선박 추진축계 선미관 베어링 유막해석에 관한 연구

Abstract

프로펠러 무게의 영향을 받는 선박 추진축계 선미관 베어링의 윤활 상태 파악을 위해 회전수와 하중 작용 위치에 따른 선미관 베어링의 유막 해석을 해 보았다.

유체역학적 이론을 통해 지배 방정식을 세운 후, ANSYS, MathCAD 등의 프로그램을 이용하여 하중분포 상태 및 회전에 따른 윤활 상태를 계산하였다.

The propeller for propelling a ship is installed at the stern side end of propeller shaft protruding from its stern. Therefore the propeller shaft is deflected by the propeller weight or any external force and the stern side of stern tube bearing will be loaded larger load than its bow side end. This one-side load tends to cause local contact between the shaft and bearing and causes bearing such as wear, burning, etc. of bearing metal.

In this study, to clarify the performance of the stern tube bearing, Reynolds equation under deflected condition is solved by using computer. Oil-film pressure distribution and variation of the bearing are also calculated. And the shaft declination within the stern bearing is expressed by declination curve obtained from the deflection calculations for the entire shafting system, calculated simultaneously with the stern tube bearing by ANSYS software. Oil film characteristics are obtained, based on the finite width hydrodynamic theory and solved through the convergence calculations.