Performance improvement of an oil-lubricated journal bearing using bionic-textures fused micro-pockets

Abstract

This article investigates the static and dynamic performances of bionic-textures fused micro-pocketed journal bearing considering cavitation. The new bionic textures placed inside the micro-pocket towards the trailing side has been conceived inspired from the skins of freshwater fish. The mass conservation satisfying partial differential lubrication equations for the static and dynamic pressures are discretized using finite volume method (FVM) followed by simultaneous solution of the system equations using the Fischer-Burmeister-Newton-Schur (FBNS) and the Broyden's method with Sherman-Morrison formula. The minimum film thickness, friction force, temperature rise, dynamic coefficients, effective damping and stiffness, critical mass and system characteristic roots have been explored with new conceived bores and the numerical results have also been compared with conventional plain and conventional pocketed bore bearings. Significant static and dynamic performance improvements have been found in presence of bionic textures fused micro-pocketed bores in comparison to conventional bores.

A solution for finite journal bearings by using physics-informed neural networks with both soft and hard constrains

“…Many numerical methods have been used to solve the Reynolds equation. Such as the finite difference method (FDM), finite element method and finite volume method (Lugt and Morales-Espejel, 2011; Habchi et al , 2007; Pattnayak et al , 2002; Gengyuan et al , 2015).…”

Effect of grease grades on the tribological and vibrational behaviours of a radial ball bearing: Conventional vs. micro-grooved outer races

“…In recent years to explore and improve the tribodynamic performances of generic concentrated contacts such as vibration, film thickness and friction coefficient/torque etc., different surface textures have been employed. The surface textures comprising of the presence of nano/micro geometries such as spherical/ellipsoidal, [4][5][6][7][8][9][10][11][12][13][14][15] triangular dimples, 16 micro-grooves/pockets, [17][18][19][20][21][22] and bionic shapes 17,23,24 on the mating surfaces have widely been employed to understand their roles on the performances. Based on the numerical 7,17,18,23 and experimental [4][5][6][7][8][9][10][11][12][13][14][15][16][19][20][21][22][24][25][26] investigations performed with textured lubricated concentrated contacts, favorable results in terms of redu...…”

“…The surface textures comprising of the presence of nano/micro geometries such as spherical/ellipsoidal, 4–15 triangular dimples, 16 micro- grooves/pockets, 17–22 and bionic shapes 17,23,24 on the mating surfaces have widely been employed to understand their roles on the performances. Based on the numerical 7,17,18,23 and experimental 4–16,19–22,24–26 investigations performed with textured lubricated concentrated contacts, favorable results in terms of reductions in temperature and frictional torque/ friction coefficient and increase in film thickness have been found. Literature review revealed that the geometries of tiny structures and their placing on the contacting surfaces (shape, size, position and orientation) along with their density have played great role on the tribo-performances of the concentrated contacts.…”

Design of Hydrodynamically Lubricated a New Micro-pocketed Tilting Pad Thrust Bearing Based on Simulated Performance Parameters

“…It has been understood that when the plain runner surface interfaces with the textured bearing surface in the presence of lubricant at favorable operating parameters, numerous micro-hydrodynamic bearings get formed, which sustains the applied external load energy efficiently [15][16][17]. In addition to this, the micro/tiny geometries present in the texture act as innumerable lubricant reservoirs, which trap the wear debris and contaminants [18][19][20]. This mainly reduces three-body abrasion in the mixed and boundary lubrication regimes at the time of start and stop of runner/rotor.…”