A thermal mixed lubrication model to study the textured ring/liner conjunction
TL;DR: In this article, a semi-deterministic analytic thermal solution is presented for the rough textured ring/liner conjunction, which reveals more detailed information about the tribological performance of the textured surfaces in terms of the thermal effects and the viscosity change.
About: This article is published in Tribology International.The article was published on 2016-09-01. It has received 45 citations till now. The article focuses on the topics: Lubrication.
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TL;DR: In this article, a mass-conserving model based on the Elrod-Adams model was developed to deal with the effect of local surface properties, such as textures and roughness.
41 citations
TL;DR: In this article, the tribological and sealing performance of a piston ring with specially designed textured surface in a diesel engine is investigated experimentally, and the results of compression tests with pocketed textures show a slight improvement in the sealing performance compared to untextured piston rings.
Abstract: The tribological and sealing performance of a piston ring with specially designed textured surface in a diesel engine are investigated experimentally. For this purpose, a motorized engine test rig is used to assess the frictional characteristics of compression piston rings with surface-texture pockets with optimum geometries fabricated on their surfaces. Experimental results show that lasered pockets led to a reduction of up to about 15 % in the total friction between cylinder liner and piston assembly over a wide range of operating speed. Further, the results of compression tests with pocketed textures show a slight improvement in the sealing performance compared to untextured piston rings.
36 citations
TL;DR: In this paper, a thermo-elastohydrodynamic (TEHD) lubrication model for hydraulic rod O-ring seals under mixed-lubrication conditions is developed to investigate the influence of thermal effect on seal behavior.
24 citations
TL;DR: In this article, a combined mixed lubrication and wear model was presented to study the running-in process of the ring/liner system, where the elastic-plastic asperity deformation was considered, as well as the evolution of the as perity height distribution.
18 citations
TL;DR: The results show that the spherical dimples can produce a larger reduction of friction in mixed lubrication region, and reduce power loss significantly in the middle of the strokes.
Abstract: The effects of surface texture on the lubrication performance of a compression ring-cylinder liner system are studied in this paper. By considering the surface roughness of the compression ring and cylinder liner, a mixed lubrication model is presented to investigate the tribological behaviors of a barrel-shaped compression ring-cylinder liner system with spherical dimples on the liner. In order to determine the rupture and reformulation positions of fluid film accurately, the Jacoboson-Floberg-Olsson (JFO) cavitation boundary condition is applied to the mixed lubrication model for ensuring the mass-conservative law. On this basis, the minimum oil film thickness and average friction forces in the compression ring-cylinder liner system are investigated under the engine-like conditions by changing the dimple area density, radius, and depth. The wear load, average friction forces, and power loss of the compression ring-cylinder liner system with and without dimples are also compared for different compression ring face profiles. The results show that the spherical dimples can produce a larger reduction of friction in mixed lubrication region, and reduce power loss significantly in the middle of the strokes. In addition, higher reduction percentages of average friction forces and wear are obtained for smaller crown height or larger axial width.
18 citations
References
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01 Jun 1970
TL;DR: In this article, the authors give a general theory of contact between two rough plane surfaces and show that the important results of the previous models are unaffected: in particular, the load and the area of contact remain almost proportional, independently of the detailed mechanical and geometrical properties of the asperities.
Abstract: Most models of surface contact consider the surface roughness to be on one of the contacting surfaces only. The authors give a general theory of contact between two rough plane surfaces. They show that the important results of the previous models are unaffected: in particular, the load and the area of contact remain almost proportional, independently of the detailed mechanical and geometrical properties of the asperities. Further, a single-rough-surface model can always be found which will predict the same laws as a given two-rough-surface model, although the required model may be unrealistic. It does not seem possible to deduce the asperity shape or deformation mode from the load-compliance curve.
1,435 citations
TL;DR: In this paper, the authors provide a comparative summary of different modeling techniques for fluid flow, cavitation and micro-hydrodynamic effects for surface texturing, and provide the key findings.
590 citations
Book•
01 Jan 1966
555 citations
TL;DR: In this article, the potential use of a new technology of laser surface texturing (LST) in parallel thrust bearings is theoretically investigated, where the surface texture has the form of micro-dimples with pre-selected diameter, depth, and area density.
Abstract: The potential use of a new technology of laser surface texturing (LST) in parallel thrust bearings is theoretically investigated. The surface texture has the form of micro-dimples with pre-selected diameter, depth, and area density. It can be applied to only a portion of the bearing area (partial LST) or the full bearing area (full LST). Optimum parameters of the dimples, and best LST mode, are found in order to obtain maximum load carrying capacity for a thrust bearing having parallel mating surfaces. A comparison is made with optimum linear and stepped sliders showing that parallel LST sliders can provide similar load carrying capacity. Scheduled for Presentation at the 58th Annual Meeting in New York City April 28–May 1, 2003
475 citations