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首页> 外文期刊>International journal of crashworthiness >Simulation analysis of human neck injury risk under high-level landing impact
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Simulation analysis of human neck injury risk under high-level landing impact

机译：高空着陆冲击下人颈部伤害风险的仿真分析

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摘要

When a spacecraft lands on the earth by parachute, the crewmen will be subjected to a high-level landing impact which could cause their body injuries in case of emergency. The purpose of this investigation was to analyse the human neck injury risk under the high-level landing impact, and to provide useful information for the protection design of the human-seat system in the spacecraft. On the basis of impact test, a mechanical model of the human-seat system was developed, and the acceleration responses at the seat and cushion were simulated using the finite element method. After the model was calibrated and validated, the forces and moments in the human neck were calculated. The degree of the human neck injury can be judged according to the standard of the human neck injury index (N_(ij) < 1). The results showed that when both horizontal and vertical dropping velocity reach 7.5 m/s, the compressive force and extension moment in the human neck were, respectively, 6.58 kN and 100 Nm; and the injury index of the human neck was 1.81 (more than the critical value 1). It is concluded that under the high-level landing impact, the first reason for cervical fracture is the compressive force, and the second is the extension moment. It is necessary to take measures to reduce them to levels less than tolerance limits.
机译：当航天器通过降落伞降落在地球上时，机组人员将遭受高空着陆撞击，这在紧急情况下可能会导致身体受伤。这项研究的目的是分析高空着陆撞击下人脖子受伤的危险，并为航天器人座系统的防护设计提供有用的信息。在冲击试验的基础上，建立了人体座椅系统的力学模型，并利用有限元方法模拟了座椅和坐垫的加速度响应。在对模型进行校准和验证后，就可以计算出人脖子上的力和力矩。可以根据人颈损伤指数（N_（ij）＜1）的标准来判断人颈损伤的程度。结果表明，当水平和垂直下落速度都达到7.5 m / s时，人体颈部的压缩力和延伸力矩分别为6.58 kN和100 Nm；人脖子的伤害指数为1.81（大于临界值1）。结论：在高空着陆冲击下，颈椎骨折的第一原因是压力，其次是伸展力矩。有必要采取措施将其降低到小于公差极限的水平。

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