scholarly journals Dynamic analysis of a rotor-journal bearing system with large dynamic loads. Influence of relative misalignment between the bearings on the characteristics of a rigid rotor system.

1990 ◽  
Vol 56 (530) ◽  
pp. 2684-2691
Author(s):  
Hitoshi HATTORI ◽  
Noritsugu KAWASHIMA
Keyword(s):  
Dynamic Analysis ◽  
Journal Bearing ◽  
Rotor System ◽  
Dynamic Loads ◽  
Rigid Rotor ◽  
Rotor Journal ◽  
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.

scholarly journals Nonlinear Dynamics Analysis of Tilting Pad Journal Bearing-Rotor System

2011 ◽  
Vol 18 (1-2) ◽  
pp. 45-52 ◽  
Author(s):  
Jiayang Ying ◽  
Yinghou Jiao ◽  
Zhaobo Chen
Keyword(s):  
Nonlinear Dynamics ◽  
System Dynamics ◽  
Journal Bearing ◽  
Rotor System ◽  
Moment Of Inertia ◽  
Dynamics Analysis ◽  
Tilting Pad ◽  
Rotor Bearing ◽  
Tilting Pad Journal Bearing ◽  
Bearing System

The nonlinear dynamics theory is increasingly applied in the dynamics analysis of tilting pad journal bearing-rotor system. However, extensive work on system dynamics done previously neglects the influence caused by the moment of inertia of the pad. In this paper, a comparison is made between the responses of the rotor in the bearings with and without pad inertia effect. Taking the Jeffcott rotor system as an example, the characteristics of bearing-rotor system, such as bifurcation diagram, cycle response, frequency spectrum, phase trajectories, and Poincaré maps, were attained within a certain rotation rate range. The pivotal oil-film force of tilting pad journal bearing was calculated by database method. The results directly demonstrate that considering the influence of the pad moment of inertia, system dynamics characteristics are found more complicated when rotor-bearing system works around natural frequency and system bifurcation is observed forward when rotor-bearing system works on high-speed range.

On the Dynamic Analysis of a Rigid Rotor-Gear Pair-Hydrodynamic Bearing System

1989 ◽  
Vol 111 (3) ◽  
pp. 234-240 ◽  
Author(s):  
B. Kishor ◽  
S. K. Gupta
Keyword(s):  
Mathematical Model ◽  
Dynamic Analysis ◽  
Static Load ◽  
Gear Tooth ◽  
Gear Pair ◽  
Rigid Rotor ◽  
Hydrodynamic Bearing ◽  
Bearing Loads ◽  
The Given ◽  
Bearing System

This paper is an attempt to provide a dynamic analysis of a rigid rotor-gear pair-hydrodynamic bearing system with journal motions in the oil film space of the bearings. A mathematical model has been developed considering the kinematics of the gear pair as affected by journal motions and using a concept of an instantaneous line of action. Effects of bearing parameters on dynamic tooth loads have been studied. The load-speed environment of hydrodynamic bearings supporting the geared rotors is shown to be affected by journal motions in bearings. Results indicate that, for the given gear pair and the given static load-speed conditions, dynamic increments in gear tooth loads and bearing loads vary with bearing parameters (viz. clearances and oil viscosities).

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