嫦娥三号推进系统在轨推进剂耗量计算方法

Method of onboard propellant consumption calculation for Chang'e-3 propulsion system

嫦娥三号推进系统推进剂剩余量是探测器每次变轨前需要确认的重要数据,液体推进剂剩余量计算误差会导致对嫦娥三号探测器质量估计错误,从而导致预期目标与变轨结果发生偏差,需要对轨道进行修正,导致在轨推进剂消耗量额外增大.因此,选择合理的在轨推进剂耗量计算方法是圆满完成嫦娥三号探测器飞行任务的保障。通过比较各种推进剂剩余量测量技术的测量精度、测量可靠性及使用成熟度,同时考虑嫦娥三号推进系统的实际产品配置情况和研制试验情况,嫦娥三号探测器在轨推进剂耗量计算采用加速度计法和薄记法进行综合估算.其中,轨道机动时主要采用加速度计法进行计算,其他时段主要采用薄记法进行计算。飞行试验数据分析表明,该方法有效且精度较高,可以推广应用于空间推进系统在轨推进剂耗量计算。

The liquid propellant surplus in Chang＇e-3 propulsion system is an important data for detector to affirm before each orbital transfer. Calculation error of the liquid propellant remaining can lead to mass miscalculation of Chang＇ e-3 detector, and cause deviation from the expectative target of orbit transfer, and result in an extra increase of liquid propellant consumption due to orbit correction. Therefore, it is very important to select a reasonable calculation method of onboard propellant consumption for Chang＇e-3. According to the comparison results of detection accuracy, reliability and maturity of propellant remaining detection technology, the comprehensive estimation with both accelerometer method and bookkeeping method was adopted for liquid propellant consumption of Chang＇e-3 after consideration of actual configuration, development and test of Chang＇e-3 propulsion system. Accelerometer method is mainly used in orbit maneuver, and bookkeeping method is used for other period. Analysis of the flight test data shows that it is an effective method with high accuracy. This method can be applied to the onboard propellant consumption calculation of space propulsion system.