深水鋼懸鏈立管的動力分析
發(fā)布時間:2018-06-29 22:47
本文選題:鋼懸鏈立管 + 動力分析 ; 參考:《寧波大學》2014年碩士論文
【摘要】:我國的南海油氣資源非常豐富,但大部分處于深海。而我國的油氣開采主要處于淺海區(qū)域,技術落后于其他國家,因此深海自主技術的研究迫在眉睫。深水開發(fā)時,立管系統(tǒng)必不可少。鋼懸鏈立管是深水開發(fā)立管系統(tǒng)的第一選擇。它和海洋纜索系統(tǒng)類似屬于細長的海洋工程結構物,幾何非線性非常顯著。 本文使用集中質(zhì)量法來研究鋼懸鏈立管的動力響應特性。該方法廣泛應用于海洋纜索系統(tǒng)的動力分析,在過去的幾十年中,已經(jīng)得到極大的完善并且計算結果足夠精確。目前大部分文獻在建立模型時,大都建立在自然坐標系中,再通過坐標轉(zhuǎn)換由自然坐標系轉(zhuǎn)換到慣性坐標系,在計算過程中還需要去除產(chǎn)生奇異性的點。本文在慣性系下推導出各種作用于鋼懸鏈立管的載荷的計算方程,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轉(zhuǎn)換和奇異性的發(fā)生。同時為了編程方便,把模型轉(zhuǎn)化為了矩陣形式。求解方程時,為了減少計算量和節(jié)省求解時間本文使用自適應步長的龍格庫塔法,給出了三種不同形式的懸鏈線方程用于初值的計算,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軟件編寫了鋼懸鏈立管的動力分析程序。首先使用三個算例驗證了程序的準確性和有效性,之后使用該程序分析簡單型鋼懸鏈立管的動力特性,討論了海流、立管內(nèi)流以及海洋平臺的運動對立管動力響應的影響。基于以上分析發(fā)現(xiàn)海流的流向、內(nèi)流的密度對立管內(nèi)部張力和彎矩的影響較大,立管以大位移的運動來適應海洋平臺的運動。
[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.
【學位授予單位】:寧波大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:P742
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