JPWO2015099093A1 - Shake reduction device and floating body provided with the same - Google Patents

Abstract

An object of the present invention is to provide a fluctuation reducing device capable of efficiently reducing the fluctuation of a floating body with a simple structure, and a floating body including the same. It is a device for reducing the shaking of the floating body floating on the water. The vibration reduction device is arranged on the lower side of the floating body in the vertical direction. And a connecting portion that connects in a state where water flows between the plate body and the plate portion. Also, a flow path is formed in which the water flow on the bottom surface of the floating body becomes faster.

Description

  The present invention relates to a fluctuation reducing device that reduces fluctuation of a floating body and a floating body including the same.

  When various facilities are installed on the water such as the sea or lake, there are a method in which a support is buried in the bottom and a method in which a floating body is floated on the water. When a floating body floats on the water, the floating body is shaken by waves on the water surface.

  On the other hand, in Patent Document 1, as a device for reducing the shaking generated in the floating body, a shaking reducing member is disposed at the lower part of the floating body via a connecting member, and the shaking reducing member is suspended within a predetermined distance from the seabed. A device for lowering is described. Further, Patent Document 2 describes a sway reduction device in which a plate spaced a predetermined distance from the floating body is provided on at least the wave side of the floating body that floats on water, and a penetrating portion is formed between the plate and the floating body. Has been. Further, Patent Document 3 describes that a plate that is spaced apart from the floating body by a predetermined distance is disposed so that the surface having the largest area is parallel to the water surface.

JP 2006-103449 A JP 2002-37184 A U.S. Pat. No. 8,347,803

  By using the fluctuation reducing device described in Patent Literature 1, Patent Literature 2 and Patent Literature 3, the fluctuation of the floating body can be reduced, but the device may be large or the effect of reducing the fluctuation may be small. is there.

  This invention solves the subject mentioned above, and it aims at providing the fluctuation body which can reduce the fluctuation of a floating body main body efficiently with a simple structure, and a floating body provided with the same.

  In order to achieve the above-described object, the fluctuation reducing device of the present invention is a fluctuation reducing apparatus for a floating body that floats on water, and includes a plate portion disposed on a lower side in the vertical direction of the floating body, and the plate portion. Connecting the floating body to the floating body in a state where water flows between the floating body and the plate portion, and between the bottom surface of the floating body and the inside from the outside of the floating body The flow path forms a flow path in which 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.

  Further, d is the draft of the floating body, b is the width of the surface of the plate portion connected to the connecting portion, and b is the distance between the floating body and the plate portion in the vertical direction. In the case of s, it is preferable that 0.05 ≦ b / d ≦ 0.5 and 0.01 ≦ s / d ≦ 0.2.

  Moreover, it is preferable that the angle which the said board part makes with the surface with the largest area of the part connected to the said connection part of the said board part and a perpendicular direction is 0 degree or more and 90 degrees or less.

  Further, the width of the surface of the plate portion that is connected to the connection portion is the largest, and b is the width of the surface of the plate portion that is connected to the connection portion of the plate portion and the vertical direction. Is 0, and the distance between the end surface of the floating body in the horizontal direction and the upper end of the plate portion in the vertical direction is x0, it is preferable that 0 ≦ x0 ≦ b × sin θ.

  The plate portion is connected to a first plate portion that is a portion connected to the connection portion and an end portion on the lower side in the vertical direction of the first plate portion, and the largest surface is parallel to the vertical direction. A vertical plate length of the largest surface of the second plate portion is defined as h, and a width of the surface having the largest area of the first plate portion is defined as b. <H / b ≦ 1 is preferable.

  Moreover, when the said board part sees from a perpendicular direction, it is preferable that a part overlaps with the said floating body main body, and a part does not overlap.

  Moreover, it is preferable that the said board part contains the part whose surface with the largest area is parallel to the bottom face of the said floating body main body.

  Moreover, it is preferable that 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.

  In order to achieve the above-described object, a floating body of the present invention includes any of the above-described vibration reduction devices and a floating body main body on which the vibration reduction devices are installed.

  Moreover, it is preferable that the said floating body main body is formed in the outer edge of a bottom face by a some side, and is arrange | positioned at at least 1 side among the said some side.

  Moreover, it is preferable that the said shake reduction apparatus is arrange | positioned in the whole region of the outer edge of the said floating body main body.

  According to the present invention, the irreversible flow path can be formed between the floating body and the plate portion by the plate portion disposed below the bottom surface of the floating body. Thereby, when the flow of the water of the direction which pushes a floating body main body arises, and the case where the flow of water arises in the direction which pulls a floating body main body, the force of the direction which cancels the force can be applied. Thereby, the fluctuation of the floating body can be efficiently reduced with a simple structure.

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 the floating body according to the present embodiment. FIG. 3 is an explanatory diagram for explaining the operation of the floating body fluctuation reducing device. FIG. 4 is an explanatory diagram for explaining the operation of the floating body fluctuation reducing device. FIG. 5 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 6 is a top view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 7 is a top view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 8 is a top view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 9 is a top view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 10 is a top view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 11 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 12 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 13 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 14 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 15 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 16 is a cross-sectional view for explaining the operation of the sway reduction device of FIG. FIG. 17 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 18 is an enlarged view showing the floating body fluctuation reducing device of FIG. 17 in an enlarged manner. FIG. 19 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 20 is a cross-sectional view showing an example of the fluctuation reducing device. FIG. 21 is a cross-sectional view showing an example of the fluctuation reducing device. FIG. 22 is a cross-sectional view showing an example of a measurement result.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  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 the floating body according to the present embodiment. Floating bodies are floating structures such as floating piers, floating warehouses, floating parking lots, work ships, oil production platforms, and foundations for offshore wind turbines.

  As shown in FIGS. 1 and 2, the floating body 10 includes a floating body 12 and a fluctuation reducing device 14. The floating body 12 is a structure that floats with respect to the water surface W. The floating body 12 has, for example, an outer surface formed of a steel plate and a sealed space inside. The floating body 12 has a specific gravity lighter than water and floats with respect to the water surface W when the internal space is filled with air. Further, the floating body 12 may be formed of an object having a specific gravity lighter than that of water. The floating body 12 of the present embodiment is a rectangular parallelepiped having a rectangular bottom surface (surface on the lower side in the vertical direction).

  The sway reduction device 14 is provided on the outer edge of the floating body 12. The sway reduction device 14 includes four reduction units 20. The four reduction units 20 are respectively arranged on the four sides of the bottom surface of the floating body 12.

  The reduction unit 20 includes a plate portion 22 and a connection portion 24 that connects the plate portion 22 and the floating 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 12 is the longitudinal direction, and the surface (surface) having the largest area is arranged in a direction parallel to the bottom surface of the floating body 12. Has been. The plate portion 22 is disposed so as to cover substantially the entire region of the side of the bottom surface of the floating body 12. That is, the plate portion 22 has a length in the longitudinal direction substantially the same as the side of the bottom surface of the floating body 12, and is disposed at a position overlapping in the extending direction of the side. Further, as shown in FIG. 2, the plate portion 22 is arranged at a predetermined distance below the bottom surface of the floating body 12 in the vertical direction. Further, as shown in FIGS. 1 and 2, when the plate portion 22 is viewed from the vertical direction (a direction orthogonal to the water surface W), a part of the plate part 22 overlaps with the floating body 12 and a part of the plate 22 does not overlap with the floating body 12. Become. In other words, 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.

  The connection part 24 is a rod-like member, and fixes the plate part 22 to the floating body 12. A plurality of connecting portions 24 are provided in the extending direction of the bottom side of the floating body 12, and the plate portion 22 is fixed to the floating body 12 at a plurality of locations. Further, there is a gap between the connection part 24 and the connection part 24.

  The sway reduction device 14 is configured as described above, and the plate portion 22 is fixed by the connecting portion 24 with a gap between the floating body 12. Further, the plate portion 22 partially overlaps the floating body 12 when viewed from the vertical direction as described above.

  Next, the function of the fluctuation reducing device 14 will be described with reference to FIGS. 3 and 4. 3 and 4 are explanatory diagrams for explaining the operation of the floating body fluctuation reducing device. 3 and 4 illustrate one reduction unit 20 among the plurality of reduction units 20, the other reduction units 20 have the same function.

  As shown in FIG. 3, in the floating body 10, when a wave that pushes the floating body 12, a so-called pushing wave 50 collides with the floating body 12, a wave forcing force moment 52 acts on the floating body 12. At this time, in the sway reduction device 14, a part of the water flow 54 moved by the push wave 50 becomes a water flow 56 that passes between the plate portion 22 and the bottom surface of the floating body 12. The water flow 56 becomes a high-speed flow pushed out by the pushing wave 50, so that a region having a lower pressure than the other part of the bottom surface is generated on the bottom surface in the vicinity of the plate portion 22 of the floating body 12. As a result, the sway reduction device 14 generates a cancel force 58 that is a force in a direction to cancel the wave forcing moment 52 in the vicinity of the reduction unit 20 on the surface on the push wave 50 side. The sway reduction device 14 can reduce the force generated in the floating body 12 when the push wave 50 acts on the floating body 12 by generating the canceling force 58.

  As shown in FIG. 4, when the so-called pulling wave 60 acts on the floating body 12, the floating body 10 has a wave forcing force moment 62 (wave forcing moment 52 on the floating body 12. Force in the opposite direction). At this time, in the sway reduction device 14, a part of the water flow moved by the pulling wave 60 becomes a water flow 64 that passes between the plate portion 22 and the bottom surface of the floating body 14, and the remaining water flow is the bottom surface of the plate portion 22. It becomes the water flow 66 which goes around. In other words, in the case of a water flow from the floating body 12 toward the plate portion 22, the space between the plate portion 22 and the bottom surface of the floating body 12 is a narrow space, making it difficult for the water flow to pass through (water is difficult to flow). A water stream 64 and a water stream 66 are formed. As a result, the water flow from the floating body 12 toward the plate portion 22 side by the pulling wave 60 increases in resistance in the vicinity of the fluctuation reducing device 14, and other portions of the bottom surface are formed on the bottom surface of the floating body 12 near the plate portion 22. An area where the pressure increases is generated. As a result, the sway reduction device 14 generates a cancellation force 68 that is a force in a direction to cancel the wave forcing force moment 62 in the vicinity of the reduction unit 20 on the surface on the side of the pulling wave 60. The sway 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 canceling force 68.

  The floating body 10 has a gap between the bottom surface of the floating body main body 12 and a plate portion 22 that is partially overlapped when viewed from the vertical direction, whereby the bottom surface and the plate portion 22 of the floating body main body 12 are provided. It is possible to form irreversible flow paths having different water flow behaviors depending on the direction of the water flow flowing in between them. Thereby, a moment in a different direction can be generated in the floating body 12 when the pushing wave 50 acts and when the pulling wave 60 acts, and the wave forcing force moment acting on the pushing wave 50 and the pulling wave 60 is generated. 52 and 62 can be suitably reduced by the canceling forces 58 and 68. Moreover, since the floating body 10 can efficiently reduce the shaking by the shaking reduction device 14, a device attached to the floating body 12 can be made small.

  Further, the sway reduction device 14 can reduce the sway of the floating body 12 with a simple structure in which the plate part 22 is fixed by the connection part 24. Thereby, the shaking of the floating body 12 can be effectively reduced with a simple structure.

  The fluctuation reducing device 14 sets the region overlapping the floating body 12 of the plate portion 22 to an appropriate ratio, so that 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 in an appropriate balance. In particular, when the pulling wave 60 is generated, 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 12, and the canceling force 68 can be suitably generated.

  The fluctuation reducing device 14 sets the water flow 56 when the pushing wave 50 is generated and the water flows 64 and 66 when the pulling wave 60 is generated by setting the distance between the plate portion 22 and the floating body 12 to an appropriate range. It can be generated with an appropriate balance. Specifically, when the push wave 50 is generated, the compressed water flow 56 can be a water flow having an appropriate speed. When the pull wave 60 is generated, the space between the plate portion 22 and the bottom surface of the floating body 12 is determined. Can be made into a state where it is difficult for the water flow to pass through. In other words, between the bottom surface of the floating body 12 and the plate portion 22, a flow path in which the water flow from the outside to the inside of the floating body 12 is easier than the flow from the inside to the outside of the floating body (flow path through which water flows easily). ) Can be formed. Specifically, between the bottom surface of the floating body 12 and the plate portion 22, the direction from the outside to the inside of the floating body 12 is more on the bottom surface (near the bottom surface) than the direction from the inside to the outside of the floating body. The water flow becomes faster. Thereby, the cancellation forces 58 and 68 can be suitably generated, and the fluctuation of the floating body 12 can be more reliably reduced.

  Here, the floating body 10 and the fluctuation reducing device 14 are not limited to the above embodiment. Hereinafter, another embodiment which is a modified example of the floating body 10 and the fluctuation reducing device 14 will be described with reference to FIGS. 5 to 10. In addition, in the following modification, about the structure similar to the floating body 10 and the fluctuation reduction apparatus 14, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 5 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10a illustrated in FIG. 5 includes a floating body 12 and a sway reduction device 14a. The sway reduction device 14a includes a plurality of reduction units 20a. The reduction unit 20 a includes a plate portion 22 a and a plurality of connection portions 24. The plate portion 22 a has a surface with the largest area that is inclined at a predetermined angle with respect to the bottom surface of the floating body 12. Specifically, the plate portion 22a is inclined in a direction toward the lower side in the vertical direction as the distance from the floating body 12 (center of the floating body 12) increases in a cross section orthogonal to the longitudinal direction. In addition, the plate portion 22 a partially overlaps the floating body 12 and does not overlap the floating body 12. This is the same as the plate portion 22.

  The sway reduction device 14 a can form a water flow similar to that of the plate portion 22 by inclining the plate portion 22 a with respect to the bottom surface of the floating body 12. Further, the plate portion 22a tilts the plate portion 22a in a direction toward the lower side in the vertical direction as it moves away from the floating body main body 12, so that more water flows inflow between the plate portion 22a and the floating body main body 12 when the wave is pushed. It is possible to increase the resistance of the water flow flowing between the plate portion 22a and the floating body 12 at the time of pulling. Thereby, the shaking of the floating body 12 can be reduced.

  FIG. 6 is a top view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10b illustrated in FIG. 6 includes a floating body 12 and a fluctuation reducing device 14b. The sway reduction device 14 b includes two reduction units 20. The sway reduction device 14 b is provided with the reduction unit 20 only on two opposite sides among the four sides of the floating body 12. Thus, the fluctuation reducing device 14b is not limited to being provided in the entire outer edge of the floating body 12, and the fluctuation reducing device 14b may be selectively provided in a plurality of sides. Moreover, in the modification, although it was set as two sides which oppose among four sides, it is good also as two sides which do not oppose as 3 sides or 1 side.

  FIG. 7 is a top view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10c illustrated in FIG. 7 includes a floating body 12 and a fluctuation reducing device 14c. The sway reduction device 14c has four reduction units 20c. The reduction unit 20 c includes two plate portions 22 c and a plurality of connection portions 24 that connect the plate portion 22 c and the floating body 12. The two plate portions 22 c are arranged in series along the side of the floating body 12. That is, the two plate portions 22c are arranged so as to overlap with different positions on the sides of the floating body 12. The plate portion 22 c partially overlaps the floating body 12 and does not overlap the floating body 12. This is the same as the plate portion 22. Even if the floating body 10c divides the plate portion 22c of the fluctuation reducing device 14c arranged with respect to one side of the floating body 12 into a plurality of parts, the same effect as described above can be obtained. Moreover, in the said modification, although the board part of one reduction unit 20c was made into the two board parts 22c, the number of board parts is not specifically limited. The reduction unit may include three or more plate portions.

  FIG. 8 is a top view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10d shown in FIG. 8 includes a floating body 12 and a fluctuation reducing device 14d. The sway reduction device 14d has four reduction units 20d. The reduction unit 20d includes a plate portion 22d, a plurality of connection portions 24 that connect the plate portion 22d and the floating body 12. The plate portion 22d is disposed along the side of the floating body 12. The plate portion 22d has a length in the longitudinal direction shorter than the side where the floating body 12 is installed. Therefore, the plate portion 22 d is disposed on a part of the side of the floating body 12 in the direction along the side of the floating body 12. The plate portion 22d of this modification is disposed in a part including the center of the side of the floating body 12. The plate portion 22 d partially overlaps the floating body 12 and does not partially overlap the floating body 12. This is the same as the plate portion 22. The floating body 10d can obtain the same effect as described above even if the plate portion 22d of the fluctuation reducing device 14d arranged with respect to one side of the floating body 12 is shorter than the floating body 12.

  In addition, the vibration reduction device can arrange the plate portion in an appropriate range with respect to the side of the floating body main body, so that the canceling force with respect to the wave forcing force moment can be set to a suitable magnitude, and the fluctuation can be reduced. it can.

  FIG. 9 is a top view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10e shown in FIG. 9 includes a floating body main body 12a and a fluctuation reducing device 14e. The floating body 12a is a cylindrical structure whose outer periphery is circular when viewed from the vertical direction. The sway reduction device 14e includes a reduction unit 20e disposed on a part of a circular outer edge of the bottom surface of the floating body 12a. In the sway reduction device 14e of this modification, two reduction units 20e are respectively disposed at opposing portions of a circular outer edge. The reduction unit 20e includes a plate portion 22e having a shape obtained by cutting off a part of the ring (fan shape), a connection portion 24 that connects the plate portion 22e and the floating body 12a.

  FIG. 10 is a top view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10f illustrated in FIG. 10 includes a floating body main body 12b and a fluctuation reducing device 14f. The floating body 12b is a polygonal columnar structure having an octagonal outer periphery when viewed from the vertical direction. The sway reduction device 14f includes reduction units 20f disposed on each of the eight sides of the octagonal outer edge of the bottom surface of the floating body 12b. The reduction unit 20f includes a plate portion 22f, a plurality of connection portions 24 that connect the plate portion 22f and the floating body 12b. The plate portion 22f is disposed along the side of the floating body 12.

  As shown in FIGS. 9 and 10, the shape of the floating body that installs the fluctuation reducing device is not limited to a rectangular parallelepiped having a rectangular bottom surface, and can be applied to various shapes.

  Next, FIG. 11 is sectional drawing which shows schematic structure of the floating body of other embodiment. A floating body 10g shown in FIG. 11 has a floating body main body 12 and a fluctuation reducing device 14g. The sway 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 22g has the largest area connected to the first plate portion 70 inclined at a predetermined angle with respect to the bottom surface of the floating body 12 and the vertical lower end of the first plate portion 70. The surface having the largest area has the second plate part 72 orthogonal to the bottom surface of the floating body 12. That is, the plate portion 22g is connected to two plates having different angles. Moreover, the 1st board part 70 inclines in the direction which goes to a perpendicular direction lower side as it leaves | separates from the floating body main body 12 (center of the floating body 12) in the cross section orthogonal to a longitudinal direction. The plate portion 22g partially overlaps the floating body 12 and does not partially overlap the floating body 12. This is the same as the plate portion 22.

  The fluctuation reducing device 14g includes, as a plate portion 22g, a first plate portion 70 that is inclined with respect to the bottom surface of the floating body 12 and a second plate that extends in the vertical direction at an end portion on the lower side in the vertical direction of the second plate portion 70. By providing the portion 72, the same water flow as that of the plate portion 22 can be formed. Further, the plate portion 22g tilts the first plate portion 70 in a direction toward the lower side in the vertical direction as it moves away from the floating body 12 so that the water flow that flows between the plate portion 22g and the floating body 12 at the time of pushing waves. It is possible to increase the resistance of the water flow flowing between the plate portion 22g and the floating body 12 at the time of the wave pull. Thereby, the shaking of the floating body 12 can be reduced. Furthermore, the resistance of the water flow flowing between the plate portion 22g and the floating body 12 can be further increased by the second plate portion 72 at the time of drawing. Further, the size of the plate portion 22g can be made smaller than that of the plate portion 22a by combining the first plate portion 70 and the second plate portion 72.

  FIG. 12 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10h illustrated in FIG. 12 includes a floating body main body 12 and a fluctuation reducing device 14h. The sway reduction device 14h includes a plurality of reduction units 20h. The reduction unit 20 h includes a plate portion 22 h and a plurality of connection portions 24. The reduction unit 20h has the same structure as that of the reduction unit 20a except that the reduction unit 20a is moved to the center side of the floating body 12 and all the plate portions 22h overlap the floating body 12.

  The fluctuation reducing device 14h can form the same water flow as that of the plate portion 22 by inclining the plate portion 22h with respect to the bottom surface of the floating body main body 12 even if the plate portion 22h overlaps with the floating body main body 12. Furthermore, the sway reduction device 14h tilts the plate portion 22h in the direction toward the lower side in the vertical direction as it moves away from the floating body 12 to further reduce the water flow flowing between the plate portion 22h and the floating body 12 during a push wave. It is possible to increase the resistance of the water flow flowing between the plate portion 22h and the floating body 12 at the time of pulling. Thereby, the shaking of the floating body 12 can be reduced. In addition, the fluctuation reducing device 14h can place the floating body 80 such as a ship (hull) or a floating body in contact with the floating body 12 by arranging all the plate portions 22h so as to overlap the floating body 12.

  Note that the sway reduction device only needs to be able to form an irreversible flow path, and as in the above-described embodiment, the plate portion may be disposed so as to overlap the floating body main body 12, but a part of the plate portion overlaps the floating body main body 12. By arranging the portion so as not to overlap the floating body 12, the effect of reducing shaking can be further increased.

  Next, FIG. 13 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10i illustrated in FIG. 13 includes a floating body 12 and a fluctuation reducing device 14i. The sway reduction device 14i has a plurality of reduction units 20i. The reduction unit 20 i has a plate part 22 i and a plurality of connection parts 24. The plate portion 22i includes a first plate portion 90 in which the largest surface is orthogonal to the bottom surface of the floating body 12 and a second plate portion in which the largest surface is parallel to the bottom surface of the floating body 12. 92. Two plates with different angles are connected to the plate portion 22i. In the plate portion 22 i, the connecting portion of the first plate portion 90 and the second plate portion 92 is connected to the connecting portion 24. The first plate portion 90 is connected to the connection portion 24 at the end on the upper side in the extending vertical direction. The second plate portion 92 is connected to the connection portion 24 at the center side end of the floating body 12. Further, the plate portion 22 i partially overlaps the floating body 12 and does not partially overlap the floating body 12. This is the same as the plate portion 22. In the present embodiment, the first plate portion 90 is entirely overlapped with the floating body 12. The second plate portion 92 partially overlaps the floating body 12 and does not partially overlap the floating body 12.

  The fluctuation reducing device 14i can be configured by providing 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. A water flow similar to 22 can be formed. Furthermore, the resistance of the water flow flowing between the plate portion 22 i and the floating body 12 can be further increased by the first plate portion 90 at the time of drawing.

  Next, FIG. 14 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 10j illustrated in FIG. 14 includes a floating body 12 and a sway reduction device 14j. The sway reduction device 14j includes a plurality of reduction units 20j. The reduction unit 20j includes a plate portion 22j and a plurality of connection portions 24. The plate portion 22j has a surface with the largest area 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. And a second plate part 96 parallel to the bottom surface of the floating body 12. That is, the plate portion 22j is connected to two plates having different angles. Further, the second plate portion 96 is connected to the first plate portion 94 at the center side end of the floating body 12. Moreover, the 1st board part 94 inclines in the direction which goes to a perpendicular direction lower side as it leaves | separates from the floating body main body 12 (center of the floating body main body 12) in the cross section orthogonal to a longitudinal direction. More specifically, the first plate portion 94 extends in a direction perpendicular to the bottom surface of the floating body 12. The plate portion 22j partially overlaps the floating body 12 and does not partially overlap the floating body 12. This is the same as the plate portion 22. In the present embodiment, all of the first plate portion 94 overlaps the floating body 12. The second plate portion 96 partially overlaps the floating body 12 and does not partially overlap the floating body 12.

  The sway reduction device 14j can also be configured by providing 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. A water flow similar to 22 can be formed. Furthermore, the resistance of the water flow flowing between the plate portion 22j and the floating body 12 can be further increased by the first plate portion 94 at the time of drawing.

  Thus, the plate portion only needs to form an irreversible flow path, and plate-like members having various angles with respect to the bottom surface of the floating body 12 can be combined. Further, a plurality of plate portions having different angles can be combined.

  Next, FIG. 15 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 16 is a cross-sectional view for explaining the operation of the sway reduction device of FIG. In the above embodiment, any of the vibration reduction devices has a structure having a plate portion and a connection portion that connects the plate portion to the floating body, but is not limited thereto. A floating body 10k illustrated in FIG. 15 includes a floating body 12 and a fluctuation reducing device 14k. The sway reduction device 14k includes a plurality of reduction units 20k. The reduction unit 20 k includes a flow path 101 and rotating parts 102 and 104. The channel 101 has an opening formed in the side surface of the floating body 12 and the bottom surface of the floating body 12, and connects the side surface of the floating body 12 and the bottom surface of the floating body 12. The channel area of the channel 101 becomes narrower from the side surface of the floating body 12 toward the bottom surface of the floating body 12.

  The rotating part 102 is provided in the vicinity of the opening on the side surface of the floating body 12 of the flow path 101. The rotation unit 102 rotates the plate-like member with the vertical lower side of the opening as a base point. The rotation part 102 arrange | positions a plate-shaped member in the horizontal direction, opens the flow path 101, and closes the flow path 101 by arrange | positioning a plate-shaped member to a perpendicular direction.

  The rotating unit 104 is provided in the vicinity of the opening on the bottom surface of the floating body 12 of the flow channel 101. The rotation unit 104 rotates the plate-shaped member with the opening near the end of the floating body 12 as a base point. The rotation unit 104 closes the flow path 101 by disposing a plate-shaped member in the horizontal direction, and opens the flow path 101 by disposing the plate-shaped member in the vertical direction.

  In the sway reduction device 14k, the flow path 101 is an irreversible flow path in which the water flow is easy to pass during a push wave and the water flow is difficult to pass during a pulling wave. Thus, the water flow similar to that of the sway reduction device 14 can also be formed by forming the flow path in the floating body 12. In addition, the flow path 101 narrows the flow path area from the side surface of the floating body 12 toward the bottom surface of the floating body 12, thereby making the water flow flowing at the time of the push wave faster and less likely to flow at the time of the pulling wave. . Thereby, a fluctuation can be reduced more.

  Further, in the sway reduction device 14k, the plate-like members of the rotating parts 102 and 104 serve as fins for guiding the water flow. Furthermore, the vibration reduction device 14k can open and close the flow path 101 by the rotation units 102 and 104. Accordingly, when the floating body 10k does not need to reduce fluctuation, for example, when the floating body 10k is moved (navigated) to be installed at the destination, the flow passage 101 is blocked by the rotating units 102 and 104. , Resistance during movement can be reduced.

  FIG. 17 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. FIG. 18 is an enlarged view showing the floating body fluctuation reducing device of FIG. 17 in an enlarged manner. The floating body 110 illustrated in FIGS. 17 and 18 includes the floating body 12 and the sway reduction device 114. The sway reduction device 114 includes 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 includes a plate portion 122 and a plurality of connection portions 124. The plate part 122 is a plate in which the direction of the side (outer edge) of the arranged floating body 12 is the longitudinal direction, as in the above embodiment. The plate part 122 is connected to the connection part 124 at the end on the upper side in the vertical direction. A plurality of connection portions 124 are arranged at intervals in the direction of the side (outer edge) of the floating body 12 that is arranged. The connecting part 124 is fixed to the plate part 122 and the floating body 12, and the plate part 122 is fixed to the floating body 12.

  The plate portion 122 is connected to two plates having different angles. Specifically, the plate portion 122 includes a first plate portion 130 whose upper end in the vertical direction is connected to the connection portion 124, and a second plate connected to the lower end portion in the vertical direction of the first plate portion 130. Part 132. In the first plate portion 130 of the present embodiment, the surface having the largest area is inclined at a predetermined angle with respect to the bottom surface of the floating body 12. The second plate portion 132 has a surface with the largest area orthogonal to the bottom surface of the floating body 12. Moreover, the 1st board part 130 inclines in the direction which goes to a perpendicular direction lower side as it leaves | separates from the floating body 12 (center of the floating body 12) in the cross section orthogonal to a longitudinal direction. The plate portion 122 partially overlaps the floating body 12 and does not partially overlap the floating body 12.

  The fluctuation reducing device 114 includes a first plate 130 that is inclined with respect to the bottom surface of the floating body 12 and a second plate that extends in the vertical direction on the lower end of the first plate 130 in the vertical direction. By providing the portion 132, the same water flow as that of the plate portion 122 can be formed. Further, the sway reduction device 114 can obtain the same effect as the sway reduction device 14g.

  The fluctuation reducing device 114 is a floating body that is disposed with the draft of the floating body 12 being a distance from the draft line set in the floating body 12 to the lower end (that is, the bottom surface) of the floating body 12 in the vertical direction. When the width of the surface having the largest area connected to the connection portion 124 of the plate portion 122, which is the length of the largest surface in the surface orthogonal to the direction of the 12 sides (outer edges), is defined as b. .05 ≦ b / d ≦ 0.5 is preferable. Here, the width of the surface having the largest area connected to the connection portion 124 of the plate portion 122 has the first plate portion 130 and the second plate portion 132 having different angles as in the vibration reduction device 114. , The width of the first plate portion 130. In addition, the fluctuation reducing device 114 preferably satisfies 0.01 ≦ s / d ≦ 0.2, where s is the distance between the floating body 12 and the plate portion 122 in the vertical direction.

  By setting the relationship between the width b, the distance s, and the draft d within the above range, the range through which water passes between the floating body 12 and the plate portion 122 can be appropriately sized. The water stream passing through the surroundings can be formed into the desired water stream. Thereby, the water flow in the area | region of the bottom face of the floating body 12 can be formed suitably, the water flow which flows on the bottom face of a floating body main body at the time of a push wave is made faster, and the water flow which flows on the bottom face of a floating body main body at the time of a pulling wave It becomes harder to flow, and the shaking can be further reduced.

  In addition, the vibration reduction device 114 has an angle θ formed by a surface having the largest area of the first plate portion 130 that is a portion connected to the connection portion 124 of the plate portion 122 and a vertical direction of 0 ° or more and 90 ° or less. It is preferable to do. Here, in the present embodiment, the first plate portion 130 is inclined with respect to the horizontal direction, but the first plate portion 130 may be set in the horizontal direction (θ = 90 °). Further, the first plate portion 130 may be set in the vertical direction (θ = 0 °).

  By setting the angle θ to 0 ° or more and 90 ° or less, the water flow passing between the plate portion 122 and the floating body 12 can be changed to a desired water flow. In other words, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow that flows on the bottom surface of the floating body is faster when the wave is pushed, and the water flow that flows on the bottom surface of the floating body is more powerful when the wave is pulled. It becomes difficult to flow. Thereby, a fluctuation can be reduced more.

  In addition, when the distance between the end surface of the floating body 12 in the horizontal direction and the end portion on the upper side in the vertical direction of the plate portion 122 is x0, the vibration reduction device 114 preferably satisfies 0 ≦ x0 ≦ b × sin θ. That is, in this embodiment, when x0 is set to be larger than 0 and viewed from the vertical direction, the plate portion 122 is arranged so as to partially overlap the floating body 12 and 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.

  By disposing the plate part 122 in the above range with respect to the floating body 12, the water flow passing between the plate part 122 and the floating body 12 can be changed to 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 at the time of the pushing wave (near the bottom surface of the floating body 12 between the bottom surface of the floating body 12 and the plate portion 122) ) And the water flow flowing on the bottom surface of the floating body 12 is less likely to flow during the pulling. Thereby, a fluctuation can be reduced more.

  In addition, the fluctuation reducing device 114 preferably satisfies 0 <h / b ≦ 1, where h is the vertical length (height) of the largest surface of the second plate portion 132. By making the 2nd board part 132 the magnitude | size of the said range, the water flow which passes between between the board part 122 and the floating body main body 12 can be made into a desired water flow. In other words, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow that flows on the bottom surface of the floating body is faster when the wave is pushed, and the water flow that flows on the bottom surface of the floating body is more powerful when the wave is pulled. It becomes difficult to flow. Thereby, a fluctuation can be reduced more.

  Note that although the vibration reduction device 114 has a shape in which the plate portion 122 includes the second plate portion 132, the plate portion 122 does not have the second plate portion 132 as in the above-described embodiment, that is, h = 0. It is good also as a shape to become. 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. In other words, the water flow in the region of the bottom surface of the floating body 12 can be suitably formed, the water flow that flows on the bottom surface of the floating body is faster when the wave is pushed, and the water flow that flows on the bottom surface of the floating body is more powerful when the wave is pulled. It becomes difficult to flow. Thereby, a fluctuation can be reduced more. Thus, the relationship between the width b and the length h is preferably 0 ≦ h / b ≦ 1.

  Although the vibration reduction device 114 of the present embodiment will be described as a case where one reduction unit 120 is provided, a plurality of the reduction devices may be provided as in the above embodiment. Here, FIG. 19 is a cross-sectional view illustrating a schematic configuration of a floating body according to another embodiment. A floating body 160 illustrated in FIG. 19 includes a floating body main body 112 and a peristaltic reduction device 162. The sway reduction device 162 has a reduction unit 120 disposed on each of two opposing sides of the bottom surface (outer edge) of the floating body 112. Like the floating body 160, the reduction unit 120 may be disposed on each of two opposing sides of the outer edge of the floating body main body 112.

  Next, an example of a measurement result of the motion reduction device will be described with reference to FIGS. 20 and 21 are cross-sectional views showing examples of the vibration reduction device. FIG. 22 is a cross-sectional view showing an example of a measurement result. In this measurement, measurement was performed for Example 1 and Example 2 having the sway reduction device of this embodiment. In addition, for comparison, measurement was also performed in the case where the fluctuation reducing device was not provided, that is, only the floating body was provided.

  In Example 1, measurement was performed using the floating body 110a illustrated in FIG. A floating body 110a illustrated in FIG. 20 includes a fluctuation reducing device 114a. The sway reduction device 114a includes a reduction unit 120a. The reduction unit 120a includes a plate portion 122a and a plurality of connection portions 124. The plate part 122a has a first plate part 130a and a second plate part 132a. The plate portion 122a has the above-described distance x0 of 0 and an angle θ of less than 90 °. That is, the first plate part 130a is inclined with respect to the horizontal direction (the bottom surface of the floating body 12). In addition, the fluctuation reducing device 114a has the above-described preferable ranges of 0.05 ≦ b / d ≦ 0.5, 0.01 ≦ s / d ≦ 0.2, 0 ° ≦ θ ≦ 90 °, and 0 ≦ x0 ≦. All of b × sin θ and 0 ≦ h / b ≦ 1 are satisfied. A plurality of connecting portions 124a are arranged at intervals in the direction of the side (outer edge) of the arranged floating body 12. The connection part 124 a is fixed to the plate part 122 a and the floating body 12, and fixes the plate part 122 a to the floating body 12.

  In Example 2, measurement was performed using the floating body 110b illustrated in FIG. A floating body 110b illustrated in FIG. 21 includes a fluctuation reducing device 114b. The sway reduction device 114b includes a reduction unit 120b. The reduction unit 120b includes a plate portion 122b and a plurality of connection portions 124. The plate part 122b is formed of a single plate. That is, the second plate portion is not provided. In the plate portion 122b, the above-described distance x0 is greater than 0 and the angle θ is less than 90 °. Also, the length h is zero. The fluctuation reducing device 114b having the above shape has the above-described preferable ranges of 0.05 ≦ b / d ≦ 0.5, 0.01 ≦ s / d ≦ 0.2, 0 ° ≦ θ ≦ 90 °, 0 ≦ x0. ≦ b × sin θ and 0 ≦ h / b ≦ 1 are all satisfied. A plurality of connecting portions 124b are arranged at intervals in the direction of the side (outer edge) of the floating body 12 that is arranged. The connecting portion 124b is fixed to the plate portion 122b and the floating body main body 12, and the plate portion 122b is fixed to the floating body main body 12.

  When the floating bodies of Examples 1 and 2 and the comparative example were floated on the water surface and a wave was generated, the amplitude of the inclination (roll angle) generated in the floating body was measured. The measurement results are shown in FIG. FIG. 22 shows the result of the regular wave test, and shows the difference in amplitude depending on the presence or absence of the device in the wave period at which the floating roll angle increases. As shown in FIG. 22, it can be seen that the floating bodies of Examples 1 and 2 can reduce the fluctuation of the floating body.

DESCRIPTION OF SYMBOLS 10 Floating body 12 Floating body main body 14 Fluctuation reduction apparatus 20 Reduction unit 22 Plate part 24 Connection part W Water surface

Claims (11)

A device for reducing the shaking of a floating body floating on water,
A plate portion arranged on the lower side of the floating body in the vertical direction;
A connecting portion for connecting the plate portion and the floating body main body in a state in which water flows between the floating body main body and the plate portion;
Between the bottom surface of the floating body, a flow path in which the water flow on the bottom surface of the floating body is faster in the direction from the outside to the inside of the floating body than in the direction from the inside to the outside of the floating body. A featured shake reduction device.   The draft of the floating body is defined as d, the width of the surface of the plate portion connected to the connecting portion having the largest area is defined as b, and the distance between the floating body and the plate portion in the vertical direction is defined as s. When it does, it is 0.05 <= b / d <= 0.5 and it is 0.01 <= s / d <= 0.2, The fluctuation reducing apparatus of Claim 1 characterized by the above-mentioned.   3. The angle between a plane and the vertical direction of the plate portion having the largest area of the portion connected to the connection portion of the plate portion is 0 ° or more and 90 ° or less. The sway reduction device described in 1.   The width of the surface where the area of the plate portion connected to the connection portion is the largest is b, and the width of the surface of the plate portion connected to the connection portion is the vertical direction. The angle is θ, and 0 ≦ x0 ≦ b × sin θ, where x0 is the distance between the end surface of the floating body in the horizontal direction and the end portion on the upper side in the vertical direction of the plate portion. To 5. The vibration reduction device according to any one of items 1 to 3. The plate portion is connected to a first plate portion that is a portion connected to the connection portion and an end portion on the lower side in the vertical direction of the first plate portion, and the largest surface is parallel to the vertical direction. Two plate parts,
When the length in the vertical direction of the largest surface of the second plate portion is h and the width of the surface having the largest area of the first plate portion is b, 0 <h / b ≦ 1. The sway reduction device according to any one of claims 1 to 4.   The sway reduction device according to any one of claims 1 to 5, wherein when viewed from a vertical direction, the plate portion partially overlaps the floating body main body and does not partially overlap.   The fluctuation reducing device according to any one of claims 1 to 6, wherein the plate portion includes a portion in which a surface having the largest area is parallel to a bottom surface of the floating body.   The fluctuation reducing device according to any one of claims 1 to 6, wherein the plate portion includes a portion in which a surface having the largest area is inclined with respect to a bottom surface of the floating body. The vibration reduction device according to any one of claims 1 to 8,
And a floating body provided with the sway reduction device. The floating body is formed of a plurality of sides at the outer edge of the bottom surface,
The floating body according to claim 9, wherein the floating body is arranged on at least one of the plurality of sides.   The floating body according to claim 9, wherein the sway reduction device is disposed over the entire outer edge of the floating body.

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