本文選題：勢(shì)流理論　切入點(diǎn)：液艙晃蕩　出處：《浙江海洋大學(xué)》2016年碩士論文

【摘要】：海洋油氣資源開(kāi)采和運(yùn)輸量日益增加,且液貨船具備運(yùn)輸效率高效而運(yùn)輸費(fèi)用較低的優(yōu)勢(shì),當(dāng)前國(guó)際市場(chǎng)對(duì)液貨船的需求也日益增長(zhǎng)。液貨船具有寬度較大、裝載深度高的特性,在一定頻率范圍的波浪作用下,船體運(yùn)動(dòng)會(huì)導(dǎo)致劇烈的液艙晃蕩,而晃蕩載荷對(duì)船體結(jié)構(gòu)和運(yùn)動(dòng)響應(yīng)都將造成重大影響,進(jìn)而影響液貨船在運(yùn)營(yíng)中的效率和安全性。因此,在液貨船設(shè)計(jì)階段,有效預(yù)報(bào)液貨船與液艙晃蕩的耦合運(yùn)動(dòng),開(kāi)展考慮液貨晃蕩影響的結(jié)構(gòu)強(qiáng)度評(píng)估,具有重要的應(yīng)用價(jià)值。論文研究工作主要包括以下幾部分。(1)基本原理與數(shù)值模擬方法研究�；趧�(shì)流理論,將船殼外面以及液艙內(nèi)表面統(tǒng)一生成濕表面,對(duì)液貨船內(nèi)外流場(chǎng)統(tǒng)一進(jìn)行線性頻域面元法計(jì)算,把晃蕩載荷影響轉(zhuǎn)化為運(yùn)動(dòng)方程中的附加質(zhì)量項(xiàng)進(jìn)行考慮。通過(guò)以荷蘭MARINE實(shí)驗(yàn)室完成的FPSO實(shí)驗(yàn)為算例,數(shù)值模擬了不同浪向不同裝載工況下液艙與船體耦合運(yùn)動(dòng),驗(yàn)證本文的數(shù)值方法的計(jì)算精度和計(jì)算效率。(2)考慮晃蕩影響液貨船的水動(dòng)力運(yùn)動(dòng)規(guī)律研究。針對(duì)11000DWT液貨船,數(shù)值模擬了不同載液率、不同浪向角和不同縱艙壁形式下是否考慮液艙晃蕩載荷的液貨船運(yùn)動(dòng)。對(duì)比研究了有無(wú)晃蕩載荷對(duì)液貨船運(yùn)動(dòng)響應(yīng)影響以及不同的裝載率對(duì)液貨船運(yùn)動(dòng)響應(yīng)的影響。(3)考慮晃蕩影響液貨船的結(jié)構(gòu)強(qiáng)度評(píng)估研究。對(duì)11000DWT液貨船開(kāi)展了波浪誘導(dǎo)載荷的長(zhǎng)期預(yù)報(bào),并采用設(shè)計(jì)波法研究了有無(wú)液貨晃蕩載荷的整船結(jié)構(gòu)響應(yīng),研究了液艙晃蕩載荷對(duì)液艙結(jié)構(gòu)響應(yīng)的影響規(guī)律。采用譜分析法對(duì)船中貨艙典型節(jié)點(diǎn)進(jìn)行疲勞損傷預(yù)報(bào),研究了液艙晃蕩載荷對(duì)液艙結(jié)構(gòu)疲勞強(qiáng)度的影響規(guī)律。
[Abstract]:The exploitation and transportation of offshore oil and gas resources are increasing day by day, and the tanker has the advantages of high efficiency and low transportation cost, so the demand for tankers in the international market is increasing day by day.The tanker has the characteristics of large width and high loading depth. Under the action of waves in a certain frequency range, the ship sports will cause violent sloshing of the tank, and the sloshing load will have a significant impact on the structure and the response of the ship's motion.Furthermore, the efficiency and safety of tankers in operation are affected.Therefore, in the design stage of tankers, it is of great value to effectively forecast the coupling motion of tankers and tank sloshing and to carry out structural strength evaluation considering the influence of liquid cargo sloshing.The research work mainly includes the following parts: 1) basic principle and numerical simulation method.Based on the potential flow theory, the wet surface is uniformly generated from the outside of the ship's shell and the inner surface of the tank, and the uniform flow field inside and outside the tanker is calculated by the linear frequency-domain panel method, and the influence of the sloshing load is transformed into the additional mass term in the motion equation.The coupled motion of tank and hull under different wave directions and different loading conditions is numerically simulated by taking the FPSO experiment completed by MARINE Laboratory in the Netherlands as an example.The computational accuracy and efficiency of the numerical method in this paper are verified. (2) the hydrodynamic motion of tankers considering the influence of sloshing on the hydrodynamic motion is studied.For 11000DWT tankers, the motion of tankers with different liquid loading rates, different wave angles and different longitudinal bulkheads is numerically simulated.The effects of sloshing load on the dynamic response of tankers and the effects of different loading rates on the response of tankers are compared. 3) the structural strength evaluation of tankers considering the influence of sloshing on the structural strength of tankers is studied.The long-term prediction of wave-induced loads on 11000DWT tankers is carried out, and the structural response of the whole ship with or without liquid sloshing load is studied by design wave method, and the influence of tank sloshing loads on the structural responses of tanks is studied.In this paper, the fatigue damage prediction of typical nodes of cargo tank is carried out by spectrum analysis, and the influence of tank sloshing load on fatigue strength of tank structure is studied.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U674.133

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本文編號(hào)：1726443