Model Recognition of Astronauts Blood Flow Change Under Sustained +Gz Acceleration   

在+Gz作用下飞行员的血容量变化数学模型的辨识(英文)

作　　者：钟秋海[1] 张高明[1] 王庆林[1] 李宪玉[2] 

机构地区：[1]北京理工大学自动控制系,北京100081 [2]空军第四研究所,北京100036

出　　处：《Journal of Beijing Institute of Technology》1999年第3期225-231,共7页北京理工大学学报（英文版）

基　　金：国防科技预研基金

摘　　要：Aim Using animals as object of experiment to acquire various patterns of low cerebral blood pressure and reduced blood capacity in cerebral tissues of astronauts due to the load of acceleration. Methods The isotope tracking technique was applied to mark the blood and record the dynamic curves of cerebral blood flow changes under various accelerations, and the relevant mathematical model was set up using the method of system recognition. Also the method of factor analyzing was used to select two out of the data collected by eight sensors as two factors. Results One of the two factors reflects the various patterns in the astronaut's upper body, the other for the lower body. Parameters of rise time, delay time and steady value reflect the results under different acceleration. Conclusion Whether for the upper body or the lower body, blood flow changes can be considered as a second order system model. This method provides a new technique and method of doing research on astronaut's endurance of acceleration and selecting astronauts.目的　用动物作实验对象来研究飞行员对加速度负荷引起头部血压低、脑组织血流降低的变化规律． 方法　用同位素示踪技术标记血液，记录在不同加速度作用下的脑血容动态变化曲线，用系统辨识方法建立相应的数学模型． 用因子分析法从８ 个探头的数据中分离出２ 个因子进行辨识． 结果　两个因子中的一个因子反映上体的规律，另一个因子反映下体的规律． 上升时间、延迟时间、稳态值等参数可反映不同ｇ 值作用的结果． 结论　无论上体或下体血容量变化规律都可用二阶模型来表达． 此种方法为飞行员承受加速度耐力的研究和选拔飞行员提供了一项新技术和新方法．

关 键 词：ASTRONAUTS system recognition blood volume mathematical model ACCELERATION 

分 类 号：R852.21[医药卫生—航空、航天与航海医学]