Abstract:

 In order to determine the fault position of a turbine pump bearing and avoid the ambiguity of the fault diagnosis of the turbine pump bearing by the characteristic frequency, a new method of the bearing fault diagnosis is proposed by using the phase information of the amplitude-time curve. Just like GPS, the high speed rolling element bearing and four vibration signal sensors are set in the rectangular coordinate system with known coordinates. The exactly arrival moments of the characteristic frequency signals to the sensors can be figured out accurately by the amplitude-time inflection algorithm from the vibration data. The vibration source position coordinates can be deduced from these four moments and the four known sensor’s coordinates. According to the vibration source coordinates, whether it is the bearing failure because of different element bearing occupying different space can be determined. The simulation results show that the method is feasible theoretically.

Key words:  Rocket engine, Fault diagnosis, Navigation and location, Sensor array, Time delay