https://cyberleninka.org/article/n/544115.pdf

Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings

Effect of textured area on the performances of a hydrodynamic journal bearing

Efficiency of laser surface texturing in the reduction of friction under mixed lubrication

The friction characteristic of a journal bearing with dimpled bushings manufactured using the machining and the chemical etching techniques is investigated. A series of experimental results is presented to examine the effect of dimples on the Stribeck curve. Load, oil type, dimple size, depth and shape are varied to explore their influence on the friction characteristics. It is shown that with proper dimensions of dimples, the friction performance of journal bearings can be improved, particularly for light oils. The results reveal that in mixed lubrication regime, the so-called secondary lubrication effect in the dimpled area is the main mechanism responsible for improvement of performance. Experimental results also indicate that a bushing with etched dimples over the entire circumference offer a better frictional performance than a bushing with dimples etched on half of its circumference.

An Experimental Investigation of Dimple Effect on the Stribeck Curve of Journal Bearings

CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant

The Stribeck curve plays an important role in identifying boundary, mixed, elastohydrodynamic, and hydrodynamic lubrication regimes. Recent advances in elastohydrodynamic lubrication together with rough surface interaction have made it possible to develop a methodology for predicting the trend of the Stribeck curve. In this paper; we report the results of a series of experiments performed on a journal bearing together with a theoretical prediction of the Stribeck-type behavior. Various loads and oil temperatures are considered. The comparison between the experimental results with a mixed elastohydrodynamic lubrication model for line contacts is indicative of good agreement.

The Stribeck Curve: Experimental Results and Theoretical Prediction

The development and exploration of the Stribeck curve have a long history. It originated based on a series of experiments that were devoted to the characterization of the behavior of fluid-film bearings, which proved to be useful for defining the boundary, mixed and hydrodynamic lubrication regimes. In this paper, we present the results of a series of experiments with a journal bearing operating under different loads and oil inlet temperatures. Of interest in the present study is to explore the behavior of lift-off speed and the factors that affect it. An equation is proposed to predict the lift-off speed. Its results are compared with Vogelpohl’s equation.

On the lift-off speed in journal bearings

On the Lift-off Speed in Journal Bearings

A series of experimental results is presented to explore the frictional characteristics of a grease-lubricated journal bearing Load, grease type, and bushing material are varied to examine their effects on the friction coefficient The results attest to the existence of distinctive regimes in grease lubrication akin to the oil-lubricated Stribeck curve A mixed elastohydrodynamic lubrication model for line contacts is employed to estimate the coefficient of friction in mixed lubrication regime The simulation results capture the basic characteristics of mixed lubrication

Xiaobin Lu

Papers

An Experimental Investigation of Dimple Effect on the Stribeck Curve of Journal Bearings

The Stribeck Curve: Experimental Results and Theoretical Prediction

On the lift-off speed in journal bearings

On the Lift-off Speed in Journal Bearings

An Experimental Investigation of Grease-Lubricated Journal Bearings