Computational efficiency improvement of dimple textured hydrodynamic journal bearing using progressive mesh densification method

2021 ◽  
pp. 1-38
Author(s):  
Nayab Rasool Syed ◽  
Sashindra Kumar Kakoty
Keyword(s):  
Numerical Solution ◽  
Computational Efficiency ◽  
Journal Bearing ◽  
Elastohydrodynamic Lubrication ◽  
Efficiency Improvement ◽  
Performance Parameters ◽  
Hydrodynamic Bearings ◽  
Progressive Mesh ◽  
Hydrodynamic Journal Bearing

Abstract There is a considerable amount of study carried out on textured hydrodynamic bearings. The numerical solution of textured bearings is a matter of concern for the researchers. There are several methods used to estimate the performance parameters of textured bearings. However, Progressive Mesh Densification (PMD) method is not yet used for textured bearings while it has been used for mixed elastohydrodynamic lubrication (EHL) and thermo-elastohydrodynamic lubrication (EHL) problems. In the present analysis, the PMD method is implemented to estimate the performance parameters of the textured journal bearing. It is compared with the multigrid and the fixed mesh methods and found to be very effective in improving computational efficiency.

Investigation the combined effects of wear and turbulent on the performance of hydrodynamic journal bearing operating with couple stress fluids

2019 ◽  
Vol 10 (6) ◽  
pp. 825-837
Author(s):  
Mushrek A. Mahdi ◽  
Ahmed Waleed Hussein
Keyword(s):  
Couple Stress ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Performance Characteristics ◽  
Turbulent Regime ◽  
Hydrodynamic Bearings ◽  
Content Type ◽  
Hydrodynamic Journal Bearing ◽  
Local Reynolds Number ◽  
Couple Stress Fluids

Purpose The purpose of this paper is to investigate the combined effect of wear and turbulence on the performance of a hydrodynamic journal bearing operating under Newtonian and couple stress fluids (CSF). Design/methodology/approach The analysis consists of a modified Reynolds equation of incompressible thin viscous films, and the film thickness model taking into account the wear effect. The governing equation was solved numerically using the finite difference approach. Findings The effect of both the wear parameter and the local Reynolds number on the performance characteristics of bearing has been presented and discussed. The obtained results observed that the characteristics of the intact and worn bearing in turbulent and laminar have been enhanced due to the non-Newtonian fluid (CSF) effect. Also, the results display that bearing worn and the turbulent regime cannot be neglected in calculating the performance characteristics of the bearing lubricated with Newtonian and non-Newtonian fluids. The results achieved from this study, specify that the bearing characteristics are significantly affected by these effects. Originality/value The paper investigates the behavior of hydrodynamic bearings considering different aspects simultaneously is interesting, and the application meets the current needs of improvement in modeling hydrodynamic bearings under different conditions.

scholarly journals Performance of Hydrodynamic Journal Bearing Operating under Transient Wear

2020 ◽  
Vol 22 (1) ◽  
pp. 153-170 ◽  
Author(s):  
Sanjay Sharma ◽  
Rajeev Kumar Awasthi
Keyword(s):  
Theoretical Study ◽  
Journal Bearing ◽  
Positive Pressure ◽  
Wear Depth ◽  
Performance Parameters ◽  
Motion Trajectories ◽  
Non Linear Equation ◽  
Bearing Life ◽  
Non Linear ◽  
Hydrodynamic Journal Bearing

AbstractThe paper deals with a theoretical study concerning the effect of transient wear on the performance of hydrodynamic journal bearing. The eccentricity ratios are considered 0.3, 0.6 and for varying wear depth from 0.1 to 0.5 for the analysis of purpose. The Reynolds equations governing the flow of lubricant in the clearance space of a hydrodynamic journal bearing system with varying wear depth has been numerically solved using Galerkin’s FEM. The regime is assumed to be isothermal. The positive pressure zone is established using Reynolds boundary condition through iteratively. The various performance parameters which include static, dynamic and stability terms of worn journal bearing are presented with respect to relative wear depth. The journal centre motion trajectories are also obtained by numerically integrated linear and non-linear equation of motion using fourth order Runga-Kutta method. For this a computer program in Mat lab was developed based on analysis to draw the linear and non linear motion trajectories and in order to validate the developed program, the numerically simulated results computed from the present study are compared with the already published results in literature. For analysis purpose the initial values of velocities and displacement are taken as {\bar {\dot X}}\, = \,{\bar {\dot Z}}\, = \,0.0 and {\bar x} and {\bar z}\, = \,0.005 . The results help in predicting bearing life for smooth operation.

Progressive Mesh Densification Method for Numerical Solution of Mixed Elastohydrodynamic Lubrication

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Wei Pu ◽  
Jiaxu Wang ◽  
Dong Zhu
Keyword(s):  
Surface Roughness ◽  
Numerical Solution ◽  
Numerical Solutions ◽  
Initial Conditions ◽  
Solution Process ◽  
Elastohydrodynamic Lubrication ◽  
Operating Conditions ◽  
Machined Surface ◽  
Progressive Mesh ◽  
Wide Range

Numerical solution of mixed elastohydrodynamic lubrication (EHL) is of great importance for the study of lubrication formation and breakdown, as well as surface failures of mechanical components. However, converged and accurate numerical solutions become more difficult, and solution process with a fixed single discretization mesh for the solution domain appears to be quite slow, especially when the lubricant films and surface contacts coexist with real-machined roughness involved. Also, the effect of computational mesh density is found to be more significant if the average film thickness is small. In the present study, a set of sample cases with and without machined surface roughness are analyzed through the progressive mesh densification (PMD) method, and the obtained results are compared with those from the direct iteration method with a single fixed mesh. Besides, more numerical analyses with and without surface roughness in a wide range of operating conditions are conducted to investigate the influence of different compound modes in order to optimize the PMD procedure. In addition, different initial conditions are used to study the effect of initial value on the behaviors of this transient solution. It is observed that, no matter with or without surface roughness considered, the PMD method is stable for transient mixed EHL problems and capable of significantly accelerating the EHL solution process while ensuring numerical accuracy.

Influence of texture geometries on the performance parameters of hydrodynamic journal bearing

2021 ◽  
pp. 135065012098269
Author(s):  
Niranjan Singh ◽  
Rajeev Kumar Awasthi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aspect Ratio ◽  
Journal Bearing ◽  
Geometric Parameters ◽  
Performance Parameters ◽  
Surface Textures ◽  
Stability Performance ◽  
Hydrodynamic Journal Bearing ◽  
Bearing System

The operating and geometric parameters of textures affect the static, dynamic, and stability performance characteristics of a journal-bearing system. The present work investigates the influence of spherical-, cylindrical-, triangular-, and kite-shaped textures on the performance parameters of a journal-bearing system. The flow of a lubricant is assumed to be Newtonian and iso-viscous. Reynold's equation governing the flow of a lubricant between the space in the bearing and the journal is solved by a finite-element method. The computed results indicate that the spherically textured journal bearing provides better improvement in the performance parameters vis-a-vis other textured bearings. In general, the effect of texture shapes is more pronounced at the aspect ratio of surface textures is 1.0.

Static and dynamic analysis of hydrodynamic journal bearing operating under nano lubricants

2009 ◽  
Vol 2 (1/2/3/4/5/6) ◽  
pp. 251 ◽  
Author(s):  
K. Prabhakaran Nair ◽  
Mohammed Shabbir Ahmed ◽  
Saed Thamer Al qahtani
Keyword(s):  
Dynamic Analysis ◽  
Journal Bearing ◽  
Static And Dynamic Analysis ◽  
Hydrodynamic Journal Bearing

Experimental Rotordynamic Parameter Study at Turbochargers With Hydrodynamic Journal Bearing Systems

2015 ◽  
Author(s):  
Alexander T. Hummel ◽  
Michael Rott ◽  
Christoph Schneider ◽  
David Kuschnertschuk ◽  
Günther Stelzner ◽  
...  
Keyword(s):  
Experimental Approach ◽  
Test Bench ◽  
Journal Bearing ◽  
Commercial Vehicle ◽  
Real Life ◽  
Parameter Study ◽  
Thrust Bearings ◽  
Hot Gas ◽  
Hydrodynamic Journal Bearing ◽  
Run Up

This paper presents an evaluation of various rotordynamic parameters at commercial vehicle turbochargers, which are operated supercritically in full-floating hydrodynamic journal bearing systems. The evaluation is conducted by using an experimental approach to determine the performance of the rotor-bearing-system in a real-life assembly at a hot gas test bench. This takes support stiffness, external heating and the excitation by seals, thrust bearings and gas forces into account, while Engine-specific excitation is not present. The system’s ability to carry additional unbalance load at different oil support pressures without the occurrence of mixed friction throughout a complete run-up is assessed. By executing this assessment for multiple assemblies with different bearings, rotors and oil types, the influence of main design and boundary parameters on the effective journal bearing performance of turbochargers is quantified.

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