气动壳体结构中性浮力模拟失重动力学分析研究

Study on Weightlessness Dynamics Simulated by Neutral Buoyancy in Air-driven Shell

目的为中性浮力模拟失重试验提供理论支持。方法将气动壳体结构看作质量恒定、体积可变的刚体结构,研究建立了气动球壳的刚体动力学数学模型和气动力学数学模型,在此基础上,通过计算机仿真研究了气动球壳结构在定质量流量供气条件下的运动规律和余压变化规律等。结果定质量流量供气的气动壳体结构的中性浮力平衡是不稳定的。结论气动壳体结构的中性浮力平衡控制是实现稳定可靠的中性浮力平衡的核心问题。

Objective To provide theoretical support for weightlessness experiment simulated by neutral buoyancy. Method 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. Result Under constant mass-flux condition, neutral buoyancy balance of air-driven spherical shell was unstable. Conclusion The key to achieve stable neutral buoyancy balance is the design of the system controller.