本文選題：材料非線性　切入點：張緊式系泊回復(fù)剛度　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：由于具有穩(wěn)定良好的作業(yè)性能，深海桁架式Spar平臺得到廣泛應(yīng)用，對于桁架式Spar平臺大水深的工作環(huán)境，現(xiàn)今其多采用張緊式系泊系統(tǒng)進行定位。研究張緊式系泊系統(tǒng)非線性回復(fù)特性，以及在系泊作用下的平臺固有運動特性和在規(guī)則波中的耦合動力響應(yīng)，對平臺的設(shè)計具有重要的意義。 本文針對深海桁架式Spar平臺，考慮了三點九根纜索張緊式系泊定位形式，研究其在六個自由度方向上的固有運動特性以及在規(guī)則波中的動力響應(yīng)特性。以線性材料纜索經(jīng)典懸鏈線理論為基礎(chǔ)，同時考慮聚酯纖維纜索的材料非線性特性與幾何非線性特性，對纜索微段靜力平衡方程進行重新推導(dǎo)，建立了單根聚酯纖維纜索靜力平衡方程。在單根纜索求解的基礎(chǔ)上采用準靜態(tài)方法計算三點系泊系統(tǒng)的位移-回復(fù)力變化曲線，并研究有關(guān)系泊因素對系泊系統(tǒng)回復(fù)剛度的影響。建立系泊平臺耦合運動方程，運用數(shù)值方法求解平臺各自由度固有運動特性，并討論不同系泊條件對平臺自振特性的影響。同時，建立水動力模型計算平臺在規(guī)則波中的波浪載荷，計算當(dāng)波浪圓頻率與垂蕩固有頻率相接近時，平臺發(fā)生垂蕩主共振時的運動響應(yīng)。 研究表明，張緊式系泊系統(tǒng)在平臺小幅運動下平臺回復(fù)力與位移基本成線性關(guān)系，隨著平臺位移的增大，，系泊回復(fù)力開始表現(xiàn)出非線性變化；系泊條件的改變將會改變平臺水平運動的固有頻率。系泊系統(tǒng)回復(fù)剛度對于不同方向上的運動的影響程度不同。適當(dāng)?shù)南挡聪到y(tǒng)使平臺在波浪中的運動響應(yīng)幅值降低，但并不能阻止平臺發(fā)生垂蕩主共振時平臺搖動幅值在某一波高下發(fā)生突變現(xiàn)象。三點系泊形式導(dǎo)致平臺縱蕩運動與橫蕩運動的固有周期不一致，從而導(dǎo)致在不同浪向角下平臺運動幅值的不對稱。
[Abstract]:Because of its stable and good working performance, deep-sea truss Spar platform is widely used. For the working environment of truss Spar platform with large water depth, Nowadays, most of the mooring systems are located by tensed-tight mooring system. The nonlinear recovery characteristics of the tensed-mooring system, the inherent motion characteristics of the platform under mooring and the coupled dynamic response in regular waves are studied. It is of great significance to the design of platform. In this paper, 3.9 cable tensioning mooring modes are considered for deep-sea truss Spar platform. Based on the classical catenary theory of linear materials, the inherent motion characteristics in six degrees of freedom and the dynamic response in regular waves are studied. At the same time, considering the material nonlinear and geometric nonlinear characteristics of polyester fiber cable, the static equilibrium equation of micro-segment of cable is rededuced. The static equilibrium equation of a single polyester fiber cable is established. Based on the solution of a single cable, a quasi-static method is used to calculate the displacement-recovery force curve of a three-point mooring system. The effect of mooring factors on the stiffness of mooring system is studied. The coupled motion equation of mooring platform is established, and the inherent motion characteristics of each degree of freedom of the platform are solved by numerical method. The influence of different mooring conditions on the natural vibration characteristics of the platform is discussed. At the same time, the hydrodynamic model is established to calculate the wave loads in regular waves, and the wave circle frequency is calculated when the wave circle frequency is close to the natural frequency of the heave. The motion response of the platform when the main pendulum resonance occurs. The results show that the recovery force and displacement of the tensioned mooring system are linear under the small motion of the platform. With the increase of the displacement of the platform, the mooring force begins to show nonlinear changes. The change of mooring condition will change the natural frequency of the horizontal motion of the platform. The effect of the mooring system recovery stiffness on the motion in different directions will be different. The appropriate mooring system will reduce the amplitude of the platform motion response in the wave. But it can not prevent the platform rocking amplitude from abrupt change at a certain wave height when the platform is swinging main resonance. The three-point mooring mode leads to the inconsistency of the inherent period between the longitudinal motion of the platform and the motion of the swinging motion. This results in the asymmetry of the amplitude of platform motion at different wave angles.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U674.381

【參考文獻】

相關(guān)期刊論文 前10條

1 曾曉輝,沈曉鵬,吳應(yīng)湘,劉杰鳴;深海平臺分析和設(shè)計中的關(guān)鍵力學(xué)問題[J];船舶工程;2005年05期

2 唐友剛;張若瑜;劉利琴;胡楠;;深海系泊系統(tǒng)動張力有限元計算[J];海洋工程;2009年04期

3 張蕙;楊建民;肖龍飛;楊立軍;;均勻流中深水系泊Truss Spar平臺渦激運動試驗研究[J];海洋工程;2011年04期

4 劉海笑;黃澤偉;;新型深海系泊系統(tǒng)及數(shù)值分析技術(shù)[J];海洋技術(shù);2007年02期

5 嵇春艷;元志明;徐勝;黃山;;一種適用于深水浮式海洋平臺結(jié)構(gòu)的新型系泊系統(tǒng)設(shè)計及水動力性能分析[J];海洋技術(shù);2012年02期

6 王芳;加強海洋資源開發(fā) 促進社會經(jīng)濟可持續(xù)發(fā)展[J];國土資源;2002年07期

7 黃維平;白興蘭;孫傳棟;玄金;;國外Spar平臺研究現(xiàn)狀及中國南海應(yīng)用前景分析[J];中國海洋大學(xué)學(xué)報(自然科學(xué)版);2008年04期

8 袁夢;范菊;繆國平;朱仁傳;;非線彈性系泊纜系泊性能[J];上海交通大學(xué)學(xué)報;2010年06期

9 周國平;;海洋工程裝備關(guān)鍵技術(shù)和支撐技術(shù)分析[J];船舶與海洋工程;2012年01期

10 楊雄文;樊洪海;;Spar平臺結(jié)構(gòu)型式及總體性能分析[J];石油礦場機械;2008年05期

相關(guān)博士學(xué)位論文 前1條

1 袁夢;深海浮式結(jié)構(gòu)物系泊系統(tǒng)的非線性時域分析[D];上海交通大學(xué);2011年

本文編號：1625711