## 4 Conclusions  
In order to solve the bearing in the service process due to high temperatures (\(\geq\)80 \({}^{\circ}\)C), to reduce the viscosity of lubricating oil caused by lubrication failure, based on the magnetic fluid viscous temperature, viscous pressure and magnetic viscosity characteristics, the design of magnetic fluid lubrication bearing structure, and to discuss the pressure, temperature and magnetic field distribution of its bearings, the following conclusions were drawn:  
1. The viscosity of the magnetic fluid decreases exponentially with increasing temperature, increases linearly with increasing pressure, and increases with increasing field strength; the viscosity of the magnetic fluid rises first and then stabilizes, with a similar upward trend to the magnetization curve.
2. The oil film pressure distribution is separated by the minimum oil film thickness area into two approximately symmetrical high-pressure and low-pressure areas, with the bearing eccentricity increases, the pressure difference between high and low pressure gradually increases, and the high-pressure and low-pressure areas are gradually concentrated towards the minimum oil film thickness area, the oil film wedge effect is enhanced.  
3. The oil film high temperature zone is mainly distributed in the middle of the axial region and around the minimum oil film thickness area; with the bearing eccentricity increases, the oil film high temperature zone temperature increases and concentrates around the middle of the axial region and the minimum oil film thickness area, the heat dissipation method is mainly heat conduction and convection heat dissipation. 4. The magnetic field of magnetic fluid bearing is distributed in the clearance between the shaft and the journal, and when the eccentricity of the bearing is increased, the magnetic induction intensity in the maximum oil film thickness area remains the same, while the magnetic induction intensity in the minimum oil film thickness area is the strongest. In addition, the magnetic fluid bearing has a certain sealing pressure resistance; high eccentricity of the magnetic fluid bearing sealing performance is better.  
The results of the feasibility of using magnetic fluids to lubricate sliding bearings with different eccentricities are presented. Due to the unique viscous-temperature, viscous-pressure and magnetic-viscous properties of magnetic fluids, active lubrication can be achieved under an applied magnetic field, resulting in reliable service over a wide temperature range. However, the magnetic flux density required for bearing clearance varies under different operating conditions, and the magnetic field must be adjustable to achieve reliable service over a wide temperature range. The principle of electromagnetic induction can be relied upon to turn permanent magnets into a magnetic field generating device with adjustable magnetic field strength, and the study of magnetic flux density required for bearing lubrication under different operating conditions is of practical significance for the application of magnetic fluids in bearings.  
Conceptualization, A.W. and J.Y.; methodology, J.P.; software, H.W.; validation, A.W., J.Y. and H.W.; formal analysis, A.W.; investigation, A.W.; resources, A.W.; data curation, A.W.; writing--original draft preparation, A.W.; writing--review and editing, A.W.; visualization, J.P.; supervision, J.P.; project administration, J.P.; funding acquisition, J.P. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China, grant number 52005004 and Open Project of Key Laboratory of Helicopter Transmission Technology, Nanjing University of Aeronautics and Astronautics, grant number HTL-O-20G09.  
Not applicable.  
The authors declare no conflict of interest.