선박의 직진과 선회 시의 프로펠러 하중이 프로펠러 축 베어링에 미치는 영향

Abstract

In the beginning of the 1990’s, numerous shaft bearing damages, especially in aft stern tube bearing, were reported. The mainreasons of bearing damages were estimated that hull deflections have been increased by more flexible hulls and propeller dynamicloads have not been considered in shaft alignment. After that time, studies to take into account hull deflections in shaft alignment havebeen actively carried out, but for the latter leave much to be desired. In this study, the effects of the propeller forces on the propellershaft bearing have been investigated by estimating thrust eccentricity as reasonable as possible although some assumptions to simulateturning of ship were introduced. Three dimensional nominal wake to estimate thrust eccentricity have been calculated by using CFDanalysis and model test in the towing tank. This study presents the procedure to estimate the propeller eccentric forces and theirinfluence on the stern tube bearing for a container carrier. As a result, it has been found that the lateral propeller forces in turningcondition should be considered in shaft alignment to prevent shaft bearing damages.