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.
