应急弹射时颅脑损伤的动力分析

Dynamic Analysis of Head Injury in Condition of Airflow

目的：分析飞行员应急弹射时，颅脑对气流阻力和升力的动力响应过程．方法：用ＭＲＩ断层扫描图片直接建立颅脑的三维有限元模型，计算振型、位移、应力和压力等参量．结果：飞行员应急弹射时，生命中枢脑干内脑桥延髓部所受压力最大，是弹射后脑保护的首要部位．结论：最大限度地限制颅脑的前后运动，是保护颅脑行之有效的措施．

Aim: To study the dynamic response course of the head to airflow resistance and airflow lift force when a pilot is shot off an aeroplane. Methods: The finite element model of a human head, the geometric shape of the head obtained directly from pictures of MRI, was used to calculate vibration pattern, displacement, stress and pressure. Results: When a pilot is in case of being shot the maximum value of pressure is at the pons and medulla oblongata, which is the main part to be protected. Conclusion: An effective way to avoid injury to the head is to restrict the head's forward or backward motion in a minimum limits.