WO2015099093A1 - 動揺低減装置及びこれを備えた浮体 - Google Patents
動揺低減装置及びこれを備えた浮体 Download PDFInfo
- Publication number
- WO2015099093A1 WO2015099093A1 PCT/JP2014/084422 JP2014084422W WO2015099093A1 WO 2015099093 A1 WO2015099093 A1 WO 2015099093A1 JP 2014084422 W JP2014084422 W JP 2014084422W WO 2015099093 A1 WO2015099093 A1 WO 2015099093A1
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- WIPO (PCT)
- Prior art keywords
- floating body
- plate portion
- reduction device
- main body
- floating
- Prior art date
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- 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
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
- B63B13/02—Ports for passing water through vessels' sides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/44—Bilge keels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
- B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
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- 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
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
- B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels
Definitions
- the present invention relates to a motion reduction device for reducing motion of a floating body and a floating body including the same.
- Patent Document 1 as a device for reducing the motion generated in the floating body, a motion reduction member is disposed in the lower part of the floating body main body via the connection member, and the motion reduction member is suspended within a predetermined distance from the seabed.
- An apparatus for lowering is described.
- Patent Document 2 describes a motion reduction device that provides a plate separated by a predetermined distance from the floating body main body at least on the wave side of the floating body main body floating on water, and forms a penetration portion between the plate and the floating main body. It is done.
- Patent Document 3 describes that a plate separated from the floating body main body by a predetermined distance is disposed in a direction in which the surface having the largest area is parallel to the water surface.
- Patent Document 1 By using the motion reduction device described in Patent Document 1, Patent Document 2 and Patent Document 3, the motion of the floating body can be reduced, but the device may become large or the motion reduction effect may be small. is there.
- the present invention solves the above-described problem, and an object of the present invention is to provide a motion reduction device capable of efficiently reducing the motion of the floating body main body with a simple structure, and a floating body including the same.
- the motion reduction device of the present invention is a motion reduction device of a floating body main body floating on water, and a plate portion disposed vertically below the floating body main body, and the plate portion A connecting portion for connecting the floating body and the floating body in a state in which water flows between the floating body and the plate portion, and an inner side from the outside of the floating body between the bottom of the floating body and The flow path of the water flow on the bottom surface of the floating body is faster than the direction from the inside to the outside of the floating body.
- the draft of the floating body main body is d
- the width of the surface having the largest area of the portion connected to the connection portion of the plate portion is b
- the distance between the floating body main body and the plate portion in the vertical direction is When s is used, it is preferable that 0.05 ⁇ b / d ⁇ 0.5 and 0.01 ⁇ s / d ⁇ 0.2.
- an angle between a plane in which the area of a portion of the plate portion connected to the connection portion is largest and a vertical direction be 0 ° or more and 90 ° or less.
- the width of the surface having the largest area of the portion connected to the connecting portion of the plate portion is b
- the surface perpendicular to the largest surface of the portion having the area connected to the connecting portion of the plate is Assuming that the angle formed by ⁇ is ⁇ , and the distance between the end face of the floating body and the end in the vertical direction above the plate portion in the horizontal direction is x0, it is preferable that 0 ⁇ x0 ⁇ b ⁇ sin ⁇ .
- the plate portion is connected to a first plate portion which is a portion connected to the connection portion and an end portion of the first plate portion on the lower side in the vertical direction, and the largest surface is parallel to the vertical direction
- h the length in the vertical direction of the largest surface of the second plate portion
- b the width of the surface of the first plate portion
- the plate portion partially overlaps with the floating body main body and not partially overlap when viewed from the vertical direction.
- the said board part contains the part in which the surface with the largest area is parallel to the bottom face of the said floating body main body.
- the said board part contains the part in which the surface with the largest area inclines with respect to the bottom face of the said floating body main body.
- the floating body of the present invention is characterized by having the motion reduction device according to any of the above and a floating body main body on which the motion reduction device is installed.
- the outer edge of a bottom face is formed by a plurality of sides, and the floating body main body is disposed on at least one of the plurality of sides.
- the said movement reduction apparatus is arrange
- an irreversible flow path can be formed between the floating body main body and the plate portion by the plate portion disposed below the bottom surface of the floating body main body.
- FIG. 1 is a top view showing a schematic configuration of a floating body according to the present embodiment.
- FIG. 2 is a cross-sectional view showing a schematic configuration of a floating body according to the present embodiment.
- FIG. 3 is an explanatory view for explaining the operation of the floating body motion reduction device.
- FIG. 4 is an explanatory view for explaining the operation of the floating body motion reduction device.
- FIG. 5 is sectional drawing which shows schematic structure of the floating body of other embodiment.
- FIG. 6 is a top view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 7 is a top view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 8 is a top view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 1 is a top view showing a schematic configuration of a floating body according to the present embodiment.
- FIG. 2 is a cross-sectional view showing a schematic configuration of a floating body according to the present embodiment.
- FIG. 9 is a top view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 10 is a top view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 11 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 12 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 13 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 14 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 15 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 16 is a cross-sectional view for explaining the operation of the motion reduction device of FIG.
- FIG. 17 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 18 is an enlarged view showing the floating reduction device of FIG. 17 in an enlarged manner.
- FIG. 19 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 20 is a cross-sectional view showing an example of the motion reduction device.
- FIG. 21 is a cross-sectional view showing an example of the motion reduction device.
- FIG. 22 is a cross-sectional view showing an example of the measurement result.
- FIG. 1 is a top view showing a schematic configuration of a floating body according to the present embodiment.
- FIG. 2 is a cross-sectional view showing a schematic configuration of a floating body according to the present embodiment.
- a floating body is a structure that floats on various types of water, such as a floating pier, a floating warehouse, a floating parking lot, a work boat, an oil production platform, and a base of an offshore wind turbine.
- the floating body 10 has a floating body 12 and a motion reduction device 14.
- the floating body 12 is a structure that floats on the water surface W.
- the outer surface of the floating body main body 12 is formed of a steel plate, and a space sealed inside is formed.
- the floating body main body 12 has a specific gravity smaller than that of water and floats on the water surface W by keeping the internal space filled with air.
- the floating body main body 12 may form the whole structure in the object whose specific gravity is lighter than water.
- the floating body main body 12 of the present embodiment is a rectangular parallelepiped whose bottom surface (surface on the lower side in the vertical direction) is rectangular.
- the motion reduction device 14 is provided at the outer edge of the floating body 12.
- the motion reduction device 14 comprises four reduction units 20.
- the four reduction units 20 are disposed on four sides of the bottom of the floating body 12 respectively.
- the reduction unit 20 has a plate portion 22 and a connection portion 24 that connects the plate portion 22 and the floating body main body 12.
- the plate portion 22 is a plate-like member in which the extending direction of the side of the bottom surface of the corresponding floating body body 12 is the longitudinal direction, and the surface (the surface) having the largest area is disposed parallel to the bottom surface of the floating body body 12 It is done.
- the plate portion 22 is disposed to cover substantially the entire area of the side of the bottom surface of the floating body 12. That is, the length in the longitudinal direction of the plate portion 22 is substantially the same as the side of the bottom surface of the floating body 12, and the plate portion 22 is disposed at the overlapping position in the extending direction of the side. Further, as shown in FIG.
- the plate portion 22 is disposed at a predetermined distance lower side than the bottom surface of the floating body 12 in the vertical direction.
- the plate portion 22 partially overlaps the floating body 12 and does not overlap the floating body 12 when viewed from the vertical direction. Become. That is, the plate portion 22 is disposed in the vicinity of the bottom surface of the floating body 12, and a part thereof protrudes from the floating body 12.
- connection portion 24 is a rod-like member, and fixes the plate portion 22 to the floating body main body 12.
- a plurality of connection portions 24 are provided in the extending direction of the side of the bottom surface of the float body 12, and the plate portions 22 are fixed to the float body 12 at a plurality of locations. In addition, there is a gap between the connection portion 24 and the connection portion 24.
- the motion reduction device 14 is configured as described above, and the plate portion 22 is fixed by the connection portion 24 in a state where there is a gap between the plate portion 22 and the floating body main body 12. Further, as described above, the plate portion 22 partially overlaps the floating body 12 when viewed from the vertical direction.
- FIG.3 and FIG.4 is explanatory drawing for demonstrating operation
- FIGS. 3 and 4 describe one reduction unit 20 among the plurality of reduction units 20, the other reduction units 20 also have the same function.
- the motion reduction device 14 In the floating body 10, as shown in FIG. 3, when a wave in the direction of pushing the floating body 12 collides with the floating body 12, the wave forcing moment 52 acts on the floating body 12. At this time, in the motion reduction device 14, a part of the water flow 54 moved by the pushing wave 50 becomes a water flow 56 passing between the plate portion 22 and the bottom surface of the floating body 12. The water flow 56 is a high-speed flow pushed out by the push wave 50, so that a region having a lower pressure than the other portion of the bottom surface is generated on the bottom surface near the plate portion 22 of the floating body 12. Thereby, the motion reduction device 14 generates a cancel force 58 in the vicinity of the reduction unit 20 on the surface on the push wave 50 side, which is a force in the direction to cancel the wave forcing moment 52. The motion reduction device 14 can reduce the force generated in the floating body 12 when the pushing wave 50 acts on the floating body 12 by generating the cancellation force 58.
- the resistance of the water flow from the float body 12 toward the plate 22 by the pulling wave 60 increases in the vicinity of the motion reduction device 14, and the bottom of the bottom of the float body 12 near the plate 22 An area where pressure increases more than that occurs.
- the motion reduction device 14 generates a canceling force 68 in the vicinity of the reduction unit 20 on the surface on the pulling wave 60 side, which is a force in the direction to cancel the wave forcing moment 62.
- the motion reduction device 14 can reduce the force generated in the floating body 12 when the pulling wave 60 acts on the floating body 12 by generating the cancellation force 68.
- the floating body 10 has a gap between it and the bottom surface of the floating body main body 12, and the bottom surface of the floating body main body 12 and the plate portion 22 can be provided by providing the plate portion 22 disposed so as to partially overlap when viewed from the vertical direction.
- the floating body 10 can make the apparatus attached to the floating body main body 12 small by being able to reduce a movement efficiently with the movement reduction apparatus 14. As shown in FIG.
- the motion reduction device 14 can reduce the motion of the floating body 12 by a simple structure in which the plate portion 22 is fixed by the connection portion 24. Thereby, the fluctuation of the floating body 12 can be effectively reduced with a simple structure.
- the motion reduction device 14 sets the region overlapping the floating body main body 12 of the plate portion 22 to an appropriate ratio, whereby the water flow 56 when the pushing wave 50 is generated and the water flow 64 when the pulling wave 60 is generated, 66 can be generated with an appropriate balance.
- the pulling wave 60 it is possible to make it difficult for the water flow to pass between the plate portion 22 and the bottom surface of the floating body main body 12, and the cancellation force 68 can be suitably generated.
- the motion reduction device 14 sets the distance between the plate portion 22 and the floating body main body 12 to an appropriate range, so that the water flow 56 when the pushing wave 50 is generated and the water flows 64, 66 when the pulling wave 60 is generated. It can be generated with the proper balance. Specifically, when the push wave 50 is generated, the compressed water flow 56 can be made a water flow with an appropriate speed, and when the pull wave 60 is generated, the space between the plate portion 22 and the bottom surface of the floating body 12 Can be difficult to pass through. That is, between the bottom surface of the floating body 12 and the plate portion 22, a flow path in which the flow of water is more likely to flow than the direction from the inside to the outside of the floating body 12 Can be formed.
- the direction from the outside to the inside of the floating body 12 is on the bottom of the floating body 12 (in the vicinity of the bottom) than the direction from the inside to the outer side of the floating body 12 Water flow is faster.
- the cancel forces 58 and 68 can be suitably generated, and the motion of the floating body 12 can be more reliably reduced.
- the floating body 10 and the motion reduction device 14 are not limited to the above embodiment.
- other embodiments which are modifications of the floating body 10 and the motion reduction device 14 will be described using FIGS. 5 to 10.
- symbol is attached
- FIG. 5 is sectional drawing which shows schematic structure of the floating body of other embodiment.
- the floating body 10a shown in FIG. 5 has a floating body body 12 and a motion reduction device 14a.
- the motion reduction device 14a has a plurality of reduction units 20a.
- the reduction unit 20 a has a plate portion 22 a and a plurality of connection portions 24.
- the surface having the largest area is inclined at a predetermined angle with respect to the bottom surface of the floating body 12.
- the plate portion 22a is inclined downward in the vertical direction as it is separated from the floating body 12 (the center of the floating body 12).
- a part of the plate portion 22 a overlaps the floating body main body 12, and a part does not overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- the motion reduction device 14 a can also form the same water flow as the plate portion 22 by inclining the plate portion 22 a with respect to the bottom surface of the floating body main body 12. Furthermore, the plate portion 22 a further inclines the plate portion 22 a downward in the vertical direction as it is separated from the floating body main body 12, thereby increasing the amount of water flowing between the plate portion 22 a and the floating body main body 12 at the pressing wave. It is possible to increase the resistance of the flow of water flowing between the plate portion 22a and the floating body 12 during pulling waves. Thereby, the fluctuation of the floating body 12 can be reduced.
- FIG. 6 is a top view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10b shown in FIG. 6 has a floating body body 12 and a motion reduction device 14b.
- the motion reduction device 14 b has two reduction units 20.
- the reduction unit 20 is provided only on two opposing sides of the four sides of the floating body main body 12.
- the motion reduction device 14b is not limited to being provided in the entire area of the outer edge of the floating body main body 12, but the motion reduction device 14b may be selectively provided among a plurality of sides. Further, in the modified example, two sides facing each other among the four sides are used, but two sides not facing each other as three sides or one side may be used.
- FIG. 7 is a top view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10c shown in FIG. 7 has a floating body body 12 and a motion reduction device 14c.
- the motion reduction device 14c has four reduction units 20c.
- the reduction unit 20c has a plurality of connection portions 24 connecting the two plate portions 22c, the plate portion 22c, and the floating body 12 to each other.
- the two plate portions 22 c are arranged in series along the side of the floating body 12. That is, the two plate portions 22 c are disposed overlapping with different positions of the side of the floating body 12.
- the plate portion 22 c partially overlaps the floating body main body 12, and does not partially overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- the floating body 10c can obtain the same effect as described above even if the plate portion 22c of the motion reduction device 14c disposed to one side of the floating body main body 12 is divided into a plurality. Moreover, although the board part of one reduction unit 20c was made into the two board parts 22c in the said modification, the number in particular of a board part is not limited.
- the reduction unit may have three or more plate portions.
- FIG. 8 is a top view showing a schematic configuration of a floating body according to another embodiment.
- a floating body 10d shown in FIG. 8 includes a floating body main body 12 and a motion reduction device 14d.
- the motion reduction device 14d has four reduction units 20d.
- the reduction unit 20d has a plurality of connection portions 24 that connect the plate portion 22d, the plate portion 22d, and the floating body main body 12.
- the plate portion 22 d is disposed along the side of the floating body 12. The length in the longitudinal direction of the plate portion 22 d is shorter than the side where the floating body main body 12 is installed. Therefore, the plate portion 22 d is disposed at a part of the side of the floating body 12 in the direction along the side of the floating body 12.
- the plate portion 22 d of this modification is disposed at a part including the center of the side of the floating body 12. A part of the plate portion 22 d overlaps the floating body main body 12, and a part does not overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- the floating body 10d can obtain the same effect as described above even if the plate portion 22d of the motion reduction device 14d disposed to one side of the floating body main body 12 is shorter than the floating body main body 12.
- the motion reduction device can set the cancellation force with respect to the wave forcing moment to a suitable magnitude by arranging the plate portion within an appropriate range with respect to the side of the floating body main body, thereby reducing the motion. it can.
- FIG. 9 is a top view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10e shown in FIG. 9 has a floating body main body 12a and a motion reduction device 14e.
- the floating body main body 12a is a cylindrical structure having a circular outer periphery when viewed from the vertical direction.
- the motion reduction device 14e has a reduction unit 20e disposed at a part of the circular outer edge of the bottom surface of the floating body 12a.
- two reduction units 20e are respectively disposed at opposing portions of the circular outer edge.
- the reduction unit 20e has a plate portion 22e having a shape (a fan shape) obtained by cutting a part of a ring, and a connection portion 24 for connecting the plate portion 22e and the floating body main body 12a.
- FIG. 10 is a top view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10f shown in FIG. 10 has a floating body main body 12b and a motion reduction device 14f.
- the floating body 12b is a polygonal prism-shaped structure whose outer periphery when viewed from the vertical direction is octagonal.
- the motion reduction device 14f includes a reduction unit 20f disposed on each of eight sides of the outer edge of the octagon of the bottom surface of the floating body 12b.
- the reduction unit 20f has a plurality of connection portions 24 that connect the plate portion 22f, the plate portion 22f, and the floating body main body 12b.
- the plate portion 22 f is disposed along the side of the floating body 12.
- the shape of the floating body main body which installs an oscillation reduction apparatus is not limited to the rectangular parallelepiped whose bottom face becomes a rectangle, It can apply to various shapes.
- FIG. 11 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10g shown in FIG. 11 has a floating body main body 12 and a motion reduction device 14g.
- the motion reduction device 14g has a plurality of reduction units 20g.
- the reduction unit 20 g has a plate portion 22 g and a plurality of connection portions 24.
- the plate portion 22 g is connected to the first plate portion 70 inclined at a predetermined angle with respect to the bottom surface of the floating body main body 12 and the end portion of the first plate portion 70 on the lower side in the vertical direction
- the surface with the largest area has a second plate portion 72 orthogonal to the bottom surface of the floating body 12. That is, in the plate portion 22g, two plates having different angles are connected.
- the first plate portion 70 is inclined downward in the vertical direction as it is separated from the floating body 12 (the center of the floating body 12) in a cross section orthogonal to the longitudinal direction. Moreover, a part of the plate portion 22 g overlaps the floating body main body 12, and a part does not overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- the motion reduction device 14g as the plate portion 22g, includes a first plate portion 70 inclined with respect to the bottom surface of the floating body 12 and a second plate extending in the vertical direction at the lower end of the second plate portion 70.
- the plate portion 22g inclines the first plate portion 70 in the downward direction in the vertical direction as it is separated from the floating body main body 12, thereby a water flow flowing between the plate portion 22g and the floating body main body 12 at the pressing wave.
- the number can be increased, and the resistance to the flow of water flowing between the plate portion 22g and the floating body main body 12 can be further increased during pulling waves. Thereby, the fluctuation of the floating body 12 can be reduced.
- the second plate portion 72 it is possible to further increase the resistance of the water flow flowing between the plate portion 22g and the floating body main body 12 at the time of pulling wave. Further, by combining the first plate portion 70 and the second plate portion 72, the size of the plate portion 22g can be smaller than that of the plate portion 22a.
- FIG. 12 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 10h shown in FIG. 12 has a floating body main body 12 and a motion reduction device 14h.
- the motion reduction device 14h has a plurality of reduction units 20h.
- the reduction unit 20 h has a plate portion 22 h and a plurality of connection portions 24.
- the reduction unit 20 h has the same structure as the reduction unit 20 a except that the reduction unit 20 a is moved to the center side of the floating body main body 12 and all the plate portions 22 h overlap the floating body main body 12.
- the motion reduction device 14 h can incline the plate portion 22 h with respect to the bottom surface of the floating body 12 even if all the plate portions 22 h overlap the floating body 12, and can form the same water flow as the plate 22. Furthermore, the motion reduction device 14h further inclines the plate portion 22h downward in the vertical direction as it is separated from the floating body main body 12 to make the water flow between the plate portion 22h and the floating body main body 12 more It is possible to increase the resistance of the water flow flowing between the plate portion 22h and the floating body 12 during pulling waves. Thereby, the fluctuation of the floating body 12 can be reduced. Further, the motion reduction device 14 h can contact floating objects 80 such as a vessel (ship) and a floating body to the floating body main body 12 by arranging all the plate portions 22 h to overlap the floating body main body 12.
- floating objects 80 such as a vessel (ship)
- the motion reduction device may form an irreversible flow path, and as in the above embodiment, all the plate portions may be arranged to overlap the floating body main body 12, but a part of the plate portions overlaps the floating body main body 12. By arranging the parts so as not to overlap with the floating body main body 12, the fluctuation reduction effect can be further increased.
- FIG. 13 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- a floating body 10i shown in FIG. 13 has a floating body main body 12 and a motion reduction device 14i.
- the motion reduction device 14i has a plurality of reduction units 20i.
- the reduction unit 20i has a plate portion 22i and a plurality of connection portions 24.
- the first plate portion 90 having the largest area is orthogonal to the bottom surface of the floating body 12 and the second plate having the largest area parallel to the bottom surface of the floating body 12 And 92.
- two plates having different angles are connected.
- a connection portion between the first plate portion 90 and the second plate portion 92 is connected to the connection portion 24.
- the first plate portion 90 is connected to the connecting portion 24 at the upper end in the extending vertical direction.
- the second plate portion 92 is connected to the connection portion 24 at the end on the center side of the floating body main body 12.
- a portion of the plate portion 22i overlaps the floating body main body 12, and a portion does not overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- all of the first plate portion 90 overlaps the floating body 12.
- a part of the second plate part 92 overlaps the floating body main body 12 and a part does not overlap the floating body main body 12.
- the motion reduction device 14i may also be provided with a first plate portion 90 orthogonal to the bottom surface of the floating body 12 and a second plate portion 92 parallel to the bottom surface of the floating body 12 as the plate portion 22i. It is possible to form a stream similar to 22. Furthermore, the resistance of the water flowing into the space between the plate portion 22i and the floating body 12 can be further increased by the first plate portion 90 at the time of pulling wave.
- FIG. 14 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- a floating body 10j shown in FIG. 14 has a floating body main body 12 and a motion reduction device 14j.
- the motion reduction device 14j has a plurality of reduction units 20j.
- the reduction unit 20 j has a plate portion 22 j and a plurality of connection portions 24.
- the surface having the largest area is connected to the first plate portion 94 orthogonal to the bottom surface of the floating body 12 and the lower end of the first plate portion 94 in the vertical direction.
- a second plate portion 96 parallel to the bottom surface of the floating body 12. That is, in the plate portion 22j, two plates having different angles are connected.
- the second plate portion 96 is connected to the first plate portion 94 at an end portion on the center side of the floating body 12.
- the first plate portion 94 is inclined downward in the vertical direction as it is separated from the floating body 12 (the center of the floating body 12) in a cross section orthogonal to the longitudinal direction. More specifically, the first plate portion 94 extends in a direction perpendicular to the bottom surface of the floating body 12.
- a part of the plate portion 22 j overlaps the floating body main body 12, and a part does not overlap the floating body main body 12. This point is the same as that of the plate portion 22.
- the first plate portion 94 entirely overlaps the floating body 12.
- the second plate 96 partially overlaps the floating body 12 and does not partially overlap the floating body 12.
- the motion reduction device 14j may also be provided with a first plate portion 94 orthogonal to the bottom surface of the floating body 12 and a second plate portion 96 parallel to the bottom surface of the floating body 12 as the plate portion 22j. It is possible to form a stream similar to 22. Furthermore, the resistance of the water flow flowing between the plate portion 22 j and the floating body main body 12 can be further increased by the first plate portion 94 at the time of pulling wave.
- the plate portion may be any shape as long as an irreversible flow path can be formed, and plate members having various angles can be combined with the bottom surface of the floating body 12. Moreover, several board parts from which an angle differs can also be combined.
- FIG. 15 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 16 is a cross-sectional view for explaining the operation of the motion reduction device of FIG.
- the floating body 10k shown in FIG. 15 has a floating body body 12 and a motion reduction device 14k.
- the motion reduction device 14k has a plurality of reduction units 20k.
- the reduction unit 20 k has a flow path 101 and rotating parts 102 and 104.
- an opening is formed in the side surface of the floating body main body 12 and the bottom surface of the floating body main body 12, and the side surface of the floating body main body 12 and the bottom surface of the floating body main body 12 are connected.
- the flow path area of the flow path 101 becomes narrower as it goes from the side surface of the floating body main body 12 to the bottom surface of the floating body main body 12.
- the rotating portion 102 is provided in the vicinity of the opening of the side surface of the floating body main body 12 of the flow channel 101.
- the pivoting portion 102 pivots the plate-like member with the lower side in the vertical direction of the opening as a base point.
- the pivoting portion 102 opens the flow path 101 by arranging the plate-like members in the horizontal direction, and closes the flow path 101 by arranging the plate-like members in the vertical direction.
- the rotating portion 104 is provided in the vicinity of the opening of the bottom surface of the floating body 12 of the flow channel 101.
- the pivoting portion 104 pivots the plate-like member around the end of the opening body near the end of the floating body 12.
- the pivoting portion 104 closes the flow path 101 by arranging the plate-like members in the horizontal direction, and opens the flow path 101 by arranging the plate-like members in the vertical direction.
- the flow path 101 is an irreversible flow path in which the water flow can easily pass when the push wave and the water flow can not easily pass when the pull wave.
- forming the flow path in the floating body 12 can also form the same water flow as the motion reduction device 14.
- the flow path 101 makes the flow area faster at the time of pushing waves, and becomes more difficult at the time of pulling waves by narrowing the flow area from the side surface of the floating body main body 12 toward the bottom surface of the floating body main body 12 . This can further reduce shaking.
- the plate-like members of the pivoting portions 102 and 104 serve as fins for guiding the water flow. Furthermore, the motion reduction device 14k can open and close the flow path 101 by the rotating parts 102 and 104. Thereby, when the floating body 10k does not need to reduce the movement, for example, when moving (navigation) to install the floating body 10k at the destination, the flow path 101 is blocked by the rotating portions 102 and 104. , Resistance during movement can be reduced.
- FIG. 17 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- FIG. 18 is an enlarged view showing the floating reduction device of FIG. 17 in an enlarged manner.
- the floating body 110 shown in FIG. 17 and FIG. 18 has a floating body 12 and a motion reduction device 114.
- the motion reduction device 114 comprises a reduction unit 120.
- the reduction unit 120 is disposed on one side of the bottom surface of the floating body 12.
- the reduction unit 120 has a plate portion 122 and a plurality of connection portions 124.
- the plate portion 122 is a plate in which the direction of the side (outer edge) of the floating body main 12 disposed is the longitudinal direction, as in the above embodiment.
- the upper end of the plate portion 122 in the vertical direction is connected to the connection portion 124.
- a plurality of connection portions 124 are arranged at intervals in the direction of the side (outer edge) of the floating body 12 being arranged.
- the connection portion 124 is fixed to the plate portion 122 and the floating body main body 12, and fixes the plate portion 122 to the floating body main body 12.
- the plate portion 122 is formed by connecting two plates having different angles. Specifically, the plate portion 122 is a first plate portion 130 whose upper end in the vertical direction is connected to the connection portion 124 and a second plate which is connected to the lower end portion of the first plate portion 130 in the vertical direction And a part 132.
- the surface having the largest area is inclined at a predetermined angle with respect to the bottom surface of the floating body 12.
- the surface having the largest area is orthogonal to the bottom surface of the floating body 12.
- the first plate portion 130 is inclined downward in the vertical direction as it is separated from the floating body 12 (the center of the floating body 12) in a cross section orthogonal to the longitudinal direction.
- the plate portion 122 partially overlaps the floating body main body 12 and does not partially overlap the floating body main body 12.
- the motion reduction device 114 includes, as the plate portion 122, a first plate portion 130 inclined with respect to the bottom surface of the floating body 12 and a second plate vertically extended to an end portion of the first plate portion 130 below in the vertical direction. By providing the portion 132, the same water flow as the plate portion 122 can be formed. In addition, the motion reduction device 114 can obtain the same effect as the motion reduction device 14g.
- the motion reduction device 114 sets the draft of the floating body 12 which is the distance from the water line set to the floating body 12 to the lower end (that is, the bottom surface) of the floating body 12 in the vertical direction to d.
- the width of the surface having the largest area of the portion connected to the connection portion 124 of the plate portion 122 is b, which is the length of the largest surface in the surface orthogonal to the direction of the side (outer edge) of 12 It is preferable that 0.05 ⁇ b / d ⁇ 0.5.
- the motion reduction device 114 when the width of the surface having the largest area of the portion connected to the connection portion 124 of the plate portion 122 is the first plate portion 130 and the second plate portion 132 having different angles as in the motion reduction device 114 , And the width of the first plate portion 130.
- the motion reduction device 114 it is preferable that the motion reduction device 114 satisfy 0.01 ⁇ s / d ⁇ 0.2, where s represents the distance between the floating body main body 12 and the plate portion 122 in the vertical direction.
- the range in which water passes between the floating body 12 and the plate portion 122 can be set to an appropriate size.
- a stream of water passing around can be formed to the desired stream of water.
- the motion reduction device 114 sets the angle ⁇ between the surface having the largest area of the first plate portion 130 which is a portion connected to the connection portion 124 of the plate portion 122 and the vertical direction to 0 ° or more and 90 ° or less It is preferable to do.
- the water flow passing between the plate portion 122 and the floating body 12 can be made a desired water flow. That is, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow flowing above the bottom surface of the floating body is faster when pushing waves, and the water flowing above the bottom surface of the floating body is more when pulling waves. It becomes difficult to flow. This can further reduce shaking.
- the plate portion 122 When the distance between the end face of the floating body 12 and the upper end in the vertical direction of the plate portion 122 in the horizontal direction is x0, it is preferable that 0 ⁇ x0 ⁇ b ⁇ sin ⁇ . That is, in the present embodiment, when x0 is made larger than 0 and viewed from the vertical direction, the plate portion 122 partially overlaps the floating body 12 and does not partially overlap, but x0 is set to 0, When viewed from the vertical direction, the plate portion 122 may be in contact with the floating body 12.
- the water flow passing between the plate portion 122 and the floating body main body 12 can be made a desired water flow. That is, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, and on the bottom surface of the floating body 12 (while the bottom surface of the floating body 12 and the plate portion 122 Water flow is faster, and it is more difficult for the water flow to flow on the bottom of the floating body 12 during pulling waves. This can further reduce shaking.
- the motion reduction device 114 When the length (height) in the vertical direction of the largest surface of the second plate portion 132 is h, the motion reduction device 114 preferably satisfies 0 ⁇ h / b ⁇ 1.
- the water flow passing between the plate portion 122 and the floating body 12 can be made a desired water flow. That is, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow flowing above the bottom surface of the floating body is faster when pushing waves, and the water flowing above the bottom surface of the floating body is more when pulling waves. It becomes difficult to flow. This can further reduce shaking.
- the shape may be Also in this case, the water flow passing between the plate portion 122 and the floating body 12 can be made a desired water flow. That is, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow flowing above the bottom surface of the floating body is faster when pushing waves, and the water flowing above the bottom surface of the floating body is more when pulling waves. It becomes difficult to flow. This can further reduce shaking.
- the relationship between the width b and the length h is preferably 0 ⁇ h / b ⁇ 1.
- FIG. 19 is a cross-sectional view showing a schematic configuration of a floating body according to another embodiment.
- the floating body 160 shown in FIG. 19 has a floating body body 112 and a peristaltic reduction device 162.
- the motion reduction device 162 arranges the reduction unit 120 on each of two opposing sides of the bottom surface (outer edge) of the floating body main body 112.
- the reduction unit 120 may be disposed on each of the two opposing sides of the outer edge of the floating body 112.
- FIGS. 20 to 22 are cross-sectional views showing an example of the motion reduction device.
- FIG. 22 is a cross-sectional view showing an example of the measurement result.
- measurement was performed on Example 1 and Example 2 having the motion reduction device of the present embodiment.
- it measured also in the case where it does not equip with a motion reduction apparatus, ie, it has only a floating body main body, for comparison.
- Example 1 the measurement was performed with the floating body 110a shown in FIG.
- the floating body 110a shown in FIG. 20 has a motion reduction device 114a.
- the motion reduction device 114a has a reduction unit 120a.
- the reduction unit 120 a has a plate portion 122 a and a plurality of connection portions 124.
- the plate portion 122a has a first plate portion 130a and a second plate portion 132a.
- the plate portion 122a has the above-described distance x0 of 0 and an angle ⁇ of less than 90 °. That is, the first plate portion 130a is inclined with respect to the horizontal direction (the bottom surface of the floating body 12).
- the motion reduction device 114a has a preferable range of 0.05 ⁇ b / d ⁇ 0.5, 0.01 ⁇ s / d ⁇ 0.2, 0 ° ⁇ ⁇ ⁇ 90 °, and 0 ⁇ x0 ⁇ 0. All of b ⁇ sin ⁇ and 0 ⁇ h / b ⁇ 1 are satisfied.
- a plurality of connection portions 124 a are arranged at intervals in the direction of the side (outer edge) of the floating body 12 that is disposed. The connection portion 124 a is fixed to the plate portion 122 a and the floating body main body 12, and fixes the plate portion 122 a to the floating body main body 12.
- Example 2 the measurement was performed with the floating body 110b shown in FIG.
- the floating body 110b shown in FIG. 21 has a motion reduction device 114b.
- the motion reduction device 114b has a reduction unit 120b.
- the reduction unit 120 b has a plate portion 122 b and a plurality of connection portions 124.
- the plate portion 122 b is formed of a single plate. That is, the second plate portion is not provided.
- the distance x0 described above is larger than 0 and the angle ⁇ is less than 90 °.
- the length h is zero.
- the motion reduction device 114b of the above-mentioned shape has a preferable range of 0.05 ⁇ b / d ⁇ 0.5, 0.01 ⁇ s / d ⁇ 0.2, 0 ° ⁇ ⁇ ⁇ 90 °, 0 ⁇ x0 in the above-mentioned preferable range. All of ⁇ b ⁇ sin ⁇ and 0 ⁇ h / b ⁇ 1 are satisfied.
- a plurality of connection portions 124 b are arranged at intervals in the direction of the side (outer edge) of the floating body 12 being arranged. The connection portion 124 b is fixed to the plate portion 122 b and the floating body main body 12, and fixes the plate portion 122 b to the floating body main body 12.
- the floating bodies of Examples 1 and 2 and Comparative Example were floated on the water surface, and the amplitude of the tilt (roll angle) generated in the floating body main body when waves were generated was measured.
- the measurement results are shown in FIG. FIG. 22 shows the result of the regular wave test, and shows the difference in the amplitude depending on the presence or absence of the device in the wave period in which the floating body roll angle becomes large. As shown in FIG. 22, it can be seen that the floating bodies of Examples 1 and 2 can reduce the motion of the floating body.
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Abstract
Description
12 浮体本体
14 動揺低減装置
20 低減ユニット
22 板部
24 接続部
W 水面
Claims (11)
- 水上に浮遊する浮体本体の動揺低減装置であって、
前記浮体本体の鉛直方向下側に配置された板部と、
前記板部と前記浮体本体とを、前記浮体本体と前記板部との間に水が流れる状態で接続する接続部と、を有し、
前記浮体本体の底面との間に、前記浮体本体の外側から内側の方向が、前記浮体本体の内側から外側の方向よりも前記浮体本体の底面上の水流が速くなる流路を形成することを特徴とする動揺低減装置。 - 前記浮体本体の喫水をdとし、前記板部の前記接続部と接続している部分の面積が最も大きい面の幅をbとし、垂直方向における前記浮体本体と前記板部との距離をsとした場合、0.05≦b/d≦0.5であり、かつ、0.01≦s/d≦0.2であることを特徴とする請求項1に記載の動揺低減装置。
- 前記板部は、前記板部の前記接続部と接続している部分の面積が最も大きい面と垂直方向とのなす角が0°以上90°以下であることを特徴とする請求項1または2に記載の動揺低減装置。
- 前記板部の前記接続部と接続している部分の面積が最も大きい面の幅をbとし、前記板部の前記接続部と接続している部分の面積が最も大きい面と垂直方向とのなす角をθとし、水平方向における前記浮体本体の端面と前記板部の鉛直方向上側の端部との距離をx0とした場合、0≦x0≦b×sinθであることを特徴とする請求項1から3のいずれか一項に記載の動揺低減装置。
- 前記板部は、前記接続部と接続している部分である第1板部と、前記第1板部の鉛直方向下側の端部に接続され、最も大きい面が鉛直方向と平行となる第2板部と、を有し、
前記第2板部の最も大きい面の鉛直方向の長さをhとし、前記第1板部の面積が最も大きい面の幅をbとした場合、0<h/b≦1であることを特徴とする請求項1から4のいずれか一項に記載の動揺低減装置。 - 前記板部は、鉛直方向から見た場合、前記浮体本体と一部が重なり、一部が重ならないことを特徴とする請求項1から5のいずれか一項に記載の動揺低減装置。
- 前記板部は、面積が最も大きい面が、前記浮体本体の底面と平行である部分を含むことを特徴とする請求項1から6のいずれか一項に記載の動揺低減装置。
- 前記板部は、面積が最も大きい面が、前記浮体本体の底面に対して傾斜している部分を含むことを特徴とする請求項1から6のいずれか一項に記載の動揺低減装置。
- 請求項1から8のいずれか一項に記載の動揺低減装置と、
前記動揺低減装置が設置された浮体本体と、を有することを特徴とする浮体。 - 前記浮体本体は、底面の外縁が複数の辺で形成され、
複数の前記辺のうち、少なくとも1辺に配置されていることを特徴とする請求項9に記載の浮体。 - 前記動揺低減装置は、前記浮体本体の外縁の全域に配置されていることを特徴とする請求項9に記載の浮体。
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CN201480064330.5A CN105764790B (zh) | 2013-12-27 | 2014-12-25 | 摇动减少装置及具备该摇动减少装置的浮体 |
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WO2019011407A1 (en) * | 2017-07-10 | 2019-01-17 | Cefront Technology As | SHIP AT SEA FOR THE PRODUCTION AND STORAGE OF HYDROCARBONS |
JP2019521905A (ja) * | 2016-07-26 | 2019-08-08 | イエフペ エネルジ ヌヴェルIfp Energies Nouvelles | フロート及び深さとともに変化する断面を有する減衰板を有する浮体式支持構造体 |
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CN113386916A (zh) * | 2020-08-13 | 2021-09-14 | 蒋知秋 | 一种牵引绳固定的海上风电用防浪底座 |
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