WO2011027949A1

WO2011027949A1 - Anti-rolling and pitching device of floating subject

Info

Publication number: WO2011027949A1
Application number: PCT/KR2009/007859
Authority: WO
Inventors: 서남표
Original assignee: 한국과학기술원
Priority date: 2009-09-03
Filing date: 2009-12-29
Publication date: 2011-03-10
Also published as: KR101159161B1; KR20110024681A

Abstract

The present invention relates to an anti-rolling and pitching device of a floating subject on the sea, the device comprising: a cage, which is mounted at the bottom surface of the floating subject in such a manner that the cage is opened up in a downward direction from the bottom surface of the floating subject to define a space of a certain size inside where fluid can be trapped; a plate, which is coupled to a lower end of the cage to help the opening movement of the cage and has at least one opening for guiding the inflow of fluid into the cage; and a drive unit for driving the plate up and down to allow the plate to extend and retract. As such, when the floating subject stays in one place, the plate moves downwards to open up the cage, thereby creating the space where fluids are trapped. As the floating subject rolls and pitches, the fluids having been temporarily trapped within the space of the cage contribute to increase a total mass of the floating subject so as to reduce the rolling of the floating subject.

Description

Fluctuation device of marine floating material

The present invention relates to a device for preventing the fluctuation of the sea floating material, and more particularly, to a device capable of preventing the fluctuation of the float during the anchoring of the sea floating material such as a mobile harbor (Mobile Harbor).

Floating Storage Regasfication Units (FSRUs) or Floating Production, Storage and Offloading (FPSO) ships or ships anchored at sea Marine structures, such as mobile harbors, which are moving ports, have large square coefficients and have a rectangular central section. These floating structures are subjected to up and down and lateral movements by the waves, and these phenomena affect the work performance and safety. Therefore, in order to increase the work efficiency and safety, the respective phenomena must be prevented or suppressed.

On the other hand, there is known a technique for suppressing the above-mentioned fluctuations, such as lateral fluctuations, including marine floating objects and ships. The most widely known is Bilge Keel. The bilge key is a plate-like member attached to the bilge part where the bottom and the side wall of the hull meet. Such bilge kiil generates a vortex when the ship rolls, thereby acting to attenuate the roll.

In addition, when the bilge kiil alone as described above does not sufficiently obtain the lateral attenuation damping effect, equipment such as a lateral attenuation damping tank or pin stabilizer is additionally installed. The damping tank uses a U-shaped water tank at the center of the ship to use the resonance phenomenon of the flow inside the water tank. Both passive and active type are used.

Here, the pin ballast is a lateral oscillation damping device that generates additional restoring force and damping force by generating lift on the pin by adjusting the angle of the pin according to lateral agitation by attaching the pin to the bilge.

However, the conventional shake attenuation schemes have a high additional cost during installation, and the shake is only partially attenuated, so that an apparatus for effectively attenuating and correcting the lateral fluctuations in the seafloor is required.

The present invention has been invented to solve the above problems, an object of the present invention is to provide an apparatus for preventing fluctuation of the marine flotation, which can prevent the lateral fluctuation by increasing the total mass of the marine flotation.

In order to achieve the above object, according to an aspect of the present invention, in the state that is installed on the bottom surface of the sea floating material and deployed downward from the bottom surface of the sea floating material to form a space of a predetermined size therein and confines the fluid; And a plate which is coupled to the lower end of the frame part to help unfold the frame part and has at least one hole formed therein for introducing fluid into the inside of the frame part, and a driving part which drives the plate up and down so that the frame part is unfolded or folded. Provide a device to prevent the fluctuation of the sea floating material.

The cage may have a cylindrical or polygonal pillar shape in a state of being unfolded downward to confine the fluid therein, and the cage may be made of a genius material.

In addition, a plurality of holes may be formed in the plate, and the plate may be formed in a lattice form.

The driving unit may include a wire connected to the plate, a winding unit for winding or unwinding the wire, and a motor for forward and reverse rotation driving of the winding unit.

An accommodating portion is formed on a bottom surface of the sea floating object, and when the sea floating object is operated, the cage and the plate may be stored in the accommodating portion.

According to the seafloat prevention device of the present invention, the bottom surface accommodating portion of the seafloat has a cloth-like edge portion and a plate joined to one end portion of the edge portion. By moving the cage outwards to create a constant space and confining the fluid within the space, the total mass of the marine float is increased by the fluid temporarily confined inside the cage when the marine float is agitated, so the lateral fluctuation of the marine float is increased. Is reduced.

1 and 2 is a partial side cross-sectional view of the apparatus for preventing fluctuation of the sea floating material according to an embodiment of the present invention,

3 is a perspective view of the apparatus for preventing fluctuation of the seafloor according to an embodiment of the present invention,

Figure 4 is a perspective view of the apparatus for preventing fluctuation of the sea floating material according to another embodiment of the present invention.

Hereinafter, one embodiment of the present invention will be described in more detail with reference to the accompanying drawings so that those skilled in the art can easily practice, but this is only an example, the present invention is limited thereto. It doesn't happen.

1 and 2 are a partial side cross-sectional view of the apparatus for preventing the shaking of the sea floe according to an embodiment of the present invention, Figure 3 is a perspective view of the apparatus for preventing the shaking of the sea floating according to an embodiment of the present invention, Figure 4 3 is a perspective view of an apparatus for preventing fluctuation of a seafloor according to another embodiment of the present invention.

As shown in FIG. 1 and FIG. 2, the apparatus for preventing fluctuation of the marine floating object of the present embodiment is largely provided at the lower end of the cage 110 and the cage 110 provided at the bottom of the marine float 100. Plate 120 and the drive unit to enable the unfolding and folding of the cage 110.

Here, the marine floating object 100 is a floating vessel that is anchored in the sea or a floating liquefied natural gas storage evaporation unit (FSRU: Floating Storage Regasfication Unit) or a natural gas storage and production line (FPSO: Floating Production) Storage and offloading) and mobile harbors.

The bottom surface of the marine relics 100 is formed with an accommodating part 102 that forms a predetermined space in which the confinement part 110 and the plate 120 are accommodated. Determined according to the size of the plate 120, it may be formed on most or part of the bottom surface of the marine relics 100. The plate 120 may be accommodated on or in the same surface as the bottom of the marine float 100 to minimize the resistance during operation of the marine float 100.

The edge portion 110 is fixed to the one end (top), for example, in the receiving portion 102, and forms a space of a predetermined size therein while being extended downward to trap the fluid from the bottom of the marine relic 100. It may be made of cloth or corrugated synthetic resin material, and in the case of cloth, it may be treated with a waterproof coating.

The cage 110 may have a cylindrical or polygonal (eg, rectangular) columnar shape to confine the fluid therein in a state of being unfolded downward.

Plate 120 is coupled to the lower end of the cage 110, the plate 120 freely falls by its own load to help the unfolding of the cage 110. The plate 120 may be made of metal or synthetic resin.

In the plate 120, a plurality of holes 122 are formed as shown in the embodiment of FIG. 3 so that fluid is introduced into the cage 110. Alternatively, as shown in FIG. 4, the plate 120-1 itself may be formed to have an opening in a lattice form.

In addition, the driving unit connected to the plates 120 and 120-1 to enable the unfolding and folding of the cage 110 is provided with a wire 130 connected to the plates 120 and 120-1 and a wire ( 130 includes a winding unit 132 for winding or unwinding, and a motor 134 for driving the winding unit 132 forward and reverse rotation.

A plurality of wires 130 may be installed to be connected to the plate 120, 120-1, for example, may be installed in a pair facing in the horizontal and vertical or diagonal direction, the winding 132 is in the form of a roller The wires 130 may be installed to correspond to the wires 130.

The motor 134 may be controlled through a control unit (not shown) installed in the marine relics 100.

Hereinafter, the operation of the apparatus for preventing fluctuation of the marine floating material having such a structure will be described.

Referring to FIG. 1, the wire 130 is wound around the winding part 132 so that resistance to propulsion force does not occur during the operation of the marine floating object 100, so that the cage 110 and the plate ( 120 and 120-1 are stored together. Accordingly, the plates 120, 120-1 are maintained on or approximately coplanar with the bottom surface of the seafloor 100.

On the other hand, when the marine floating object 100 is anchored or stayed in one place, the marine floating object 100 may cause fluctuation depending on the marine condition.

As a result, the wire 130 wound around the winding unit 132 is released by the operation of the motor 134, and the load and the release of the plates 120 and 120-1 are dropped by the wire 130. The edge of the material 110 is unfolded. (See FIG. 2).

The boundary portion 110 is unfolded in a circular or polygonal column shape according to its shape, and fluid, that is, seawater is introduced through the hole 122 of the plate 120 falling down or the plate 120-1 of the grid shape. Temporary confinement of the fluid inside the cage 110, thereby increasing the overall mass of the sea floating material 100, so that even if a shake occurs in the sea floating material 100 is not easily shaken transversely of the sea floating material 100 Can be prevented.

And again when the operation of the marine floating object 100, the motor 134 is driven in reverse rotation to wind the wire 130 through the winding portion 132, the cage 110 and the plate 120 (120-) 1) is pulled up and stored in the storage unit 102.

Therefore, in the present invention, while the maritime floating object 100 is moving, the plate (110) of the fabric material and the plate coupled to the end of the cage 110 to the housing portion 102 provided on the bottom of the maritime floating object 100 When 120 (120-1) is accommodated and the marine relics (100) stay in one place, the plate (120) (120-1) is moved downward so that the cage (110) is spread downward to create a constant space. By confining the fluid in the space, the transverse fluctuation can be significantly reduced by increasing the total mass of the seafloor through the fluid temporarily confined inside the cage 110 when the seafloat is shaken.

As described above as a specific embodiment of the apparatus for preventing the fluctuation of the sea floating material according to the present invention, this is merely an example, the present invention is not limited to this, and should be construed as having the broadest range in accordance with the basic idea disclosed herein. do. Those skilled in the art can easily change the material, size, etc. of each component according to the application field, and can be combined / substituted the disclosed embodiments to implement a pattern of a timeless shape, but this also does not depart from the scope of the present invention will be. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, it is apparent that such changes or modifications belong to the scope of the present invention.

Claims

It is installed on the bottom surface of the sea floating material and in a state unfolded downward from the bottom of the sea floating material to form a space of a certain size therein to confine the fluid,

A plate having at least one hole coupled to a lower end of the cage to help unfold the cage and introducing fluid into the cage;

A driving unit for driving the plate up and down to expand or collapse the cage portion

Shake prevention apparatus of the sea floating material comprising a.
The method of claim 1,

Wherein the cage is in the form of a cylindrical or polygonal column in the unfolded downwards to prevent the movement of the marine floating material that can confine the fluid therein.
The method according to claim 1 or 2,

The frame portion is a shake prevention device of the seafloor made of a cloth material.
The method of claim 1,

An apparatus for preventing fluctuation of the marine floating material in which a plurality of holes are formed on the plate.
The method of claim 1,

Wherein the plate is formed in a lattice form, the apparatus for preventing fluctuations of the sea floating.
The method of claim 1,

The driving unit

A wire connected to the plate,

A winding portion for winding or unwinding the wire;

An apparatus for preventing fluctuation of an offshore buoyant comprising a motor for driving the winding unit forward and reverse rotation.
The method of claim 1,

An accommodation portion is formed on the bottom surface of the sea floating material, and when the sea floating material is in operation, the confinement portion and the plate is prevented in the sea floating material is accommodated in the receiving portion.