Research On The Static-dynamic Response For Propulsion Shaft Of A Large Container Ship In Waves

Nowadays,with the global economic integration and development of the shipping industry,in order to reduce transportation costs and improve economies of scale and energy conservation,Ship as the primary tool of water transport towards large-scale,high-speed and high-power develops continuously.As ship towards large-scale,it triggered a series of technical issues about ship performance and safety.Large ship,under the action of wave loads?load status and other factors,will produce largerhull deformation than a small ship.High power leads to the increase of shaft size and stiffness,which makes shaft become more sensitive to the effect of hull deformation.As ship is the flexible support of propulsion shaft,hull deformation oflarge ship will result in relative position changes of shaft bearing point,which will bring adverse impact to propulsion shaft alignment and vibration.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.In this paper,an 8530 TEU container ship is taken as the object of study.The main work includes the follows:(1)Based on the research of large container ships,using the finite element methodto explore the modeling theory of whole ship structural and propulsion shaft finite element model and the calculation methods of wave loads,achievedthe entire process of the whole ship finite element analysis.(2)According to the navigation environment,selected the typical working conditions and extreme conditions,calculated the wave loadswith AQWA software and researched on the method of loading wave loads automatically.(3)Applied wave loads to the finite element model of the whole ship and shaft,calculated hull elastic deformation of propulsion shaft bearing point under different conditions.Analyzed and studied hull deformation law under regular and irregular?speed and without speed waves.(4)Described the form and calculation method of propulsion shaft vibration.Establisheda finite element model of the shaft by using ANSYS software.Focusedon the effect of hull deformation?axial force?after stern tube bearing and other factors on the free vibration of shaft.The shaft vibration response was analyzed by applying different hull deformation incentives.(5)Described the shaftalignment calculation method.Used ANSYS optimization design method for shaft reasonable alignmentand straight alignment and compared the results.Analyzed the influence of hull deformation on the shaft alignment and studied shaft alignmentby considering hull deformation.