The Designing And Validating Of Turbopump Condition Monitoring System

The turbopump is an important part of the liquid rocket engine, whose task is fuel transporting. The working condition of turbopumps is extremely complex and harsh because of the high temperature, high pressure and strong corruption. Once arising, A sudden fault may develop rapidly into a catastrophic accident.Hence the research of real time health monitoring system of turbopump is being paid a wide attention. For the ground firing test of liquid rocket engine, real time monitoring is expected to reflect the conditon of turbopump as comprehensively as possible. While the existed systems in our country, most of which are based on PCI or PXI architecture and general processors, are of limited processing capability. On another hand, for the application of on-board turbopump monitoring, a light system of small scare is required, which may focus on the detection of specified key fault with only a small number of signals. The faults are expected to be detected as early as they can for buying precious time of reaction.For the above reasons, the DSP technology is introduced in turbopump monitoring system for the application of ground firing test in order to fulfill the speed requirment of mass signal processing. And the stochastic resonance method of weak signal extraction is brought in for the detecting of specified turbopump fault. The main contents include:1. The structure and working characteristics of turbopump are analysed and fault features are then selected, based on which the solution of real time monitoring system based on DSP is put forward.2. Based on the DSP technology, the hardware of monitoring system are designed according to the system solution.3. The fault detection algorithms of turbopump is researched based on the selected fault features, including time domain, frequency domain, and order domain algorithm. According to the requirements of DSP and real time processing, improvements are done for these algorithms, which set the foundament of DSP software programing and argorithm embeding.4. For the specified fault detection of on-board turbopump monitoring, the stochastic resonance method is introduced in order to solve the problem of weak signal extraction.With a system prototype, the basic function of turbopump monitoring system is tested using the history data of ground firing tests. The result shows that, the hardware is well designed and the system is capable of extracting fault features. In addition, the stochastic resonance method is tested using the data of fault bearing, the result of which shows that this method is capability of extracting specified weak signal and provides a new way for fault detection of on-board turbopump monitoring.