Dynamic and stability analysis of crescent geometry-possessing textured journal bearing using nanolubricant

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Industrial Lubrication and Tribology Pub Date : 2024-07-02 DOI:10.1108/ilt-03-2024-0089

Deepak Byotra, Sanjay Sharma

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Abstract

Purpose

This study aims to find the dynamic performance parameters of the journal bearing with micro geometries patterning the arc (crescent) shape textures provided in three specific regions of the journal bearing: the full, the second half and the increasing pressure region. The dynamic behavior of textured journal bearings has been analyzed by computing dynamic parameters and linear and non-linear trajectories.

Design/methodology/approach

The lubricant flows between the bearing and journal surface are governed by Reynold’s equation, which has been solved by finite the element method. The dynamic performance parameters such as stiffness, damping, threshold speed, critical mass and whirl frequency ratio are examined under various operating conditions by considering various ranges of eccentricity ratios and texture depths. Linear and non-linear equations of motion have been solved with Ranga–Kutta method to get journal motion trajectories. Also, the impact of adding aluminum oxide and copper oxide nanoparticles to the base lubricant in combination with arc-shaped textures is analyzed to further see any enhancement in the performance parameters.

Findings

The findings demonstrated that direct stiffness and damping parameters increased to their maximum level with six textures in the pressure-increasing region when compared with the untextured surface. Also, nanoparticle additives showed improvements above the highest value attained with no inclusion of additives in the same region or quantity of textures.

Originality/value

Engineers may design bearings with improved stability and overall performance if they understand how texture form impacts dynamic properties.

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使用纳米润滑剂的新月形几何纹理轴颈轴承的动态和稳定性分析

目的本研究旨在找出在轴颈轴承的三个特定区域（全压区、后半压区和增压区）具有弧形（新月形）纹理的微几何图案的轴颈轴承的动态性能参数。通过计算动态参数以及线性和非线性轨迹，分析了纹理轴颈轴承的动态行为。设计/方法/途径轴承和轴颈表面之间的润滑剂流动受雷诺方程控制，该方程已通过有限元法求解。通过考虑不同范围的偏心比和纹理深度，研究了各种工作条件下的动态性能参数，如刚度、阻尼、临界速度、临界质量和旋流频率比。用 Ranga-Kutta 方法求解了线性和非线性运动方程，得到了轴颈运动轨迹。此外，还分析了在基础润滑油中添加氧化铝和氧化铜纳米颗粒以及弧形纹理的影响，以进一步了解性能参数的改善情况。研究结果研究结果表明，与未纹理表面相比，在压力增加区域，六种纹理的直接刚度和阻尼参数均达到最大值。此外，纳米颗粒添加剂的改善效果超过了在相同区域或纹理数量下不添加添加剂所达到的最高值。原创性/价值工程师如果了解纹理形式如何影响动态特性，就可以设计出稳定性和整体性能更高的轴承。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.