【摘要】 在载人月球探测任务中,为准确预测携带大量推进剂航天器的质量特性和在轨寿命以便进行飞行任务规划和控制,需要精确测量低重力条件下航天器推进剂剩余质量。文章对基于气体注入法的航天器贮箱推进剂剩余量测量精度和关键影响因素进行了仿真研究,研究结果表明:随着航天器贮箱中推进剂剩余量的不断减少,气体注入法测量精度不断降低;测量实施过程中贮箱压力值变化幅度越大,测量精度越高;测量精度受测量系统温度传感器精度影响相对较小,受测量系统压力传感器精度影响较大,呈近似线性相关;基于气体注入法的高精度推进剂剩余量测量方法,可通过选用高精度压力传感器和增大测量实施过程中贮箱压力值变化幅度实现。更多还原

【Abstract】 In manned lunar exploration mission,the high-precision propellant measurement in a low-gravity environment is needed to properly predict the orbital lifetime and maneuverability of the spacecraft for the mission planning and controlling. This paper studies the measuring accuracy and its key factors of a tank residual propellant measurement for manned spacecraft program based on gas injection method. The results show that ①the measuring accuracy decreases with the consumption of propellant in the tank; ②the larger pressure change in the tank when propellant measurement can raise the measuring accuracy; ③it is confirmed that the temperature sensor precision has little effect on the measuring accuracy while the pressure sensor precision has a significant influence on the measuring accuracy with an approximate linear relationship and ④the high accuracy propellant measurement can be achieved by applying the high pressure sensor precision and increasing pressure change in the tank during measurement.更多还原