| ¥´. Type 5 |
| A Simulation Study of Defects in a Rolling Element Bearing using FEA |
| Authors : |
Prof. Yimin Shao(Chongqing University)
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| An internal impact usually happens when there is a small defect in one part of rolling
bearings. The Fault signal from this impact is always masked by different noises such as
strong vibrations from other parts and the random noise of instrumentation, which makes it
difficult to extract an accurate feature signal for early fault diagnosis. In this paper, a
simulation study is conducted using the method of finite element analysis (FEA) to
understand the vibration characteristics from the small impact. The vibration responses
have been modelled based on a typical bearing assembly. Common faults including outer
ring defect, inner ring defect and rolling ball defect are simulated and their vibration
responses are compared between different faults and at different locations in the bearing
housing. The results obtained have shown that under the same defect size, the vibration
from the outer ring is the highest whereas that from the rolling ball is the smallest. In
addition the vibration close to the mounting hole attenuates considerably compared to that
close to outer ring. These findings provide fundamental information to place vibration
sensors and to analyse vibration signals. |
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