Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
Volume 235, Issue 11, Pages 2257-2271Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1350650121999172
Keywords
Dynamic coefficients; stern tube bearing; roughness; deformation; mixed lubrication
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The dynamic coefficients of water-lubricated marine stern tube bearings are enhanced by roughness, but weakened when considering bush deformation. Additionally, rougher bearings have significantly smaller dynamic coefficients than smoother bearings as the misalignment angle increases.
Dynamic analysis of water-lubricated marine stern tube bearing is incompatible with that of ordinary oil-lubricated bearing due to the deformation of compliant bushes and non-negligible roughness effects. A modified bearing dynamic analysis model embracing roughness and dynamic characteristics of a non-metal bush is proposed. Based on the model, Reynolds equations of perturbed pressures of water film considering roughness, deformation, and misalignment simultaneously are derived for the first time and solved by coupling the finite difference method and the finite-element method. The results show that dynamic coefficients are enhanced due to roughness when the minimum film thickness ratio exceeds a threshold around 2. The roughness effect is debilitated but the valid range of roughness is extended when bush deformation is considered. Additionally, dynamic coefficients of rougher bearing become obviously smaller than those of smoother bearing as the misalignment angle grows.
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