Due to improper assembly of rolling bearing, bad lubrication, corrosion and overload premature failure reason . In this condition will run vibration of rolling bearings of the condition monitoring and fault diagnosis method is one of the vibration analysis.

In one vessel in such an engine vibration test device, it was found that the host bearing fault features have appeared, and after three precision vibration test, both confirmed the fault exist.

For the three 7330 AC single radial ball thrust bearing. NSK bearings rolling elements center rolling track circle diameter 235 mm and 150 mm diameter, roller diameter of 50.75 mm, rolling body number 13, contact angle 25 °.

 
In order to accurately reflect the true, main force bearing vibration condition, chosen in the measuring point from bearing recently, and only one surface and bearing of the place. Consider the main engine thrust bearing the actual installation position
 
and bearing stress direction. In addition, must carry on the multiple vibration signal collection, analysis, comprehensive comparison, to ensure that the conclusions accurately.



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