EP1807302A1 - Suppression de l'oscillation et systeme de commande d'une plate-forme flottante - Google Patents

Suppression de l'oscillation et systeme de commande d'une plate-forme flottante

Info

Publication number
EP1807302A1
EP1807302A1 EP04800709A EP04800709A EP1807302A1 EP 1807302 A1 EP1807302 A1 EP 1807302A1 EP 04800709 A EP04800709 A EP 04800709A EP 04800709 A EP04800709 A EP 04800709A EP 1807302 A1 EP1807302 A1 EP 1807302A1
Authority
EP
European Patent Office
Prior art keywords
energy absorption
chambers
suppression system
oscillation suppression
upper portion
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04800709A
Other languages
German (de)
English (en)
Other versions
EP1807302A4 (fr
Inventor
Steven J. Leverette
Michael W. Spillane
Oriol R. Rijken
Stephen E. Kibbee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seahorse Equipment Corp
Original Assignee
Seahorse Equipment Corp
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 Seahorse Equipment Corp filed Critical Seahorse Equipment Corp
Publication of EP1807302A1 publication Critical patent/EP1807302A1/fr
Publication of EP1807302A4 publication Critical patent/EP1807302A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B63B39/02—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
    • B63B39/03—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids

Definitions

  • the present invention relates to resonant oscillation suppression systems for offshore floating platforms.
  • TLPs Tension Leg Platforms
  • tendons are floating platforms that are held in place in the ocean by means of vertical structural mooring elements called tendons, which are typically fabricated from high strength, high quality steel tubulars, and include articulated connections on the top and bottom (tendon connectors) that reduce bending moments and stresses in the tendon system.
  • the TLP system cost begins to be driven by the cost of the tendon system due to the length and wall thickness of tendons and by fatigue considerations.
  • the increasing requirement for more steel cross-sectional area in addition to length in deeper water causes the tendon system to become heavier, thus increasing the tendon cost and reducing the payload carrying capacity of the platform system, i.e.
  • an oscillation suppression system is provided to inhibit resonant oscillations of a floating platform.
  • the oscillation suppression system includes energy absorbtion chambers that may be integrated into or be separately attached to the hull of the floating platform.
  • the chambers are comprised of air (or other gas) in the upper portion, which may be closed or partially vented to the atmosphere, and water in the lower portion, which is open at the bottom.
  • the enclosed air in the upper portion of the chamber acts as an air spring reacting between the floating platform and the water mass. Suppression of resonant oscillations of the floating platform is accomplished through air pressure variations in phase opposition to external forces on the floating platform.
  • the dimensions of the chambers are chosen to produce natural periods of water mass oscillation near the resonant periods of the floating platform. Pressure changes result from changes in the air chamber volume caused by the vertical motion of the water mass relative to the floating platform.
  • Fig. 1 is a side view of a mono-column floating platform depicting energy absorption chambers of the oscillation suppression system of the present invention attached to the hull of the floating platform;
  • Fig. 2 is a section view of the floating platform of the present invention taken along line 2-2 in Fig. 1;
  • Fig. 3 is a section view of an energy absorption chamber of the present invention
  • Fig. 4 is a section view of an energy absorption chamber of the present invention depicting valve venting means thereon
  • Figs. 5A - 5F are section views of alternate embodiments of energy absorption chambers of the present invention
  • Figs. 6A is a side view of a mono-column floating platform depicting stepped diameter energy absorption chambers of the present invention secured to the hull of the floating platform;
  • Fig. 6B is a section view of the floating platform of the present invention taken along line 6B-6B in Fig. 6A;
  • Fig. 7 is a partially broken away side view of a mono-column floating platform depicting an annular energy absorption chamber of the oscillation suppression system of the present invention incorporated in the hull of the floating platform
  • Fig. 8 is a section view of the floating platform of the present invention taken along line 8-8 in Fig. 7;
  • Fig. 9 is a section view of an alternate embodiment of the oscillation suppression system of the present invention depicting multiple energy absorption chambers incorporated in the hull of the floating platform;
  • Figs. 10 is a partially broken away side view of a multi-column floating platform depicting the oscillation suppresion system of the present invention incorporated within the four support columns of the floating platfo ⁇ n;
  • Figs. 11 is a section view of the floating platform of the present invention taken along line 11-11 in Fig. 10;
  • Figs. 12- 17 are side and section views depicting alternate embodiments of the oscillation suppression system of the present invention.
  • Fig. 18 is a schematic diagram representing a platfo ⁇ n and the oscillation suppression system of the present invention
  • Fig. 19 is a schematic diagram representing the oscillation suppression system of the present invention including controlled venting means.
  • a mono-column hull floating platform generally identified by the reference numeral 10 is shown.
  • the floating platform 10 includes a column or hull member 14 projecting above the water surface 16 supporting a platform deck 15 thereon.
  • Pontoons 18 extend radially outward from the base of the hull 14.
  • the floating platform 10 is anchored to the seabottom by tendons 20.
  • steel tendons are utilized to secure the floating platform 10 to the seabottom.
  • the tendon system must be designed to operate between tolerable minimum and maximum tensions, to restrict natural resonance motions, and to limit the fatigue damage caused by each stress cycle. The latter two are typically accomplished by increasing the cross-sectional area of the steel tendon, which increases the tendon axial stiffness. But this increases the weight of the tendon and reduces the payload carrying capacity of the platform 10.
  • Including an oscillation suppression system in the platform design may lessen the cost premiums associated with motion limiting and fatigue-driven tendon design.
  • the oscillation suppression system inhibits vertical and rotational resonance in the tendon system by applying an out-of-phase force on the TLP system, compensating external forces.
  • the tuned vibration absorbing system is similar in function to such systems used to prevent vibrations in machinery or swaying of tall building structures, but in this application is composed of water masses and air springs.
  • the tuned oscillation suppression system of the present invention is conceptually similar to a two-degree-of-freedom oscillator pair, in which energy associated with a large mass-spring system, mass M, spring stiffness K, is naturally transmitted to a smaller mass-spring system, mass m, spring stiffness k.
  • the platform 10 is the large mass Mp
  • the tendons 20 are the large spring Kp
  • water in one or more energy absorption chambers acts as the smaller mass, m w
  • air in the upper portion of the energy absorption chambers acts as the smaller spring stiffness, k a .
  • Air flow m a through a valve or throttle plate provides a damping effect to the air spring k a . and is used to adjust the tuned oscillation suppression system damping.
  • the air-water chambers of the oscillation suppression system of the invention operate as parasitic mass-spring systems transferring energy from the floating platform to the water.
  • Specification of the oscillation suppression system is controlled by the requirement that the natural frequency of the vertical oscillation of the water mass in the chambers be near the natural frequency of the floating platform system.
  • the oscillation suppression system's natural oscillation frequency depends on the ratio of the combined air-spring and water- column stiffness to the water-column mass. To maintain a fixed ratio between the oscillation suppression system's natural period and the floating system's natural period, changes in the stiffness and water mass of the oscillation suppression system must occur in the same proportion.
  • pressure changes result from changes in the air chamber volume caused by the vertical motions of the water mass relative to the floating platform.
  • the net force from the pressure changes that acts on the floating platform is proportional to the aggregate waterline area of the oscillation suppression system.
  • Individual oscillation suppression chambers should have small transverse dimensions compared to in-water column length to inhibit secondary, horizontal water mass displacements.
  • the platform 10 of the invention is provided with one or more energy absorption chambers secured on the hull 14 of the platform 10.
  • the energy absorption chambers comprise three cylinders 30 equally spaced about the hull 14.
  • the cylinders 30 include an open bottom end 32 and a closed or partially vented upper end 34.
  • the cylinders 30 are partially filled with a water mass 36.
  • the upper portion of the cylinders 30 is filled with air or other gas, which forms an air spring 38.
  • the water mass 36 oscillates vertically against the air spring 38 within the cylinders 30 and thereby inhibits resonant oscillations of the platform 10.
  • 3 and 4 show a means of damping of the oscillation suppression system of the invention without frictional or hydrodynamic drag forces acting on the water mass in the cylinders 30.
  • By controlled venting of air through an orifice 33 or a control valve 35 it is possible to damp the oscillation suppression system of the platform 10 and to remove large energy pulses from the system before the occurrence of large platform resonant oscillations and their associated high tendon stresses.
  • Figs. 5 A - 5F illustrate several embodiments of energy absorption chambers.
  • the energy absorption chamber is a cylinder 40 having an open bottom and a closed top.
  • the energy absorption cylinders 40 may include a screen or baffle plates 42 in the water mass portion (Fig. 5B) or in the air mass portion (Fig. 5C) of the cylinders 40. Screens or baffle plates may also be incorporated in both the air and water mass portions of the cylinders 40.
  • the cylinder 40 includes a sharp lower end 44 and in Fig. 5E the lower end 46 of the cylinder 40 provides a smooth flared entry into the bottom of the cylinder 40.
  • the cylinder 40 includes pipe 48 concentrically mounted within the cylinder 40 to control sloshing and to provided additional damping surfaces.
  • the energy absorption characteristics of the oscillation suppression and control system of the invention may also be adjusted by shortening or lengthening the water mass portion and/or the air mass portion of the energy absorbing cylinders 40. However, excessive hydrodynamic or frictional damping of the water mass may render the oscillation suppression system ineffective and should be avoided.
  • the oscillation suppression system of the invention comprises energy absorbing chambers 50 mounted about the hull 14 of the platform 10.
  • the chambers 50 are stepped diameter cylinders including a lower portion 52 having a diameter less than the diameter of an upper portion 54. Trapped air in the upper portion 54 forms an air spring 56.
  • the stepped diameter configuration of the energy absorbing chambers 50 permits the platform designer the flexibility to limit the height of the energy absorbing chambers 50 while still controlling the volume of the air spring 56.
  • the diameter of the water portion 52 is preferably constant for a particular design, flexibility is provided by altering the size and shape of the air spring 56 and thereby changing the volume of the upper portion 54 of the energy absorbing chambers 50 for fine tuning the oscillation suppression system of the invention. Fine tuning of the oscillation suppression system may also be accomplished by increasing the diameter of the lower portion 52 rather than the upper portion 54 of the energy absorbing chambers 50.
  • a platform 60 includes an annular configuration of the oscillation suppression system incorporated into the structure of the platform hull.
  • the oscillation suppression system comprises a vertical annular chamber 62 open at the bottom 63 and closed or partially vented at the top 65 thereof.
  • the outer surface 64 of the annular chamber 62 may define the outer diameter of the platform hull. Integrating the annular chamber 62 into the hull structure of the platform 60 may result in fabrication cost savings and may make it possible to economically obtain a large capacity oscillation suppression system.
  • the capacity of the oscillation suppression system may be altered by changing the external diameter of the platform hull, or the diameter of the inner wall 66 of the annular chamber 62.
  • the energy absorption characteristics of the annular chamber 62 may be altered further by partitioning the annular chamber 62 into multiple chambers 68 as shown in Fig. 9.
  • the chambers 68 are formed by installing partitions 70 in the annular chamber 62 between the inner and outer surfaces 64 and 66 forming the annular chamber 62. Not all segments of the partitioned annular chamber 62 need be utilized for energy absorption chambers.
  • the oscillation suppression system of the invention includes one or more energy absorbing chambers 82 mounted within the four columns 84 of a platform 80.
  • the energy absorbing chambers 82 are preferably located within the columns 84.
  • the upper ends of the absorbing chambers 82 are closed by plates 86 which secure the chambers 82 within the platform support columns 84.
  • Flange plates 88 circumscribing the open lower ends of the chambers 82 close off the bottom ends of the platform support columns 84.
  • the energy absorbing chambers 82 may also be attached to the outer surface of the platform columns 84 in a manner similar to that of the embodiment of the invention shown in Fig. 1 and described hereinabove.
  • Figs. 12 - 17 various alternate embodiments of the oscillation suppression system of the invention are shown which may be desired because of environmental and/or platform design criteria.
  • the alternate oscillation suppression system configurations include spherical air spring chambers 90 (Figs. 12 and 13), arcuate energy absorbing chambers 92 (Figs. 14 and 15), and energy absorbing chambers 94 designed integral to a platform hull (Figs. 16 and 17), or mounted in a moonpool of a platform.
  • the energy absorbing chambers shown in the figures and referred to in the discussion above are primarily referred to as single chambers, there may be vertical partitioning of any of the energy absorbing chambers to limit the horizontal extent of the free surface within a chamber. Vertical partitioning will prevent gravity waves from occurring, which may disrupt the dynamics of the oscillating mass.
  • the vertical partitions may extend only near the water line, or extend up to the full length of the energy absorbing chambers.
  • a gas or gases may be substituted for the use of air in the description of the invention above.
  • gases for example carbon dioxide or nitrogen, include elastic properties which fulfill the function of the air in the description of the invention, and may add other desirable qualities, such as better corrosion control or better control of pressure/volume behavior. While various embodiments of the invention have been shown and described, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Earth Drilling (AREA)

Abstract

Selon la présente invention, un système de suppression d'oscillation permet d'inhiber la résonance rotative et verticale d'une plate-forme flottante. Ce système de suppression d'oscillation comprend des chambres d'absorption d'énergie montées à la coque de la plate-forme flottante ou autour de celle-ci. Lesdites chambres peuvent être attachées séparément ou intégrées en tant que partie de la structure. Les chambres se composent de gaz dans une partie supérieure et d'une masse d'eau dans une partie inférieure. Elles sont fermées ou partiellement ventilées au niveau des extrémités supérieures et ouvertes au niveau de leurs extrémités inférieures. Le gaz renfermé de la partie supérieure de la chambre agit comme une source de gaz naturel réagissant contre la plate-forme flottante et la masse d'eau. La suppression des oscillations résonantes du système de plate-forme flottante est réalisée par des changements de pression de source de gaz naturel agissant sur le système de plate-forme flottante en opposition de phase aux forces externes.
EP04800709A 2004-11-03 2004-11-03 Suppression de l'oscillation et systeme de commande d'une plate-forme flottante Withdrawn EP1807302A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/036699 WO2006052234A1 (fr) 2004-11-03 2004-11-03 Suppression de l'oscillation et systeme de commande d'une plate-forme flottante

Publications (2)

Publication Number Publication Date
EP1807302A1 true EP1807302A1 (fr) 2007-07-18
EP1807302A4 EP1807302A4 (fr) 2011-09-21

Family

ID=36336800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04800709A Withdrawn EP1807302A4 (fr) 2004-11-03 2004-11-03 Suppression de l'oscillation et systeme de commande d'une plate-forme flottante

Country Status (5)

Country Link
EP (1) EP1807302A4 (fr)
CN (1) CN1926023B (fr)
AU (1) AU2004324515B8 (fr)
BR (1) BRPI0418958A8 (fr)
WO (1) WO2006052234A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101857080B (zh) * 2009-04-08 2012-04-25 深圳市海斯比船艇科技股份有限公司 耐震减阻型空气动力船
EA201400837A1 (ru) * 2012-01-23 2014-11-28 Трансоушен Седко Форекс Венчерз Лимитед Высококачественное определение скорости проходки для морского бурения
CN102765467B (zh) * 2012-08-10 2014-11-26 江苏中蕴风电科技有限公司 一种可移动海洋漂浮式主体模块结构
CN104085510B (zh) * 2014-06-18 2016-08-03 中国科学院力学研究所 一种基于小水线面减振装置的浮式平台运动抑制系统
CN104712703B (zh) * 2015-01-22 2016-11-30 中国科学院力学研究所 一种浮式平台六自由度整体运动抑制系统
CN106143813B (zh) * 2016-06-30 2018-05-08 三一重型能源装备有限公司 漂浮式自动平衡装置及测风平台
CN107200101A (zh) * 2017-05-25 2017-09-26 哈尔滨工程大学 一种浮式气垫支撑平台
CN108926876A (zh) * 2018-07-14 2018-12-04 中铁贵州工程有限公司 一种水厂斜管施工抗浮固定装置
CN111027263B (zh) * 2019-11-20 2024-03-08 天津大学 动水压力作用下多柱式结构附加质量系数的确定方法
CN114934967A (zh) * 2022-05-17 2022-08-23 广东省科学院智能制造研究所 一种空气弹簧减振装置及其应用

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR900773A (fr) * 1943-12-23 1945-07-09 Dispositif automatique permettant d'améliorer la tenue des vaisseaux à la mer
US2889795A (en) * 1956-07-09 1959-06-09 Jersey Prod Res Co Stabilization of a floating platform
US4582014A (en) * 1982-01-15 1986-04-15 Patel Minoo H E Vessel having stabilizing system
FR2681831A1 (fr) * 1991-09-26 1993-04-02 Elf Aquitaine Plate-forme petroliere flottante a pilonnement controlable.
US6021728A (en) * 1996-09-24 2000-02-08 Elf Exploration Production Buoyancy unit with controlled heave

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176614A (en) * 1976-10-20 1979-12-04 Seatek Corporation Control force tank and method for stabilizing floating vessels
US4864958A (en) * 1987-09-25 1989-09-12 Belinsky Sidney I Swap type floating platforms
US5525011A (en) * 1995-04-07 1996-06-11 San Tai International Corporation Semi-submerged movable modular offshore platform

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR900773A (fr) * 1943-12-23 1945-07-09 Dispositif automatique permettant d'améliorer la tenue des vaisseaux à la mer
US2889795A (en) * 1956-07-09 1959-06-09 Jersey Prod Res Co Stabilization of a floating platform
US4582014A (en) * 1982-01-15 1986-04-15 Patel Minoo H E Vessel having stabilizing system
FR2681831A1 (fr) * 1991-09-26 1993-04-02 Elf Aquitaine Plate-forme petroliere flottante a pilonnement controlable.
US6021728A (en) * 1996-09-24 2000-02-08 Elf Exploration Production Buoyancy unit with controlled heave

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2006052234A1 *

Also Published As

Publication number Publication date
CN1926023B (zh) 2011-05-11
CN1926023A (zh) 2007-03-07
AU2004324515A1 (en) 2006-06-22
BRPI0418958A (pt) 2007-12-04
AU2004324515B2 (en) 2009-10-22
EP1807302A4 (fr) 2011-09-21
AU2004324515B8 (en) 2009-11-19
BRPI0418958A8 (pt) 2018-01-02
AU2004324515A8 (en) 2008-10-02
WO2006052234A1 (fr) 2006-05-18

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