Chinese Journal of Ship Research
Ultimate strength reliability analysis of ship plates based on improved AK-MCS method
LUO Wenjun1,2,WANG Deyu*1,2 1 State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China 2 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China In view of the frequent occurrence of marine accidents caused by low ultimate bearing capacity of ships. To this end,the improved AK-MCS method is proposed for the research of the ultimate strength reliability of ship structures. The information entropy function was H introduced to perform secondary optimization on the sample points to improve the quality of the best sample points,so as to improve the accuracy and update efficiency of the Kriging model;and then the iterative stop criterion of AK-MCS was replaced by K-fold cross validation,so as to avoid over-learning and under-learning situation,thus the Kriging model is trained with fewer sample points to achieve a high degree of fitness to the limit state function. The nonlinear oscillator mathematical model is used to verify the results. The improved AK-MCS method is applied to the ultimate strength reliability study of shipboard frame.[Results]The results show that the number of calls to the finite element calculation in the improved AK-MCS method is reduced by 38% compared with the original method,and the efficiency and accuracy of the improved AK-MCS method are verified. The application results show that The calculation accuracy of this method is the highest,and the number of calls to finite element calculation is reduced by 32% compared with the original method. This verifies the applicability and efficiency of the improved AK-MCS method in the study of the ultimate strength reliability of ship plates. The improved AK-MCS method is used to research the ultimate strength reliability of ship plates and evaluate the failure probability of local structures,especially dangerous structures during actual navigation. ship plates;Kriging model;Monte Carlo sampling;limit state function;ultimate strength reliability
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