关键词: 液体推进剂火箭发动机;监控;故障诊断

Abstract: Using the definition of hydraulic coefficient and existent measurements of pressure or flow in pipes of liquid rocket engine, the pressure and the change amount of hydraulic coefficient will be determined according to appropriate calculation of a certain separate pipe. And the relative critical values will be gived from the practical test results. Meanwhile, monitoring parameters will be predicted by a GM model of Grey Theory, and engine health condition will be analysed early. This algorithm can detect the system fault in rocket engine as early as possible, so that there is enough time to adopt measures for engine.

Key words: Liquid propellant rocket engine;Monitoring;Fault diagnosis