本文選題：單點系泊 + 系泊纜��； 參考：《大連理工大學》2014年碩士論文

【摘要】：單點系泊系統(tǒng)因其具有良好的風向標效應以及低成本等優(yōu)勢被廣泛的應用于海洋油氣開發(fā)生產(chǎn)之中。隨著海洋環(huán)境的變化以及探索領域的擴大,單點系泊系統(tǒng)在應用海洋油氣生產(chǎn)的過程中出現(xiàn)新的問題和考驗,在進行系泊設計過程中,越來越多的新的因素需要被考慮。 本文主要針對系泊纜索與浮體的耦合計算方法,研究了單點系泊系統(tǒng)在隨機海況下的運動和受力特點。著重分析了傾斜海底條件以及瞬態(tài)潮汐流兩種因素對單點系泊系統(tǒng)運動和受力的影響。 單點系泊系統(tǒng)會受到海底地形的影響,為了便于分析,將海底簡化為帶有一定坡度的平面。在研究傾斜海底對系泊纜的影響時,首先介紹了任意海底形態(tài)下系泊纜張力計算模型。然后據(jù)此分析了海底地形對單根系泊纜張力和內(nèi)轉(zhuǎn)塔系泊系統(tǒng)性能的影響。分析的結(jié)果表明,系纜低頻運動是造成傾斜海底對系纜張力產(chǎn)生影響的最主要因素。當海底存在小角度傾斜時,通過調(diào)整系纜長度,使預張力水平分力相等的方式能夠有效降低傾角對系泊性能的影響,但是當海底傾角較大時,海底傾角對系泊系統(tǒng)的影響是不可忽略的。 為了研究單點系泊系統(tǒng)在潮汐流作用下的大回轉(zhuǎn)問題,以渤海灣一處單錨搖臂系泊系統(tǒng)為例,通過對水動力軟件AQWA進行二次開發(fā),使用Fortran語言編寫子程序,實時獲取FPSO的位置以速度,從而實現(xiàn)了流載荷的計算。并在穩(wěn)態(tài)流以及瞬態(tài)流的條件下,驗證了方法的正確性。在此基礎上,根據(jù)給定的潮流表,模擬了系泊系統(tǒng)24小時的運動。從結(jié)果中發(fā)現(xiàn)FPSO在潮汐流作用下發(fā)生大角度回轉(zhuǎn)的同時會伴隨小幅往復運動,這種小角度回轉(zhuǎn)過程在總行程計算中具有重要的作用,通過數(shù)值模擬方法,能夠準確地計算出回轉(zhuǎn)的總行程。從而彌補了傳統(tǒng)工程分析方法的不足,具有一定的工程應用價值。
[Abstract]:Single point mooring system is widely used in offshore oil and gas production because of its good wind vane effect and low cost.With the change of marine environment and the expansion of exploration field, new problems and tests appear in the process of application of single point mooring system in offshore oil and gas production. In the process of mooring design, more and more new factors need to be considered.In this paper, the motion and force characteristics of a single point mooring system under random sea conditions are studied, aiming at the coupled calculation method of mooring cable and floating body.The effects of inclined seabed conditions and transient tidal flow on the motion and force of a single point mooring system are emphatically analyzed.The single point mooring system is affected by the submarine topography. In order to be easy to analyze, the seabed is simplified to a plane with a certain slope.In order to study the influence of inclined seabed on mooring cable, the calculation model of mooring cable tension under arbitrary submarine configuration is introduced.Then the influence of submarine topography on the tension of single mooring cable and the performance of mooring system of inner turret is analyzed.The results show that the low frequency motion of mooring cable is the most important factor which causes the cable tension to be affected by inclined seabed.When the seabed is inclined at a small angle, the influence of dip angle on mooring performance can be effectively reduced by adjusting the length of mooring cable so that the pretension horizontal component is equal, but when the submarine dip angle is large,The influence of submarine inclination on mooring system can not be ignored.In order to study the large slalom problem of single point mooring system under tidal current, taking a single anchor rocker arm mooring system in Bohai Bay as an example, through the secondary development of hydrodynamic software AQWA, the subprogram is written in Fortran language.The position of the FPSO is obtained in real time at the speed, thus the calculation of the flow load is realized.The correctness of the method is verified under the condition of steady flow and transient flow.On this basis, the 24-hour mooring system motion is simulated according to the given power flow table.From the results, it is found that the large angle rotation of FPSO occurs under the action of tidal flow and accompanied by small reciprocating motion. This small angle rotation process plays an important role in the calculation of the total stroke, and the numerical simulation method is used.The total stroke of rotation can be calculated accurately.Therefore, it makes up for the deficiency of traditional engineering analysis method and has certain engineering application value.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U674.38;U661

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本文編號：1746102