title: [Study on weightlessness dynamics simulated by neutral buoyancy in air-driven shell].
abstract: 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.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China. fqy02@mails.tsinghua.edu.cn
authors.forename: Qing-yi
authors.initials: QY
authors.lastname: Feng
authors.forename: Jun-feng
authors.initials: JF
authors.lastname: Li
authors.forename: Tian-shu
authors.initials: TS
authors.lastname: Wang
mesh_terms: D000392:Air Movements; D000465:Algorithms; D004867:Equipment Design; D008962:Models, Theoretical; D010313:Partial Pressure; D018474:Weightlessness Simulation