Abstract
In this paper, the elasto-hydrodynamic (EHD) performance of partial journal bearings has been studied. A numerical analysis has been conducted using the ANSYS Workbench (17.2) platform to investigate the performance of partial journal bearings. The lubricant used is considered Newtonian and incompressible fluid that flows steadily under laminar conditions, while the bearing material is assumed to be elastic, isotropic with smooth surface conditions. In the current FSI analysis, the lubricant flow has been predicted according to the finite_ volume method, while the finite element method has been adopted to compute the deformation and stress in the bearing surface. A wide range of operating and design conditions have been considered including the eccentricity ratio (0.1≤ε≤0.82), and arc bearing angle bearing (90ᵒ≤θ≤180ᵒ), while the values of bearing length to diameter ratio (L /D) and rotation speed (N) have been fixed at=0.77 and 1500r.p.m, respectively. The hydrodynamic pressure, performance characteristic of journal bearing, stress, and deformation have all been computed. It was found that the arc bearing angle and eccentricity ratio has a clear effect on the elasto-hydrodynamic properties of the partial bearings especially at high values of them.
Highlights
Partial journal bearing is one of the common types of hydrodynamic journal bearings
A thermo- hydrodynamic (THD) model proposed was used to a partial journal bearing of 80 degree arc, where a central load was applied for length diameter (L/D) ratio equals to 0.75 while clearance to radius (C/R) ratio equal to 0.002
The results obtained were calculated for a wide range of operating and design conditions have been considered including the eccentricity ratio(0.1≤ ε ≤0.82) and arc bearing angle (90o≤ θ ≤180o),while the values of bearing length to diameter ratio (L/D) and rotation speed (N) have been fixed at 0.77 and 1500rpm, respectively
Summary
Partial journal bearing is one of the common types of hydrodynamic journal bearings. It is widely used in industrial and daily life applications including rotary kilns, cement mills, and many other rotating types of machinery due to its lower power loss. Compared to smooth surfaces and by used hypothesis rigid pad (HD) model, it showed the largest effect of roughness resulting in an increase of (30%) in the minimum mean film – thickness, and more of (54%) in friction torque. The circumferential scratches which appear in the inner bearing surface was studied analytically by Dobrica and Fillon, (2008) and explained their effect on the thermo-hydrodynamic performance- characteristics such as minimum film thickness(hmin), maximum pressure(Pmax), mean oil film temperature(Tmean), and friction torque. In order to evaluate overall bearing performance degradation, several working parameters were calculated minimum oil film thickness (hmin), mean oil temperature (Tmean) and maximum hydrodynamic pressure (PMAX). The current project aims to study the effect of arc bearing angle(θ) at different eccentricity ratio(ε) on the elasto-hydrodynamic performance of a partial journal bearings where the inner surface of bearing is smooth under static conditions, various geometric shapes and operating conditions
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