 骨盆和胸腰椎损伤风险的保护能力。C-HUM 预测的脊柱加速度几乎都在 PHMS 范围内。UBB 冲击与人体胸腰椎生理曲线和躯干惯性的影响相结合，导致胸腰椎前弯和轴向压缩，导致 T4-T8、T12-L1 和 L4-L5 节段的应力集中。泡沫坐垫可有效降低 UBB 冲击下装甲车辆乘员胸腰椎损伤风险，DO3 泡沫的保护性能优于普通泡沫，60mm 厚的 DO3 泡沫可使骨盆加速度峰值和 DRIz 值分别降低 52.8%和 17.2%。UBB 脊柱损伤风险对输入载荷水平敏感，但仅降低骨盆加速度峰值不足以保护脊柱免受 UBB 损伤风险，控制躯干惯性效应会有很大帮助。
