本文選題：船體變形 + 波浪載荷��； 參考：《武漢理工大學》2014年碩士論文

【摘要】：船舶推進軸系是船舶動力系統(tǒng)的重要組成部分，與船舶航行的安全性和可靠性直接相關。在船舶服役期間，，推進軸系的運行狀態(tài)受到船體變形、螺旋槳水動力、潤滑油膜等多種因素的共同影響。其中，過大的船體變形會使軸系原有的校中狀態(tài)不復存在，并且影響軸系的動力特性，導致推進軸系的工作效率與使用壽命雙雙降低。 近年來，隨著全球經(jīng)濟的迅速發(fā)展，國際貿易越來越頻繁，貨運需求急劇增長，集裝箱船、油船等主力船型的規(guī)模與技術參數(shù)不斷增大，一些關鍵性問題也日益突出。在船舶動力系統(tǒng)方面，船舶的大型化導致了船體局部剛度相對變弱，船體變形顯著增大，其對推進軸系的影響也越來越嚴重。特別是航行在波浪中的船體，受到波浪載荷的作用，其變形可能比靜水中幅度更大變化更劇烈。然而，目前船舶的軸系校中計算一般不考慮支座處的船體變形，以此作為軸系安裝施工的依據(jù)顯然不夠合理，軸系校中技術需要重新審視并有所改進。 所以，針對船體結構與推進軸系，系統(tǒng)地計算各種海況下的船體變形并提出一套合理而準確的預報方法是本文的研究重點。 本文以一條大型集裝箱船和一條大型油船為研究對象，主要做了如下工作： (1)利用通用有限元軟件ANSYS，建立了全船結構有限元模型及船軸一體模型； (2)利用水動力分析程序AQWA計算了計及水動效應影響的波浪載荷，并施加于船體結構有限元模型； (3)確定了空載、壓載、滿載三種基本工況，計算了不同海況下船舶軸系支座處的船體變形，并對有無軸系的計算結果進行了對比分析。 本文研究表明，軸系支座處的船體變形在各種工況下呈現(xiàn)一定的規(guī)律，其對推進軸系的影響不可忽視。本文計算結果為軸系校中工藝的改進提供了詳實的數(shù)據(jù)，所得船體變形曲線的形狀和大小可以作為同類及相似船型船體變形估測的參考。
[Abstract]:Ship propulsion shafting is an important part of ship power system, which is directly related to the safety and reliability of ship navigation. During the service of the ship, the operating state of the propulsion shafting is affected by many factors, such as hull deformation, propeller hydrodynamic force, lubricating oil film and so on. Among them, the excessive hull deformation will make the original alignment state of shafting no longer exist, and affect the dynamic characteristics of shafting, resulting in the reduction of working efficiency and service life of propelling shafting. In recent years, with the rapid development of global economy, International trade is becoming more and more frequent, the demand for freight is increasing rapidly, the scale and technical parameters of the main ship types such as container ships and oil tankers are increasing, and some key problems are becoming increasingly prominent. In the aspect of ship power system, the large scale of ship leads to the relative weakening of the local stiffness of the hull, the increase of the hull deformation, and the more and more serious influence on the propulsion shafting. Especially the ship which navigates in the wave is subjected to the wave load and its deformation may be more severe than that in the static water. However, at present, the ship's shafting alignment calculation generally does not consider the hull deformation at the support, which is obviously not reasonable as the basis for shafting installation and construction, and the shafting alignment technology needs to be re-examined and improved. Aiming at the hull structure and propulsion shafting, it is the key point of this paper to systematically calculate the hull deformation under various sea conditions and to put forward a set of reasonable and accurate forecasting methods. In this paper, a large container ship and a large oil tanker are taken as the research objects. The main works are as follows: (1) the finite element model of the whole ship structure and the ship shaft integral model are established by using the universal finite element software ANSYS2) the wave load considering the effect of hydrodynamic effect is calculated by using the hydrodynamic analysis program AQWA. And applied to the finite element model of ship hull structure. (3) three basic working conditions of no-load, ballast and full load are determined, and the hull deformation of shafting support of ship under different sea conditions is calculated. In this paper, it is shown that the hull deformation at shafting supports presents certain rules under various working conditions, and its influence on propulsion shafting should not be ignored. The calculated results provide detailed data for the improvement of shafting alignment process. The shape and size of the hull deformation curves obtained can be used as a reference for the estimation of hull deformation of similar and similar ship types.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U661.32;U664.21

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本文編號：2009421