基于hp自适应伪谱法的可调推力最优离轨研究

Optimal deorbit research of spacecraft with variable thrust based on hp-adaptive pseudospectral method

根据不同最优化指标要求,利用hp自适应伪谱法,对比分析了固定推力和可调推力制动离轨时的参数变化情况。通过研究发现,以燃料最省为优化指标,采用可调推力制动时,飞行器过渡段飞行时间更长,燃料消耗相对较小;而在时间最短指标要求下,可调推力制动虽消耗大量燃料,但能大大缩短过渡段飞行时间,有利于航天器在执行紧急任务时的快速返回。

Considering different optimal objects,the hp-adaptive pseudospectral method was used to analyze the comparison of flight parameters when the vehicle deorbit with the control of fixed thrust and variable thrust.The results showed that with the index of minimal fuel,using variable thrust would take more time during transition than using fixed thrust,and could economize little fuel;however,with the index of shortest time,variable thrust could shorten the flying time obviously during transition by consuming more fuel,and was propitious to the spacecraft rapid return with emergency missions.