RESEARCH ON LARGE-SCALE MARINE PROPULSION SHAFTING LOAD TEST AND ADJUSTMENT TECHNOLOGY

摘要

Power shaft is an important component which transmits power from the engine to the propeller in ship power system. Currently, because the sizes of cargo ships become bigger and bigger, the sizes of the power shafts increase. During the installment of shafting, a very important step is making the bearing loads meet the requirements of shafting alignment manual. The Traditional method is just measuring the bearing loads repeatedly and gradually adjusting the bearing displacement by worker’s experience. The repeating measurements and adjustments takes a lot of time and the results are not accurate enough, especially for large power shaft. It can lead to high temperature of bearing, tile kilning and ship outage during navigating, which will bring huge economic losses. So a more reliable and accurate adjusting method is very necessary. This paper firstly investigates marine propulsion shafting load test method, improves the jack-up method and strain-gage method respectively, and increases the precision of bearing load measurement. On this basis, this paper studies bearing displacement adjustment calculation method, calculates bearing load influence factors which take bearing stiffness into account, establishes special nonlinear optimization model with absolute values symbol, and establishes bearing displacement adjustment algorithms. Finally, by applying data of several ships, the bearing load measurement method and adjustment techniques promoted by this paper are verified. The result shows that they are able to meet the requirements of actual construction technology.