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

Non-linear stability analysis of micropolar fluid lubricated journal bearings with turbulent effect

2019 ◽  
Vol 71 (1) ◽  
pp. 31-39
Author(s):  
Subrata Das ◽  
Sisir Kumar Guha
Keyword(s):  
Stability Analysis ◽  
Linear Stability ◽  
Micropolar Fluid ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Turbulent Regime ◽  
Content Type ◽  
Non Linear ◽  
The Stability ◽  
Bearing System

Purpose The purpose of this paper is to investigate the effect of turbulence on the stability characteristics of finite hydrodynamic journal bearing lubricated with micropolar fluid. Design/methodology/approach The non-dimensional transient Reynolds equation has been solved to obtain the non-dimensional pressure field which in turn used to obtain the load carrying capacity of the bearing. The second-order equations of motion applicable for journal bearing system have been solved using fourth-order Runge–Kutta method to obtain the stability characteristics. Findings It has been observed that turbulence has adverse effect on stability and the whirl ratio at laminar flow condition has the lowest value. Practical implications The paper provides the stability characteristics of the finite journal bearing lubricated with micropolar fluid operating in turbulent regime which is very common in practical applications. Originality/value Non-linear stability analysis of micropolar fluid lubricated journal bearing operating in turbulent regime has not been reported in literatures so far. This paper is an effort to address the problem of non-linear stability of journal bearings under micropolar lubrication with turbulent effect. The results obtained provide useful information for designing the journal bearing system for high speed applications.

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.

Stability Analysis of an Industrial Gas Compressor Supported by Tilting-Pad Bearings Under Different Lubrication Regimes

2011 ◽  
Author(s):  
Alejandro Cerda Varela ◽  
Ilmar Ferreira Santos
Keyword(s):  
Stability Analysis ◽  
Dynamic Behavior ◽  
Journal Bearing ◽  
Lubrication Regimes ◽  
Lubrication Regime ◽  
Stable Operating ◽  
Tilting Pad ◽  
The Stability ◽  
Tilting Pad Journal Bearing ◽  
Bearing System

This work is aimed at theoretically study the dynamic behavior of a rotor-tilting pad journal bearing system under different lubrication regimes, namely thermohydrodynamic (THD), elastohydrodynamic (EHD) and hybrid lubrication regime. The rotor modeled corresponds to an industrial compressor. Special emphasis is put on analyzing the stability map of the rotor when the different lubrication regimes are included into the TPJB modeling. Results show that, for the studied rotor, the inclusion of a THD model is more relevant when compared to an EHD model, as it implies a reduction on the instability onset speed for the rotor. Also, results show the feasibility of extending the stable operating range of the rotor by implementing a hybrid lubrication regime.

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

Failure Analysis of the Rotor-Journal Bearing System of Rotary Compressor

2007 ◽  
Author(s):  
Fei Xie ◽  
Bo Huang ◽  
Haifeng Zhang ◽  
Chunhui Liu
Keyword(s):  
Finite Element ◽  
Journal Bearing ◽  
Rotary Compressor ◽  
Variation Principle ◽  
Tension Stress ◽  
Beam Model ◽  
Air Conditioner ◽  
Oil Film ◽  
Rotor Journal ◽  
Bearing System

Rotary compressor has been widely used in room air conditioner. During development of the new compressor, the abrasion of bearings and the break of crankshaft frequently occurred. So it is very important to build a numerical method to estimate the reliability of the compressor. The rotor-journal bearing system is numerically solved as a dynamic nonlinear fluid-structure interaction problem in this paper. The finite element models of the rotor and bearing housings are built up by using the Timoshenko beam model. In order to get the oil film pressure of the journal bearing, Reynolds equation is solved by variation principle, and the finite element method is used to discrete the oil film. An iterative method based on the complimentary principle is used to solve the oil film force and the Reynolds boundary simultaneously. Through analysis, the abrasion position between the bearing and shaft is presented, and the bending tension stress shows the dangerous sections of the crankshaft. Through the distribution of the oil pressure, position of the screw oil groove, which is built on the inside of the bearing housing to supply the oil to lubricate the bearing, is determined. The proper position of the radial oil hole on shaft is decided by analysis of the bending tension stress.

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