EFFECT OF LUBRICANT TEMPERATURE ON THE DYNAMIC AND STABILITY BEHAVIOR OF NANO-LUBRICATED JOURNAL BEARING

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-03-08 DOI:10.32852/IQJFMME.V19I1.264

B. Abass, Zainab S. Hamzah

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引用次数: 2

Abstract

The effects of lubricant temperature on the dynamic behaviour of Nano-lubricated finite length journal bearings has been investigated in the present work. Modified time dependent Reynolds equation include the effect of oil film temperature was perturbed in order to calculate the eight dynamic coefficients (four stiffness, and four damping) required to evaluate the dynamic characteristics of the journal bearing, the oil film temperature was obtained by solving numerically the energy and heat conduction equations simultaneously with the Reynolds equation using appropriate boundary conditions. Suitable viscosity temperature model has been used to consider the effect of oil film temperature. The bearing lubricated with oil containing Titanium dioxide (TiO2 ) nanoparticles dispersed in to the base oil with various particle concentration. The effect of adding TiO2 Nano-particles with various particle concentrations (0.1%, 0.5%, 1%, 1.5% and 2%) in order to enhance its viscosity has been discussed. A validation to the mathematical model and the computer program written in Fortran90 prepared to solving the governing equation has been carried out by comparing the result for the dynamic coefficients (stiffness and damping) obtained in the present work with that obtained by Sheeja and Prabhu . The results seen to be in a good agreement with percentage of error less than 2%. The results obtained in the present study show that the bearing stiffness coefficients increases by 30% while the damping coefficients increased by 27% when the bearing lubricated with Nano lubricant that contains TiO2 Nano particles with particle concentration of (1.5%).

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润滑剂温度对纳米润滑滑动轴承动态稳定性能的影响

研究了润滑剂温度对纳米润滑有限长径向滑动轴承动态性能的影响。为了计算评估轴颈轴承动态特性所需的八个动态系数（四个刚度和四个阻尼），对包括油膜温度影响的修正的时间相关雷诺方程进行了扰动，采用适当的边界条件，通过数值求解能量和热传导方程以及雷诺方程，获得了油膜温度。采用合适的粘温模型考虑了油膜温度的影响。用分散在具有不同颗粒浓度的基础油中的含有二氧化钛（TiO2）纳米颗粒的油润滑轴承。讨论了添加不同颗粒浓度（0.1%、0.5%、1%、1.5%和2%）的TiO2纳米粒子以提高其粘度的效果。通过将本工作中获得的动态系数（刚度和阻尼）的结果与Sheeja和Prabhu获得的结果进行比较，对数学模型和用Fortran90编写的用于求解控制方程的计算机程序进行了验证。结果显示，误差百分比小于2%，两者吻合良好。本研究的结果表明，当使用含有颗粒浓度为（1.5%）的TiO2纳米粒子的纳米润滑剂润滑轴承时，轴承刚度系数增加了30%，阻尼系数增加了27%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Iraqi Journal for Mechanical and Materials Engineering

自引率

0.00%

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审稿时长

24 weeks