The Structure Strength And Node Optimization Research Of Large Container Ship

The ship structural strength is the ability of the hull structure not to be damaged or deformed by the complicated external force during normal navigation and in design service life.Structural strength analysis of ships is an indispensable part of structural design,which is the most powerful method to ensure the safety and reliability of ships.Container ship is one of the main ships of the maritime market,the structural design is different from that of conventional ships.The large opening of the deck weakens its torsional rigidity severely.With the trend of large-scale in recent years,many new features appeared in the structural design of large container ship,which bring new problems in hull structural strength subsequently.In this paper,the large container ship was selected as the object,the cabin finite element analysis method which loadscalculated by rules and the whole ship finite element analysis method which loadscalculated by design wave approach were studied.Then,a 9200 TEU container ship was selected as the target ship,the cabin finite element strength analysis was finished according to BV Classification Society.Based on software WALCS to determine the design waves and the corresponding wave loads,the use of PCL language automatically loads,and then,the finite element strength analysis of the ship was carried out.The stress distribution and stress level obtained by the two methods are close by comparing the results of the cabin analysis and the stress analysis of the whole ship.It shows that the results of the cabin analysis can well represent the stress situation of the cargo hold area.At the same time,The stress of the whole ship is relatively larger,which indicates that the method of rules is a conservative method.After the finite element analysis of the cabin and the whole ship,it was found that the stress concentration in the upper of the hull was obvious.In this paper,the most serious corner is selected to study the node optimization method to improve the corner transition stress concentration.The results show that the negative-corner structure can reduce the stress concentration to a large extent;if the thickening plate is considered,the stress concentration condition can be further improved.Based on this idea,this paper presents a ladder-shaped transition thickening formand obtainsa more satisfactory resultsthrough stress analysis.The grid size used infinite element analysis of the cabin and the whole ship is too large,so these stress concentration nodes todo refinement analysis and put the performance of the fine structure in the model to obtain more accurate stress distribution.It is found that the nodes which do not meet the requirements of the application under the finite element analysis of the cabin and the whole ship satisfy the requirements in the detailed analysis.It is shown that the high stress regions need to be calculated with higher precision to determine the true stress state of the structure.