WO2014108432A1 - Unité flottante et procédé permettant de réduire les mouvements de pilonnement et de tangage/roulis d'une unité flottante - Google Patents

Unité flottante et procédé permettant de réduire les mouvements de pilonnement et de tangage/roulis d'une unité flottante Download PDF

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Publication number
WO2014108432A1
WO2014108432A1 PCT/EP2014/050208 EP2014050208W WO2014108432A1 WO 2014108432 A1 WO2014108432 A1 WO 2014108432A1 EP 2014050208 W EP2014050208 W EP 2014050208W WO 2014108432 A1 WO2014108432 A1 WO 2014108432A1
Authority
WO
WIPO (PCT)
Prior art keywords
floating unit
section
floating
flare angle
draught
Prior art date
Application number
PCT/EP2014/050208
Other languages
English (en)
Inventor
Erik Pettersen
Finn-Christian Wickmann HANSSEN
Original Assignee
Moss Maritime As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Moss Maritime As filed Critical Moss Maritime As
Priority to CN201480012879.XA priority Critical patent/CN105026252A/zh
Priority to BR112015016782A priority patent/BR112015016782A2/pt
Publication of WO2014108432A1 publication Critical patent/WO2014108432A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/24—Buoys container type, i.e. having provision for the storage of material
    • B63B22/26—Buoys container type, i.e. having provision for the storage of material having means to selectively release contents, e.g. swivel couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/041—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with disk-shaped hull
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/24—Buoys container type, i.e. having provision for the storage of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/08—Ice-breakers or other vessels or floating structures for operation in ice-infested waters; Ice-breakers, or other vessels or floating structures having equipment specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/10—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by damping the waves, e.g. by pouring oil on water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/10—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by damping the waves, e.g. by pouring oil on water
    • B63B2039/105—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by damping the waves, e.g. by pouring oil on water by absorption of wave energy, e.g. by structured, wave energy absorbing hull surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2211/00—Applications
    • B63B2211/06—Operation in ice-infested waters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2241/00—Design characteristics
    • B63B2241/02—Design characterised by particular shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2241/00—Design characteristics
    • B63B2241/02—Design characterised by particular shapes
    • B63B2241/10—Design characterised by particular shapes by particular three dimensional shapes

Definitions

  • the present invention relates to improving the motion characteristics of a single barrel floating unit. It has been observed that this type of floating units can be subjected to excessive roll/pitch motions in some sea conditions. Similar designs of floating units try to eliminate such motions by providing as much damping as possible to the floating unit.
  • Single barrel floating structures have previously been described, for example in the published PCT-application WO 02/090177 Al and the published US patent application No. 2012/0298027 Al.
  • a floating structure for use in ice-covered water comprising a single barrel hull which is designed to decrease ice loads and provide more ice breaking mechanisms than conventional vessel structures.
  • the floating vessel is provided with a conically shaped part and an uneven sided polygonal shape of the hull in order to break the ice more efficiently. Pitch/roll, heave and surge motions are induced by shifting ballast water in the ballast tanks, thereby breaking the ice more efficiently.
  • the differential equation above may represent the pitch/roll motion, and the stiffness variation may be represented by the variation of the metacentric height (GM) caused by heave motions.
  • GM metacentric height
  • a floating unit comprising a single centre barrel having a longitudinal centre axis.
  • the central barrel comprises a lower main section and an upper section extending up from the main section and having at least one outward facing side, i.e. facing away from the interior of the floating unit and towards the surroundings, which forms a flare angle ( ⁇ ) with a vertical axis.
  • the upper section penetrates a still water surface when the floating unit is in use.
  • the upper section as seen in a side view, may be conically shaped or alternatively the upper section, as seen in a side view, may have a curved shape.
  • the upper section penetrates a still water surface when the floating unit is in use.
  • the main section of the floating structure further has an equivalent diameter (D), a still water draught (T) and a metacentric height (KM) which is given as a function of the diameter (D), the still water draught (T), the flare angle ( ⁇ ) and a variable part (x) of the draught which is a result of the motions of the floating unit (10) such that
  • Figure 5 shows a plot where 6KM(D,T, ⁇ , ⁇ ) is plotted for several angles as a function of the draught (T).
  • the octagonal or polygonal shape is not relevant for the considerations related to the present invention, so we will in the mathematical expressions below assume that the claimed invention has a circular cross section with diameter D and draught T.
  • the diameter may be selected such that ⁇ /4* ⁇ 2 will give the same cross sectional area as the octagon of the actual floating unit under consideration.
  • a circular barrel comprising a main section with a constant cross section as function of height will therefore be considered.
  • the metacentric height which is the distance from the keel to the metacenter KM, may be written:
  • KM KB + BM
  • KB is the distance from the keel to the center of buoyancy
  • BM is the metacentric height which is the distance from the center of buoyancy to the metacenter.
  • BM can be written:
  • a floating unit with a diameter of 90 m is chosen herein, but a floating unit having a different diameter D will obviously be having different results.
  • Figure 3 also shows that for each diameter, there is a draught (T) which gives zero value of the variation of KM.
  • T draught
  • the pitch/roll motions and the heave motions of the single barrel floating unit may be decoupled.
  • the flare angle ⁇ that the outward facing sides 13 of the conical upper section 12 makes with the longitudinal axis (i.e. generally with a vertical line) is shown in Figures 7 and 9.
  • the size of the flare angle ⁇ depends on the main particulars of the floating unit 10 as will be explained below.
  • the distance from the waterline 25 down to the cylindrical part is "h".
  • the conical upper section 12 will also extend a distance above the waterline, preferably at least a distance "h”.
  • both the KB and the BM values can be calculated.
  • the KM as a function of the following parameters:
  • T is the static ( still water) draught
  • ⁇ is the flare angle that has to be found
  • x represents the vertical motion from the initial draught as a result of the motions of the floating unit.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Barrages (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Vibration Prevention Devices (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne une unité flottante (10) comprenant un tambour central unique (11) présentant un axe central longitudinal (22). Le tambour central comprend une section principale inférieure (14) et une section supérieure (12) s'étendant vers le haut depuis la section principale (14) et présentant au moins une face orientée vers l'extérieur (20) qui forme un angle d'évasement (φ) avec l'axe longitudinal (22). La section supérieure (12) pénètre dans une surface d'eau calme (30) lorsque l'unité flottante est utilisée. La section principale (14) de la structure flottante (10) présente un diamètre équivalent (D), un tirant d'eau en eau calme (T) et une hauteur métacentrique (KM) qui est fournie en fonction du diamètre (D), du tirant d'eau en eau calme (T), de l'angle d'évasement (φ) et d'une partie variable (x) du tirant d'eau qui est un résultat des mouvements de l'unité flottante (10) tel que KM = ΚΜ(D,Τ,φ,x). L'angle d'évasement (φ) de la section supérieure (12) est compris dans une plage de ± 20 % de l'angle d'évasement φ qui répond à l'équation d(KM(D,T,φ,x))/dx = 0.
PCT/EP2014/050208 2013-01-11 2014-01-08 Unité flottante et procédé permettant de réduire les mouvements de pilonnement et de tangage/roulis d'une unité flottante WO2014108432A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201480012879.XA CN105026252A (zh) 2013-01-11 2014-01-08 浮动单元和减小浮动单元的升沉和侧倾/翻动运动的方法
BR112015016782A BR112015016782A2 (pt) 2013-01-11 2014-01-08 unidade flutuante e método para reduzir movimentos de suspiro e a inclinação / rotação de uma unidade flutuante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20130081A NO339535B1 (no) 2013-01-11 2013-01-11 Flytende enhet og fremgangsmåte for å redusere stampe og rullebevegelser til en flytende enhet
NO20130081 2013-01-11

Publications (1)

Publication Number Publication Date
WO2014108432A1 true WO2014108432A1 (fr) 2014-07-17

Family

ID=49949665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/050208 WO2014108432A1 (fr) 2013-01-11 2014-01-08 Unité flottante et procédé permettant de réduire les mouvements de pilonnement et de tangage/roulis d'une unité flottante

Country Status (4)

Country Link
CN (1) CN105026252A (fr)
BR (1) BR112015016782A2 (fr)
NO (1) NO339535B1 (fr)
WO (1) WO2014108432A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10196114B2 (en) 2015-05-13 2019-02-05 Crondall Energy Consultants Ltd. Floating production unit and method of installing a floating production unit
CN110155263A (zh) * 2019-06-05 2019-08-23 中国海洋石油集团有限公司 一种圆筒形半潜式钻井平台
CN114275110A (zh) * 2021-12-28 2022-04-05 谢沛鸿 一种水母冰山式的海中建筑结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109850086B (zh) * 2019-03-20 2020-01-03 鲁东大学 一种浮动式海上平台抗海浪稳定装置
CN116502570B (zh) * 2023-06-30 2023-09-19 中国空气动力研究与发展中心空天技术研究所 一种超高速飞行器纵横向耦合运动稳定性分析方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434741A (en) * 1982-03-22 1984-03-06 Gulf Canada Limited Arctic barge drilling unit
WO2002090177A1 (fr) 2001-05-10 2002-11-14 Sevan Marine As Plate-forme de forage en mer pour la prospection ou la production d'hydrocarbures
US6761508B1 (en) * 1999-04-21 2004-07-13 Ope, Inc. Satellite separator platform(SSP)
WO2009136799A1 (fr) * 2008-05-09 2009-11-12 Sevan Marine As Plate-forme flottante et son procédé de fonctionnement
WO2011056695A1 (fr) * 2009-11-08 2011-05-12 SSP Offshore Inc. Structure flottante de forage, de production, de stockage et de déchargement en mer
US20120298027A1 (en) 2007-01-01 2012-11-29 Nagan Srinivasan Offshore floating production, storage, and off-loading vessel for use in ice-covered and clear water applications

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Publication number Priority date Publication date Assignee Title
US2771617A (en) * 1952-11-28 1956-11-27 Howard T Jeandron Means for mooring and refueling boats, seaplanes, and the like
US20040240946A1 (en) * 2001-10-22 2004-12-02 Ope Technology, Llc Floating platform with separators and storage tanks for LNG and liquid gas forms of hydrocarbons
US8662000B2 (en) * 2009-11-08 2014-03-04 Ssp Technologies, Inc. Stable offshore floating depot

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434741A (en) * 1982-03-22 1984-03-06 Gulf Canada Limited Arctic barge drilling unit
US6761508B1 (en) * 1999-04-21 2004-07-13 Ope, Inc. Satellite separator platform(SSP)
WO2002090177A1 (fr) 2001-05-10 2002-11-14 Sevan Marine As Plate-forme de forage en mer pour la prospection ou la production d'hydrocarbures
US20120298027A1 (en) 2007-01-01 2012-11-29 Nagan Srinivasan Offshore floating production, storage, and off-loading vessel for use in ice-covered and clear water applications
WO2009136799A1 (fr) * 2008-05-09 2009-11-12 Sevan Marine As Plate-forme flottante et son procédé de fonctionnement
WO2011056695A1 (fr) * 2009-11-08 2011-05-12 SSP Offshore Inc. Structure flottante de forage, de production, de stockage et de déchargement en mer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10196114B2 (en) 2015-05-13 2019-02-05 Crondall Energy Consultants Ltd. Floating production unit and method of installing a floating production unit
CN110155263A (zh) * 2019-06-05 2019-08-23 中国海洋石油集团有限公司 一种圆筒形半潜式钻井平台
CN114275110A (zh) * 2021-12-28 2022-04-05 谢沛鸿 一种水母冰山式的海中建筑结构

Also Published As

Publication number Publication date
NO339535B1 (no) 2016-12-27
BR112015016782A2 (pt) 2017-07-11
CN105026252A (zh) 2015-11-04
NO20130081A1 (no) 2014-07-14

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