An EHD Model to Predict the Interdependent Behavior of Two Dynamically Loaded Hybrid Journal Bearings

2005 ◽  
Vol 127 (2) ◽  
pp. 416-424 ◽  
Author(s):  
Aurelian Fatu ◽  
Mohamed Hajjam ◽  
Dominique Bonneau
Keyword(s):  
Elastic Deformation ◽  
Iterative Solution ◽  
Solution Procedure ◽  
Journal Bearings ◽  
Accurate Analysis ◽  
Element Discretization ◽  
Lubricant Flow ◽  
Two Hybrid ◽  
Shaft Surface ◽  
Iterative Solution Procedure

An elastohydrodynamic (EHD) analysis is performed for two misaligned hybrid journal bearings working on the same shaft. To predict the correct system behavior we are forced to consider the interdependence between the two bearings and the shaft. The presented algorithm is based on finite element discretization. It allows accurate analysis of film breakdown and reforming, during the functioning of actual devices. Active (full film) and inactive (cavitated) film zones are determined for nonstationary running conditions. Using a convenient iterative solution procedure, the converged solutions for lubricant flow and elastic deformation fields are obtained. The analysis of thickness, pressure, power loss, and elastic deformation of both bearings and shaft surface allows the optimization of any parameter for the two hybrid bearings.

Analysis of non-Newtonian and piezoviscous effects in dynamically loaded connecting-rod bearings

2005 ◽  
Vol 219 (3) ◽  
pp. 209-224 ◽  
Author(s):  
A Fatu ◽  
M Hajjam ◽  
D Bonneau
Keyword(s):  
Three Dimensional ◽  
Iterative Solution ◽  
Solution Procedure ◽  
Elastic Behaviour ◽  
Connecting Rod ◽  
Film Rupture ◽  
Accurate Analysis ◽  
Element Discretization ◽  
Actual Operation ◽  
Present Algorithm

The dynamic behaviour of three elastic connecting-rod big-end bearings is studied. Non-Newtonian and piezoviscous behaviour of the lubricant is included. The present algorithm allows accurate analysis of film rupture and reformation during actual operation of an engine and is based on finite element discretization. The non-Newtonian effect is introduced by modifying the viscosity for each point of a three-dimensional mesh of the film and for each iteration. Using a convenient iterative solution procedure, converged solutions for lubricant flow and elastic deformation fields are obtained. The present algorithm is extended to a global thermo-elastohydrodynamic model, to take into account the effects of viscosity variation with temperature. It is shown that the non-Newtonian shear-thinning and oil piezoviscous effects cannot be neglected in a complete connecting-rod bearing analysis. Furthermore, thermo-elastic behaviour can lead to different conclusions, than obtained by the elastohydrodynamic model.

scholarly journals Self-updated four-node finite element using deep learning

2021 ◽  
Author(s):  
Jaeho Jung ◽  
Hyungmin Jun ◽  
Phill-Seung Lee
Keyword(s):  
Finite Element ◽  
Deep Learning ◽  
Iterative Solution ◽  
Solution Procedure ◽  
Element Formulation ◽  
Zero Energy ◽  
Energy Mode ◽  
Bending Modes ◽  
Solution Accuracy ◽  
Iterative Solution Procedure

AbstractThis paper introduces a new concept called self-updated finite element (SUFE). The finite element (FE) is activated through an iterative procedure to improve the solution accuracy without mesh refinement. A mode-based finite element formulation is devised for a four-node finite element and the assumed modal strain is employed for bending modes. A search procedure for optimal bending directions is implemented through deep learning for a given element deformation to minimize shear locking. The proposed element is called a self-updated four-node finite element, for which an iterative solution procedure is developed. The element passes the patch and zero-energy mode tests. As the number of iterations increases, the finite element solutions become more and more accurate, resulting in significantly accurate solutions with a few iterations. The SUFE concept is very effective, especially when the meshes are coarse and severely distorted. Its excellent performance is demonstrated through various numerical examples.

An Approximate Solution to Radiative Transfer in Two-Dimensional Rectangular Enclosures

1997 ◽  
Vol 119 (4) ◽  
pp. 738-745 ◽  
Author(s):  
J. B. Pessoa-Filho ◽  
S. T. Thynell
Keyword(s):  
Radiative Transfer ◽  
Iterative Solution ◽  
Anisotropic Scattering ◽  
Solution Procedure ◽  
Two Dimensional ◽  
Scattering Media ◽  
Discontinuous Nature ◽  
Selection Of ◽  
Iterative Solution Procedure ◽  
Numerical Approaches

The application of a new approximate technique for treating radiative transfer in absorbing, emitting, anisotropically scattering media in two-dimensional rectangular enclosures is presented. In its development the discontinuous nature of the radiation intensity, stability of the iterative solution procedure, and selection of quadrature points have been addressed. As a result, false scattering is eliminated. The spatial discretization can be formed without considering the chosen discrete directions, permitting a complete compatibility with the discretization of the conservation equations of mass, momentum, and energy. The effects of anisotropic scattering, wall emission, and gray-diffuse surfaces are considered for comparison with results available in the literature. The computed numerical results are in excellent agreement with those obtained by other numerical approaches.

Computationally Convenient State Variables for Bond Graph Two-Phase Accumulators

1983 ◽  
Vol 105 (3) ◽  
pp. 202-204 ◽  
Author(s):  
J. Louis Tylee
Keyword(s):  
Iterative Solution ◽  
Bond Graph ◽  
Solution Procedure ◽  
State Variables ◽  
Two Phase ◽  
Fluid Mass ◽  
Iterative Solution Procedure ◽  
Total Fluid

New state variables for the bond graph two-phase accumulator are proposed. The usual accumulator states, total fluid mass and total fluid energy, require an iterative solution procedure to obtain accumulator pressure. The newly proposed states, fluid quality and pressure, eliminate these iterations.

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