基于发动机干扰力矩分析并联贮箱推进剂剩余量

Residual Propellant Calculation of Parallel Tanks Based on Engine Disturbance Torque

关键词:  卫星  推进分系统  推进剂剩余量  轨控发动机  干扰力矩  误差分析

Key words:  Satellite  Propulsion subsystem  Residual propellant  Orbit control engine  Disturbance torque  Error analysis

摘要:

针对传统方法不支持多并联贮箱的推进剂剩余量计算、新研方法需新增设备致重量和成本较高的问题，依据“发动机干扰力矩-卫星质心-推进剂剩余量”三者间的关系，提出了基于发动机干扰力矩计算并联贮箱推进剂剩余量的方法。给出了计算模型，确定了发动机干扰力矩与每台并联贮箱推进剂剩余量之间的关系，给出了数值计算流程，并开展了若干工况计算，结果表明，当并联贮箱排放流量不相等时，卫星质心会偏移，导致发动机干扰力矩增加。最后开展了误差分析，考虑输入参数的工程实际偏差，得出计算方法综合均方根误差约在1%量级。

Abstract:

The traditional methods cannot calculate the residual propellant in parallel tanks. The innovative methods need additional equipment and have disadvantages of big weight and high cost. To overcome the above problems and according to the relationship of engine disturbance torque， satellite mass center and tank residual propellant， a residual propellant calculation method of parallel tanks based on engine disturbance torque is proposed. Firstly， the computational model is given， and the relationship between engine disturbance torque and residual propellant of each tank is determined. The numerical calculation process is given. Secondly， the calculation under different conditions is carried out， and the results indicate that the satellite mass center is shifted with the unbalance masses of propellant in parallel tanks， as a result， the disturbance torque increases. Lastly， the error analysis is carried out， and the comprehensive root mean square error is about 1% with considering the input parameters engineering practical errors.