19. Theoretical Approach of Load-distribution in Stern Tube Bearing

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There have not been any papers evaluating the load distribution in stern tube bearing, because the supporting condition and external forces, such as overhanging weights and hydro-dynamic forces of propeller, are very complicated. The authors have established a computing method to evaluate the load distribution by using the deflection curve of propeller shaft and supporting force, which were calculated by continuous beam theory applied to all over the shafting system. In this method, it was that the stern tube bearing consists of several devided pieces supported at their centers by non linear springs, respectively. As results of evaluations, which were carried out under several designing condition arranged systematically on a ship installed lignamvitae for stern tube bearings have been obtained. (1) Bearing pressure is about 25 kg/cm^2 at the after end of the stern tube bearing, taking account weight of shafting and assuming that alignment of shaft is straight. (2) When the shafting is subjected to external force and moment at the position of propeller, the bearing pressure of stern tube and deflection of shaft in stern tube show remarkable change. But the influence of the external force and moment is negligible in the vicinity of the aftermost plumber block. (3) Designing devices to incline the bearing surface along the deflction curve of shaft and to support the bearing elastically are effective to decrease the local pressure of the bearing. It is presumed that the length of stern tube bearing may be shortened by these devices.
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19. Theoretical Approach of Load-distribution in Stern Tube Bearing

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