[Study on weightlessness dynamics simulated by neutral buoyancy in air-driven shell].
OBJECTIVE
To provide theoretical support for weightlessness experiment simulated by neutral buoyancy.


METHODS
An air-driven shell structure was simplified into a rigid body with constant mass and variable volume. Then, rigid body dynamic model and gasdynamic model of air-driven spherical shell were established. Finally, the kinematical laws and the residual pressure variety laws of air-driven spherical shell were obtained under constant mass-flux condition by computer simulation.


RESULTS
Under constant mass-flux condition, neutral buoyancy balance of air-driven spherical shell was unstable.


CONCLUSIONS
The key to achieve stable neutral buoyancy balance is the design of the system controller.
Feng
Qing-yi
QY
Institute of Space Medico-Engineering, Beijing, China. fqy02@mails.tsinghua.edu.cn
Li
Jun-feng
JF
Wang
Tian-shu
TS
D000392:Air Movements; D000465:Algorithms; D004867:Equipment Design; D008962:Models, Theoretical; D010313:Partial Pressure; D018474:Weightlessness Simulation