Typical fault diagnosis method for high-speed turbopump of Liquid Rocket Engine

Turbopump is a high-fault-rate component in Liquid Rocket Engine (LRE). In this paper, the reasons of the typical fault of turbopump rotor blade abruption and abscission are analyzed. And, by the method of dynamic analysis, the vibration features of the fault are studied to select the frequency features diagnosing effectively the fault. Then, the extraction method of the features is researched. By means of transform processing, the speed variation influence on the vibration frequency is driven out to extract the stabile frequency features. With the fault data in turbopump historical test, it is shown that the fault of turbopump rotor blade abruption and abscission can be detected and diagnosed effectively by tracking the amplitude variation of the feature frequency.