临近空间落球探测仿真分析

目的基于硬质落球,分析探测临近空间大气密度和水平风场的载荷需求和探测性能。方法仿真计算自由下落探测段受力情况,建立运动方程。以假定释放条件,仿真落球的探测过程,给出各作用力量级。结果面质比的变化不能改变气动力范围。相同加计灵敏度下,增大面质比可提高探测高度。150 km以下的探测中可忽略光压力,探测到水平风场米级变化的加计灵敏度需求为1×10~(-5)m/s~2。结论面质比的变化不能改变气动力范围。相同加计灵敏度下,增大面质比可提高探测高度。

Simulation Analysis of Falling Ball Detection in Near Space

The work aims to analyze the atmospheric density of near space and the load demand and detection performance of wind field based on hard falling ball. The force of free falling detection section was subject to simulating calculation and then a motion equation was established. Taking the assumed release condition as initial state, the detection process was simulated, and the acting force levels and ranges were given. The variation of the area-to-mass ratio (AM) could not change the range of aerodynamic force. Increased AM could improve detection height if at the same accelerometer sensitivity. The solar pressure could be neglected in the detection below 150 km. The meter level changes in horizontal wind field could be detected in case of accelerometer sensitivity 1×10-5 m/s2. In conclusion, the variation of the area-to-mass ratio (AM) cannot change the range of aerodynamic force. Increased AM can improve detection height if at the same accelerometer sensitivity.