落弹舱的微重力环境

MICROGRAVITY ENVIRONMENT IN DROPCAPSULE

本文首先建立了分析落弹舱运动的各种坐标系,给出了解算姿态运动参数的数学模型.然后根据落弹舱微重力加速度的物理背景,对其微重力环境进行了数学描述和物理解释,推导了舱内任意部位微重力加速度表达式,阐明影响微重力环境的主要因素是气动阻力和姿态角运动.最后分析和近似估算了落弹舱的微重力水平,给出了气动阻力对落弹舱微重力水平影响的数值计算结果:平流层气球在30km以上释放落弹舱,优于5×10^(-2)g的微重力持续时间超过30秒.

In this paper, some coordinate systems used in analysing the dropcapsule motion are buiIt, the mathematical model used in solving the parameters of attitude motion is given. According to the physical background of micro-g acceleration in the dropcapsule, mathematical description and physical explaination of micro-g environment are presented, the expression of micro-g acceleration at arbitrary point in the dropcapsule is led out. This paper points out that the major factors influencing the level of micro-g are aerodynamic drag and attitude motion. Lastly, the levels of micro-g in the dropcapsule are analysed and estimated, the numerical calculations are carried out for micro-g acceleration generated by the drag. The calculation results show that the dropcapsule released from the-height of 30 km and above will provide up to 30-40 seconds of micro-g time with g-levels of <5×10-2g.