Characteristics of Human Body Dynamic Responses to Landing Impact in Supine Position
Abstract：Objective To study the characteristics of human body dynamic responses to landing impact.Method Five healthy young men were exposed to 4～10 G for 50～80 ms half-sine acceleration pulse at 20° supine angle and 10 G for 50 ms impact at 30°～60° supine angles. The acceleration curves on the dropping platform of the impact tower, the seat, the human head, shoulder, chest and ilium, as well as ECG of the subjects were recorded. Result The peaks of acceleration at the subject head, shoulder, chest, and ilium along chest-back direction rose with the increase of the impact level. The overshoots of acceleration at the subject head along head-ilium direction and chest-back direction were 93% and 102% respectively for 10 G at 20° supine angle. With increase of supine angle, acceleration response at the subject along chest-back direction decreased. Acceleration response at the subject head along head-ilium direction was minimum at 40° supine angle. Conclusion Transfer function of the human body to landing impact demonstrated that human body had a series of resonance frequencies which were 25 Hz, 34 Hz, 39 Hz, 43 Hz, 50 Hz, 64 Hz,and 70 Hz respectively.
Keywords：landing impactdynamic responsesimpact accelerationsupine position
Publication Date：2003-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 5-9 )