Heuristic Explanation of Journal Bearing Instability
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
A fluid-filled journal bearing is viewed as a powerful pump circulating fluid around the annular space between the journal and the bearing. A small whirling motion of the journal generates a wave of thickness variation progressing around the channel. The hypothesis that the fluid flow drives the whirl whenever the mean of the pumped fluid velocity is greater than the peripheral speed of the thickness-variation wave is discussed and compared with other simple explanations of journal-bearing instability. It is shown that for non-cavitating long bearings the hypothesis predicts instability onset correctly for unloaded bearings but gradually overpredicts the onset speed as the load is increased.
- Operations Research
- Machinery and Tools