The purpose of this paper is to numerically study the effect of texture bottom profile on static, dynamic, and stability performance parameters of hydrodynamic journal bearings. The different performance parameters of square textured journal bearings with different bottom profiles are numerically investigated and compared with those of smooth journal bearing. There are five bottom profiles of this square texture: flat, curved, isosceles triangle (T1), oblique triangle (T2), and oblique triangle (T3). The static and dynamic coefficients are calculated by solving the steady-state Reynolds equation and the perturbation equations with FDM numerical technique. The performance characteristics under different texture distribution, depth, and bottom profiles are studied, and the current numerical results show that the selection of texture parameters is crucial to improve the static, dynamic, and stability performances of hydrodynamic journal bearing. Meanwhile, it is also found that the square texture with a flat bottom profile has a higher improvement in the values of static performance parameters in comparison to those other bottom profiles. Moreover, the simulation results indicate that the dynamic and stability performances improvement of textured journal bearing is also significant, especially when the eccentricity ratio is smaller.

中文翻译：

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纹理底部轮廓对轴颈轴承静动态特性的影响

本文的目的是数值研究纹理底部轮廓对流体动力滑动轴承静、动态和稳定性性能参数的影响。数值研究了不同底部轮廓的方形纹理轴颈轴承的不同性能参数，并与光滑轴颈轴承的性能参数进行了比较。这种方形纹理的底部轮廓有五个：平面、弯曲、等腰三角形（T1）、斜三角形（T2）和斜三角形（T3）。采用FDM数值技术求解稳态雷诺方程和微扰方程，计算静态和动态系数。研究了不同纹理分布、深度和底部剖面下的性能特征，目前的数值结果表明，纹理参数的选择对于提高流体动力轴颈轴承的静、动和稳定性性能至关重要。同时，还发现与其他底部轮廓相比，具有平坦底部轮廓的方形纹理在静态性能参数值方面具有更高的改进。此外，仿真结果表明，纹理轴颈轴承的动态和稳定性性能改进也很显着，尤其是在偏心比较小的情况下。还发现与其他底部轮廓相比，具有平坦底部轮廓的方形纹理在静态性能参数值方面具有更高的改进。此外，仿真结果表明，纹理轴颈轴承的动态和稳定性性能改进也很显着，尤其是在偏心比较小的情况下。还发现与其他底部轮廓相比，具有平坦底部轮廓的方形纹理在静态性能参数值方面具有更高的改进。此外，仿真结果表明，纹理轴颈轴承的动态和稳定性性能改进也很显着，尤其是在偏心比较小的情况下。