Analytical Curve Fits for Solution Parameters of Dynamically Loaded Journal Bearings

1984 ◽  
Vol 106 (4) ◽  
pp. 421-427 ◽  
Author(s):  
P. K. Goenka
Keyword(s):  
Journal Bearing ◽  
Journal Bearings ◽  
Solution Time ◽  
Pressure Curve ◽  
Element Analysis ◽  
Analytical Curve ◽  
Dynamically Loaded ◽  
Method Of Solution ◽  
Mobility Method ◽  
Solution Accuracy

The mobility method of solution is frequently used for analyzing dynamically loaded journal bearings. Curve fits of journal-bearing solutions are used in this method. All the currently available curve fits are lacking in one or more of three important features—the solution accuracy, the solution detail, and the solution time. A new set of analytical curve fits is presented in this paper. The set includes: the two components of mobility vectors, location and magnitude of maximum film pressure, and the starting and finishing angles of the pressure curve. For an ideal journal bearing, the new curve fits give accuracy and solution detail comparable to an expensive finite-element analysis, while keeping the solution time comparable to that required for the short-bearing approximation. An example is presented to demonstrate the use of the new curve fits.

Rapid and globally convergent method for dynamically loaded journal bearing design

1998 ◽  
Vol 212 (3) ◽  
pp. 207-214 ◽  
Author(s):  
H Hirani ◽  
K Athre ◽  
S Biswas
Keyword(s):  
Journal Bearing ◽  
Pressure Curve ◽  
Algebraic Equations ◽  
Connecting Rod ◽  
Main Bearing ◽  
Element Analysis ◽  
Globally Convergent ◽  
Dynamically Loaded ◽  
Convergent Method ◽  
Bearing Design

An approximate analytical pressure expression for dynamically loaded journal bearings is proposed. This approximation is applied to the solution of the finite journal bearing with a π-extent film. The starting and ending angular positions of the pressure curve are predicted by simple algebraic equations. The journal orbit is determined by treating it as an ‘inverse problem’ and evaluated by using the globally convergent Newton-Raphson method. To illustrate the validity of the present study, the Ruston and Hornsby big-end connecting rod bearing and an engine main bearing are analysed. The accuracy of the minimum film thickness and maximum film pressure values obtained by the proposed methodology is comparable to the more elaborate and time consuming finite element analysis, while the execution time is comparable to that required for the short bearing approximation.

Dynamically Loaded Journal Bearings: Mobility Method of Solution

1965 ◽  
Vol 87 (3) ◽  
pp. 537-546 ◽  
Author(s):  
J. F. Booker
Keyword(s):  
Numerical Solutions ◽  
Journal Bearings ◽  
Dynamically Loaded ◽  
Method Of Solution ◽  
Mobility Method

An approach is presented for simplified analytical, graphical, and numerical solutions to extremely general problems of dynamically loaded bearings. A series of examples illustrates the application of the method to problems of varying complexity.

Oscillating Journal Bearings Under Steady Load: A Numerical Study of Limiting Cases

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
S. Boedo ◽  
D. P. Anderson
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Journal Bearing ◽  
Numerical Study ◽  
Substantial Improvement ◽  
Journal Bearings ◽  
Method Of Solution ◽  
Mobility Method ◽  
Zero Offset ◽  
Steady Load

This note provides a more extensive assessment of bearing performance for steadily loaded oscillating journal bearings using the mobility method of solution. Even with significantly large journal oscillation amplitudes, unexpectedly thin films are predicted for conventional designs as the load number goes to zero. Offset journal bearing arrangements subjected to the same loads and kinematics are shown to provide a substantial improvement in film thickness, particularly at low oscillation amplitudes, compared with the conventional design configuration.

Dynamically Loaded Pivoted Pad Journal Bearings: Mobility Method of Solution

1976 ◽  
Vol 98 (2) ◽  
pp. 196-204 ◽  
Author(s):  
W. E. ten Napel ◽  
H. Moes ◽  
R. Bosma
Keyword(s):  
Reasonable Agreement ◽  
Journal Bearings ◽  
Numerical Results ◽  
Radial Bearing ◽  
Dynamically Loaded ◽  
Method Of Solution ◽  
Mobility Method ◽  
Angle Method

The mobility-whirl angle method as introduced by Booker in 1964, has been applied to pivoted pad journal bearings to predict the behavior of a rotor supported in this type of bearing. Both the single pivoted pad and the complete radial bearing with three equally spaced radial pads have been analyzed. It will be shown that the method is restricted to the case where the value of the load on each pad has to be known from the start. Some experiments have been carried out on a squeeze apparatus. The results are in reasonable agreement with numerical results.

An Evaluation of Eight-Node Quadrilateral Finite Elements for the Analysis of a Dynamically Loaded Hydrodynamic Journal Bearing

1988 ◽  
Vol 202 (2) ◽  
pp. 95-101 ◽  
Author(s):  
J D C McIvor ◽  
D N Fenner
Keyword(s):  
Finite Element Analysis ◽  
Journal Bearing ◽  
Computer Time ◽  
Medium Size ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dynamically Loaded ◽  
Hydrodynamic Journal Bearing ◽  
Triangular Elements ◽  
Solution Accuracy

A comparative study is presented for the finite element analysis of a dynamically loaded journal bearing showing the improvement in solution accuracy and decrease in computer time achieved when using eight-node quadilateral, rather than three-node triangular, elements. Results are presented for medium size diesel engine big end bearings using a wide variety of mesh gradings.

scholarly journals Mobility Method Applied to Calculate the Lubrication Properties of Bearing under Dynamic Loads

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Tao He ◽  
Xiqun Lu ◽  
Jingzhi Zhu
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Systems ◽  
Journal Bearings ◽  
Numerical Results ◽  
Dynamic Loads ◽  
Analysis Program ◽  
Computational Program ◽  
Dynamically Loaded ◽  
Mobility Method ◽  
Lubrication Properties

The analytical mobility method for dynamically loaded journal bearings was presented, with the intent to include it in a general computational program, such as the dynamic analysis program, that has been developed for the dynamic analysis of general mechanical systems. An illustrative example and numerical results were presented, with the efficiency of the method being discussed in the process of their presentation.

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