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目的探索装显示器头盔对人体的生物动力学效应,为制订头盔的设计标准提供依据。方法用HYBRIDⅢ型假人和志愿受试者,佩戴飞行头盔和装显示器飞行头盔,进行了一系列的弹射试验,弹射动力从0．3到0．8 MPa。测得不同弹射加速度作用下的动力学和运动学数据,并计算了严重指数、头损伤指数和动态响应指数。结果研究发现,在人体头、颈、胸及头盔测量的加速度峰值存在明显超调现象;在颞部和头盔上测量的X轴向的加速度,在装显示器时明显增大;动态响应指数与弹射加速度峰值成线性关系;严重指数、头损伤指数与弹射加速度峰值成指数关系。结论当弹射加速度峰值<20 G时,试验中所用的头盔,无论是否装显示器,其动态响应指数、严重指数、头损伤指数、作用于颈椎的压力和剪力都在人体的耐限内。
Objective To explore the biodynamic effect of the display helmet on the human body and provide the basis for formulating the design standards of the helmet. Methods HYBRID Ⅲ dummy and volunteer participants, wearing flying helmets and flying helmets fitted with monitors, carried out a series of ejection tests with ejection power ranging from 0.3 to 0.8 MPa. Kinetic and kinematic data under different ejection accelerations were measured, and severe index, head injury index and dynamic response index were calculated. Results The study found that there was a significant overshoot of the acceleration peak measured on the human head, neck, chest and helmet. The X-axial acceleration measured on the temporal and helmets increased significantly when the monitor was installed. The dynamic response index and ejection The peak acceleration is a linear relationship; severe index, head injury index and ejection acceleration peak exponential relationship. Conclusions When the peak of ejection acceleration is <20 G, the helmet used in the test, with or without a monitor, has a dynamic response index, a severe index, a head injury index, and the pressure and shear force acting on the cervical spine are within the body’s resistance limits.