【摘要】：隨著工業(yè)化的發(fā)展,人類對(duì)油氣資源的需求不斷增長(zhǎng),陸上和近海石油資源的減少,促使人類更加關(guān)注深海資源的勘探和開采。由于水深增加,傳統(tǒng)的重力式平臺(tái)和導(dǎo)管架平臺(tái)由于自身造價(jià)大幅度提高而不再適用,因此適合于深海作業(yè)的海洋平臺(tái)成為研究的熱點(diǎn)。目前,適用于深海鉆采的平臺(tái)類型主要有立柱式平臺(tái)(Spar)、張力腿平臺(tái)(TLP)和半潛式平臺(tái)(SEMI)。半潛式平臺(tái)由于具有更大的甲板空間和可變載荷、更大的作業(yè)水深范圍、更強(qiáng)的鉆采能力和總投資相對(duì)較小等優(yōu)點(diǎn),將是滿足我國(guó)對(duì)南海油氣資源開采要求的最佳平臺(tái)類型。本文圍繞半潛式平臺(tái),開展水動(dòng)力性能分析與多目標(biāo)優(yōu)化設(shè)計(jì)。 半潛式平臺(tái)水動(dòng)力性能分析。以三維勢(shì)流理論為基礎(chǔ),在我國(guó)南海十年一遇的海況下,通過水動(dòng)力學(xué)軟件AQWA對(duì)一座水深為1500m的深水半潛式平臺(tái)進(jìn)行了運(yùn)動(dòng)性能分析。首先,建立了半潛式平臺(tái)的水動(dòng)力模型,計(jì)算得到平臺(tái)的附加質(zhì)量、附加阻尼和RAO等水動(dòng)力參數(shù),然后在我國(guó)南海十年一遇的海況下,分別在頻域和時(shí)域?qū)ζ脚_(tái)的運(yùn)動(dòng)性能進(jìn)行了數(shù)值模擬,最后對(duì)二者結(jié)果進(jìn)行了對(duì)比,發(fā)現(xiàn)在頻域計(jì)算和在時(shí)域計(jì)算得到的平臺(tái)的縱蕩和橫蕩的計(jì)算結(jié)果相差較大,垂蕩、橫搖和縱搖的計(jì)算結(jié)果較為吻合,經(jīng)分析發(fā)現(xiàn)兩種計(jì)算方法得出不一樣的結(jié)果主要是由于波浪低頻力的影響。 半潛式平臺(tái)水動(dòng)力性能與造價(jià)的多目標(biāo)優(yōu)化設(shè)計(jì)。為了降低半潛式平臺(tái)的垂蕩響應(yīng)和建造成本,根據(jù)已有的半潛式平臺(tái)的數(shù)據(jù)確定了平臺(tái)主尺度的變化范圍,通過最優(yōu)拉丁超立方抽樣方法選取了20組樣本點(diǎn),采用徑向基代理模型對(duì)平臺(tái)的垂蕩、橫搖、氣隙和穩(wěn)性進(jìn)行了函數(shù)擬合。通過優(yōu)化軟件Isight,以平臺(tái)的垂蕩響應(yīng)和建造成本為目標(biāo),氣隙、橫搖、穩(wěn)性等為約束條件,對(duì)平臺(tái)的主尺度進(jìn)行優(yōu)化,得到了優(yōu)化問題的Pareto解集。 本文對(duì)半潛式平臺(tái)的水動(dòng)力性能及其優(yōu)化設(shè)計(jì)方法的研究結(jié)果,對(duì)半潛式平臺(tái)的概念設(shè)計(jì)階段具有參考意義。
[Abstract]:With the development of industrialization, the increasing demand for oil and gas resources, and the decrease of onshore and offshore oil resources, urge people to pay more attention to the exploration and exploitation of deep-sea resources. Because of the increase of water depth, the traditional gravity platform and jacket platform are no longer suitable for the deep sea operation due to their high cost, so the offshore platform suitable for deep-sea operation has become a hot research topic. At present, the main types of platforms suitable for deep-sea drilling and production are column type platform (Spar), tension leg platform (TLP) and semi-submersible platform (SEMI). The semi-submersible platform has the advantages of larger deck space, variable load, larger water depth range, stronger drilling and production capacity and lower total investment, etc. It will be the best platform type to meet the requirements of oil and gas exploitation in the South China Sea. In this paper, hydrodynamic performance analysis and multi-objective optimization design are carried out around semi-submersible platform. Hydrodynamic performance analysis of semi-submersible platform. Based on the theory of three-dimensional potential flow, the motion performance of a deep-water semi-submersible platform with a depth of 1500m was analyzed by using the hydrodynamic software AQWA under the once-in-a-decade sea conditions in the South China Sea. Firstly, the hydrodynamic model of semi-submersible platform is established, and the additional mass, damping and RAO parameters of the platform are calculated. The motion performance of the platform is numerically simulated in frequency domain and time domain respectively. Finally, the results are compared. It is found that the calculated results of longitudinal and transverse motion of platform in frequency domain and in time domain are quite different. The results of rolling and pitching are in good agreement with each other. It is found that the difference between the two methods is mainly due to the influence of low-frequency wave forces. Multi-objective optimization design of hydrodynamic performance and cost of semi-submersible platform. In order to reduce the heave response and construction cost of the semi-submersible platform, the variation range of the main scale of the platform is determined according to the data of the existing semi-submersible platform, and 20 groups of sample points are selected by the optimal Latin hypercube sampling method. The radial basis function agent model is used to fit the heave, roll, air gap and stability of the platform. Based on the optimization software Isight, the main scale of the platform is optimized under the constraints of air gap, roll and stability, and the Pareto solution set of the optimization problem is obtained by taking the heave response and the construction cost of the platform as the target and the air gap, roll and stability as the constraint conditions. The results of the research on the hydrodynamic performance of semi-submersible platform and its optimal design method are useful for the conceptual design of semi-submersible platform.
【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)】：P742

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