航天器某子系统在轨诊断推理技术研究

Research on In-orbit Diagnosis Reasoning Technology of a Spacecraft Subsystem

航天器某子系统负责器上去除CO2功能,其工作的安全性和可靠性直接影响任务的成败,需要对子系统进行在线监测,及时发现故障并快速隔离,以方便维修和更换,使系统恢复至正常状态。本文针对该子系统的周期工作和启动工作两种测试模式,给出了周期和启动两种诊断推理方法,解决了实际中可能会出现的数据缺失问题。最后,建立子系统测试性诊断模型,给出了诊断推理程序,利用两种诊断推理方法进行了诊断设计,提高了子系统的故障快速检测和隔离能力。

A subsystem of the spacecraft is responsible for removing CO2 from the device.The safety and reliability of its work directly affect the success or failure of the mission,so online monitoring of the sub-system is needed to timely find faults and quickly isolate it,so as to facilitate maintenance and replacement,and restore the system to a normal state.Aiming at the two testing modes of the subsystem,this paper presents two diagnostic reasoning methods of cycle and start,and solves the problem of missing data that may occur in practice.Finally,the subsystem testability diagnosis model is established,the diagnostic reasoning program is given,and the diagnosis design is carried out by using two diagnostic reasoning methods,which improves the subsystem’s ability of rapid fault detection and isolation.