本文選題：二維矩形艙　切入點：橫搖　出處：《大連理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：液體載運設備或內部有液艙結構的載運設備逐步走向大型化,尤其是隨著天然氣等氣體能源的廣泛應用,大型低溫液體載運設備的需求量增大。在船舶與海洋工程領域內,液化天然氣船(LNG, Liquid Natural Gas)和浮式液化天然氣船(FLNG, Floating Liquid Natural Gas)是兩大代表性的用于裝載低溫液體的載運設備。船體所在特殊環(huán)境決定了其會受到外界風、浪、流的作用產(chǎn)生六個自由度的響應,進而引起船體內部低溫液艙內的低溫液體的晃蕩。晃蕩荷載會影響液艙結構安全、船體運動姿態(tài)以及船體穩(wěn)性,是決定LNG和FLNG安全性的關鍵因素。因此分析液艙晃蕩現(xiàn)象,評估晃蕩荷載并在LNG和FLNG的設計過程中降低晃蕩荷載是當今船舶與海洋工程領域內一個比較重要的問題。為了能夠對復雜液艙在復雜激勵或真實激勵下的晃蕩荷載研究提供依據(jù)并提高研究結果的可信度,本文利用模型試驗和數(shù)值模擬兩種晃蕩荷載常用研究方法在相同的條件下對簡化模型——二維矩形液艙在船體常見響應類型——橫搖的簡諧激勵下的晃蕩荷載進行對比研究。從機理上分析對比兩種方法得到的晃蕩荷載的一些基本特性。通過分析對比兩種方法的結果的一致性來驗證兩種方法的可信度,總結兩種方法的結果之間的差別以及產(chǎn)生出入的原因,提出提高兩種研究晃蕩荷載的方法的改進措施。結合兩種方法的結果總結得到二維矩形艙內液體在橫搖激勵下的晃蕩荷載的空間分布、受橫搖激勵頻率和幅值的影響以及受載液水平的影響規(guī)律。為今后的復雜液艙晃蕩荷載的研究打下基礎。并將結果應用在液艙設計乃至LNG和FLNG的整體設計上。
[Abstract]:Liquid carrying equipment or carrying equipment with internal tank structure is gradually moving towards large scale, especially with the wide application of gas energy such as natural gas, the demand of large cryogenic liquid carrying equipment is increasing. In the field of ship and ocean engineering, LNG (Liquid Natural Gas) and floating LNG (Floating Liquid Natural Gas) are two typical carrier equipment for loading cryogenic liquids. The special conditions of the ship's hull make it subject to external wind and waves. The effect of the flow produces a response of six degrees of freedom, and then causes the sloshing of the cryogenic liquid in the cryogenic tank inside the hull. The sloshing load will affect the structural safety of the tank, the motion attitude of the hull and the stability of the hull. Is the key factor to determine the safety of LNG and FLNG. Evaluating the sloshing load and reducing the sloshing load in the design process of LNG and FLNG is an important problem in the field of ship and ocean engineering nowadays. To provide the basis for and increase the credibility of the results of the study, In this paper, two common research methods of sloshing load, model test and numerical simulation, are used to study the sloshing load of simplified model-two-dimensional rectangular tank under the simple harmonic excitation of the common response type of ship hull under the same conditions. Comparative study. Some basic characteristics of the sloshing load obtained by the two methods are analyzed and compared in mechanism. The reliability of the two methods is verified by analyzing the consistency of the results of the two methods. Summarizing the differences between the results of the two methods and the reasons for the discrepancies, Two improved methods to study sloshing load are put forward, and the spatial distribution of sloshing load of liquid in two-dimensional rectangular tank under rolling excitation is summarized by combining the results of the two methods. Under the influence of rolling excitation frequency and amplitude, as well as the influence law of loaded liquid level, this paper lays a foundation for the future study of complex tank sloshing load, and applies the results to the tank design and even to the overall design of LNG and FLNG.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U661.7;U674.133.3

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