Abstract

To demonstrate the effect of body posture on the occupant dynamic response under a spacecraft high-level re-entry acceleration overload, seat-dummy system models with typical body positions, including supine and lying positions, are established in this study using Pro-E and HyperWorks software. A Human Model for Safety (HUMOS version II) dummy was used in the model. Seat-dummy system models were calibrated and validated according to actual centrifugal test data. The effect of body posture on the overload response of key body organs, including the heart, lung, diaphragm, liver, and abdominal viscera are demonstrated and analyzed under a high-level acceleration overload (a peak value of 6.4 g as input). Simulation results show that the displacement and deformation of the diaphragm are the most important factors affecting human tolerance to re-entry overload. The acting force of the diaphragm from other organs’ inertial reaction in supine position is larger than that in the lying position. Therefore, spacecraft designers should focus more on the mechanical status of human internal organs and provide a body posture for better protection of the crew during spacecraft re-entry.

摘要

为了证明航天器高水平再入加速度过载下身体姿势对乘员动态响应的影响，本研究使用 Pro-E 和HyperWorks 软件。模型中使用了安全人体模型（HUMOS 版本 II）假人。根据实际离心试验数据对座椅假人系统模型进行了校准和验证。在高水平加速度过载（峰值为 6.4 g 作为输入）下，展示和分析了身体姿势对心脏、肺、横膈膜、肝脏和腹部脏器等关键身体器官过载反应的影响。仿真结果表明，膜片的位移和变形是影响人类对再入过载耐受能力的最重要因素。仰卧位其他器官惯性反应对横膈膜的作用力大于卧位。因此，航天器设计人员应更多地关注人体内部器官的机械状态，并提供一个身体姿势，以便在航天器再入过程中更好地保​​护乘员。