Dynamic Characteristics of Finite Porous Journal Bearings Considering Tangential Velocity Slip

1984 ◽  
Vol 106 (4) ◽  
pp. 534-536 ◽  
Author(s):  
A. K. Chattopadhyay ◽  
B. C. Majumdar
Keyword(s):  
Theoretical Investigation ◽  
Finite Length ◽  
Dynamic Characteristics ◽  
Tangential Velocity ◽  
Velocity Slip ◽  
Journal Bearings ◽  
Film Interface

A theoretical investigation to find out the dynamic characteristics of porous journal bearings of finite length has been carried out considering the Beavers-Joseph crierion of velocity slip at the bearing film interface. It has been shown that the effect of velocity slip on the dynamic characteristics is small.

Stability of a Rigid Rotor in Finite Externally Pressurized Oil Journal Bearings With Slip

1987 ◽  
Vol 109 (2) ◽  
pp. 301-306 ◽  
Author(s):  
Ajit Kumar Chattopadhyay ◽  
B. C. Majumdar ◽  
N. S. Rao
Keyword(s):  
Theoretical Analysis ◽  
Finite Length ◽  
Tangential Velocity ◽  
Velocity Slip ◽  
Journal Bearings ◽  
Rigid Rotor ◽  
The Stability ◽  
Film Interface

A theoretical analysis has been carried out to determine the stability characteristics of externally pressurized porous oil journal bearings of finite length considering the tangential velocity slip at the bearing-film interface. The stability curves have been drawn for different slip parameters, eccentricity ratios, slenderness ratios, bearing speed parameters etc.

Study of Conical Whirl Instability of Self-Acting Porous Gas Journal Bearings Considering Tangential Velocity Slip

1988 ◽  
Vol 110 (1) ◽  
pp. 139-143
Author(s):  
S. K. Guha ◽  
N. S. Rao ◽  
B. C. Majumdar
Keyword(s):  
Tangential Velocity ◽  
Hydrodynamic Pressure ◽  
Velocity Slip ◽  
Journal Bearings ◽  
Stability Characteristic ◽  
Damping Coefficients ◽  
Conical Whirl ◽  
Angular Displacements ◽  
Stiffness And Damping ◽  
Film Interface

The purpose of the present work is to study theoretically the conical whirl instability of unloaded self-acting porous gas journal bearings considering the tangential velocity slip at the bearing-film interface. The hydrodynamic pressure developed in the bearing clearance due to angular displacements of the journal at the midplane of the bearing is obtained by the simultaneous solution of equation of continuity in the porous medium and the modified Reynolds equations, satisfying the appropriate boundary conditions. With the help of the dynamic tilting stiffness and damping coefficients, stability characteristic is obtained. The effects of various parameters on conical stability parameter have been investigated for a nongyroscopic system.

Study of Conical Whirl Instability of Externally Pressurized Porous Oil Journal Bearings With Tangential Velocity Slip

1986 ◽  
Vol 108 (2) ◽  
pp. 256-261 ◽  
Author(s):  
S. K. Guha
Keyword(s):  
Tangential Velocity ◽  
Velocity Slip ◽  
Journal Bearings ◽  
Conical Whirl ◽  
Film Interface

In the present paper, an attempt has been made to study theoretically the conical whirl instability of unloaded hydrostatic porous oil journal bearings with tangential velocity slip on the bearing film interface. The effect of various parameters on stability has also been investigated.

On the linear stability analysis of finite-hydrodynamic porous journal bearings under coupled stress lubrication

2007 ◽  
Vol 221 (7) ◽  
pp. 831-840 ◽  
Author(s):  
S. K. Guha ◽  
A. K. Chattopadhyay
Keyword(s):  
Reynolds Equation ◽  
Dynamic Performance ◽  
Slip Flow ◽  
Tangential Velocity ◽  
Continuum Theory ◽  
Transient State ◽  
Velocity Slip ◽  
Journal Bearings ◽  
The Stability ◽  
Coupled Stress

The objective of the present investigation is to study theoretically, using the finite-difference techniques, the dynamic performance characteristics of finite-hydrodynamic porous journal bearings lubricated with coupled stress fluids. In the analysis based on the Stokes micro-continuum theory of the rheological effects of coupled stress fluids, a modified form of Reynolds equation governing the transient-state hydrodynamic film pressures in porous journal bearings with the effect of slip flow of coupled stress fluid as lubricant is obtained. Moreover, the tangential velocity slip at the surface of porous bush has been considered by using Beavers-Joseph criterion. Using the first-order perturbation of the modified Reynolds equation, the stability characteristics in terms of threshold stability parameter and whirl ratios are obtained for various parameters viz. permeability factor, slip coefficient, bearing feeding parameter, and eccentricity ratio. The results show that the coupled stress fluid exhibits better stability in comparison with Newtonian fluid.

Analysis of a Centrally Loaded 120 Degree Partial Porous Journal Bearing Taking Tangential Velocity Slip into Account

1981 ◽  
Vol 23 (4) ◽  
pp. 171-178 ◽  
Author(s):  
M. Malik ◽  
M. Chandra ◽  
R. Sinhasan
Keyword(s):  
Porous Medium ◽  
Aspect Ratio ◽  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Tangential Velocity ◽  
Velocity Slip ◽  
Fluid Film ◽  
Static And Dynamic Characteristics ◽  
Wide Range ◽  
Permeability Parameter

This paper presents the analysis of a partial porous journal bearing for its static and dynamic characteristics. Tangential velocity slip at the interface of the fluid film and the porous medium has been taken into account. The analysis is general and can be easily adapted to plane journal and non-circular bearing configurations. The results reported in the paper are for centrally loaded 120 degree partial bearings of aspect ratio equal to unity. These results include static as well as dynamic characteristics of the bearing. A wide range of permeability parameter and R/C ratio has been covered making the data quite comprehensive for design purposes.

Stability of Jeffcott Rotor Operating in Tilting 3-Pad Journal Bearings with Turbulent Oil Film

2009 ◽  
Vol 147-149 ◽  
pp. 450-455
Author(s):  
Stanislaw Strzelecki ◽  
Sobhy M. Ghoneam
Keyword(s):  
Theoretical Investigation ◽  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Oil Film ◽  
Temperature Distributions ◽  
Jeffcott Rotor ◽  
Oil Flow ◽  
The Stability ◽  
Oil Film Pressure

This paper introduces the results of theoretical investigation on the dynamic characteristics of tilting 3-pad journal bearing that operates with turbulent oil film. The Reynolds, energy, viscosity and geometry equations determine the oil film pressure, temperature distributions, and oil film resultant force that are the grounds for the dynamic characteristics of bearing. These equations were solved simultaneously on the assumption of adiabatic laminar or adiabatic turbulent oil flow in the bearing gap. The stability and system damping of Jeffcott rotor operating in tilting 3-pad journal bearing was determined.

On the Stability of a Rigid Rotor in Finite Porous Journal Bearings With Slip

1986 ◽  
Vol 108 (2) ◽  
pp. 190-194 ◽  
Author(s):  
Ajit Kumar Chattopadhyay ◽  
B. C. Majumdar
Keyword(s):  
Experimental Data ◽  
Finite Length ◽  
Velocity Slip ◽  
Journal Bearings ◽  
Rigid Rotor ◽  
The Stability ◽  
Theoretical Results

This investigation deals with the stability characteristics of oil filled porous journal bearings of finite length and with velocity slip. The stability curves are drawn for different slip parameters, eccentricity ratios, slenderness ratios, and in the absence of any experimental data, the theoretical results for the solid bearings obtained by this analysis have been compared with the available results of solid bearing.

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