| In this paper,the lubrication analysis model of journal bearing under the condition of high speed and low viscosity lubricant is established based on the theory of turbulent lubrication and its thermohydrodynamic lubrication is analyzed.The thermal effect on the lubricating performance of journal bearing is analyzed.Using mass conservation algorithm simultaneous Reynolds equation,energy equation,solid heat conduction equation and lubricant adhesion temperature equation which are based on the theory of the turbulent lubrication,and thermohydrodynamic lubrication of journal bearing is analyzed.The bearing oil film pressure distribution under different speed and eccentricity are given and analyzed bearing capacity of the oil film,maximum film pressure,end leakage flow-rate and friction coefficient and other parameters changed with the speed and eccentricity.The results of the calculation of the thermal effect of the lubricant without considering the thermal effect and the lubricant viscosity-temperature equation considering the thermal effect shows that the value of lubricant viscosity will reduce and the impact of sliding bearing lubrication significantly when considering thermal effect.The solving of model of journal bearing established by using ANSYS finite element method got the thermal deformation deformation-matrix and the method for solving oil film thickness improved.The thermohydrodynamic lubrication properties of journal bearing is analyzed and the bearing oil film pressure distribution under different speed are given and analyzed load-carrying capacity,maximum film pressure,end leakage flow-rate and friction coefficient and other parameters changed with the speed.The result of the calculation considering thermal effect with those not considering thermal effect shows that the value of oil film thickness will reduce and the impact of lubrication performance of bearing significantly when considering thermal effect. |
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