【摘要】：由于在營(yíng)運(yùn)周期和經(jīng)濟(jì)性方面的優(yōu)勢(shì)，江海直達(dá)船結(jié)構(gòu)優(yōu)化設(shè)計(jì)成為目前船舶研究中的熱點(diǎn)。文章通過(guò)對(duì)船體極限強(qiáng)度和船體結(jié)構(gòu)優(yōu)化機(jī)理及實(shí)施方法的回顧與探討，以江海直達(dá)船中剖面結(jié)構(gòu)最輕化為目標(biāo)，在滿足《江海通航船舶建造規(guī)范》條件下，使用目前成熟的優(yōu)化設(shè)計(jì)平臺(tái)，對(duì)適用于基于江海直達(dá)船極限承載能力的結(jié)構(gòu)優(yōu)化問(wèn)題的優(yōu)化策略及實(shí)現(xiàn)進(jìn)行了研究。研究?jī)?nèi)容及成果如下： （1）通過(guò)對(duì)極限強(qiáng)度計(jì)算方法的研究，文章確定所采用的極限強(qiáng)度計(jì)算方法為簡(jiǎn)化計(jì)算方法和非線性有限元方法，并詳細(xì)介紹了簡(jiǎn)化計(jì)算方法的計(jì)算過(guò)程；根據(jù)船舶結(jié)構(gòu)優(yōu)化特點(diǎn)及已有優(yōu)化研究成果，文章選擇模擬退火算法作為優(yōu)化算法，利用優(yōu)化設(shè)計(jì)平臺(tái)Isight建立優(yōu)化模型并進(jìn)行計(jì)算及分析。 （2）根據(jù)極限強(qiáng)度簡(jiǎn)化計(jì)算方法原理，使用Fortran語(yǔ)言編制極限強(qiáng)度簡(jiǎn)化計(jì)算程序。使用簡(jiǎn)化計(jì)算程序?qū)咏畎鍐卧M(jìn)行影響因素分析，通過(guò)對(duì)不同試驗(yàn)設(shè)計(jì)方法原理及計(jì)算結(jié)果比較，確定采用優(yōu)化拉丁超立方方法進(jìn)行試驗(yàn)采樣進(jìn)而進(jìn)行靈敏度研究；對(duì)江海直達(dá)船中剖面結(jié)構(gòu)因素進(jìn)行分析并結(jié)合對(duì)加筋板單元影響因素研究成果，，確立中剖面結(jié)構(gòu)優(yōu)化設(shè)計(jì)變量、約束及目標(biāo)，對(duì)中剖面結(jié)構(gòu)進(jìn)行了靈敏度計(jì)算分析并根據(jù)靈敏度結(jié)果剔除部分設(shè)計(jì)變量后進(jìn)行了初步優(yōu)化計(jì)算。 （3）利用非線性有限元軟件Abaqus提供的二次開(kāi)發(fā)腳本接口，使用Python語(yǔ)言，依托參數(shù)化思想建立江海直達(dá)船中剖面結(jié)構(gòu)有限元參數(shù)化建模及計(jì)算模型；結(jié)合前文研究成果確定本文通過(guò)試驗(yàn)設(shè)計(jì)建立近似模型進(jìn)而對(duì)近似模型進(jìn)行優(yōu)化計(jì)算的優(yōu)化策略；建立基于近似模型的中剖面結(jié)構(gòu)優(yōu)化模型并進(jìn)行優(yōu)化計(jì)算；對(duì)優(yōu)化結(jié)果整理驗(yàn)證并最終確定基于極限承載能力的江海直達(dá)船中剖面優(yōu)化結(jié)構(gòu)。
[Abstract]:Because of its advantages in operation cycle and economy, the optimal design of river and sea direct ship structure has become a hot spot in ship research. Based on the review and discussion of the ultimate strength of the ship and the optimization mechanism of the hull structure as well as the implementation method, this paper takes the minimum section structure of the river and sea direct ship as the objective, under the condition of meeting the requirements of the ship construction code for the navigation of the river and sea. Based on the mature optimal design platform, the optimization strategy and implementation of the structural optimization problem based on the ultimate load-carrying capacity of river-sea direct ships are studied. The research contents and results are as follows: (1) through the study of the ultimate strength calculation method, the paper determines that the calculation method is simplified method and nonlinear finite element method. The calculation process of simplified calculation method is introduced in detail, and according to the characteristics of ship structure optimization and the research results of existing optimization, the simulated annealing algorithm is selected as the optimization algorithm. The optimization model is established by using Isight platform. (2) according to the principle of simplified calculation method of limit strength, the simplified calculation program of limit strength is compiled by Fortran language. The simplified calculation program is used to analyze the influence factors of the stiffened plate element. By comparing the principle of different experimental design methods and the calculation results, the optimized Latin hypercube method is adopted to sample the test and the sensitivity is studied. Based on the analysis of the structural factors of the middle section of the river and sea direct ship and the results of the research on the influence factors of the stiffened plate element, the variables, constraints and objectives of the optimum design of the middle section structure are established. The sensitivity analysis of the middle section structure is carried out and some design variables are eliminated according to the sensitivity results. (3) the secondary development script interface provided by the nonlinear finite element software Abaqus is used in Python language. Based on the idea of parameterization, the finite element parameterized modeling and calculation model of the cross-section structure of the river and sea direct ship is established, and the optimization strategy of the approximate model is established by the experimental design and the optimization calculation of the approximate model by combining the previous research results. The optimization model of middle section structure based on approximate model is established and optimized calculation is carried out, and the optimized structure of middle section of river and sea direct ship based on ultimate load-bearing capacity is confirmed and verified by the result of optimization.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U661.4

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