基于直线加速度的人体质量测量方法及其地面实验研究

On-ground experimental investigation of a linear acceleration based body mass measurement method

微重力条件下的人体质量测量方法和设备对于长期载人航天的航天员健康监测具有重要意义。该文比较了可行的测量方法,选取了基于Newton第二定律的直线加速度法进行地面实验研究。搭建了实验平台,利用弹簧-凸轮的恒力机构产生恒定拉力牵引人体做直线匀加速运动,利用气浮台模拟水平方向微重力条件,对45～90kg的刚性砝码和15名50～60kg的人体被试进行测量实验。实验结果显示:该实验平台符合匀加速直线运动规律,标定后对刚性砝码测量精度优于0.2kg,对于人体测量结果稳定性较高,整体精度在0.5kg左右。可见,直线加速度方法可以用于微重力下人体质量测量,通过延长运动时间、加强人体的固定和增加被试者训练等方法应可得到较好精度。

Human body measurements in micro〉gravity environments are important for health monitoring of astronauts in long：term manned space missions. This study analyzes the linear acceleration method which is based on Newton＇s second law. An onground experimental platform was developed consisting of a spring cam assembly to generate a constant pulling force to linearly accelerate the human body and an air bearing table to simulate the micro-gravity environment in the horizontal directions. Rigid weights from 45 90 kg and 15 human subjects from 50- 60 kg were tested. The results show that the method satisfies Newton＇s second law with measurement accuracy of 0.2 kg for the rigid weights. Good repeatability is observed for the humans and the accuracy is approximately 0.5 kg. The results indicate that the linear acceleration method is useful for human body mass measurements in micro-gravity environments and that the measurement error can be reduced by longer motion times, better body restriction and proper training of the human subjects.