A Mixed-TEHD Model for Journal-Bearing Conformal Contact—Part II: Contact, Film Thickness, and Performance Analyses

Abstract

Investigation of the mixed lubrication of journal-bearing conformal contacts is very important for failure prevention and design improvement. This paper studies the asperity contact in heavily loaded journal bearings with Lee and Ren’s asperity contact theory in a newly developed mixed-TEHD (Thermal Elasto-Hydro-Dynamic) model and analyzes the performance of simulated journal bearings under high eccentricity ratios. The effects of operating conditions, bearing structures, and thermal conditions on the contact severity were numerically investigated. The results indicate that the asperity contact pressure and the performance of journal bearings in the mixed lubrication are strongly affected by the geometric design and the thermal-elastic deformations. The heat transfer of the bearing-lubricant-journal system was also shown to play a role.

Water lubrication of PTFE composites

“…The transfer is more intense near the edge of the shoe because of the tendency of having mixt contact due to sharp a decrease in water pressure distribution in these zones, as predicted by theoretical models (Wang and Shi, 1998).…”

A Method of Influence Functions for Thermal Analyses of Tribological Elements

“…The bearing was meshed with 1120 elements and 8960 nodes. Both the influence-function method and the full-TEHD model developed by Shi and Wang (19), (20) were applied to analyze the lubrication of the simulated bearing. Wang and Shi's full-TEHD model has been compared with published data with satisfaction and therefore is reliable to be used as a reference.…”

“…However, most of the tribological elements may only experience small deformations. The authors compared the thermal and elastic deformations (20) for an aluminum-alloy bearing and found that they were in the same order of magnitude which was severe for contact analyses but insignificant to the macro-structure considerations. Therefore, it may be safe to use %for most applications.…”

Identification of a Material–Lubricant Pairing and Operating Conditions That Lead to the Failure of Porous Journal Bearing Systems

“…They operate in the hydrodynamic lubrication regime for most of their lifetime, as long as the pores are still sufficiently filled with lubricant [7]. Under startand-stop conditions (e.g., windscreen wipers [8,9]) or after long and severe operation, the lubricant regime is more likely to be mixed or boundary lubricated, depending on the quantity of lubricant still present in the pores. More generally, the lubrication mechanisms occurring in soft contacts were extensively studied in [10,11].…”