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

【摘要】：液體載運(yùn)設(shè)備或內(nèi)部有液艙結(jié)構(gòu)的載運(yùn)設(shè)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(yīng)用,大型低溫液體載運(yùn)設(shè)備的需求量增大。在船舶與海洋工程領(lǐng)域內(nèi),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(yùn)設(shè)備。船體所在特殊環(huán)境決定了其會(huì)受到外界風(fēng)、浪、流的作用產(chǎn)生六個(gè)自由度的響應(yīng),進(jìn)而引起船體內(nèi)部低溫液艙內(nèi)的低溫液體的晃蕩�；问幒奢d會(huì)影響液艙結(jié)構(gòu)安全、船體運(yùn)動(dòng)姿態(tài)以及船體穩(wěn)性,是決定LNG和FLNG安全性的關(guān)鍵因素。因此分析液艙晃蕩現(xiàn)象,評(píng)估晃蕩荷載并在LNG和FLNG的設(shè)計(jì)過(guò)程中降低晃蕩荷載是當(dāng)今船舶與海洋工程領(lǐng)域內(nèi)一個(gè)比較重要的問(wèn)題。為了能夠?qū)?fù)雜液艙在復(fù)雜激勵(lì)或真實(shí)激勵(lì)下的晃蕩荷載研究提供依據(jù)并提高研究結(jié)果的可信度,本文利用模型試驗(yàn)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(duì)簡(jiǎn)化模型——二維矩形液艙在船體常見(jiàn)響應(yīng)類型——橫搖的簡(jiǎn)諧激勵(lì)下的晃蕩荷載進(jìn)行對(duì)比研究。從機(jī)理上分析對(duì)比兩種方法得到的晃蕩荷載的一些基本特性。通過(guò)分析對(duì)比兩種方法的結(jié)果的一致性來(lái)驗(yàn)證兩種方法的可信度,總結(jié)兩種方法的結(jié)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(jìn)措施。結(jié)合兩種方法的結(jié)果總結(jié)得到二維矩形艙內(nèi)液體在橫搖激勵(lì)下的晃蕩荷載的空間分布、受橫搖激勵(lì)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(fù)雜液艙晃蕩荷載的研究打下基礎(chǔ)。并將結(jié)果應(yīng)用在液艙設(shè)計(jì)乃至LNG和FLNG的整體設(shè)計(jì)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(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U661.7;U674.133.3

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