Abstract: It is introduced a distilling character parameter method investigated for space aerocraft propulsion system using improved time-series method. Based on the method, corresponding character parameters were distilled and the threshold was gotten for fault detection according to the real data from the space aerocraft thrust system. It is improved that the threshold is more sensitive to leakage than that from field experts. Combined with more parameters, it can accomplish fault detection successfully and has practical feasibility in engineering application.

Key words: Low thrust propulsion;Fault detection;Characteristic parameter;Mathematical model

摘要： 介绍了利用改进时序模型提取空间飞行器推进系统特征参数的方法。利用此方法,结合某飞行器推进系统试验的实测数据,提取出了相应的特征参数,并以此为基础得出了故障判据的阈值。数据回访表明此阈值较领域专家提供的阈值对“泄漏”故障更为敏感,结合多参数辅佐检测,可以很好地完成推进系统的故障检测功能,具有工程实用可行性。

关键词: 小推力推进;故障检测;特征参数;数学模型