Journal
FRICTION
Volume 9, Issue 6, Pages 1776-1783Publisher
SPRINGER
DOI: 10.1007/s40544-020-0448-2
Keywords
long journal bearings; stability threshold speed; stability boundary; journal center trajectory
Categories
Funding
- Hubei University of Arts and Science [2059023]
- Project of Hubei University of Arts and Science [XK2020005]
- National Science and Technology Major Project [2019ZX04001024]
- Central Government Guides Local Science and Technology Development Projects of Hubei Province [2018ZYYD016]
- start-up program for excellent young and middle-aged scientific and technological innovation team of Hubei Provincial Department of Education [T201919]
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This study found two threshold speeds for long journal bearing, and pointed out that stability boundary behaves differently when the rotating speed is different from short bearing.
In this study, we observe that there are two threshold speeds (stability threshold speed and second threshold speed) for the long journal bearing, which is different for the short bearing. When the rotating speed is below the stability threshold speed, the stability boundary nearly coincides with the clearance circle, and the journal center gradually returns to the equilibrium point after being released at an initial point. If the rotating speed is between the stability threshold speed and the second threshold speed, after being released at an initial point, the journal center converges to a contour containing the equilibrium point. In this situation, for a higher rotating speed, the corresponding contour is also larger. When the rotating speed exceeds the second threshold speed, the journal gradually moves towards the bearing surface after being released at an initial point.
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