Design and verification of accurate measurement of human body mass in microgravity environment
10.16289/j.cnki.1002-0837.2025.01009
- VernacularTitle:微重力环境下人体质量准确测量设计与验证
- Author:
Zhe ZHANG
1
;
Weibo LIU
;
Zhi XU
;
Yan ZHANG
;
Jianping GUO
;
Yu ZHANG
;
Sheng Yuan WANG
;
Yong XUAN
;
Yue GAO
;
Mi JIANG
Author Information
1. 中国航天员科研训练中心,北京 100094
- Keywords:
microgravity environment;
human body mass measurement;
constant force measurement;
constant force mechanism;
four-bar linkage;
posture stabilization brace
- From:Space Medicine & Medical Engineering
2025;36(1):50-57
- CountryChina
- Language:Chinese
-
Abstract:
Traditional mass measurement methods are not applicable in microgravity environments,and the main challenge for in-orbit body mass measurement technology based on inertial principles is to address the random errors brought about by the weightless environment.These include additional torques due to shifts in the center of mass,nonlinear accelerations due to non-rigid human bodies,mechanical energy consumption due to organ vibrations,and random vibrations of the measurement device itself.To address the above difficulties,the project proposes a technical scheme based on the principle of linear acceleration,designs and constructs a ground-specific air-floating experimental and simulation platform,studies key data such as motion trajectory,acceleration change,and vibration frequency amplitude during the mass measurement process,and simulates the changes in the center of mass and random vibrations of the human body in a weightless environment.The project has designed an adjustable posture bracket to adapt to changes in the center of mass,enhance body restraint,and greatly reduce shaking;it has also developed an integrated four-bar linkage motion guidance mechanism,high-precision integrated photoelectric distance measurement,and modular motion constant force measurement device to ensure the accurate measurement of acceleration and constant force data.The product has undergone simulation calculations,ground human applicability tests,and in-orbit applicability verification in the space station.Ground test results show that the device achieves a body mass measurement accuracy better than 0.5%,and the dispersion is better than 0.38%;after flight mission verification and evaluation,the in-orbit body mass measurement dispersion is less than 0.4%,which is superior to the SLAMMD,a mass measurement device of the same principle on the International Space Station,and is at the forefront internationally,achieving accurate body mass measurement.
