Static Characteristics of Journal Bearings With Square Dimples
Static Characteristics of Journal Bearings With Square Dimples
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DOI：
10.1115/1.4035778
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发表时间：
2017-09
影响因子：
2.5
通讯作者：
Hiroyuki Yamada;H. Taura;S. Kaneko
中科院分区：
文献类型：
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作者：
Hiroyuki Yamada;H. Taura;S. Kaneko
表面纹理是一种用于改善滑动轴承的摩擦和流体动力学性能的技术，因为微观纹理可以作为油的储存器或碎片的捕集器，并且还可以产生流体动力学压力。在过去的二十年里，许多研究人员已经通过实验证明，各种摩擦学元件的织构化可以降低摩擦力和磨损，有助于改善润滑性能。一些数值研究已经检查了流体动力润滑条件，并报告说，表面纹理会影响轴颈轴承的静态特性，如它们的承载能力和摩擦扭矩。然而，由于缺乏实验研究，这些数值模型的有效性尚未得到证实。本研究提出了一个数值模型，包括惯性效应和能量损失的边缘上的凹坑的表面上的径向轴承，以调查轴承的静态特性。实验验证的径向轴承也进行了一个均匀的方形凹坑模式在他们的全轴承表面。模型计算结果与实验结果吻合较好，验证了模型的有效性。结果表明，在相同的工作条件下，毛面轴承产生更高的偏心率和更小的姿态角比传统的光滑表面。这种趋势在高雷诺数运行条件下和具有大量凹坑的纹理轴承中变得更加明显。
Surface texturing is a technique for improving frictional and hydrodynamic performances of journal bearings because microtextures can serve as reservoirs for oil or traps for debris and may also generate hydrodynamic pressure. Over the past two decades, many researchers have experimentally demonstrated that texturing of various tribological elements can reduce friction force and wear, contributing to improvement of lubrication performance. Some numerical studies have examined the hydrodynamic lubrication conditions and reported that surface texturing affects the static characteristics of journal bearings, such as their load carrying capacity and friction torque. However, the validity of these numerical models has not been confirmed because of a lack of experimental studies. This study proposes a numerical model that includes both inertial effects and energy loss at the edges of dimples on the surface of a journal bearing in order to investigate the bearing's static characteristics. Experimental verification of journal bearings is also conducted with a uniform square-dimple pattern on their full-bearing surface. The results obtained by the model agree well with those of experiment, confirming the model's validity. These results show that under the same operating conditions, textured bearings yield a higher eccentricity ratio and lower attitude angle than the conventional ones with a smooth surface. This tendency becomes more marked for high Reynolds number operating conditions and for textured bearings with a large number of dimples.