Analysis on static characteristics of ship tilting stern bearing based on CFD
Aiming at the problem of poor lubrication of the stern bearing due to excessive deflection and deformation in the actual operation of the ship's tail shaft,the tilting stern bearing structure with a single tilt in the bearing bore was pro-posed.The finite element models of horizontal stern bearing and tilting stern bearing were established respectively by using computational fluid dynamics(CFD)method.The static characteristics parameters of the stern bearing of two structures were calculated under the same journal tilt angle and eccentricity as well as different rotational speeds,and the effects of different structures on the static characteristics of lubrication at the same rotational speed were compared and analyzed,as well as the laws of the static characteristics parameters changing with rotational speed at the same structure.The calculation results show that under the same working condition,the maximum oil film pressure,load carrying capacity,friction force,friction coeffi-cient and side leakage of the tilting stern bearing are smaller than those of the horizontal stern bearing.With the increase of speed,the maximum oil film pressure,load carrying capacity,friction force and side leakage of both stern bearings increase to different degrees,and the friction coefficient tends to decrease in general.The study results provide a theoretical reference for the optimal design of the stern bearing structure of ships for engineering applications.
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