关键词: 液体推进剂火箭发动机;涡轮泵;故障检测

Abstract: In order to improve the reliability,real-time capability and validity of turbopump fault detection system(TP-FDS) for a large liquid rocket engine(LRE),its hardware construction and layout,multi data acquiring cards synchronization,and algorithms integration were studied.As for the TP-FDS hardware,the data logger and saving subsystem(DLSS) was constructed based on industrial computer,while the real-time fault detection subsystem(RT-FDS) and post-test data analysis subsystem(PT-DAS) were developed based on PXI bus;As for the TP-FDS software,3 real time algorithms and 6 types(time domain,frequency domain etc.) post test data analysis algorithms were integrated to enhance its validity of fault detection and data analysis.Then,with the help of historical data from LRE test as well as real-time data from rotor test platform,the TP-FDS was validated.In this case,the TP-FDS has real time fault detection ability,and its mean fault detection time is less than 335ms,while its fault detection probability achieves 97%.At the same time,it can effectively diagnose the early,medium-term,and terminal rub-impact of turbopump rotor.

Key words: Liquid propellant rocket engine;Turbopump;Fault detection