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目的探讨飞船返回着陆时不同强度和不同姿态冲击下人体动态响应的规律。方法 5名健康男青年 ,以仰卧 2 0°,承受 4～ 1 0G、5 0～ 80ms ;仰卧 30°～ 60° ,1 0G、5 0ms,半正弦脉冲的着陆冲击。分别记录冲击塔平台 ,座椅及人体头、肩、胸和髂处的Z和X向加速度及被试者心电图。结果随着陆冲击强度的增加 ,人体头、肩、胸和髂处X向加速度响应值均增大 ;2 0° ,1 0G冲击时 ,头Z向和X向加速度峰值超调量分别为 93%和 1 0 2 % ;随仰卧角度的增加 ,人体头、肩、胸和髂X向加速度响应均下降 ,而头Z向加速度及超调量在 40°仰卧角时最小。结论人体对着陆冲击的传递函数表明 ,人体具有多阶共振频率 ,分别为 2 5Hz、34Hz、39Hz、43Hz、5 0Hz、64Hz和 70Hz。
Objective To explore the dynamic response of human body under the impact of different strength and different attitude when the spacecraft returns to landing. Methods Five healthy male youths were supine 20 °, undergoing 4 ~ 10G, 50 ~ 80ms; supine 30 ° ~ 60 °, 10G, 5 ms, landing impact of the half-sine pulse. The Z and X accelerations of the platform, the head and the human head, shoulders, chest and iliac of the impact tower, and the electrocardiogram of the subjects were recorded respectively. Results The responses of X-direction acceleration of the head, shoulder, chest and iliac increased with the increase of the impact strength of the land. The peak overshoots of the acceleration in the Z-direction and the X-direction at the angles of 0 ° and 10 G were 93% And 102% respectively. With the increase of supine angle, the responses of X, Y and Z in the head, shoulder, chest and iliac decreased, while the acceleration and overshoot in the Z direction were the smallest at the supine angle of 40 °. Conclusion The transfer function of the human body to the landing shock shows that the human body has multi-order resonance frequencies of 25Hz, 34Hz, 39Hz, 43Hz, 50Hz, 64Hz and 70Hz, respectively.