A Study On The Dynamic-static Features For Propulsion Shaft Of Large-scale Container Ship In Waves

The blossoming marine transportation and global economic integration promote the enlargement of ships.Container ship is one of the most popular modes of transportation,its enlarging principle dimension and high power of main engines improve the enlargement and slenderness of the propulsion shafts.Large-scale ships would deform under the influence of shipment and wave load.The deformation would lead to the changes of the bearings’ relative position and bearing load.The problems caused by hull deformation,such as the failure of neutral,intensified shaft vibration,large stern shaft deflection and bearing load,and so on,become a hot research topic in the field of ship and marine engineering.8530TEU container ship was taken as an object of the following study for the features of propulsion shaft in waves:(1)Based on the study of large-scale container ship,the finite element method was adopted for the finite element model of the whole ship and the shafts only.The calculation of wave loads was also discussed to complete the finite element study of the container ship.(2)According to the shipping environment,typical condition was selected.With the aid of AQWA,the wave load was calculated and the automatic loading by APDL(ANSYS Parametric Design Language)was achieved.(3)The wave load was loaded on ship-shaft finite element model.And the elastic deformation of ship hull under different condition was calculated.The regular patterns of deformation under regular and irregular waves were mainly analyzed.(4)Bearing load measurement method of the actual ship in experiment was introduced.The errors between experiment measurement data and finite element calculation data were analyzed.And the reliability of the numerical calculation was validated.(5)The method of shaft alignment calculation that assisted with MATLAB was introduced.This method was based on linear programming.(6)The calculation of straight alignment and rational alignment were compared.The results of alignment in static water and in waves were also compared.The influence of deformation in waves on the shaft alignment is analyzed.