| ZHU Chun-xia,WANG De-quan,YANG Xiao-nan,CHANG Yong-xiang.Characterization of Asymmetric Surface Texture and Analysis of Hydrodynamic Lubrication Effect[J],51(3):66-75 |
| Characterization of Asymmetric Surface Texture and Analysis of Hydrodynamic Lubrication Effect |
| Received:March 31, 2021 Revised:August 10, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.006 |
| KeyWord:asymmetric surface texture characterization equation W-M function CFD hydrodynamic lubrication effect |
| Author | Institution |
| ZHU Chun-xia |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| WANG De-quan |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| YANG Xiao-nan |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| CHANG Yong-xiang |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
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| Abstract: |
| The work aims to establish the characterization equation of the rough plane with asymmetric surface texture and analyze the effect of the equation parameters on the morphology and study the lubrication characteristics of the asymmetric surface texture under hydrodynamic lubrication conditions based on the texture plane reconstructed by the characterization equation. According to the machining process of the asymmetric texture plane, the rough surface was reconstructed based on the W-M function and then the morphology characteristic equation of the asymmetric texture was superimposed to achieve the mathematical characterization of the asymmetric surface texture of different sizes. The effects of surface texture parameters and rough surface parameters in the equation on the texture plane morphology were analyzed by Matlab software. The solid model of the hydrodynamic lubrication pressure oil film was established by the texture plane represented by the equation, and the CFD calculation of the pressure oil film was carried out. The pressure distribution law and streamline distribution law in the forward asymmetric, symmetric and reverse asymmetric textures were obtained respectively, and the hydrodynamic lubrication effect analysis of the asymmetric surface texture was realized. Among the parameters of the equation, the scale coefficient and fractal dimension mainly affected the variation range and frequency of the rough surface contour height. The microscopic contour height decreased at the same rate with the decrease of the scale coefficient, and the variation of the microscopic contour height became more and more violent with the gradual increase of the fractal dimension, and the frequency of variation became faster and faster. Some texture-related parameters, such as asymmetry rate and texture depth, specifically affected the morphology of the texture. The CFD analysis and calculation of lubrication pressure film showed that the pressure difference between the inlet and outlet of the forward asymmetric texture (k=2) was 1747 Pa, which was significantly greater than the 387 Pa of the symmetric texture (k=1) and the 707 Pa of the reverse asymmetric texture (k=0.5). The streamline distribution nephogram showed that the reflux effect in the forward asymmetric texture was more intense and the streamline distribution was more complex. The established characterization equation of the asymmetric texture plane can clearly describe its morphology, and the effect mechanism of the equation parameters on the morphology is clear. Moreover, the asymmetrical texture with reasonable configuration has obvious advantages in increasing load capacity and improving lubrication. |
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