Influence of roughness and axial movement on the mixed lubrication performance of stern bearing
To solve the key problem of the abnormal wear state of a stern bearing when the hull of a large ship is deformed during navigation,this paper explores the influence of wear surface roughness changes and axial move-ments on the hybrid lubrication performance of the stern bearing.A mixed lubrication model coupling the bearing's axial movement and surface roughness is established,the distribution of bearing lubrication characteristics is ob-tained through numerical simulations,and the influence of axial movement and roughness on the mixed lubrication characteristics of the bearing is analyzed to validate the lubrication model.The calculation results show that the oil film thickness decreases nonlinearly along the axial direction under the coupling effect of axial movement and jour-nal misalignment.The oil film and contact pressures exhibit local peaks,and the bearing bush appears to have large local deformation.The increase in axial speed will enhance the hydrodynamic lubrication effect on the bear-ing,and the increase in the misalignment angle enables the axial movement to strongly influence lubrication charac-teristics.The greater the roughness,the stronger the load-carrying capacity and the more serious the contact situa-tion,which will accelerate the local wear of the bearing.
ship stern bearingmixed lubricationaxial movementroughnesslocal contactjournal misalign-mentlubrication performancenumerical model
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