Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Abstract

This paper concerns with theoretical investigation to predict the influence of cylindrical textures on the static and dynamic performance characteristics of hydrodynamic journal bearing system and the performance is compared with smooth surface bearing. The Reynolds equation governing the fluid–film between the journal and the bearing surface is solved numerically with the assistance of finite element method and the performance characteristics are evaluated as a function of eccentricity ratio, dimple depth and its location. In this study, four journal bearing configurations viz: smooth (non-textured), full-textured, partially textured-I, and partially textured-II are considered for the evaluation of theoretical results. The simulated results indicate that the influence of surface textures is more significant when the textures were created in upstream zone of 126°–286° and dimple aspect ratio nearly 1.0.

Influence of Surface Texture on the Performance of Hydrodynamic Journal Bearing Operating under Turbulent Regime

“…Load carrying capacity (F o ): The reaction components of the fluid-film along the X and Z directions are respectively given by [13]:…”

“…Stiffness coefficients of fluid-film: The stiffness coefficients of fluid-film in non-dimensional form can be given as [13]:…”

“…Where i = direction of force q j = direction of journal centre displacement (q j = x, z) Stiffness coefficient matrix will be: Fluid-film damping coefficients: The dimensionless fluidfilm damping coefficients can be expressed as [13]: q 4 j represents the velocity component of journal center (x, z). Damping coefficient matrix can be given by:…”

“…on static performance parameter of journal bearing system. A very few studies [12,13] are also available dealing with the texture parameters on the influence of dynamic performance of journal bearing system.…”

“…Configuration-2: For the creation of configuration-2, the results are taken for the cylindrical textures for different angle ranges, along the circumferential direction of bearing. Based upon the best load carrying capacity [13], the angle range of textures has been selected from 126° to 286° as shown in Fig. 1(f).…”