scholarly journals Thermal diagnostics of friction in a sliding bearing system with account taken of shaft rotation

2016 ◽  
Author(s):  
N. P. Starostin ◽  
R. S. Tikhonov
Keyword(s):  
Sliding Bearing ◽  
Shaft Rotation ◽  
Thermal Diagnostics ◽  
Bearing System

Research on a rigid rotor-sliding bearing system with a squeeze film damper

2001 ◽  
Vol 5 (3) ◽  
pp. 224-229 ◽  
Author(s):  
Yong-zhong Lu ◽  
Dao-xun Liao ◽  
Qi-bai Huang
Keyword(s):  
Squeeze Film ◽  
Rigid Rotor ◽  
Sliding Bearing ◽  
Squeeze Film Damper ◽  
Bearing System

DESIGN AND TRIAL OF INTELLIGENT SLIDING BEARING SYSTEM

2008 ◽  
Vol 07 (01) ◽  
pp. 123-126
Author(s):  
YINGXIN YANG ◽  
MIN LIN ◽  
YUCHUN KUANG ◽  
YONG LIU ◽  
DEMING LIU
Keyword(s):  
Early Warning ◽  
Operating Mechanism ◽  
Test Results ◽  
Sliding Bearing ◽  
Basic Operating ◽  
Bearing System

A patented intelligent sliding bearing system of roller cone bit is invented to monitor radial wear and to stop the running of bearing automatically when the wear reaches the predetermined limit so as to prevent the wear-induced cone loss by early warning. In this paper, the basic operating mechanism of new bearing is stated and discussed. A series of tests are conducted to investigate the mechanical features and the reliability of the new bearing system. The performance of the system is proven to be adequate by the test results.

scholarly journals Response Characteristics of Looseness-Rubbing Coupling Fault in Rotor-Sliding Bearing System

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Liu ◽  
Zengyuan Xue ◽  
Lei Jia ◽  
Tuo Shi ◽  
Hui Ma
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Element Model ◽  
Rotor System ◽  
Sliding Bearing ◽  
Oil Film ◽  
Response Characteristics ◽  
The Time Domain ◽  
Coupling Fault ◽  
Bearing System

For the diagnosis of looseness-rubbing coupling fault of rotor-sliding bearing system caused by bolt looseness fault, the mechanical model and finite element model of dual-disc rotor system with looseness-rubbing coupling fault are established based on the nonlinear finite element method, nonlinear oil film force, looseness stiffness model, and Hertz contact theory. With the augmented Lagrange method, contact constraint conditions are dealt with to ensure that the rotary disk and casing contact with each other meeting boundary penetrating depth within the prescribed tolerance range. And then the dynamics characteristics of the health rotor system supported by sliding bearing are studied. Combined with experimental study and simulation analysis, it is found that the looseness-rubbing coupling fault is often characterized by rubbing fault, the lower part of the time-domain fluctuated shape is denser, while the upper part is relatively loose, and multiple nested half ellipse is shown in orbit diagram. Because of the loosing stiffness and rubbing force, the phenomenon of unstable oil film is depressed. The appearance of the first- and second-order oil film oscillation phenomenon is delayed. It could be used as a theoretical basis for diagnosing looseness-rubbing coupling fault of rotor-sliding bearing system.

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.

Optimal Design in Flexible Rotor-Sliding Bearing System With Squeeze Film Damper

2003 ◽  
Author(s):  
Yong-Zhong Lu ◽  
Dao-Xun Liao
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
System Optimization ◽  
System Stability ◽  
Squeeze Film ◽  
Inertia Force ◽  
Flexible Rotor ◽  
Sliding Bearing ◽  
Squeeze Film Damper ◽  
Bearing System

A dynamic model of a flexible rotor-sliding bearing system with squeeze film damper (SFD) is established. In the model are oil film inertia force, damping force, clearance excitation force, interference force of different frequencies and static load considered, as opposed to the previous research. On the basis of this model, then optimal design of the system is deeply studied. Simulation shows that the system optimization design can effectively improve the system stability.

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