CN102292556A

CN102292556A - Vortex-induced vibration (VIV) suppression of riser arrays

Info

Publication number: CN102292556A
Application number: CN2009801551225A
Authority: CN
Inventors: D·W·艾伦; M·埃夫蒂米乌; D·L·亨宁; G·L·凯珀; L·李
Original assignee: Shell Internationale Research Maatschappij BV
Current assignee: Shell Internationale Research Maatschappij BV
Priority date: 2009-01-22
Filing date: 2009-12-17
Publication date: 2011-12-21
Also published as: AP2011005778A0; MX2011007271A; DK201170321A; CY1123074T1; WO2010085302A3; RU2011134832A; EP2379895A4; US20120006053A1; KR20110117096A; AU2009338154B2; EP2379895B1; WO2010085302A2; KR101721843B1; BRPI0924141A2; AP3188A; AU2009338154A1; EP2379895A2

Abstract

A system comprising an array of structures in a flowing fluid environment, the array comprising at least 3 structures; and vortex induced vibration suppression devices on at least 2 of the structures.

Description

The vortex-induced vibration of standpipe array (VIV) suppresses

Technical field

The present invention relates to be used to reduce the towing of a plurality of structures and/or the system and method for vortex-induced vibration (VIV).

Background technique

When standing incoming flow in the fluid environment that bluff bodies such as for example cylindrical body are flowing, bluff body may stand vortex-induced vibration (VIV).These vibrations can cause by acting on lip-deep vibration power, and describedly act on lip-deep vibration power and can cause that sizable vibration takes place structure, be under structural natural frequencies or the situation particularly near structural natural frequencies in the effect frequency.

The floating ship can be used for rock gas is liquefied and gasifies.Seawater can be used for cooling or heating rock gas.Because temperature contrast may be expected water inlet is separated with water outlet.A plurality of standpipes are used in apart from floating ship certain depth place and collect or deposit water.These standpipes may be exposed to VIV.

Make under water probing and mining apparatus be exposed to current from being present in subterranean deposit probing under the water body and/or recover petroleum etc., and may be exposed to VIV.The equipment that is exposed to VIV comprises following structure: the bigger cylindrical body under water from less pipe, anchoring chain bundle or the branch pipeline of riser systems to the hull of small-sized spar platform or spar platform FPS (hereinafter being called the spar platform).

Act on stress intensity on standpipe, chain bundle or the spar platform and may be basically function through the length of the water velocity of these structures and described structure, and with increasing through the water velocity of these structures and the length of described structure.

It should be noted, still can produce stress even act on the incoming flow of the medium speed in the fluid environment that flows on the linear structure.When big degree of depth place drills offshore oil gas in the inlet of ocean or near the river mouth or the ocean, may be easy to run into the incoming flow of so medium or more speed.

Usually exist two kinds of streams to swash stress in the fluid environment that flows.First kind of stress can be by this structure is caused along mainly swashing alternating force perpendicular to the whirlpool of the direction vibration (vortex-induced vibration) that comes flow path direction.When fluid was flowed through this structure, vortex can be from each top-cross of this structure for coming off.This produces the wave force transverse to incoming flow on this structure.If the big vibration transverse to incoming flow near one in the natural frequency of this structure, then may take place in the frequency of this harmonic load.These vibrations may cause unacceptable too short fatigue life, depend on the hardness and the intensity of this structure and any weld part.In fact, known have the stress that is produced by the high speed inlet flow conditions in the ocean environment for example to make structural break such as standpipe and fall the situation in seabed.

The stress of second type can be caused by drag force, because the resistance of structure fluid flow, described drag force is along coming flow path direction to promote this structure.Drag force can be strengthened by the vortex-induced vibration of this structure.For example, the standpipe that vibrates owing to vortex shedding will be usually than its current on every side of static bigger ground of standpipe disturbance.This can cause more energy always stream be delivered to standpipe, therefore and produce bigger effect of dragging.

Develop polytype device and reduced the vibration and/or the towing of submarine structure.Some of these devices that are used for reducing the vibration that submarine structure causes by vortex shedding are come work by wake flow is stablized.These methods comprise uses streamlined damping device, wake flow splitter and iris.

The device that is used to reduce the vibration that submarine structure causes by vortex shedding can be by changing around the boundary layer of flowing of this structure to prevent being associated work along the vortex shedding of this structure length.The example of such device comprises cannulated device, for example spiral side plate (strake), guard shield, damping device and columned basically sleeve pipe.

Slim-lined construction in wind or other streaming flows also may run into can with the VIV that compares and/or the towing that run in the water environment.Equally, workman that VIV and/or towing reduce device being installed arrives on the ground the side and extends that the far slim-lined construction with excessive VIV and/or drag force may be difficult to, cost is very high and danger close.

Damping device can be used for inhibitory action in the fluid environment that flows structural VIV and reduce towing.Damping device can be limited by the ratio of chord length and length, and wherein, the relatively shorter damping device of long damping device has higher ratio.Long damping device more effective aspect the opposing towing, still has unsettled risk than short damping device.It is lower that unsettled risk takes place short damping device, but may have higher drag force in the fluid environment that flows.

The 6th, 223, No. 672 U.S. Patent Publications a kind of ultrashort damping device, it is used for suppressing the vortex-induced vibration of columned basically ocean element.Described ultrashort damping device has front edge, and it is basically along being limited by the circular contour of ocean element at least about the distances of 270 degree around it; And has an a pair of side that given shape is arranged that leaves and converge at trailing edge from the circular contour of marine riser.The thickness of ultrashort damping device and the size of chord length make the ratio of string and thickness between about 1.20 and 1.10.The 6th, 223, No. 672 U. S. Patent is incorporated herein by reference with its full content.

The 3rd, 978, No. 804 U.S. Patent Publications a kind of structure that swims in the water body, a kind of being used for from the structure of underwater drilling or completion more specifically disclosed.Buoyant member is supported on water surface top with at least a portion of this structure.This structure is connected to anchoring piece in the water bottom by the leg member of series of parallel.Each leg member is made of the large diameter tube that a plurality of slender members for example are commonly referred to standpipe.These standpipes are parallel.The spacer element of vertical spacing is along the standpipe setting of every one leg, makes standpipe be maintained fixed the beat frequency that makes the intrinsic or resonant frequency of independent standpipe become and cause greater than by the motion through the water of standpipe apart from spacing and (2) with (1).The 3rd, 978, No. 804 U. S. Patent is incorporated herein by reference with its full content.

The 6th, 089, No. 022 U.S. Patent Publication a kind of system and method, it was used for before the rock gas transmission disembarkation of evaporation once more, LNG once more gasifies on cargo ship.When LNG is in its liquid phase, and before it flows through one or more vaporizers, the pressure of LNG is significantly increased, described one or more vaporizers are arranged on again on the described ship.From the seawater of the taking vaporizer of flowing through around the water body of described ship, become rock gas once more with heating and evaporation LNG, after this described rock gas is unloaded to shore facilities.The 6th, 089, No. 022 U. S. Patent is incorporated herein by reference with its full content.

The 6th, 832, No. 875 U.S. Patent Publications a kind of floating equipment that is used for LNG Liquefied natural gas, have the barge that is provided with liquefaction plant, the member that is used to receive the member of rock gas and is used to store and discharge LNG Liquefied natural gas.Described liquefaction plant relates to heat exchange, and wherein the heat of removing during LNG Liquefied natural gas is passed to water.Described barge also has container; Penstock with open-ended of inlet; Extend to the connecting duct of container from the outlet of penstock; Be used for from the pump and the drainage system that be used to discharge from the water of heat exchanger removal of container to the heat exchanger transporting water.Connecting duct has the inverted U shape, and its top is arranged on the container top.The 6th, 832, No. 875 U. S. Patent is incorporated herein by reference with its full content.

Exist the one or more needs in the following aspect in related domain: be used for reducing to act on the structural VIV of mobile fluid environment and/or the equipment and the method for towing, it does not have some shortcomings of prior art equipment and method; Be used for reducing to act on a plurality of structural VIV of mobile fluid environment and/or the equipment and the method for towing; The VIV that is used to reduce to act on the standpipe array or restraints and/or the equipment and the method for drag force.

Comprise this specification of its accompanying drawing and claims in reading after, these and other in related domain need and will become apparent those skilled in the art.

Summary of the invention

An aspect of of the present present invention provides a kind of system, and it comprises: the array of the structure in the fluid environment that flows, and described array comprises at least 3 structures; With the vortex-induced vibration suppression device in described structure at least 2.

Another aspect of the present invention provides a kind of method of vortex-induced vibration of the array that suppresses structure, be included in described structure 10% to 90% on vortex-induced vibration suppression device is installed.

Advantage of the present invention can comprise one or more in following: the VIV that has improved a plurality of structures reduces situation; The towing that has improved a plurality of structures reduces situation; The cost that the VIV that has reduced reduces; And/or utilize still less the VIV restraining device to realize that the VIV of a plurality of structures reduces.

Comprise this specification of accompanying drawing and claims in reading after, these and other aspects of the present invention will become apparent those skilled in the art.

Description of drawings

The accompanying drawing of can be with reference to following description and being used to illustrate the embodiment of the invention is expressly understood the present invention, in the accompanying drawing:

Fig. 1 illustrates the example that wherein can realize the marine systems of embodiments of the invention.

Fig. 2 A illustrates as the vertical view cutaway drawing of VIV restraining device along one or more representative side plates of the length installation of tubular structure.

Fig. 2 B illustrates as the vertical view cutaway drawing of VIV restraining device along the representative damping device of the length installation of tubular structure.

Fig. 3 A-3H illustrates being used for several different illustrative methods or the structure of VIV restraining device with an only subclass connection of tubular structure according to different embodiments.

Fig. 4 illustrates according to the illustrative methods of a plurality of tubular structures of one or more embodiments and structure, in described a plurality of tubular structures, at least two, has different external diameters at least three tubular structures in this example.

Fig. 5 illustrates illustrative methods that is similar to Fig. 4 and the structure according to one or more embodiments, and difference is that except different external diameters, a subclass of tubular structure also has the VIV restraining device that connects with it.

Fig. 6 A illustrates the example that wherein can realize the marine systems of embodiments of the invention, and described marine systems comprises floating LNG Liquefied natural gas (FLNG) equipment.

Fig. 6 B has shown the illustrative methods or the structure that are used for floating LNG Liquefied natural gas (FLNG) equipment according to a specific embodiment, and wherein nine tubular structures are arranged with 3 * 3 rectangular arrays.

Embodiment

In the following description, many details have been stated.But should understand, can not have to realize embodiments of the invention under the situation of these details.In other cases, smudgy in order not make to the understanding of this explanation, do not show known configurations and technology in detail.

Fig. 1

Fig. 1 illustrates the example of the marine systems 100 that wherein can realize embodiments of the invention.

Marine systems comprises for example surface structure 102 of ocean surface of the close water surface 104.For instance, surface structure can comprise steamer, barge, boats and ships, FPSO (Floating Production storage easing gear), TLP (tension leg platform (TLP)), spar platform, offshore rig, offshore platform, floating equipment, floating liquefied natural gas facility or other floating as known in the art or surface structure.

A plurality of tubular structures 106 connect with surface structure.A particular aspects, tubular structure can be used for providing cold water to cool off floating liquefied natural gas facility as surface structure at certain depth jointly.For instance, tubular structure can be connected to marine riser tension device, universal joint, spherical joint etc.In one embodiment, tubular structure has circle or oval cross section.In another embodiment, it is circular or oval-shaped that the cross section of tubular structure needs not to be, but can comprise other shapes, for example still is not limited to rectangle.

In the diagram of Fig. 1, can see two tubular structure 106A, 106B.Can randomly comprise a plurality of tubular structures, for example at least three, at least four, at least six, at least nine or more.The example of suitable tubular structure includes but not limited to cable, umbilical cables, standpipe, marine riser, riser pipe, pipe peculiar to vessel, delivery pipe, pipeline etc. or its combination.These structures can extend to seabed 108 always, or only partly extend to the seabed.In some cases, mud, crude oil, water and/or other fluids or electricity or electrical signal can pass through this structural transmission.

Tubular structure is by one or more interconnective guide thimbles or other spacer elements 110A, and the 110B physical connection is held in place together or relative to each other.Spacer element connects tubular structure or is held in place with array, bundle, group, other orderly arrangements or other set forms.For instance, spacer element can be included as metal, the plastics of plate-like, sheet, rectangle, interconnective polygonal bar, wheel and spoke shape or other shapes or have the material of sufficient intensity.Spacer element can have hole or other openings therein.One in the described tubular structure can be held or insert in hole or the opening each therein.Spacer element can help to manage together relatively near the maintenance of still turning up the soil at interval, so that mutual tempestuously bump of pipe or mutual destruction.One or more tubular structures can be used as the support structure of spacer element.The tubular structure that is used as the support structure of spacer element can (directly or indirectly) be connected to spacer element.For in the array or other tubular structures in groups, such tubular structure does not need to be connected to spacer element, and have at tubular structure under the situation of circle for example or elliptical shape, can have outer (outside) diameter (comprising or do not comprise the VIV restraining device) on the contrary less than the diameter of the opening in the spacer element.Perhaps, outer (outside) diameter (comprising or do not comprise the VIV restraining device) of tubular structure can be similar to the diameter of opening, contacts (for example press fit) so that the VIV restraining device on tubular structure or the tubular structure can be in spacer element.

It is not rare that tubular structure is arranged in the water with incoming flow 112.Incoming flow 112 can tend to produce the fluid dynamic towing and/or the vortex-induced vibration (VIV) of tubular structure.And in the array of the tubular structure that utilizes spacer element (for example spacer element 110A) to connect or be set together, the VIV that directly causes on the tubular structure of origin stream 112 in described array can be applied to other tubular structures of this array.Such VIV normally do not expect, and if do not suppress, may cause tubular structure damage, fatigue even premature failure.Therefore expect to reduce the VIV of tubular structure usually.

In certain embodiments, can use the VIV restraining device to help suppress VIV.The example that is applicable to the VIV restraining device of realizing embodiments of the invention or structure includes but not limited to the VIV restraining device or the structure of side plate, damping device, Henning device, guard shield, wake flow splitter and other types.

Suitable VIV restraining device is disclosed in the following file: the Application No. 10/839,781 of attorney docket TH1433; The Application No. 11/400,365 of attorney docket TH0541; The Application No. 11/419,964 of attorney docket TH2508; The Application No. 11/420,838 of attorney docket TH2876; The Application No. 60/781,846 of attorney docket TH2969; The Application No. 60/805,136 of attorney docket TH1500; The Application No. 60/866,968 of attorney docket TH3112; The Application No. 60/866,972 of attorney docket TH3190; U.S. Patent number 5,410,979; U.S. Patent number 5,410,979; U.S. Patent number 5,421,413; U.S. Patent number 6,179,524; U.S. Patent number 6,233,672; U.S. Patent number 6,561,734; U.S. Patent number 6,565,287; U.S. Patent number 6,571,878; U.S. Patent number 6,685,394; U.S. Patent number 6,702,026; U.S. Patent number 7,017,666; With U.S. Patent number 7,070,361, described patent document is incorporated herein by reference with its full content.

The suitable method that is used for installing the VIV restraining device is disclosed in the Application No. 10/784,536 of following file: attorney docket TH1853.04; The Application No. 10/848,547 of attorney docket TH2463; The Application No. 11/596,437 of attorney docket TH2900; The Application No. 11/468,690 of attorney docket TH2926; The Application No. 11/612,203 of attorney docket TH2875; The Application No. 60/806,882 of attorney docket TH2879; The Application No. 60/826,553 of attorney docket TH2842; U.S. Patent number 6,695,539; U.S. Patent number 6,928,709; With U.S. Patent number 6,994, in 492, described patent document is incorporated herein by reference with its full content.

The VIV restraining device can be installed in before or after tubular member is placed in the water body on the tubular member (for example buoyant material and standpipe).

The VIV restraining device can have the clam shell structure, and can be hinged with the close mechanism relative with articulated elements, and described close mechanism for example is can be by the mechanism of ROV operation.

The VIV restraining device can have copper coin in its end, so that it moves as weathercock together with the adjacent VIV restraining device or the collar.The VIV restraining device can partly be made of copper.

Fig. 2 A-2B

Fig. 2 A-2B has shown two common types of VIV restraining device or structure.In these devices or the structure each is applicable to and realizes one or more embodiments.

Fig. 2 A illustrates as the vertical view cutaway drawing of VIV restraining device along the one or more representative side plate 220 of the length installation of tubular structure 206.Described one or more side plate can be the spirality side plate, and it twines or reel around the tubular structure spiral, and can be described as and be connected to tubular structure.

Fig. 2 B illustrates as the VIV restraining device along the length of tubular structure 206 vertical view cutaway drawing of representative damping device 222 to be installed, and can be described as and be connected to tubular structure.Damping device has nose 224 and afterbody 226.Damping device can be according to the ocean incoming flow around the tubular structure rotation.

Referring again to Fig. 1, leftmost tubular structure 106A has and is connected to itself or the one or more restraining devices or the structure 114A that link together with it, 114B.Traditional collar (not shown) can be used for preventing that the VIV restraining device from moving along the length of described tubular structure.Rightmost tubular structure 106B does not have any VIV restraining device or structure that connects with it.

According to some embodiments, whole in a plurality of standpipes or other tubular structures or only a subclass can have the VIV restraining device that is connected to it.In the embodiment of these back classes, one or more other tubular structures in described a plurality of tubular structures can not have the VIV restraining device that is connected to it.

VIV restraining device some tubular structures from tubular structure are saved (thereby only tubular structure subclass has the VIV tubular structure) some possible advantages can be provided.On the one hand, on whole tubular structures, the VIV restraining device is set and tends to increase total equipment cost.On the other hand, compare with the tubular structure that does not have the VIV restraining device, it is more difficult usually, more consuming time and/or more expensive that the tubular structure with VIV restraining device is installed.The VIV restraining device may make usually that tubular structure is heavier, more unhandy, more difficult aligning and/or more difficultly connect with spacer element.Equally, regain tubular structure with VIV restraining device with for example clean, check and/or repair usually more difficult, more consuming time and/or more expensive.

Typically, about 20% to about 80% tubular structure can have the VIV restraining device that connects with it.Usually, about 30% to about 70% tubular structure can have the VIV restraining device that connects with it.In some cases, about 40% to about 60% tubular structure can have the VIV restraining device that connects with it.

And do not require that tubular structure has the VIV restraining device along its total length.In other words, coverage density (length that is coated with the tubular structure of VIV restraining device is compared with length overall) can be less than 1.Coverage density can also be expressed as the percentage of tubular structure length, and can be less than 100%.Usually, coverage density can arrive in about 100% the scope for example about 60% to about 90% about 50%.Quantity or percentage with tubular structure of VIV restraining device can reduce by the coverage density that increases the tubular structure of selecting.On the contrary, if desired, coverage density can recently reduce by quantity or the percentage that increase has a tubular structure of VIV restraining device.

Fig. 3 A-3H

Fig. 3 A-3H illustrates several different illustrative methods or the structure of the VIV restraining device that the tubular structure subclass of array, bundle, group or other set forms of different embodiment according to the subject invention and tubular structure connects.These figure illustrate the sectional view that passes spacer element 110A and described a plurality of tubular structure 106 along the hatching line 3/4/5 of Fig. 1.Spacer element is linked together tubular structure, or with array, bundle, group, other orderly arrangements or its set form that links described tubular structure relative to each other is held in place.

In these diagrams, circle is represented tubular structure.It will be appreciated that tubular structure does not need to occupy whole cross-section areas of the opening among the spacer element 110A.Shaded circles represents to have the tubular structure of the VIV restraining device that connects with it.The shadow-free circle represents not have the tubular structure of VIV restraining device.Though Fig. 3 A-3H has shown the different examples of the VIV restraining device that connects with the subclass (for example less than whole tubular structures) of tubular structure array, in another embodiment, the VIV restraining device can be connected to each of tubular structure in the array.Any above-mentioned VIV restraining device all is suitable.

Fig. 3 A-3F illustrates the method or the structure of nine tubular structures that are used to be arranged to 3 * 3 rectangular arrays, and in this particular case, described rectangular array is square array basically.

Fig. 3 A illustrates first structure according to an embodiment, wherein only has the VIV restraining device that is connected to it at the tubular structure of whole four corners of 3 * 3 rectangular arrays.

3 * 3 rectangular arrays have respectively the tubular structure at four

corner location

106A, 106C, 106G and 106I place.These corner locations are referred to herein as upper left corner 106A, upper right turning 106C, turning, lower-left 106G and turning, bottom right 106I.This array also has respectively the tubular structure at four side

central position

106B, 106D, 106F and 106H.These side central positions this paper is called upside 106B, downside 106H, right side 106F and left side 106D.Corner location and lateral location are combined to form the array periphery.3 * 3 rectangular arrays also have the tubular structure at central position 106E place.

Four tubular structures at four corner location places are only tubular structure with the VIV restraining device that is connected to it.These four tubular structures help to suppress VIV for whole array.Advantageously, this arrangement is solid, and does not demonstrate the ocean incoming flow angle that arrives very responsive.

Except suppressing VIV, the vortex shedding frequency with tubular structure of VIV restraining device is usually less than the tubular structure that does not have the VIV restraining device.In other words, for naked pipe shape structure, the VIV restraining device can tend to help the excitation frequency of the VIV of tubular structure " is detuned " or reduce.This can increase the frequency separation (disassociation) of array.These tubular structures with different frequency are with more impossible its vibration coupling that makes.As a result, can reduce the vibration of array.

Having the tubular structure of VIV restraining device scatters mutually basically with other tubular structures that do not have the VIV restraining device that connects with it, interlocks or otherwise stagger.In the array periphery, only has the VIV restraining device that is connected to it every one tubular structure.In such interlaced arrangement mode, adjacent tubular structure tends to have different excitation frequencies.As discussed above, by such frequency separation, the vibration that acts on these tubular structures more can not be coupled, and the global vibration of array can reduce.

In this structure, four about in other words 44% tubular structure in nine comprises the VIV restraining device that is connected to it.On periphery, in eight four in other words the tubular structure of 50% higher percentage have the VIV restraining device that is connected to it.

Fig. 3 B illustrates second structure according to an embodiment, and wherein only the tubular structure at the tubular structure of the center position of array and whole four corner location places has the VIV restraining device that is connected to it.This structure is similar to the structure of Fig. 3 A, and difference is that the tubular structure of center position also has the VIV restraining device that is connected to it.

As previously described, in this structure, the tubular structure with VIV restraining device is staggered with the tubular structure that does not have the VIV restraining device basically.As previously described, on periphery, only has the VIV restraining device every one tubular structure.Interlocking like this can tend to increase the frequency separation amount, and this also can help to reduce because the damage that VIV causes.

In this structure, in nine five, about in other words 55% tubular structure has the VIV restraining device that is connected to it.On periphery, in eight four, the tubular structure of 50% higher percentage has the VIV restraining device that is connected to it in other words.

Fig. 3 C illustrates the 3rd structure according to an exemplary embodiment, and wherein, only the tubular structure of four of array side center positions has the VIV restraining device that is connected to it.Because the tubular structure that is in the lateral location place rather than is in the corner location place has the VIV restraining device, therefore should structure the structure with Fig. 3 A is opposite basically.

In this structure, in nine four, about in other words 44% tubular structure has the VIV restraining device that is connected to it.On periphery, in eight four, the tubular structure of 50% higher percentage has the VIV restraining device that is connected to it in other words.

, can realize fully suppressing or damping when being mainly ocean, river or other streaming flow incoming flows when known by the tubular structure with VIV restraining device of low more quantity or percentage.Especially, in one or more embodiments, array can be arranged as the tubular structure with VIV restraining device that makes higher percentage and be in the face of on the front row of main ocean incoming flow.

Fig. 3 D illustrates the 4th structure according to an exemplary embodiment, and the tubular structure at three corner location places that wherein only is in the front row that will at first stand main ocean incoming flow of array has the VIV restraining device that is connected to it.This structure is similar to the structure of Fig. 3 A, and difference is that the tubular structure that is in corner location place, lower-left does not have the VIV restraining device.

Arrow is used to indicate main ocean incoming flow.When this paper used, term " mainly " ocean incoming flow was to comprise its general or the most general or modal ocean incoming flow of common direction.

Five tubular structures on array top side and right side constitute front-seat.Main ocean incoming flow is at first stood at this front row.

In this structure, in nine three, about in other words 33% tubular structure comprises the VIV restraining device that connects with it.On periphery, in eight three, the tubular structure of about in other words 37% higher percentage comprises the VIV restraining device.On the front row, in five three, about in other words 60% the tubular structure of more increasing percentage has the VIV restraining device.

It should be noted that compare with remaining non-front-seat tubular structure, the front-seat tubular structure of higher percentage has the VIV restraining device.These tubular structures at first stand main ocean incoming flow just, and will tend to stand to be in the ocean incoming flow of its maximum speed.These higher speed will tend to make these tubular structures to have the most serious VIV.But, on these front-seat tubular structures of higher percentage, use the VIV restraining device to tend to suppress most VIV.In addition, used the interlaced arrangement mode along the front row.This helps to increase the frequency separation amount.

And arrayed becomes to make the tubular structure that is in upper right corner location place at first stand main ocean incoming flow before every other tubular structure.This tubular structure will tend to stand to be in the ocean incoming flow of its maximum speed, and will tend to have a large amount of relatively VIV.But advantageously, this tubular structure has one or more VIV restraining devices.

Should also be noted that this arrangement is in the downstream of the wake flow of other upstreams or front-seat tubular structure and then or directly be provided with more tubular structure in wake flow.Wake flow refers to the zone by the separated flow in the mobile solid body downstream of causing of the fluid around the solid body, is turbulent flow in some cases.Average liquid speed tends to lower in the wake flow.As a result, these downstream tubular structures tend to stand the ocean incoming flow of less speed, and tend to have less VIV.In addition, in the wake flow of other tubular structures and the tubular structure that stands less speed incoming flow tend to have lower vortex shedding frequency and/or excitation frequency.The frequency separation that this increases array helps to reduce vibration.

Compare with Fig. 3 A, the tubular structure that is in position, the lower left corner does not have one or more VIV restraining devices.This tubular structure is in the downstream of several upstream tubular structures, and tends to stand to be in the ocean incoming flow that reduces relatively under the speed.This makes that it is the candidate that relatively preferably saves the VIV restraining device.Therefore, in one or more embodiments, can not have one or more VIV restraining devices with standing tubular structure main ocean incoming flow, after the every other tubular structure of array at last.

The expection employing has arrangement or the structure of more strengthening amount of suppression at the front row.Fig. 3 E illustrates the 5th structure according to an exemplary embodiment, and four tubular structures that wherein are in position on the front row that will at first stand main ocean incoming flow of array have the VIV device that is connected to it.

As previously described, arrow is used to indicate main ocean incoming flow.Arrayed becomes to make the tubular structure that is in position, the upper right corner at first stand main ocean incoming flow.This arrangement mode is arranged on more tubular structure in the wake flow of upstream tubular structure.

Five tubular structures on array top side and right side constitute the front row of at first standing main ocean incoming flow.In this embodiment, whole four tubular structures with VIV restraining device are positioned on the front row.

In this structure, in nine four, about in other words 44% tubular structure has the VIV restraining device.On periphery, in eight four in other words the tubular structure of 50% higher percentage have the VIV restraining device.On the front row, in five four, or 80% the tubular structure of more increasing percentage has the VIV restraining device.Therefore, in this embodiment or structure, compare with remaining non-front-seat tubular structure, the front-seat tubular structure of the percentage of more increasing has VIV and suppresses structure.

Fig. 3 F illustrates the 5th structure according to an exemplary embodiment, wherein on the array front row only three tubular structures of a tubular structure and front-seat downstream position have the VIV restraining device that is connected to it.This design relies on frequency separation more than the strong inhibition that relies on the front row.

Arrow indicates main ocean incoming flow.Five tubular structures on array top side and the right side constitute the front row of at first standing main ocean incoming flow.In this case, only the tubular structure with VIV restraining device is positioned on the front row.

This arrayed becomes to make the tubular structure that at first stands main ocean incoming flow that is in upper right corner location have the VIV restraining device that is connected to it.This arrangement mode also is arranged on more tubular structure in the wake flow of upstream tubular structure.It should be noted that the lower left quarter tubular structure that will stand main ocean incoming flow in the every other tubular structure back of array does not at last have the VIV restraining device.

In this structure, in nine four, about in other words 44% tubular structure has the VIV restraining device that is connected to it.On periphery, three about in other words 37% tubular structure in eight has the VIV restraining device.On the front row, in five one, 20% tubular structure has the VIV restraining device in other words.

Be not required for 3 * 3 rectangular arrays of Fig. 3 A-3F.In alternate embodiment, a plurality of tubular structures can have the tubular structure of other different quantity and/or other different shapes (for example circle, star, triangle etc.).

Fig. 3 G illustrates another representative configuration according to an exemplary embodiment, and it is used for 12 tubular structures with 4 * 3 rectangular arrays layout of 12 tubular structures.In this structure, front-seat abundant amount of suppression and the mixing of frequency separation amount have fully been utilized.

Arrow indicates main ocean incoming flow.Arrayed becomes to make and is in the tubular structure that having of position, the upper right corner be connected to its VIV restraining device and at first stands main ocean incoming flow.This arrangement mode also is provided with a plurality of tubular structures in the wake flow of upstream tubular structure.

And, in bigger relatively array,, tend to exist more substantial relatively natural frequency to separate owing to act on the disturbing effect and the wake effect of the tubular structure of bigger quantity.In addition, the tubular structure of less VIV inhibition can effectively reduce vibration.Therefore, in bigger relatively array, may use the relatively more tubular structure with VIV restraining device of smallest number or percentage than having a small amount of array usually to the moderate quatity pipe.For the array that has more than 12 standpipes, according to the particular implementation situation, even 20% or 25% tubular structure can have the VIV restraining device.

In this structure, in 12 six in other words 50% tubular structure have the VIV restraining device that is connected to it.On periphery, in 10 four in other words 40% tubular structure have the VIV restraining device.On the front row, two about in other words 33% tubular structure in six has the VIV restraining device.

Non-rectangular arrays also is suitable.Fig. 3 H illustrates another representative configuration with nine tubular structures of concentricity arranged in arrays of being used for according to an embodiment.In this case, concentricity array is circular.Perhaps, this array can be oval, avette, star shape, triangle etc.

Arrow is used to indicate main ocean incoming flow.This arranged in arrays becomes to make the tubular structure with the VIV restraining device that is connected to it at first stand main ocean incoming flow.

Tubular structure with restraining device is staggered with the tubular structure that does not have the VIV restraining device basically.As previously described, on periphery, only has the VIV restraining device every one tubular structure.

In this structure, in nine four, about in other words 44% tubular structure has the VIV restraining device that is connected to it.On periphery, in eight four in other words 50% tubular structure have the VIV restraining device.On the front row, in five three in other words 60% tubular structure have the VIV restraining device.

In any structure of Fig. 3 A-3H, the VIV restraining device may optionally be traditional, and can be used for the material structure of VIV restraining device by any suitable tradition.If desired, in one or more embodiments, the protection structure, for example cover, lid, vibration damper etc. can randomly be included on the VIV restraining device, to help prevent mechanical failure when bumping with the VIV restraining device or contacting.Described protection structure can be by pliable and tough, flexible or soft material, for example formations such as rubber, plastics, foam.On the one hand, the end of the section of VIV restraining device can randomly be tapered to the littler external diameter of external diameter than the remaining part of the section of restraining device, and this can be convenient to pass, and spacer element is installed and/or insertion.Typically, if having the opening that the tubular structure of the VIV restraining device that is mounted thereon passes in the spacer element inserts, if the end that described opening inserts of at first passing of restraining device is tapered to less external diameter, then tend to easier restraining device/tubular structure is aimed at and is inserted in the described opening with described opening.

In any structure of Fig. 3 A-3H, in one or more embodiments,, can randomly use the VIV restraining device of number of different types and/or size, but not use the VIV restraining device of a type and/or size though do not necessarily require.For example, have the VIV restraining device (for example side plate) of some the had first kind in the standpipe subclass of VIV restraining device, and other of subclass can have the second dissimilar VIV restraining device (for example damping device).A kind of strategy that uses dissimilar VIV restraining devices may be the frequency separation that changes the excitation frequency of standpipe and/or strengthen array.Dissimilar can randomly relative to each other interlocking is to provide further frequency separation.

The another kind of mode that reduces to vibrate is the tubular structure that has a plurality of various outer diameters by use.Therefore, other embodiments relate to a plurality of standpipes or other tubular structures, and wherein at least two standpipes or other tubular structures have various outer diameter.In one or more embodiments, at least three tubular structures can have different external diameters.

The diameter of tubular structure influences its vortex shedding frequency and VIV resonant frequency thereof.Especially, compare with the tubular structure with less hydraulic diameter, the tubular structure with relatively large hydraulic diameter tends to have lower vortex shedding frequency and lower excitation frequency.Therefore, in group, array, bundle or other connection set forms, comprise tubular structure, can help the vibration frequency of group, array, bundle or other set forms to be detuned by the frequency separation level that increases array with various outer diameter.

In addition, the upstream tubular structure has higher vortex shedding frequency than the downstream tubular structure that is in its wake flow usually.Therefore, when the tubular structure of relatively large diameter is in relatively tubular structure downstream than minor diameter, may produce bigger frequency separation usually.

In one or more embodiments, for main ocean incoming flow, the tubular structure with relatively large diameter can be in and have relatively than in the wake flow of the tubular structure of minor diameter or downstream.In one or more embodiments, for main ocean incoming flow, the average diameter of a plurality of upstream tubular structures can be less than the average diameter that is in a plurality of downstream tubular structures in its wake flow.

Typically, maximum diameter can be in big 5% to 200% the scope than minimum diameter (with the percentage expression of minimum diameter).Usually, maximum diameter can be in big 10% to 150% the scope than minimum diameter.In some instances, maximum diameter can be in big 25% to 100% the scope than minimum diameter.But this scope is not subjected to the restriction of any known diameter difference.

In one or more embodiments, epitheca or other coatings can be included on the tubular structure outside, to increase the external diameter of tubular structure.The term coating is not limited to the application method of similar paint etc., but contains the material that connects with the outside of tubular structure more widely.In one or more embodiments, the coating with multiple different-thickness can be included on the outside of different tubular structures, with the external diameter of increase tubular structure, and provides multiple different external diameter.Coating may be used for the purpose except increasing diameter.For example, coating can comprise heat insulator, so that the insulation of the fluid thermal in the tubular structure.As another example, coating can comprise buoyant material.

Fig. 4:

Fig. 4 illustrates according to the illustrative methods of a plurality of tubular structures of one or more embodiments or structure, and wherein, at least two, at least three tubular structures have different external diameters in this example.As previously described, this figure is the sectional view that passes spacer element 110 and a plurality of tubular structure 106 along the hatching line 3/4/5 of Fig. 1.

Be similar to Fig. 3 A-3F, nine tubular structures are arranged with 3 * 3 rectangular arrays.In this structure, the tubular structure 106E that is in center position has first external diameter with four

tubular structure

106A, 106C, 106G and 106I being in four corner location places.The tubular structure 106B that is in the upper center position has second external diameter with the tubular structure 106F that is in the right side center position.The tubular structure 106D that is in the left side center position has the 3rd external diameter with the tubular structure 106H that is in the downside center position.As shown in the figure, first external diameter can be less than second external diameter, and second external diameter can be less than the 3rd external diameter.If desired, one or more tubular structure can have another different with other three external diameters the footpath all round.

Arrow indicates main ocean incoming flow.Be in leftward position than large diameter tubular structure 106D in being in the downstream and wake flow than the tubular structure 106B of minor diameter at upper side position place.Equally, be in lower position than large diameter tubular structure 106H in being in the downstream and wake flow than the tubular structure 106F of minor diameter of right positions.The average diameter of upstream tubular structure (for example 106B, 106C and 106F) is less than the average diameter of the downstream tubular structure in its wake flow (for example 106D, 106H and 106G).

Fig. 5:

Also can with on a subclass of tubular structure, comprise the combined tubular structure that uses of VIV restraining device with different-diameter.Fig. 5 illustrates illustrative methods that is similar to Fig. 4 and the structure according to one or more embodiments, and difference is that except different external diameters, a subclass of tubular structure also has the VIV restraining device that is connected to it.

In one embodiment, shaded circles is the tubular structure with VIV restraining device.The representative of shadow-free circle does not have the tubular structure of VIV restraining device.

In another embodiment, shaded circles is not for having the tubular structure of restraining device.The representative of shadow-free circle has the tubular structure of VIV restraining device.

Different external diameters and this dual mode of VIV restraining device all can help to reduce vibration.Usually, for specific embodiment, the variation of external diameter is big more, and the quantity that fully reduces the required VIV restraining device of vibration (comprise and may not have vibration) is more little.Equally, for specific embodiment, the quantity of VIV restraining device is big more, and the variation that fully reduces the required external diameter of vibration (comprise and may not have vibration) is more little.

Scope of the present invention is not limited to the particular configuration shown in Fig. 4 and Fig. 5.Various other arrangements or structure will be conspicuous for those skilled in the art, and have beneficial effect of the present invention.

Tackle the method for vibration as another, the VIV inhibition is opposite with mainly carrying out, also expection by the following technical solutions: the array that main purpose is to increase damping, produces frequency separation or causes the device of different vortex shedding frequencies or structure can be tubular structure or other are associated or the part of articulation set form, perhaps with the array of tubular structure or other are associated or the articulation set form is connected.This can help to increase total inhibition of system.The example of such device comprises screw axis airfoil, axial non-helical fin and circumferential fins.In one or more embodiments, fin or other devices or structure can be flexible or comprise flexible material, so that damping further to be provided.In one or more embodiments, the coating of absorption marine growth (rather than suppressing marine growth) can be added the tubular structure outside to, to strengthen damping.

Other embodiments relate to and being associated or the assembly method of the tubular structure that is connected.A kind of assembly method can comprise that at first mounting structure supports tubular structure, and described support structure tubular structure has one or more coupled spacer elements.For example, in the rectangular array shown in Fig. 3 A-3F, central tubular structure (for example tubular structure 106E) can at first be connected to one or more spacer elements along the length (for example a plurality of sections length of support structure) of support structure.Then, one or more other tubular structures can be threaded, insert or otherwise introduce the opening that passes in the spacer element respectively.Described tubular structure can have the VIV restraining device that was connected to it before introducing described opening, or the VIV restraining device can connect afterwards.In one or more embodiments, in final assembly, some but be not whole tubular structures, or the tubular structure of a subclass has the VIV restraining device that is connected to it.In one or more embodiments, in final assembly, a plurality of tubular structures, at least three tubular structures have different external diameters in some cases.

Other embodiments relate to the method that suppresses vibration in the tubular structure that is connected or is associated.In one or more embodiments, only utilize the VIV restraining device that links to each other with the tubular structure of a subclass of link or be associated array or group to suppress to vibrate.In one or more embodiments, the tubular structure with multiple external diameter (for example at least three kinds of various outer diameters) can vibrate under a plurality of different frequencies.

Fig. 6 A and 6B:

Fig. 6 A illustrates the example of the marine systems 600 that wherein can realize embodiments of the invention.This marine systems is included on the surface, ocean 104/in floating LNG Liquefied natural gas (FLNG) equipment 602.FLNG equipment is a particular instance of surface structure.FLNG equipment can cool off and LNG Liquefied natural gas, perhaps heating and gasification LNG.One or more tubular structures in array that is connected with FLNG equipment 602 or the group can be used for supplying water from the ocean to FLNG equipment.Perhaps, the standpipe array can be used as rig standpipe array, exploitation standpipe array, TLP chain bundle etc.

In this embodiment, marine systems 600 comprises a plurality of tubular structures or standpipe 606 (for example nine tubular structures).Each standpipe has first end and second end.First end is connected to FLNG equipment.Second end extend into downwards in the ocean usually, but must not extend into the seabed.For instance, second end can have about 130 to 170 meters degree of depth, but this is not requirement.Because the ocean incoming flow, tubular structure 606 can be offset about 40 degree (not shown) from vertical direction.In order to adapt to such skew, but tubular structure 606 can by universal joint, spherical joint, standpipe suspension bracket or other can pivot or articulated coupling is connected with FLNG equipment.

Tubular structure 606 is with a plurality of guide thimbles or

spacer element

610A, 610B, 610C physical connection or link together.Spacer element can have opening, and the respective tubular structure in the tubular structure is passed described aperture arrangement.In one embodiment, can provide enough spacer elements to prevent that tubular structure from colliding each other.

In one embodiment, some or all in the tubular structure 606 can be used as into water standpipe.The water inlet standpipe can suck the cold water 640 that is in certain depth, and cold water upwards is transferred to FLNG equipment.Cold water can be imported in the heat exchanger of FLNG equipment, helps LNG Liquefied natural gas with cooled natural gas.Seawater from the heating of heat exchanger exit can be got back to the ocean in the surface discharging, or gets back to certain depth by different standpipes or one group of standpipe transmission.

If desired, filter can randomly be connected to each of bottom of tubular structure 606.Filter can help to prevent that soil, marine organisms (for example sea grass, marine alga, fish etc.) etc. from entering in the tubular structure.Filter may tend to pass in time and block.The common relative difficult of filter rinsed.For example, one or more tubular structures 606 are taken off so that filter can clean common cost height, labour intensive and/or consuming time from array.In one or more embodiments, take off tubular structure when not being each filter blocks, but can make array or group comprise redundant water inlet tubular structure (standpipe), thus can randomly comprise redundant water inlet tubular structure, so that sufficient water still can be provided after some filter blocks.On the one hand, can use this tubular structure, it can be taken off then, and the new tubular structure that will have a cleaning and filtering provides again and reaches the standard grade up to its filter blocks.On the other hand, the tubular structure with VIV restraining device can be not used in into water, and can not have filter, suppresses but can be mainly used in VIV, and does not have the naked pipe of VIV restraining device can have filter, and be used to into water.These naked pipe shape structures are tended to be easier to when its filter blocks regain.

Fig. 6 B has shown the illustrative methods or the structure that are used for nine tubular structures arranging with 3 * 3 rectangular arrays according to a specific embodiment.This figure is the sectional view that passes a plurality of tubular structures 606 along the hatching line 6B of Fig. 6 A.

This array has along eight tubular structures of periphery and is in the standpipe at center.Eight tubular structures along periphery can be used as into water standpipe, to provide cold water to FLNG equipment.The tubular structure of center is as the support structure structure (standpipe) of spacer element.Be in the center standpipe can to the surface transmit water or can be not to surface transmission water (promptly can be used as into water standpipe or can not as the water inlet standpipe).

In a particular embodiment, can have about 42 inches external diameter and about 1 inch wall thickness, and the support structure tubular structure that is in the center can have about 24 inches external diameter and about 0.75 inch wall thickness along eight tubular structures of periphery.Eight tubular structures along periphery can an about external diameter or about 42 inches opening apart from equi-spaced apart.For sufficient cooling water is provided to FLNG equipment 602, in one embodiment, can not need each tubular structure all to move at any time.Thereby one or more tubular structures can be used as redundant water inlet standpipe.

In this illustrative methods or structure, the tubular structure that only is in whole four corners of 3 * 3 rectangular arrays has connected VIV restraining device.Perhaps, can randomly use other arrangements disclosed herein or structure.

Example 1

On 3 * 3 scaled standpipe Array Model that have and do not have the spiral side plate, carry out the water tank test.When comprising the spiral side plate, the spiral side plate only is included on four turning standpipes of array.This structure is similar to shown in Fig. 3 A and constructs.This test and test result are summarised in the table 1.

Table 1

Tested different water temperatures.Velocity range relates to the flow velocity of incoming flow.Maximum effectively A/D refers to the largest motion amplitude (root-mean-square value) in the test speed scope, and is used for the metering vibration.Maximum square A/D is low more, and the vibratory output on the standpipe is low more.These results only show and comprise that the spiral side plate enough is used for significantly reducing VIV on four turning standpipes in nine standpipe arrays.

Scope of the present invention is not limited to realize that any known VIV suppresses or the specified quantitative of damping.The VIV inhibition or the damping amount that are fit to specific implementations may change very greatly to another kind of mode of execution from a kind of mode of execution.These may be partly owing to the vibration in the incoming flow of ocean, length of tube, structural material, super safety standard design flow etc.

In above-mentioned description for purpose of explanation, stated that many details provide the complete understanding to embodiment.But it will be apparent to one skilled in the art that and under the situation that does not have these details, to realize one or more other embodiments.Described specific embodiment is to the invention provides restriction, but for example explanation the present invention.The specific embodiment that scope of the present invention can't help to provide is above determined, but is only determined by following claims.In other cases, known configurations, device and operation show with the block diagram form or do not show details, to avoid the making understanding to this explanation smudgy.In appropriate circumstances, the terminal part of reference character or reference character repeats in the accompanying drawings, and to represent corresponding or similar element, it can randomly have similar characteristic.

Exemplary embodiment

In one embodiment, disclose a kind of system, it comprises: the array of the structure in the fluid environment that flows, and described array comprises at least 3 structures; With the vortex-induced vibration suppression device in described structure at least 2.In certain embodiments, this array of structures is arranged in water body.In certain embodiments, at least one end of this structure is connected to the floating ship.In certain embodiments, vortex-induced vibration suppression device be installed in this structure 20% to 80% on.In certain embodiments, vortex-induced vibration suppression device be installed in this structure 30% to 60% on.In certain embodiments, this structure is coupled to each other in a plurality of positions along the length of this structure.In certain embodiments, this array comprises at least one internal structure and a plurality of formation external structure around the periphery of described internal structure, wherein, vortex-induced vibration suppression device be installed in external structure 40% to 65% on.In certain embodiments, the fluid environment that flows comprises and mainly comes flow path direction, and wherein, the structure that at first runs into main incoming flow in the array comprises at least one vortex-induced vibration suppression device.In certain embodiments, this system also comprises the vortex-induced vibration suppression device that is selected from side plate and damping device.In certain embodiments, vortex-induced vibration suppression device comprises at least two kinds of dissimilar devices.In certain embodiments, this array comprises first structure and second structure, and the diameter of described first structure is bigger by 20% than described second structure at least.In certain embodiments, the fluid environment that flows comprises and mainly comes flow path direction, and wherein, and the structure that at first runs into main incoming flow in the array comprises the diameter than other structure little at least 15% in the array.In certain embodiments, this array comprises at least 6 structures.In certain embodiments, this structure comprises pipe, and each root pipe comprises and runs through the hole that it is used for conveyance fluid.

In one embodiment, a kind of method of vortex-induced vibration of the array that suppresses structure is disclosed, described method be included in described structure 10% to 90% on vortex-induced vibration suppression device is installed.In certain embodiments, described method also comprises a plurality of described structures is connected to each other.In certain embodiments, described method also comprises at least one the diameter that changes in the described structure, so that first structure has the diameter than second structure big at least 30%.

Should be further appreciated that for example " embodiment ", " embodiment " or the meanings such as " one or more embodiments " mentioned in whole this specification are the special characteristics that can comprise in enforcement of the present invention.Similarly, it will be appreciated that in description, sometimes in its single embodiment, among the figure or in the explanation with different characteristics combination together, to be used to make the disclosure to simplify and to help to understand different inventive concept schemes of the present invention.But this open method should not be construed as and is intended to the more feature that reflects that the present invention need be more expressed than each claim.On the contrary, reflect that inventive concept scheme of the present invention can comprise all features that are less than single disclosed embodiment as following claims.For example, unless otherwise indicated or statement, floating structure shown in the figure or floating liquid gas equipment also are not used in and constitute a part of the present invention.Thereby the claims after the embodiment are included in this embodiment part clearly at this, and each claim self is independent embodiment of the present invention independently.

Claims

1. system comprises:

The array of the structure in the fluid environment that flows, described array comprises at least 3 structures; With

Vortex-induced vibration suppression device at least 2 in described structure.

2. system according to claim 1, wherein, the array of described structure is in water body.

3. according to one among the claim 1-2 or multinomial described system, wherein, at least one end of described structure is connected to the floating ship.

4. according to one among the claim 1-3 or multinomial described system, wherein, described vortex-induced vibration suppression device be installed in described structure 20% to 80% on.

5. according to one among the claim 1-4 or multinomial described system, wherein, described vortex-induced vibration suppression device be installed in described structure 30% to 60% on.

6. according to one among the claim 1-5 or multinomial described system, wherein, described structure is coupled to each other in a plurality of positions along the length of described structure.

7. according to one among the claim 1-6 or multinomial described system, wherein, described array comprises at least one internal structure and forms a plurality of external structures of periphery around described internal structure, wherein, described vortex-induced vibration suppression device be installed in described external structure 40% to 65% on.

8. according to one among the claim 1-7 or multinomial described system, wherein said mobile fluid environment comprises and mainly comes flow path direction, and wherein, the structure that at first runs into main incoming flow in the described array comprises at least one vortex-induced vibration suppression device.

9. according to one among the claim 1-8 or multinomial described system, wherein, described vortex-induced vibration suppression device is selected from side plate and damping device.

10. according to one among the claim 1-9 or multinomial described system, wherein, described vortex-induced vibration suppression device comprises at least two kinds of dissimilar devices.

11. according to one among the claim 1-9 or multinomial described system, wherein, described array comprises first structure and second structure, described first structure has the diameter than described second structure big at least 20%.

12. according to one among the claim 1-11 or multinomial described system, wherein, described mobile fluid environment comprises and mainly comes flow path direction, and wherein, the structure that at first runs into main incoming flow in the described array comprises the diameter than other structure little at least 15% in the described array.

13. according to one among the claim 1-12 or multinomial described system, wherein, described array comprises at least 6 structures.

14. according to one among the claim 1-13 or multinomial described system, wherein, described structure comprises pipe, each pipe comprises the hole that is used for conveyance fluid of running through it.

15. the method for the vortex-induced vibration of an array that suppresses structure comprises:

Described structure 10% to 90% on vortex-induced vibration suppression device is installed.

16. method according to claim 15 also comprises a plurality of described structures are connected to each other.

17., also comprise at least one the diameter that changes in the described structure, so that first structure has the diameter than second structure big at least 30% according to one among the claim 15-16 or multinomial described method.

18. a system comprises:

The array of the structure in the fluid environment that flows, described array comprises at least 3 structures, wherein, described structure is coupled to each other in a plurality of positions along the length of described structure; With

Vortex-induced vibration suppression device at least 2 of described structure, and wherein, at least one in the described structure do not comprise vortex-induced vibration suppression device.

19. system according to claim 18, wherein, described vortex-induced vibration suppression device be installed in described structure 20% to 90% on.

20. according to one among the claim 18-19 or multinomial described system, wherein, described vortex-induced vibration suppression device be installed in described structure 40% to 70% on.