Dynamic Characteristics Of Shaft System Of Ship Under The Interaction Of Wave And Temperature

With the development of the shipping business,large ships started to become mainstream ship designed and construction,but with the development of large-scale ships,more and more problems began to appear,which allow research institutions and major shipyard are most concerned about is the shafting dynamic factors factors due to deformation caused by the hull.Caused by deformation of the hull's dynamic many factors,which are mainly from cargos loading,temperature stress,pressure of waves on ships and so on.The deformation of ship passed through the ship's keel and ribs after deformation results bearing on the level of double bottom position changes,resulting in deformation of the shaft.Efficiency can cause deformation of the shaft after the transmitting power is reduced,increased bearing wear,shaft vibration increases,seriously affected the normal lives of the crews.This article will bulid the research model of a 8 530 TEU container ship.Then find out the vessel temperature changes in the ocean,the amount of deformation of the hull by wave pressure situations,which are basises of calculating the amount of deformation of the shaft,the shaft bend build model to study due to temperature and stress wave pressure combined effect of the dynamic characteristics of the case shafting.The main work of this paper includes the following aspects.(1)Use the finite element software to construct the corresponding ship model,and access to relevant hydrological data,find out the ship's external environment temperature data of the ship's navigation area,then study the method to load temperature load in the finite element software,and calculate the shaft deformation of the ship under certain conditions of temperature load.It found that the main effect of temperature load on the deformation of the hull comes from the difference of temperature,and the deformation trends of the shaft are the opposite under the condition of low temperature and high temperature.(2)The ship hydrodynamic model is constructed by means of Aqwa software module,according to statistical datas of waves existing in the North Atlantic and Pacific navigation area,select 7.5 m and 11.5 m height calculated the two conditions of wave height under different wave phases of hull deformation.Finally,it is concluded that various wave pressure force shaft deformation data.Finally,the calculation results show that the larger the wave height,the larger the deformation of the shaft,the deformation of the bearing with the wave phase is a Sine variation trend.(3)In front of the finite element software simulation of hull deformation data calculated from temperature stress and stress-induced waves,based on the case studies in the interaction between the two cases in which the craft straight shaft alignment,and calculate the corresponding case under reaction forces.From the results,the support reactoion forces of rear end bearing and the main engine bearing are largest.(4)Through the data in the previous research of straight shaft alignments,built shaft deformation the finite element models corresponding to the different external conditions and the initial state of the straight shaft of the finite element model and analysis calculation of shafting transverse vibrations and torsional vibrations calculation methods and the corresponding constraint boundary conditions,and direct axis and each curve calculated in ANSYS software axis model of vibration frequency,and analysis under the combined action of temperature and pressure wave conditions,because of the hull deformation caused shaft deformation,found that the natural frequency of vibration of the shafting in deformation conditions,there is a decreasing trend.