Simulation And Experimental Study Of Lubrication Performance Of Thrust Bearings In Marine Propulsion Shaft System

The tilting tile thrust bearing is an indispensable component of the ship propulsion shaft system,bearing the main task of transmitting thrust and overcoming the ship’s navigation resistance,and its lubrication performance directly affects the safety and reliability of the ship propulsion shaft system.In this paper,we take the tilting tile thrust bearing of the marine propulsion shaft system as the research object,and improve the safety and stability of the propulsion shaft system as the main direction,and carry out research on the influence of different working conditions and different structures on the lubrication performance of the tilting tile thrust bearing,improving the existing calculation platform and solving the basic lubrication performance of the tilting tile thrust bearing and the lubrication performance under tilting working conditions,in which the lubrication performance parameters include minimum oil film thickness,maximum oil film pressure,maximum temperature,block power consumption,flow rate and maximum thermal spring deformation of the block,etc.The main research contents are as follows:Firstly,the background of the use of tilting tile thrust bearings in marine shaft systems is analysed,the lubrication performance calculation model of tilting tile thrust bearings under ideal operating conditions is established,the lubrication performance of thrust bearings under different operating conditions of the ship is calculated and analysed,the lubrication performance of four and six tile thrust bearings is calculated and analysed,and the change law of lubrication performance of eight tile thrust bearings is compared,then for the change of lubrication performance of thrust bearings under hydrostatic pressure assisted Then,for the change of lubrication performance of thrust bearing under static pressure,the performance algorithm of thrust bearing under dynamic and static pressure coupling is established,the lubrication performance of tilting tile thrust bearing with different oil cavity structure is studied,and the advantage of double rectangular groove static pressure cavity is verified.Then,for the actual operation of the shaft system tilt phenomenon on the impact of thrust bearing lubrication performance,the tiltable tile thrust bearing thermal-elastic fluid dynamic pressure lubrication performance calculation model was established under the axis tilt condition,the tiltable tile thrust bearing lubrication performance under different tilt angles was calculated and analyzed,and the influence of different tilt conditions on the bearing lubrication performance law was further studied.Finally,to verify the correctness of the theoretical model and computational data,the experimental principle and hardware and software system of the existing tilting pad thrust bearing test rig were explained.Sensors required for the test rig were installed and arranged accordingly.Finally,by conducting experiments,the maximum temperature,maximum oil film pressure,and minimum film thickness of the tilting pad thrust bearing under different loads were measured and compared with the theoretical calculation data through analysis.In summary,this paper studies the lubrication performance variation of marine shaft tilting pad thrust bearings under different operating conditions,different numbers of pads,different oil cavity structures,and tilting states.The results show that through the calculation and analysis of the lubrication performance of the thrust bearing under multiple parameters,researchers can better understand which bearing structure is suitable for which working condition,providing a certain reference value for the selection of marine operating conditions and the design of thrust bearings in propulsion shaft systems.