| FPSO is a comprehensive large-scale offshore oil and gas production platform that integrates production control and employee life and rest.As the main workplace and living space for FPSO staff,the Living Quarter is equipped with intricate pipelines and a large number of precision instruments and equipment.When constructing a Living Quarter,adopting an overall lifting plan can improve the pre outfitting rate of the building and shorten the ship construction cycle.However,due to its thin main steel plate and large total weight,it is prone to structural deformation and cracking during lifting,which can damage the pre outfitting components;Blindly reinforcing walls in large areas can lead to excessive strength,waste of materials,reduce construction efficiency,and increase production costs.Therefore,how to optimize structural balance,ensure smooth overall lifting operations,and design a safe,reliable,and economically reasonable lifting plan is currently an important demand for shipyards.This article uses finite element simulation method to study the overall lifting structure strength of FPSO Living Quarter,and proposes a structural optimization plan,which can provide reference for the design and construction of Living Quarter.The main work content is as follows:Firstly,the overall lifting process design of the FPSO Living Quarter,the type and strength analysis method of the plate type lifting ears used for lifting,were introduced.Then,a parameterized lifting lug model was established using ABAQUS finite element software.The lifting lug strength was calculated by setting different grid types and other configurations,and the differences in results under different conditions were analyzed.To simplify the loading process and improve the efficiency of finite element analysis,a feasible simplified loading method for checking the strength of lifting lugs was obtained by comparing the simulation results of contact theory and simplified loading methods.On this basis,the suspension structure is optimized to achieve rapid selection and matching of the suspension structure size under the specified weight of the Living Quarter.Then,based on the relevant information of this FPSO Living Quarter,an overall finite element model of the Living Quarter was established in ABAQUS.An auxiliary drawing program was written in Python language to improve modeling speed.The structural stress and deformation before the lifting of the Living Quarter,at the moment of lifting and during the lifting process are calculated to identify weak areas in the structure,and improve the design to reduce the phenomenon of stress concentration.Finally,Python program parameterized modeling and ABAQUS finite element analysis were integrated into Isight software.After running the program to automatically model and calculate,explore the impact of selected component parameters on the overall lifting structure strength of the Living Quarter.The structural nodes that need to be focused on are summarized,and the multi-island genetic algorithm and adaptive simulated annealing are used in Isight to optimize the design of the original hanging structure.The comparison of structural strength performance and material usage before and after optimization proves that the optimization method is feasible and the structural optimization effect is outstanding. |
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