ANALYSIS OF HIGH SPEED HYDROSTATIC BEARING’S PERFORMANCE CONSIDERING THERMAL EFFECT OF LUBRICATION FLUID

To study the influence to high speed hydrostatic bearing’s performance from lubrication fluid characteristics of oil film,the thermal effect of lubricating fluid’s viscosity,density and specific heat capacity is considered,and put forward a method to solve the Navier-Stokes（ N-S） equations combined with a custom function program to introduce lubricating fluid relations under thermal effect. Take a fast sliding bearing as example,using this method to calculate and discuss the effect of various factors on the bearing performance,the performance parameters of bearing are compared with the situation of ignoring lubricating fluid features. Results show that the numerical distribution of the oil-film fluid properties have a significant change with the temperature as considering the lubrication fluid characteristics under thermal effect; Viscosity play a critical role on performance parameters of the bearing,while considering thermal effect,the density has a certain lower effect on oil-film maximum pressure,and the specific heat has capacity to influence the maximum temperature and friction power consumption of the shaft neck,so comprehensive consideration of lubrication fluid features is more in line with the actual working condition. The research results have guidance on the study of oil reservoir structure on the influence of fluid properties and the choice of lubricating oil,etc