Study On Slamming And Optimization Of Bow And Stern Structures Of A Large Cruise Ship

Ships in bad weather will have a violent hull rocking,waves will hit the hull plate,such waves on the hull of the fierce impact phenomenon is called slamming.In the process of hull banging,instantaneous effect and strong nonlinearity of wave will occur,and the analysis of wave theory and corresponding characteristics will also be involved.These banging problems have always been one of the key research topics of shipbuilding and ocean engineering.In order to accurately predict the impact of waves on the hull in the course of sailing and consider the safety of hull structure,it is necessary to analyze the impact of waves on the hull in the process of ship design.The problem of wave bang of large cruise ships is different from that of simplified structure,partial structure of hull or conventional ship type.The main difference lies in the structural characteristics of cruise ships,such as large forward wave,superstructure and tail,etc.In this thesis,the structural design and optimization research are carried out based on the wave thud of the local structure of the bow and tail of large cruise ship under real sea conditions.First need to real working condition of ocean,the establishment of large cruise ship in the numerical simulation method of wave slamming of the sailing,get first waves beat hull and tail slamming load,and on this basis,the research on optimization of structural design and configuration for fore and aft structure,to ensure that the ship hydrodynamic performance at the same time,reduce wave slamming load and guarantee the safety of navigation of ships.The finite element model and calculation water area model of large cruise ship were established by Patran software,and the bang load prediction of ship hull in waves was established by using STAR-CCM+ CFD software,so as to obtain the bang load of ship hull in the first bang and tail bang.Based on the above technology,the bow and tail structure design based on wave bang was carried out and a reasonable optimization scheme was proposed.Thus,the wave bang load is reduced.The research contents are as follows:(1)Based on the bang experiment of the simplified structure,the numerical simulation analysis and research on the wedge’s bang load under different oblique lift angles and different entry heights were carried out,and the results were compared with the model experiment results,which verified the validity of the numerical model of the bang load prediction based on STAR-CCM+ software established in this thesis.The results provide a basis for the structural response research of large cruise ship bang load.(2)based on the design wave method to determine the major cruise wave input scene,build large cruise the numerical model of wave slamming load forecast,and to carry out the validation of numerical wave,grid,and the time step analysis,on this basis,carried out under different amplitude of ship first the tail region of the slamming load distribution characteristics and the bottom of the bow and the first double slamming phenomena of flare.(3)Taking the bow and tail structures of the hull as the research object,the response characteristics of the cruise ship were analyzed by ABAQUS software based on the obtained bow and tail thudding loads,and the structure type of the hull head was analyzed and the structural parameter variables were optimized and analyzed.At the same time,the self-fusion technology,CFD numerical method and optimization algorithm are combined to carry out the research on the design method and optimization method of cruise ship configuration,and the influence of the reconstructed ship type parameters in different bow and stern regions on the bang load is studied,so as to obtain the ship type with better bang load performance.