A mixed EHL model of grease lubrication considering surface roughness and the study of friction behavior

Wang, Daofei; Yang, Jialong; Wei, Pengchong; Pu, Wei

doi:10.1016/j.triboint.2020.106710

Cited by 32 publications

(18 citation statements)

References 16 publications

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“…In this study, the Reynolds equation considering the roughness and time-varying entrainment velocity direction is proposed, and the effectiveness of the new model is proven by comparing the difference and trend of central and minimum oil film thicknesses calculated using the existing and present models using the proof method form. 47 The central and minimum oil film thicknesses calculated using the proposed model are compared with the results calculated using the model in reference. 48 The results are shown in Figure 11; the detailed parameters are not repeated in this article; please check reference.…”

Section: Grease Lubrication Performance and Friction Performance Of T...mentioning

confidence: 99%

Numerical study on mixed thermal-elastohydrodynamic lubrication of grease lubricating lubricated spiral bevel gear for heavy-duty unmanned aerial vehicle

Wang

Zheng

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Aiming to solve the problem of the gear lubrication of unmanned aerial vehicles (UVAs), a grease mixed Thermal-elastohydrodynamic lubrication (TEHL) model is established, and the lubrication state of the gearbox of oil-powered heavy-duty UAVs is numerically analyzed. In this study, grease is regarded as a non-Newtonian fluid whose properties change nonlinearly with respect to pressure, temperature, and other conditions. The complex meshing state of a spiral bevel gear tooth surface is analyzed using the loaded tooth contact analysis (LTCA) method, and three points on the tooth surface are selected as samples to describe the lubrication state of the entire tooth surface. The thickness of grease film and the temperature rise of the tooth surface are studied in detail, considering the natural roughness of the tooth surface and influence of different greases. The results show that the established model agrees with results from the literature. The dangerous point of tooth surface lubrication is at the meshing midpoint. Under cruise conditions, the lubricating grease viscosity significantly influences the temperature rise of the tooth surface.

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Section: Grease Lubrication Performance and Friction Performance Of T...mentioning

confidence: 99%

Numerical study on mixed thermal-elastohydrodynamic lubrication of grease lubricating lubricated spiral bevel gear for heavy-duty unmanned aerial vehicle

Wang

Zheng

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…After the molding process, the contour of the fixture contact surface fluctuated, and its surface quality can be described by the roughness of the contour of the contact surface [31]. The model is shown in Fig.…”

Section: Analysis Of Surface Quality Of Fixture-bar Friction Pairmentioning

confidence: 99%

Research on the Influence of Contact Parameters on the Wear Characteristics of Fixture-bar Friction Pair in Low-stress Cropping

Guo¹,

Wang²,

Tao³

et al. 2021

Preprint

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New structure of grooved fixture with cambered surface is proposed to reduce wear of bar surface caused by fixture in low-stress cropping. The influence of fixture contact parameters and surface quality on wear characteristics of fixture-bar friction pair is researched by using FEM and orthogonal experiment. The radial wear degree is proposed to evaluate the wear degree of bars under four contact conditions, and the wear mechanism of the friction pair is analyzed by SEM. AE-stress-strain cropping platform is established to research the influence of roughness on the comprehensive wear state of the friction pair. Results indicate that the friction pair under A4B1C2D1E4 combination of contact parameters has the best wear reduction effect and lowest radial wear degree which is 0.0469mm2 and 34.50% lower than one of line contact. AE characteristic parameters curves reflect that under different contact condition, when Ra=0.4μm, the values of AE characteristic parameters are all the minimum and comprehensive wear state of the friction pair is the best.

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“…The presented results contribute to the tribological interpretation of the lubricated bearing degradation scenario without considering the mechanical properties of the lubricant. The aim of this article [10] is to simulate a mixed elastohydrodynamic lubrication (EHL) in real contact based on a grease rheological model. The model is designed to calculate the thickness of the lubricant film applied to a smooth and rough surface.…”

Section: Literature Reviewmentioning

confidence: 99%

Computational and experimental diagnostics of the shear properties of greases

et al. 2021

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The study of the properties of consistent and liquid oils is currently receiving much attention in tribology. This is because lubrication is one of the most effective ways to improve machine durability. At the same time are practically no mathematical descriptions of the mechanisms of grease lubrication, which is necessary for predicting and calculating the wear of machines. When studying the wear of surfaces under boundary lubrication conditions, it is necessary to know the stiffness characteristics of a thin layer of lubricant under normal and tangential stresses. In this paper, a method is proposed for determining the function of the contact tangential characteristics of a thin oil layer between solid deformable surfaces. A thin layer of grease is placed between two hard discs. By measuring the angle of rotation and the moment on the second disc, the dependence of the moment on the angle of rotation is determined. The contact mechanics of torsion of a thin circular lubricant layer has been developed and relations for determining the parameters of the shear diagram of a thin lubricant layer have been obtained. According to the developed method, the Fiol-3 grease was tested and the parameters of the shear diagram were determined.

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A mixed EHL model of grease lubrication considering surface roughness and the study of friction behavior

Cited by 32 publications

References 16 publications

Numerical study on mixed thermal-elastohydrodynamic lubrication of grease lubricating lubricated spiral bevel gear for heavy-duty unmanned aerial vehicle

Numerical study on mixed thermal-elastohydrodynamic lubrication of grease lubricating lubricated spiral bevel gear for heavy-duty unmanned aerial vehicle

Research on the Influence of Contact Parameters on the Wear Characteristics of Fixture-bar Friction Pair in Low-stress Cropping

Computational and experimental diagnostics of the shear properties of greases

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