本文選題：LNG + 上層建筑��； 參考：《江蘇科技大學》2015年碩士論文

【摘要】：隨著船舶大型化的發(fā)展,上層建筑作為一個獨立的分段,結(jié)構(gòu)重量及外形尺寸都越來越大。為了適應(yīng)高效造船的需求,上層建筑的預(yù)舾裝率越來越高,吊裝方式也從之前的分體吊裝發(fā)展為如今的整體吊裝。整體吊裝作為一種更加高效的吊裝方式,對上層建筑結(jié)構(gòu)強度也提出了更高的要求。LNG船是國際公認的高技術(shù)、高難度、高附加值的“三高”產(chǎn)品,LNG船是在零下162攝氏度低溫下運輸液化氣的專用船舶,是一種“海上超級冷凍車”,被喻為世界造船“皇冠上的明珠”。因此,相比于普通船舶,LNG船上層建筑對舾裝率要求更高,在吊裝過程中需要更嚴格地控制結(jié)構(gòu)變形。本文以一艘大型LNG船上層建筑為研究對象,分析了在吊裝方案設(shè)計、吊耳結(jié)構(gòu)分析、吊裝強度校核以及動載荷系數(shù)確定等幾個過程中的的關(guān)鍵問題。為實際工程應(yīng)用提供了理論依據(jù),對上層建筑吊裝有限元模擬具有很大參考價值。本文主要內(nèi)容分為以下幾點:(1)闡述了上層建筑整體吊裝強度分析方法的發(fā)展歷程,介紹了吊耳結(jié)構(gòu)強度的分析方法。(2)介紹了普通吊耳的結(jié)構(gòu)形式與規(guī)格,以及國內(nèi)外企業(yè)的吊耳結(jié)構(gòu)形式,分析了不同因素限制下整體多孔吊耳的結(jié)構(gòu)響應(yīng)特點。(3)利用有限元軟件MSC.Patran建立了LNG上層建筑整體有限元模型,分析了上層建筑在起吊前以及平穩(wěn)起吊過程中的結(jié)構(gòu)應(yīng)力與位移,確定了模型的高應(yīng)力區(qū)域,對應(yīng)力以及變形過大的區(qū)域進行了結(jié)構(gòu)加強措施并通過計算驗證了加強方案的可行性。(4)上層建筑吊裝過程中動載荷系數(shù)的研究。利用MD/Nastran中瞬態(tài)響應(yīng)分析功能,在四種不同吊機加速曲線下,對起吊瞬間上層建筑的運動形態(tài)進行了模擬,精確地得到了沖擊載荷對上建結(jié)構(gòu)的影響,通過結(jié)果的對比驗證了現(xiàn)有動載荷系數(shù)的可靠性。
[Abstract]:With the development of large-scale ship, superstructure as an independent segment, the structure weight and shape size are increasing. In order to meet the demand of efficient shipbuilding, the pre-outfitting rate of superstructure is higher and higher. As a more efficient hoisting method, the integral hoisting has put forward higher requirements for the structural strength of superstructure. LNG carriers are internationally recognized as high technology and difficult. The high value-added "Sangao" product LNG carrier is a special vessel for transporting liquefied gas at minus 162 degrees Celsius. It is a kind of "marine super refrigerating vehicle", which is called the "pearl on the crown" of the world shipbuilding. Therefore, the outfitting rate of LNG ship superstructure is higher than that of ordinary ship, and the deformation of the structure should be controlled more strictly in the process of hoisting. Taking the superstructure of a large LNG carrier as the research object, this paper analyzes the key problems in the design of hoisting scheme, the analysis of hoisting structure, the checking of hoisting strength and the determination of dynamic load coefficient. It provides theoretical basis for practical engineering application and has great reference value for finite element simulation of superstructure hoisting. The main contents of this paper are as follows: (1) the development course of the analysis method of the integral lifting strength of superstructure is described, and the analysis method of the strength of the lifting lug structure is introduced. (2) the structural form and specifications of the ordinary hoisting lugs are introduced. The structural response characteristics of the whole porous hoist under different factors are analyzed. (3) the integral finite element model of LNG superstructure is established by using the finite element software MSC.Patran. The structural stress and displacement of superstructure before lifting and during stationary lifting are analyzed, and the high stress region of the model is determined. The structural strengthening measures are carried out for the areas with excessive stress and deformation and the feasibility of the strengthening scheme is verified by calculation. (4) the dynamic load coefficient in the process of superstructure hoisting is studied. Using the transient response analysis function in MD-Nastran, under four kinds of acceleration curves of crane, the motion pattern of superstructure in the moment of lifting is simulated, and the influence of impact load on the superstructure is obtained accurately. The reliability of the existing dynamic load coefficient is verified by comparing the results.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U674.133.3

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