Four different categories include; healthy, inner race defect, outer race defect, and double holes in outer race are investigated.
The results show that the EWT provides a good performance in the detection of outer race fault, roller fault, and the compound fault of outer race and roller.
The maximum attenuation occurs at the transmission from inner race to outer race, while the minimum is between the outer race and the housing.
The elastic deformations at the interfaces between gear and shaft, inner race and outer race, outer race and housing are formulated by the corresponding contact stiffness.
The localized defects on both inner and outer race are successfully diagnosed.
The localized faults on outer race, rolling element and inner race are successfully diagnosed.
At the second step, the type of the defect (e.g. inner or outer race) is identified.
Mathematical expressions were derived for inner race, outer race and rolling element local defects.
Outer race and inner race fault simulations are realized in the paper.
The roller nut outer race is fabricated from Haynes Alloy 25, AMS 5759D.
The vibration signals of a rolling element bearings test rig are measured for different outer race fault sizes.
