scholarly journals Coupling Analysis of Dynamics and Oil Film Lubrication on Rotor - Floating Bush Bearing System

2011 ◽  
Vol 5 (3) ◽  
pp. 461-473 ◽  
Author(s):  
Mizuho INAGAKI ◽  
Atsushi KAWAMOTO ◽  
Takanori ABEKURA ◽  
Atsushi SUZUKI ◽  
Jan RÜBEL ◽  
...  
Keyword(s):  
Coupling Analysis ◽  
Oil Film ◽  
Analysis Of Dynamics ◽  
Bearing System ◽  
Film Lubrication

Study of Hybrid Lubrication at the Tooth Contact of a Wormgear Transmission: Part 1—Formulation and Analysis

1998 ◽  
Vol 120 (1) ◽  
pp. 103-111 ◽  
Author(s):  
Qin Yuan ◽  
D. C. Sun ◽  
D. E. Brewe
Keyword(s):  
Film Flow ◽  
Flow Problem ◽  
Normal Force ◽  
Capillary Tube ◽  
Gear Tooth ◽  
Analytical Form ◽  
Tooth Contact ◽  
Oil Film ◽  
Transmission Part ◽  
Film Lubrication

The paper presents a lubrication analysis for the tooth contact of a proposed wormgear transmission. The information needed for the lubrication analysis has been mostly obtained from a previously published wormgear analysis. The information includes the geometry of the clearance between the meshing surfaces, the velocity of the worm surface relative to the gear surface, and the normal force acting on a gear tooth as it moves through the meshing zone. The lubrication analysis is carried out after a design of the oil supply configuration is made, that consists of a single transverse oil recess and a capillary tube flow restrictor. Under the predetermined normal force, the lubrication analysis is aimed at obtaining the needed supply pressure to separate the meshing surfaces by a minimum oil film thickness, which is prescribed to insure the establishment of fluid film lubrication at the contact. The lubrication analysis considers (1) the hybrid lubrication effect (combined hydrostatic action and hydrodynamic wedge and squeeze actions), (2) the temperature rise in the oil film flow and the restrictor flow, and (3) the pressure and temperature dependence of oil properties. Part I describes the formulation of the oil film flow problem (in discrete form) and the restrictor flow problem (in analytical form). The two problems are coupled through the conditions of flow continuity and energy balance in the oil recess.

scholarly journals Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions

2016 ◽  
Vol 8 (2) ◽  
pp. 22
Author(s):  
Jingyuan Li ◽  
Zifeng Li
Keyword(s):  
Bearing Capacity ◽  
Rotation Speed ◽  
Rotating Shaft ◽  
Sliding Bearing ◽  
Load Bearing ◽  
Sleeve Bearing ◽  
Oil Film ◽  
Neck Rotation ◽  
Rotating Load ◽  
Film Lubrication

<p class="1Body">The theory of lubrication of a radial sliding bearing is extended to three cases: the shaft neck rotation and bush rotation bearing, the rotating load bearing, and the floating sleeve bearing. For the bearing with rotating shaft neck and rotating bush, fixing the observer at the bushing can enable the determination, in a simple and more accurate manner, of the bearing capacity of the bearing with the rotating load. As long as a rotating load exists, whirl exists; if the shaft rotation speed is 2 times the load rotation speed, then the eccentricity reaches the maximum.</p>

A study on the influence of oil film lubrication to the strength of engine connecting rod components

2016 ◽  
Vol 63 ◽  
pp. 94-105 ◽  
Author(s):  
Jun-chao Zhu ◽  
Han-hua Zhu ◽  
Shi-dong Fan ◽  
Liang-jun Xue ◽  
You-feng Li
Keyword(s):  
Connecting Rod ◽  
Oil Film ◽  
Film Lubrication

Modelling and Analysis of the Dynamic Behavior of an Active Journal Bearing

1994 ◽  
Author(s):  
Linxiang Sun ◽  
Janusz M. Krodkiewski ◽  
Nong Zhang
Keyword(s):  
Pressure Distribution ◽  
Reynolds Equation ◽  
Hydrodynamic Pressure ◽  
Chamber Pressure ◽  
Oil Film ◽  
Simulation Based ◽  
Rotor Bearing ◽  
New Type ◽  
The Stability ◽  
Bearing System

Modelling and analysis of a rotor-bearing system with a new type of active oil bearing are presented. The active bearing basically consists of a flexible sleeve and a pressure chamber. The deformation of the sleeve can be controlled by the chamber pressure during the operation, and so can the pressure distribution of the oil film. Finite Element Methods (FEMs) and the Guyan condensation technique were utilised to create mathematical models for both the rotor and the flexible sleeve. The hydrodynamic pressure distribution of the oil film, for the instantaneous positions and velocities of the flexible sleeve and rotor, was approximated by Reynolds equation. The influence of the chamber pressure on the stability of the rotor system was investigated by numerical simulation based on the nonlinear model. The results showed that the stability of the rotor-bearing system can be improved effectively by implementation of the active bearing.

Non-linear dynamic behaviour of rotor—bearing system trained by bevel gears

2008 ◽  
Vol 222 (4) ◽  
pp. 617-627 ◽  
Author(s):  
M Li
Keyword(s):  
Equilibrium Points ◽  
Rotor System ◽  
Design Stage ◽  
Oil Film ◽  
Bevel Gears ◽  
Linear Dynamic ◽  
Non Linear ◽  
Rotor Bearing ◽  
Stability And Bifurcations ◽  
Bearing System

The vibrations of parallel geared rotor—bearing system have been intensively discussed; however, little attention has been paid to the dynamic analysis of angled bevel-geared system supported on journals. In the present work, the non-linear dynamics of a bevel-geared rotor system on oil film bearings is studied. First, the dynamic model is developed under some assumptions, such as rigid rotors, short-bearings, small teeth errors, and so forth. Then, the non-linear dynamic behaviours of both the balanced and unbalanced rotor system are analysed, respectively, in which the equilibrium points, limit cycles, their stability, and bifurcations are paid more attention. Numerical results show that in the bevel-geared rotor system under the action of non-linear oil film forces there exists a series of complex non-linear dynamic phenomena of rotor orbits, such as Hopf bifurcation, torus-doubling bifurcation, and jump phenomenon. All these features can help us to understand the dynamic characteristics of bevel-geared rotor—bearing system at design stage and during running period. Finally, some concerned problems during the investigation are also present.

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