The Research On Alignment Of Marine Propulsion Shaft System

Shaft system is very important composing part in propeller system of marine, the function of shaft system is transferring power and impulse. Shaft system of low quality alignment can cause burning of bearing, damage of bearing, leak of packing unit and gear of gearbox matching badly, lower degree of noise and vibration easily, affect security during marine sail. In order to ensure that shaft system can be worked continuously, shaft system is required to arrange under reasonable state by definite request and method, bearing load of all bearing and stress of each shaft on shaft system is in its permitted range and at its best under each condition.In this paper, the research on alignment of shaft system is carried basing on propeller shaft system of some marine. It have different distortion date and stress of shaft system under each condition. Thus, after forming initial project of shaft system, it needs to be calculated on shaft system to ensure that shaft system can be worked in reasonable range under each condition. In this paper, the study includes condition of shaft system when ship is on berth or water; cold and hot state of shaft system; effect of alignment of shaft system by rigidity of bearing oil film; effect of alignment of shaft system by distortion of ship hull; contact model of screw shaft; effect of shaft system working by bearing abrasion.Shaft section is supported by bearings, but shaft section is supported by bearing oil film when shaft system is worked. Because of its weight and other factor of shaft section, between the bearing support is tilted. Bearing reaction and working of shaft is affect by bearing oil film thickness, bearing oil film rigidity and shaft section tilt, it need to more comprehensive consideration during alignment analysis of shaft system.Based on these studies, on the one hand, it obtain the relevant information of alignment of shaft system and provide date for the preparation of process documentation in shipyard; on the other hand, it is a summary of relevant method of alignment calculation of shaft system, to provide reference of alignment of shaft system for other ships.