scholarly journals Dynamic Analysis of a Rotor-Journal Bearing System with Large Dynamic Loads. Stiffness and Damping Coeffcient Variation in Bearing Oil Films.

1991 ◽  
Vol 57 (543) ◽  
pp. 3606-3611
Author(s):  
Hitoshi HATTORI
Keyword(s):  
Dynamic Analysis ◽  
Journal Bearing ◽  
Dynamic Loads ◽  
Rotor Journal ◽  
Stiffness And Damping ◽  
Oil Films ◽  
Bearing System

Numerical and Experimental Research on Periodic Solution Stability of Inclined Rotor Journal Bearing System

2011 ◽  
Author(s):  
Dashuai Qian ◽  
Zhansheng Liu ◽  
Jiajia Yan ◽  
Liquan Sun ◽  
Yongliang Wang
Keyword(s):  
Periodic Solution ◽  
Journal Bearing ◽  
Rotor System ◽  
Experimental Results ◽  
System Stability ◽  
Response Analysis ◽  
Solution Stability ◽  
Special Cases ◽  
Rotor Journal ◽  
Bearing System

Rotor bearing systems on ships usually work in inclined states when ships are swaying in wave and wind. The inclined status will affect the lubricant condition of journal bearing and bring about changes of the dynamic characteristics of the rotor system. To study the periodic solution stability of inclined rotor journal bearing system, Capone’s short bearing model is employed to describe the journal bearing support properties. Considering the inclination induced change of bearing radial load, the dynamic equation of inclined rotor system is established by using finite element method. The periodic solution stability is discussed based on bifurcation and response analysis. With the increase of rotating speed, instability of period-1 motion happens and oil whirl occurs. The motion then develops into a kind of quasi-periodic motion. Two special cases of inclined rotor system, the horizontal and the vertical cases, are compared and discussed. Both of the numerical and the experimental results show that the periodic solution unstable threshold decreases with the increase of rotor inclination angle. At last, some experimental results about influences of experiments conditions on rotor system stability are given.

Development of Herringbon-Grooved Aerodynamic Journal Bearing Systems for Ultra-High-Speed Rotations

2015 ◽  
Vol 656-657 ◽  
pp. 652-657 ◽  
Author(s):  
Norifumi Miyanaga ◽  
Jun Tomioka
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Journal Bearing ◽  
Damping Properties ◽  
Shaft Rotation ◽  
Ultra High Speed ◽  
The Difference ◽  
The Stability ◽  
Stiffness And Damping ◽  
Bearing System

It is absolutely important for ultra-compact rotational machineries to achieve sable shaft rotation at ultra-high-speed. This paper discussed herringbone-grooved aerodynamic journal bearing systems developed for the purpose. In this system, the bearings are supported by rubber-O-rings for accurate and stable operations. To grasp the possibility for stabilization, two types of O-rings with different stiffness and damping properties under bearing supporting were tested in the experiment. As the results, the bearing system demonstrated the maximum rotational speed over 460,000 rpm without unstable phenomenon called whirl. However, the difference in rubber O-rings definitely affected the stability of the bearing system.

Identification of clearances and stability analysis for a rotor-journal bearing system

2008 ◽  
Vol 43 (4) ◽  
pp. 411-426 ◽  
Author(s):  
Chris A. Papadopoulos ◽  
Pantelis G. Nikolakopoulos ◽  
George D. Gounaris
Keyword(s):  
Stability Analysis ◽  
Journal Bearing ◽  
Rotor Journal ◽  
Bearing System

scholarly journals Simulation of oil whirl for geared rotor journal bearing system

2018 ◽  
Vol 1074 ◽  
pp. 012045
Author(s):  
Zhenxing Liu ◽  
Yanming Wei ◽  
Lei Chen ◽  
Zhansheng Liu ◽  
Xianghe Wang
Keyword(s):  
Journal Bearing ◽  
Oil Whirl ◽  
Rotor Journal ◽  
Bearing System
Sign in / Sign up

Export Citation Format

Share Document