發(fā)布時(shí)間：2018-06-29 22:47

  本文選題：鋼懸鏈立管 + 動(dòng)力分析��； 參考：《寧波大學(xué)》2014年碩士論文

【摘要】：我國(guó)的南海油氣資源非常豐富，但大部分處于深海。而我國(guó)的油氣開(kāi)采主要處于淺海區(qū)域，技術(shù)落后于其他國(guó)家，因此深海自主技術(shù)的研究迫在眉睫。深水開(kāi)發(fā)時(shí)，立管系統(tǒng)必不可少。鋼懸鏈立管是深水開(kāi)發(fā)立管系統(tǒng)的第一選擇。它和海洋纜索系統(tǒng)類似屬于細(xì)長(zhǎng)的海洋工程結(jié)構(gòu)物，幾何非線性非常顯著。 本文使用集中質(zhì)量法來(lái)研究鋼懸鏈立管的動(dòng)力響應(yīng)特性。該方法廣泛應(yīng)用于海洋纜索系統(tǒng)的動(dòng)力分析，在過(guò)去的幾十年中，已經(jīng)得到極大的完善并且計(jì)算結(jié)果足夠精確。目前大部分文獻(xiàn)在建立模型時(shí)，大都建立在自然坐標(biāo)系中，再通過(guò)坐標(biāo)轉(zhuǎn)換由自然坐標(biāo)系轉(zhuǎn)換到慣性坐標(biāo)系，在計(jì)算過(guò)程中還需要去除產(chǎn)生奇異性的點(diǎn)。本文在慣性系下推導(dǎo)出各種作用于鋼懸鏈立管的載荷的計(jì)算方程，由牛頓第二定律得出完整的三維集中質(zhì)量模型，該模型避免了繁瑣的坐標(biāo)轉(zhuǎn)換和奇異性的發(fā)生。同時(shí)為了編程方便，把模型轉(zhuǎn)化為了矩陣形式。求解方程時(shí)，為了減少計(jì)算量和節(jié)省求解時(shí)間本文使用自適應(yīng)步長(zhǎng)的龍格庫(kù)塔法，給出了三種不同形式的懸鏈線方程用于初值的計(jì)算，給定的初始條件不同，則選取不同形式的懸鏈線方程。 最后本文根據(jù)上述的理論成果使用MATLAB軟件編寫(xiě)了鋼懸鏈立管的動(dòng)力分析程序。首先使用三個(gè)算例驗(yàn)證了程序的準(zhǔn)確性和有效性，之后使用該程序分析簡(jiǎn)單型鋼懸鏈立管的動(dòng)力特性，討論了海流、立管內(nèi)流以及海洋平臺(tái)的運(yùn)動(dòng)對(duì)立管動(dòng)力響應(yīng)的影響�；谝陨戏治霭l(fā)現(xiàn)海流的流向、內(nèi)流的密度對(duì)立管內(nèi)部張力和彎矩的影響較大，立管以大位移的運(yùn)動(dòng)來(lái)適應(yīng)海洋平臺(tái)的運(yùn)動(dòng)。
[Abstract]:The South China Sea is rich in oil and gas resources, but most of them are in the deep sea. Oil and gas exploitation in China is mainly located in shallow sea area, and the technology lags behind other countries, so the research of deep sea independent technology is urgent. In deep water development, riser systems are essential. Steel catenary riser is the first choice of deep water development riser system. It is similar to the ocean cable system and belongs to the slender marine engineering structure, and the geometric nonlinearity is very significant. In this paper, the dynamic response of steel catenary risers is studied by means of lumped mass method. This method has been widely used in the dynamic analysis of ocean cable systems. In the past few decades, it has been greatly improved and the calculation results are accurate enough. At present, most of the literature is based on the natural coordinate system, and then the coordinate transformation from the natural coordinate system to the inertial coordinate system. In the process of calculation, it is necessary to remove the singularity point. In this paper, the calculation equations of various loads acting on steel catenary risers are derived under the inertial system, and the complete three-dimensional lumped mass model is derived from Newton's second law, which avoids the complicated coordinate transformation and singularity. At the same time, for the convenience of programming, the model is transformed into matrix form. In order to reduce the computation cost and save the solving time, three different catenary equations are given in this paper by using the Runge-Kutta method with adaptive step size for the initial value calculation. The given initial conditions are different. Then different forms of catenary equations are selected. Finally, the dynamic analysis program of steel catenary riser is compiled with MATLAB software according to the above theoretical results. At first, three examples are used to verify the accuracy and validity of the program, and then the dynamic characteristics of the simple steel catenary riser are analyzed, and the effects of the current, the flow in the riser and the motion of the offshore platform on the dynamic response of the tube are discussed. Based on the above analysis, it is found that the flow direction of the current and the density of the inner current have a great influence on the tension and bending moment in the tube, and the riser adopts the movement of large displacement to adapt to the motion of the offshore platform.
【學(xué)位授予單位】：寧波大學(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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本文編號(hào)：2083677