The analysis of elastohydrodynamic lubrication in the textured journal bearing

Abstract

In this work, the influences of flexibility and surface texture on the performances of a finite-long journal bearing have been investigated theoretically. Reynolds equation has been solved by using finite difference method. In this study, Winkler foundation model has been used to calculate the elastic deformation of the bearing bush or housing. The steady-state characteristics of a lubricated finite-long journal bearing are studied in the textured and untextured bearing surface, respectively. The simulation results of the present study indicate that the surface texture can appreciably change the shaft center-line locus and oil film pressure distribution comparatively to the smooth case. The texture arrangements on the bearing surface, the texture number in the circumferential or axial directions, and the texture depth in the radial direction, all of them have significant influences on the static characteristics of a flexible journal bearing.

A multiobjective optimization of journal bearing with double parabolic profiles and groove textures under steady operating conditions

“…Clearly the study of six factors at three optional levels needs 3 [6] simulation tests if full factorial designs are implemented. To reduce the computing cost, Taguchi method with orthogonal array L 18 is adopted here, as shown in Table 6.…”

“…Literatures [5][6][7][8][9][10] showed the partial textures can positively affect bearing performance, but the optimal locations are some different depending on geometrical parameters and working conditions [5]. Yu [6] and Lin [7] showed the textures located at rising phase of pressure field increases load carrying capacity, while the textures located at falling phase of pressure field reduces load carrying capacity. However, Tala-Ighil et al [8,9] showed the textures located in declining part of pressure field can generate extra hydrodynamic lift.…”

Quasi-Static Load Sharing Characteristics of a Planetary Gear Set with Planet Journal Bearings

“…where, ϕ 2 is the angular starting position of oil film rupture along the circumferential direction [24], which can be obtained when the convergence criterion is reached. The convergence criterion to stop the iteration is expressed as…”

Effects of double parabolic profiles with groove textures on the hydrodynamic lubrication performance of journal bearing under steady operating conditions

“…Obviously, for the journal bearing with plain profile, d z = d tex = 0, and for the journal bearing with only double parabolic profiles, d tex = 0. In this study, the elastic deformation d e is obtained by the Winkler/Column model [26], which provides a simpler way than finite element method [27] to estimate elastic deformation and has been used in some literatures [21,[28][29][30]. The utilized model assumes that the local elastic deformation is only dependent on the local film pressure, as expressed in equation (3)…”

“…Matele and Pandey [20] developed a numerical model to investigate the effects of texture locations on the bushing surface, which showed that compared with the plain journal bearing, the partial textured bearing with proper location is found to be more stable. Yu et al [21] investigated the effects of surface texture and flexibility on the performance of journal bearing theoretically. Their results showed that when the textures are located at the rising phase of the pressure field, higher texture density can increase load carrying capacity, while the textures are located at the falling phase of the pressure field, it is harmful to the load carrying capacity.…”