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标题：Effect of lubricant temperature on the dynamic and stability behavior of journal bearing
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作者：Basim A. Abass ; Zainab S. Hamzah
期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2018
卷号：9
期号：4
页码：1-12
出版社：International Energy and Environment Foundation (IEEF)
摘要：The effect of temperature on the dynamic behavior of journal bearing has been investigated in the present work. Time dependent Reynold's equation modified to include the effect of oil film temperature has been perturbed in order to calculate the eight dynamic coefficients required to evaluate the dynamic characteristcs of the journal bearing. The oil film temperature was obtained by solving numerically the energy and heat conduction equation simultaneously with the Reynolds equation using appropriate boundary conditions. Suitable oil viscosity temperature has been used which couples the Reynolds and the energy equations. The effects of bearing aspect ratios and journal speed on the dynamic and stability characteristics of the rotor bearing system have been studied. Ranges of bearing aspect ratio from 0.5 to 1.5, speeds from 2000 to 8000 rpm have been considered. The mathematical model as well as the computer program prepared to solve the governing equations has been validated by comparing the results for the dynamic coefficients (stiffness and damping) obtained in the present work with that obtained experimental results from the literatures. The results seem to be in a good agreement with percentage of error less than 3%. Comparing to the isothermal analysis, a destabilizing effect has been noticed when the oil film temperature was considered. The results show that the critical mass decreases by 33% when the bearing works at an eccentricity ratio of 0.4.
关键词：Journal bearing; Thermo;hydrodynamic; Reynolds equation; Dynamic coefficients; Perturbation technique; Stability;