In the engine’s main bearing fault diagnose, the vibration signal is nonstationary and the law of frequency changing with rotate speed is not clear. So the time-frequency analysis and order tracking was put forward to diagnose the fault. At speed up and 1800r/min speed condition, after set the bearing clearance to 0.08, 0.2 and 0.4mm, the vibration signal’ time-frequency distribution and order was analyzed combined with speed and oil pressure signal, and find there are obvious 108 order component and 2600~3100Hz frequency component. At speed up condition, while the main bearing clearance augments, the 108 order component augment and the 2600~3100Hz frequency component descends. After get parameter of these two signal component at speed up condition, we find that the parameter under main bearing’s normal, gentle and serious wear condition is distributed near 0.0025、0.0100 and 0.0350, the parameter can efficiently distinguish these conditions.
CHENG Li-jun;ZHANG Ying-tang;LI Zhi-ning;REN Guo-quan;MEI jian-min.
Research on fault diagnose of main bearing based on time-frequency analysis and order tracking[J]. Journal of Vibration and Shock, 2012, 31(19): 73-78