水深對軟剛臂式FPSO淺水效應及觸底的影響
發(fā)布時間：2018-11-06 12:45
【摘要】：對于淺水軟剛臂式單點系泊FPSO,淺水效應和觸底問題是引起系泊載荷過大和FPSO結(jié)構(gòu)損壞的重要因素,也是當前研究的兩大熱點問題。本文針對30萬噸級、16萬噸級和5萬噸級軟剛臂式單點系泊FPSO的共八種裝載工況,分別采用Newman近似法和Pinkster近似法考慮FPSO所受二階波浪力,計算了不同WD/T(水深吃水比)條件下單點系泊系統(tǒng)受力,分析系泊系統(tǒng)受力隨WD/T變化的規(guī)律。此外,本文給出了計算FPSO須考慮淺水效應的/LWD T(臨界水深吃水比)的方法,分別計算了三艘FPSO在八種裝載工況下的/LWD T,分析了該臨界值隨FPSO吃水、噸位變化的規(guī)律,并進一步對“FPSO須考慮淺水效應的/LWD T數(shù)據(jù)庫”進行概念設計。本文還從頻域和時域兩個方面分別對三艘FPSO滿載工況下的觸底問題進行了研究和分析。通過本文的研究工作,得出了如下主要結(jié)論:(1)FPSO的二階波浪載荷傳遞函數(shù)矩陣值整體隨水深的增加逐漸減小;對于某些差頻項,在淺水條件下,Pinkster近似法計算得到的二階波浪載荷傳遞函數(shù)值遠大于Newman近似法的計算值。(2)采用Newman近似法考慮二階波浪力時,FPSO所受系泊力隨WD/T的增加先增大后減小,但變化范圍不大;采用Pinkster近似法考慮二階波浪力時,系泊力隨WD/T的增大逐漸減小,且淺水條件下的系泊力遠大于深水條件下的系泊力。(3)淺水條件下,Pinkster近似法計算得到的單點系泊力遠大于Newman近似法計算得到的系泊力;在超過一定WD/T時,Pinkster近似法計算得到的單點系泊力將小于Newman近似法計算得到的結(jié)果;兩種方法的所得系泊力相等時對應的WD/T,可作為工程上FPSO須考慮淺水效應的/LWD T。(4)對于同一FPSO,須考慮淺水效應的/LWD T隨吃水的增加而減小;利用FPSO排水體積將FPSO吃水無量綱化后,對于同一吃水,FPSO須考慮淺水效應的/LWD T隨FPSO噸位的增加而減小。(5)將FPSO的型式、設計排水量、吃水等參數(shù)作為變量,可以建立FPSO須考慮淺水效應的/LWD T數(shù)據(jù)庫;在工程設計中,僅需根據(jù)FPSO的各項設計參數(shù),即可在數(shù)據(jù)庫中查找其須考慮淺水效應的/LWD T。(6)給出了頻域和時域內(nèi)FPSO觸底問題的分析方法,并在時域內(nèi)計算了滿載工況下各FPSO發(fā)生觸底的/LWD T,30萬噸級FPSO的/LWD T為1.04,16萬噸級FPSO的/LWD T為1.05,5萬噸級FPSO的/LWD T為1.34。
[Abstract]:The shallow water effect and bottom contact of FPSO, with soft rigid arm mooring in shallow water are the important factors that cause the excessive mooring load and the damage of FPSO structure, and are also two hot issues in current research. In this paper, the second order wave force of FPSO is considered by Newman approximation method and Pinkster approximation method for eight loading conditions of 300, 160, and 50, 000 tonnage soft rigid arm mooring FPSO, respectively. The forces of mooring system with different WD/T (depth to draft ratio) conditions are calculated and the law of mooring system with WD/T is analyzed. In addition, this paper gives a method to calculate the / LWD T (critical depth draught ratio of FPSO considering the shallow water effect, calculates the / LWD T of three FPSO ships under eight loading conditions, and analyzes the rule of the critical value changing with the draught and tonnage of FPSO. Furthermore, the conceptual design of FPSO / LWD T database considering shallow water effect is carried out. In this paper, the bottom problem of three FPSO under full load condition is studied and analyzed in frequency domain and time domain respectively. The main conclusions are as follows: (1) the second order wave load transfer function matrix of FPSO decreases with the increase of water depth; For some differential frequency terms, in shallow water, the second order wave load transfer function calculated by Pinkster approximation is much larger than that by Newman approximation. (2) when the second order wave force is considered by Newman approximation, The mooring force of FPSO increases first and then decreases with the increase of WD/T, but the range is not changed. When the second order wave force is considered by Pinkster approximation, the mooring force decreases with the increase of WD/T, and the mooring force in shallow water is much larger than that in deep water. (3) in shallow water, the mooring force in shallow water is much larger than that in deep water. The single point mooring force calculated by Pinkster approximation method is much larger than that by Newman approximation method. The single point mooring force calculated by the Pinkster approximation method is smaller than that obtained by the Newman approximation method when it exceeds a certain WD/T. When the mooring force of the two methods is equal, the corresponding WD/T, can be regarded as / LWD T. (_ 4 where the FPSO should consider the shallow water effect for the same FPSO,) / LWD T decreases with the increase of the draught. When FPSO draught is dimensionless by using FPSO drainage volume, for the same draught, the / LWD T of the shallow water effect should be reduced with the increase of FPSO tonnage. (5) the parameters such as FPSO type, design displacement, draught and so on are taken as variables. The / LWD T database with shallow water effect in FPSO can be established. In engineering design, only according to the design parameters of FPSO, we can find / LWD T. (6, which should consider shallow water effect, in the database. The analysis method of FPSO bottom problem in frequency domain and time domain is given. In the time domain, the / LWD T of / LWD T = 1.04t FPSO / LWD T = 1.05t FPSO / LWD T is 1.340.The ratio of / LWD T of 300,000t FPSO to that of FPSO / LWD T = 1.05t FPSO is calculated in the time domain under the condition of full load.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U674.38
本文編號：2314314
[Abstract]:The shallow water effect and bottom contact of FPSO, with soft rigid arm mooring in shallow water are the important factors that cause the excessive mooring load and the damage of FPSO structure, and are also two hot issues in current research. In this paper, the second order wave force of FPSO is considered by Newman approximation method and Pinkster approximation method for eight loading conditions of 300, 160, and 50, 000 tonnage soft rigid arm mooring FPSO, respectively. The forces of mooring system with different WD/T (depth to draft ratio) conditions are calculated and the law of mooring system with WD/T is analyzed. In addition, this paper gives a method to calculate the / LWD T (critical depth draught ratio of FPSO considering the shallow water effect, calculates the / LWD T of three FPSO ships under eight loading conditions, and analyzes the rule of the critical value changing with the draught and tonnage of FPSO. Furthermore, the conceptual design of FPSO / LWD T database considering shallow water effect is carried out. In this paper, the bottom problem of three FPSO under full load condition is studied and analyzed in frequency domain and time domain respectively. The main conclusions are as follows: (1) the second order wave load transfer function matrix of FPSO decreases with the increase of water depth; For some differential frequency terms, in shallow water, the second order wave load transfer function calculated by Pinkster approximation is much larger than that by Newman approximation. (2) when the second order wave force is considered by Newman approximation, The mooring force of FPSO increases first and then decreases with the increase of WD/T, but the range is not changed. When the second order wave force is considered by Pinkster approximation, the mooring force decreases with the increase of WD/T, and the mooring force in shallow water is much larger than that in deep water. (3) in shallow water, the mooring force in shallow water is much larger than that in deep water. The single point mooring force calculated by Pinkster approximation method is much larger than that by Newman approximation method. The single point mooring force calculated by the Pinkster approximation method is smaller than that obtained by the Newman approximation method when it exceeds a certain WD/T. When the mooring force of the two methods is equal, the corresponding WD/T, can be regarded as / LWD T. (_ 4 where the FPSO should consider the shallow water effect for the same FPSO,) / LWD T decreases with the increase of the draught. When FPSO draught is dimensionless by using FPSO drainage volume, for the same draught, the / LWD T of the shallow water effect should be reduced with the increase of FPSO tonnage. (5) the parameters such as FPSO type, design displacement, draught and so on are taken as variables. The / LWD T database with shallow water effect in FPSO can be established. In engineering design, only according to the design parameters of FPSO, we can find / LWD T. (6, which should consider shallow water effect, in the database. The analysis method of FPSO bottom problem in frequency domain and time domain is given. In the time domain, the / LWD T of / LWD T = 1.04t FPSO / LWD T = 1.05t FPSO / LWD T is 1.340.The ratio of / LWD T of 300,000t FPSO to that of FPSO / LWD T = 1.05t FPSO is calculated in the time domain under the condition of full load.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U674.38
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