JP5577206B2 - Sway reduction device and floating body - Google Patents

Description

  The present invention relates to a fluctuation reducing device and a floating body that reduce the fluctuation of a floating body main body floating on water.

  As this type of vibration reduction device, for example, as shown in Patent Document 1 below, at least on the wave side of the floating body, a horizontal plate is provided at a predetermined distance from the floating body along the substantially horizontal direction. The upper surface is located at the same height as the bottom surface of the floating body, the floating body has a substantially rectangular parallelepiped shape, and the incident wave from the wave upper side hits the side surface of the floating body, and a part between the floating body and the horizontal plate. A configuration for passing water is known.

Japanese Patent No. 4358456

  By the way, in such a sway reduction device, there is room for further improvement in the reduction of the sway of the floating body.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the fluctuation reduction apparatus and floating body which can reduce the fluctuation of a floating body main body effectively.

In order to solve the above problems, the present invention proposes the following means.
The vibration reduction device according to the present invention is a vibration reduction device including a flat plate that can be mounted on a side surface facing a width direction in a floating body main body floating on water, and the flat plate is a boundary portion between a side surface and a bottom surface of the floating body main body. Is arranged along the substantially horizontal direction with a constriction gap between the boundary portion and the bottom portion in the water depth direction. When tilted by shaking, water particles are allowed to pass through to generate vortices, and the distance A along the depth direction of the throttle gap and the width dimension B along the width direction of the floating body main body are: The first ratio A / B is 0.025 or more and 0.1 or less.
Here, the substantially horizontal direction allows a width of about ± 30 ° with respect to the horizontal direction.

According to the present invention, energy dissipation can be caused by allowing water particles moved by an incident wave to pass through the constriction gap, and the fluctuation of the floating body can be reduced.
That is, when an incident wave is applied to the floating body from the opposite side of the flat plate across the floating body along the width direction, the floating body is shaken around a virtual axis extending in a direction perpendicular to the width direction in the horizontal direction. It tilts by rolling, and the flat plate moves with the floating body to the bottom of the water. Then, the fluctuation of the floating body generated by the incident wave and the relative water particle motion or flow generated by the incident wave itself pass through the aperture gap while being inhibited by the flat plate, and from the inside to the outside of the floating body along the width direction. It will blow out from the aperture gap. Thereby, it becomes possible to generate vortices to cause energy dissipation, and to reduce the shaking of the floating body.

Here, the first ratio A / B is not less than 0.025 and not more than 0.1, and the first ratio A / B is a range in which the above-described operational effect that is achieved by providing the aperture gap becomes remarkable. Therefore, it is possible to effectively reduce the fluctuation of the floating body.
That is, when the first ratio A / B is smaller than 0.025, the flat plate is too close to the boundary portion, so that the flat plate receives a large wave force of the incident wave. On the other hand, if the first ratio A / B is greater than 0.1, the aperture gap becomes too large, and even if the water particles moved by the incident wave pass through the aperture gap, the fluctuation of the floating body is reduced. Insufficient energy dissipation may occur.

  Further, a distance C along the width direction between the boundary portion and an inner edge located inside the floating body along the width direction in the flat plate, and along the width direction of the floating body. The width ratio B and the second ratio C / B may be 0.05 or less.

  In this case, since the second ratio C / B is 0.05 or less, the above-described effects can be reliably achieved. That is, when the second ratio C / B is greater than 0.05, sufficient energy dissipation occurs to reduce the fluctuation of the floating body even if the water particles moved by the incident wave pass through the aperture gap. There is a possibility that it cannot be made.

  The flat plate may be detachable from the side surface of the floating body.

In this case, since the flat plate can be attached to and detached from the side surface of the floating body, the floating body can be floated by removing the flat plate from the floating body even in shallow water where the water depth is shallow and the flat plate can contact the water bottom. it can.
Further, for example, when the floating body is moved on the water, an increase in fluid resistance (decrease in moving speed) during movement caused by the flat plate can be avoided by detaching the flat plate from the floating body.

  In addition, a mounting frame that is attachable to and detachable from the side surface of the floating body may be provided, and the flat plate may be attached to a bottom portion of the mounting frame.

  In this case, since the flat plate is attached to the bottom portion of the mounting frame, the above-described effects can be reliably achieved.

  In addition, the mounting frame includes a cushioning material attached to an outer side facing the outside of the floating body along the width direction, and a flooring material attached to the top of the mounting frame and positioned on the water, A buffer material may contact the side surface of the contact object which can contact the said floating body main body, and the said floating body main body and the said contact target may contact.

  Here, in the present invention, the object to be contacted means, for example, a quay (port, land facility, etc.), a ship, a floating pier, a floating parking lot, and the like. In addition, the term “welding” means that the ships are attached to each other, or the object to be contacted and the floating body are parallel to each other with their sides facing each other. , Traffic between people and goods is possible.

In this case, since the cushioning material comes into contact with the side surface of the object to be contacted, the floating body body and the object to be contacted come into contact with each other. Even in this case, the contact object and the floating body can be brought into contact with each other without bringing the flat plate into contact with the side surface of the contact object. Therefore, it is possible to prevent the side surface and the flat plate of the contact target from being damaged when contacting the contact target and the floating body main body.
In addition, since the flooring material is attached to the top of the mounting frame, when the object to be contacted and the floating body are brought into contact with each other and people and goods are transported between them, it is carried out smoothly over the flooring material. be able to.

  Moreover, the floating body which concerns on this invention is provided with the floating body main body which floats on water, and the said fluctuation reduction apparatus, It is characterized by the above-mentioned.

  According to the present invention, since the fluctuation reducing device is provided, the fluctuation of the floating body can be effectively reduced.

  According to the fluctuation reducing device and the floating body according to the present invention, the fluctuation of the floating body can be effectively reduced.

It is the side view and top view of a ship which concern on 1st Embodiment of this invention. It is an AA cross-sectional arrow view shown in FIG. It is a figure explaining the effect | action of the ship shown in FIG. It is sectional drawing of the modification of the ship which concerns on 1st Embodiment of this invention. (A)-(d) is a top view of the modification of the ship which concerns on 1st Embodiment of this invention. It is a graph showing the result of a 1st verification test. It is a graph showing the result of a 2nd verification test. It is a graph showing the result of a 3rd verification test. It is a graph showing the result of a 4th verification test. It is a longitudinal cross-sectional view of the principal part of the ship which concerns on 2nd Embodiment of this invention. It is a perspective view of the mounting frame of the ship shown in FIG. It is a top view of the principal part of the ship shown in FIG.

(First embodiment)
Hereinafter, a ship (floating body) according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the ship 1 includes a ship body (floating body body) 2 that floats on the water, and a sway reduction device 3 that reduces the sway of the ship body 2.

As shown in FIGS. 1 and 2, the ship body 2 has a substantially rectangular parallelepiped shape, and the ship body 2 has a substantially rectangular shape in a longitudinal sectional view. The ship body 2 is parallel to the horizontal direction. It has a bottom surface 4.
As shown in FIG. 2, the anchor (side surface) 5 facing the short width direction (width direction) L2 in the ship body 2 extends along the water depth direction L1 (vertical direction).

  Moreover, as shown in FIG. 1, the width dimension (width | variety of the ship main body 2) B along the transversal width direction L2 of the ship main body 2 is about 40 m, for example. Here, the natural period of the ship body 2 is determined based on the width dimension B along the short width direction L2 of the ship body 2. The magnitude of the shaking of the ship body 2 changes depending on the relationship between the natural period of the ship body 2 and the wave period of the incident wave applied to the ship body 2 along the short width direction L2. . In addition, the magnitude | size of the ship main body 2 becomes large when the natural period and the wave period are near.

  The sway reduction device 3 includes a pair of flat plates 6 and 7 that can be attached to the ship body 2 via a mounting member (not shown). As shown in FIG. 2, the pair of flat plates 6 and 7 are solid and dense plates whose longitudinal sectional view is substantially rectangular, and as shown in FIG. It is mounted separately on both sides 5 facing the direction L2.

  In the illustrated example, the first flat plate 6 disposed on one side L21 in the lateral width direction L2 with respect to the ship body 2 and the second flat plate 7 disposed on the other side L22 opposite to the one side L21. Are arranged so as to be line symmetric with respect to an axis of symmetry O extending through the center in the lateral width direction L2 and extending in the longitudinal width direction L3 in the top view shape of the ship body 2. Furthermore, the top view shape of the flat plates 6 and 7 is a rectangular shape that is long in the longitudinal width direction L3 of the ship body 2, and the flat plates 6 and 7 extend continuously along the longitudinal width direction L3. The ratio D / B between the width dimension D along the short width direction L2 of the flat plates 6 and 7 and the width dimension B along the short width direction L2 of the ship body 2 is, for example, 0.02 or more and 0 .2 or less. In the illustrated example, the width dimension D along the short width direction L2 of the flat plates 6 and 7 is, for example, about 2 m, and the width dimension D and the width dimension B along the short width direction L2 of the ship body 2 are illustrated. The ratio D / B is 0.05.

Further, as shown in FIG. 2, the flat plates 6 and 7 have a narrowing gap 9 between the boundary portion 11 and the boundary portion 11 on the water bottom side in the depth direction L1 with respect to the boundary portion 11 between the anchor 5 and the bottom surface 4 in the ship body 2. It is arranged along the substantially horizontal direction. In the illustrated example, the boundary portion 11 is configured by a bilge portion 10 that is a joint portion between the bottom surface 4 and the anchor 5 in the ship main body 2.
Note that the substantially horizontal direction allows a width of about ± 30 ° with respect to the horizontal direction. In the illustrated example, the flat plates 6 and 7 are arranged along the horizontal direction. Are parallel to the horizontal direction.

  Moreover, along the short width direction L2 between the said boundary part 11 of the ship main body 2, and the inner edge 8 located inside the ship main body 2 along the short width direction L2 in the flat plates 6 and 7. The second ratio C / B of the distance (clearance) C and the width dimension B along the short width direction L2 of the ship body 2 is 0.05 or less, preferably 0.025 or less. In addition, when the said boundary part 11 is comprised by the bilge part 10 like this embodiment, the said distance C is the upper end edge 10b of the bilge part 10, ie, the lower end edge of the eaves 5 of the ship main body 2, and a flat plate. It means the distance along the short width direction L2 between the inner edge 8 of 6 and 7.

  In the illustrated example, the inner end edge 8 of the flat plates 6 and 7 is closer to the inner side of the ship body 2 along the lateral width direction L2 than the boundary portion 11 (the upper edge 10b of the bilge part 10) of the ship body 2. It is shifted. For example, when the width dimension B along the short width direction L2 of the ship body 2 is 40 m, the boundary portion 11 and the flat plate 6 of the ship body 2 such that the second ratio C / B satisfies 0.05 or less. , 7 along the lateral width direction L2 between the inner end edge 8 and the ship body 2 such that the second ratio C / B satisfies 0.025 or less. The distance C along the lateral width direction L2 between the boundary portion 11 and the inner edge 8 of the flat plates 6 and 7 is 1.0 m or less.

  In the present embodiment, the first ratio A / B between the distance A along the water depth direction L1 of the throttle gap 9 and the width dimension B along the short width direction L2 of the ship body 2 is 0.025 or more. It is 0.1 or less. Here, when the said boundary part 11 is comprised by the bilge part 10 like this embodiment, the distance A along the water depth direction L1 of the throttle gap 9 is the lower end edge 10a of the bilge part 10 of the ship main body 2. And the distance between the inner edge 8 of the flat plates 6 and 7 along the water depth direction L1.

  In the illustrated example, the distance A along the water depth direction L1 of the aperture gap 9 is about 1.0 m, for example, and the first ratio A / B is 0.025. For example, when the width dimension B along the short width direction L2 of the ship body 2 is 40 m, the water depth direction L1 of the narrowing gap 9 such that the first ratio A / B satisfies 0.025 or more and 0.1 or less. The distance A along the line is 1.0 m or more and 4.0 m or less.

Next, the operation of the ship 1 configured as described above will be described by taking as an example a case where an incident wave is applied to the ship body 2 from the other side L22 in the short width direction L2.
When an incident wave is applied to the ship body 2 from the other side L22 in the short width direction L2, the ship body 2 swings and rolls around a virtual axis (not shown) extending in the longitudinal width direction L3 in the horizontal direction. 3, the 1st flat plate 6 moves to the water bottom side of the water depth direction L1 with the one side L21 of the ship main body 2. As shown in FIG. Then, the movement of the ship body 2 caused by the incident wave and the relative water particle motion or flow generated by the incident wave itself pass through the throttle gap 9 while being inhibited by the first flat plate 6, and from the throttle gap 9 to one side L21. It will be blown out towards. Thereby, it becomes possible to generate the vortex U to cause energy dissipation, and to reduce the shaking of the ship body 2.

When the wave period of the incident wave is a period in the vicinity of the natural period of the ship body 2 and the ship body 2 synchronizes with the incident wave, the phase difference between the movement of the ship body 2 and the wave forced moment is 90 degrees, and the directions of the movement of the flat plates 6 and 7 and the movement of the water particles due to the waves are opposite. Thereby, it becomes possible to promote generation | occurrence | production of the vortex U, and the above-mentioned effect will be achieved notably.
Further, even when an incident wave is applied to the ship body 2 from the one side L21 in the short width direction L2, the second flat plate 7 achieves the same action as the first flat plate 6, and the ship main body 2 Shaking can be reduced.

  As described above, according to the ship 1 according to the present embodiment, the water particles moved by the incident wave are allowed to pass through the aperture gap 9 to cause energy dissipation and reduce the shaking of the ship body 2. Can do.

Further, the first ratio A / B is 0.025 or more and 0.1 or less, and the first ratio A / B is a range in which the above-described operation and effect achieved by providing the aperture gap 9 becomes remarkable. Therefore, the fluctuation of the ship body 2 can be effectively reduced.
That is, when the first ratio A / B is smaller than 0.025, the flat plates 6 and 7 are too close to the boundary portion 11 of the ship body 2 (in the illustrated example, the lower edge 10a of the bilge portion 10). 6 and 7 receive a large wave force of the incident wave. On the other hand, if the first ratio A / B is larger than 0.1, the aperture gap 9 becomes too large, and even if the water particles moved by the incident wave pass through the aperture gap 9, the ship body 2 is shaken. It may not be possible to cause enough energy dissipation to reduce.

  Furthermore, since the second ratio C / B is 0.05 or less, the above-described effects can be reliably achieved. That is, when the second ratio C / B is greater than 0.05, sufficient energy dissipation is achieved to reduce the shaking of the ship body 2 even if the water particles moved by the incident wave pass through the aperture gap 9. May not be possible.

  In addition, since the pair of flat plates 6 and 7 can be separately mounted on both sides 5 of the ship body 2, the light enters the ship body 2 from either the one side L21 or the other side L22 in the lateral width direction L2. Even if a wave is applied, the swaying of the ship body 2 can be reduced.

  In the present embodiment, the flat plates 6 and 7 are arranged along the horizontal direction, and the upper and lower surfaces of the flat plates 6 and 7 are parallel to the horizontal direction. However, the flat plates 6 and 7 are arranged along the substantially horizontal direction. If it is done, it will not be restricted to this, for example, it goes gradually toward the bottom of the water depth direction L1 from the inner side to the outer side of the ship body 2 along the short width direction L2, or toward the water surface side of the water depth direction L1. It may be.

Further, in the present embodiment, the boundary portion 11 of the ship body 2 is configured by the bilge portion 10, but is not limited to this, and the boundary portion of the ship body 2 is similar to the ship 1 </ b> A illustrated in FIG. 4. 11 may be comprised by the bilge part 10 and the bilge keel 12 arrange | positioned by this bilge part 10. FIG. The bilge keel 12 protrudes from the bilge portion 10 so as to gradually go toward the bottom of the water depth direction L1 as it goes to the outside of the ship body 2 along the short width direction L2. In the illustrated example, the tip edge 12a of the bilge keel 12 is located outside the ship body 2 along the lateral width direction L2 with respect to the eaves 5 of the ship body 2 and the upper edge 10b of the bilge part 10, and The bottom surface 4 of the main body 2 and the bottom edge 10a of the bilge part 10 are located on the water bottom side in the water depth direction L1.
In this case, the distance A along the water depth direction L1 of the throttle gap 9 means the distance along the water depth direction L1 between the tip edge 12a of the bilge keel 12 and the inner edge 8 of the flat plates 6 and 7. . Further, the distance C along the short width direction L2 between the boundary portion 11 of the ship body 2 and the inner edge 8 of the flat plates 6 and 7 is the tip edge 12a of the bilge keel 12, the flat plate 6, 7 and the inner end edge 8 of FIG. 7 means the distance along the short width direction L2.

Moreover, in this embodiment, although the flat plates 6 and 7 shall be continuously extended along the longitudinal width direction L3 of the ship main body 2, it is not restricted to this. For example, as shown in FIGS. 5A and 5B, the flat plates 6 and 7 may extend intermittently along the longitudinal width direction L <b> 3 of the ship body 2.
Further, in the present embodiment, the first flat plate 6 and the second flat plate 7 are arranged so as to be line symmetric with respect to the symmetry axis O, but the present invention is not limited to this. For example, as shown in FIG. 5C, the first flat plate 6 and the second flat plate 7 do not have to be line-symmetric with respect to the symmetry axis O.
In the present embodiment, the second flat plate 7 is provided. However, the present invention is not limited to this, and the second flat plate may be omitted as shown in FIG.

Further, in the present embodiment, the bottom surface 4 of the ship body 2 is parallel to the horizontal direction, and the anchor 5 of the ship body 2 extends along the water depth direction L1, but this is not a limitation. .
Furthermore, in this embodiment, although 2nd ratio C / B shall be 0.025 or less, it is not restricted to this.

  Furthermore, in this embodiment, although a pair of flat plate 6 and 7 is made into the dense board, it is not restricted to this, You may have a clearance gap and a hole. In this case, when the relative water particle motion or flow described above passes through the gaps or holes in the flat plate, a vortex is generated, and further energy dissipation can be caused.

(Verification test)
Next, first to fourth verification tests were performed on the operational effects described in the first embodiment.

(First verification test)
In the first verification test, the relationship between the first ratio A / B and the wave force of the incident wave received by the flat plates 6 and 7 was verified. In this verification test, a total of 5 examples including Examples 1 to 3 and Comparative Examples 1 and 2 were performed.

In each of Examples 1 to 3 and Comparative Examples 1 and 2, the 1/100 scale configuration of the ship body 2 shown in the first embodiment was adopted. That is, the width dimension B along the short width direction L2 of the ship body 2 was set to 400 mm.
In Examples 1 to 3 and Comparative Example 1, the 1/100 scale configuration of the flat plates 6 and 7 shown in the first embodiment was adopted. That is, the width dimension D along the short width direction L2 of the flat plates 6 and 7 was 20 mm. Furthermore, the inner edge 8 of the flat plates 6 and 7 is shifted to the outside of the ship body 2 along the short width direction L2 with respect to the boundary portion 11 (the upper edge 10b of the bilge part 10) of the ship body 2. The distance C between the boundary portion 11 of the ship body 2 and the inner edge 8 of the flat plates 6 and 7 along the short width direction L2 is 1 mm. In Comparative Example 2, the plates 6 and 7 were not attached to the ship body 2.

Further, in Examples 1 and 2, the distance A along the water depth direction L1 of the aperture gap 9 is both 40 mm, in Example 3, the distance A is 10 mm, and in Comparative Example 1, the distance A is 8 mm. did. That is, in Examples 1 and 2, the first ratio A / B is 0.1, in Example 3, the first ratio A / B is 0.025, and in Comparative Example 1, the first ratio A / B is 0.025. B is 0.02.
In the first embodiment, the flat plates 6 and 7 are configured to continuously extend along the longitudinal width direction L3 of the ship body 2 as shown in FIG. The structure which intermittently extends along the longitudinal width direction L3 of the ship main body 2 as shown to 5 (a) was employ | adopted.

  In each of Examples 1 to 3 and Comparative Examples 1 and 2, a plurality of types of incident waves having different wave periods are sent from the other side L22 toward the one side L21 along the lateral width direction L2 to the ship body 2. In addition, the wave force applied to the first flat plate 6 at this time was measured.

The verification result is shown in FIG. The horizontal axis of the graph shown in FIG. 6 is the wave period of the incident wave, and the vertical axis is the measured value of the wave force received by the first flat plate 6.
From this result, it was confirmed that the wave force which the 1st flat plate 6 receives becomes large, so that 1st ratio A / B becomes small. And when 1st ratio A / B is 0.02 (comparative example 1), it receives a very large wave force compared with the case where 1st ratio A / B is 0.025 (example 3). confirmed. In particular, when the first ratio A / B is 0.02, when the wave period is within the range R1 shown in FIG. It was confirmed that the wave force was extremely large compared to 025.

(Second verification test)
In the second verification test, the relationship between the first ratio A / B and the fluctuation of the ship body 2 was verified. In this verification test, a total of 5 examples of Examples 1 to 3 and Comparative Examples 2 and 3 were carried out.

In all of Examples 1 to 3 and Comparative Example 2, the same ship 1 as in Examples 1 to 3 and Comparative Example 2 of the first verification test was used.
Comparative Example 3 was different from Comparative Example 1 of the first verification test only in the distance A along the water depth direction L1 of the aperture gap 9, and the distance A was 44 mm. That is, in Comparative Example 3, the first ratio A / B is 0.11.

  In all of Examples 1 to 3 and Comparative Examples 2 and 3, a plurality of types of incident waves having different wave periods are sent from the other side L22 toward the one side L21 along the short width direction L2 to the ship body 2. In addition to the above, the amount of roll amplitude of the ship body 2 was measured.

The verification result is shown in FIG. The horizontal axis of the graph shown in FIG. 7 is the wave period of the incident wave, and the vertical axis is the amplitude of the roll of the ship body 2.
From this result, when the first ratio A / B is 0.025 and 0.1 (Examples 1 to 3), the ship body 2 is more unstable than when the flat plates 6 and 7 are not mounted. It was confirmed that it was reduced. When the first ratio A / B is 0.11 (Comparative Example 3), the ship body 2 is much larger than when the first ratio A / B is 0.1 (Examples 1 and 2). It was confirmed that the ship body 2 was shaken to the same extent as when the flat plates 6 and 7 were not mounted (Comparative Example 2). In particular, when the flat plates 6 and 7 are not attached and when the first ratio A / B is 0.11, the range R2 shown in FIG. 7 in which the wave period is 0.6 seconds or more and 0.9 seconds or less. It was confirmed that the ship body 2 swayed significantly when compared with the case where the first ratio A / B was 0.1.

(Third verification test)
In the third verification test, the relationship between the second ratio C / B and the fluctuation of the ship body 2 was verified.

  In this verification test, a ship 1 having the same configuration as that used in Example 3 of the first verification test was used. And while changing the distance C along the lateral width direction L2 between the boundary portion 11 of the ship body 2 and the inner edge 8 of the first flat plate 6 to a plurality of values, the wave period and the amplitude are constant. An incident wave was applied along the short width direction L2 from the other side L22 toward the one side L21 in addition to the ship body 2, and the amount of roll amplitude of the ship body 2 was measured.

The verification result is shown in FIG. The horizontal axis of the graph shown in FIG. 8 is the distance C (cm) along the lateral width direction L2 between the boundary portion 11 of the ship body 2 and the inner edge 8 of the first flat plate 6, and the vertical axis Is an evaluation index (dimensionless value) of the amplitude of the ship body 2. This amplitude amount evaluation index is the amount of roll amplitude of the ship body 2 measured on the ship 1 when the ship body 2 is not equipped with the sway reduction device 3 (that is, the comparison of the first verification test). In the case of Example 2), the ratio is made dimensionless by dividing by the amount of amplitude of the roll of the ship body 2 measured in the case of Example 2. When the evaluation index of this amount of amplitude is 1, the effect of reducing the shaking is successful. Indicates that it has not been.
The distance C is set to 0 when the position in the short width direction L2 between the boundary portion 11 of the ship body 2 (upper edge 10b of the bilge portion 10) and the inner edge 8 of the first flat plate 6 is equal. A case where the first flat plate 6 is shifted to the outside of the ship body 2 along the short width direction L2, and a case where the first flat plate 6 is shifted to the inside of the ship body 2 along the short width direction L2. Negative.

  From this result, when the distance C along the lateral width direction L2 between the boundary portion 11 of the ship body 2 and the inner edge 8 of the first flat plate 6 is 0, that is, the second ratio C / B is 0. At that time, it was confirmed that the fluctuation of the ship body 2 was most reduced. Further, when the distance C is −2.0 cm or more and 2.0 cm or less, that is, the second ratio C / B is 0.05 or less, the amplitude amount of the ship body 2 can be effectively suppressed, and the effect can be sufficiently expected. Was confirmed. Further, when the distance C is -1.0 cm or more and 1.0 cm or less, that is, when the second ratio C / B is 0.025 or less, the amplitude amount of the ship body 2 is further effectively suppressed, which is extremely effective. It was confirmed.

(Fourth verification test)
In the fourth verification test, the relationship between the shape of the flat plates 6 and 7 and the fluctuation of the ship body 2 was verified. In this verification test, a total of three examples, Examples 1 and 2 and Comparative Example 2, were performed.

In each of Examples 1 and 2, the same ship 1 as in Examples 1 and 2 of the first verification test was used. Moreover, the comparative example 2 used the ship 1 similar to the comparative example 2 of the said 1st verification test.
In each of Examples 1 and 2 and Comparative Example 2, a plurality of types of incident waves having different wave periods are applied to the ship body 2 from the other side L22 toward the one side L21 along the lateral width direction L2. The amplitude of the roll of the ship body 2 was measured.

The verification result is shown in FIG. The horizontal axis of the graph shown in FIG. 9 is the wave period of the incident wave, and the vertical axis is the amplitude of the roll of the ship body 2.
From this result, even if the configuration (Example 1) that continuously extends along the longitudinal width direction L3 of the ship body 2 is adopted as the flat plates 6 and 7, intermittently along the longitudinal width direction L3 of the ship body 2 Even if the configuration (Example 2) extending in the above is adopted, it was confirmed that the fluctuation of the ship body 2 was reduced as compared with the case where the flat plates 6 and 7 were not attached (Comparative Example 2). In particular, in any case where the configuration extends continuously along the longitudinal width direction L3 of the ship body 2 and the configuration extends intermittently along the longitudinal width direction L3 of the ship body 2, the wave period is 0.6 seconds or more. It was confirmed that the fluctuation of the ship body 2 was effectively reduced when it was within the range R3 shown in FIG.

(Second Embodiment)
Next, the ship 20 of 2nd Embodiment which concerns on this invention is demonstrated with reference to FIGS.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 10, the ship body 2 of the ship 20 of the present embodiment is in a state where it is in contact with a contact object 21 such as a quay (port or land facility), a ship, a floating pier, a floating parking lot, or the like. Parked on the water.
It should be noted that the term “welding” means that the ships attach the dredging side to each other, or that the marching target 21 and the ship body 2 are arranged in parallel with the side surfaces 5 and 21a (side wall surface, dredging) facing each other. In the state where the object 21 and the ship main body 2 are in contact with each other, traffic of people, goods, etc. is possible between the two.

  In addition, the sway reduction device 3 is detachably attached to the anchor 5 of the ship body 2 and has a mounting frame 22 in which the flat plates 6 and 7 are attached to the bottom 22a, and the ship body along the short width direction L2 in the mounting frame 22. 2 is provided with a cushioning material 23 attached to the outer side portion 22b facing the outer side of 2, and a floor surface material 24 attached to the top portion 22c of the mounting frame 22 and positioned on the water.

As shown in FIG. 11, the mounting frame 22 has a skeleton structure whose outer shape is a rectangular parallelepiped shape, and the strength of the mounting frame 22 is a contact load that acts when the ship body 2 contacts the contact target 21. It can be tolerated. As shown in FIG. 12, the top view shape of the mounting frame 22 has a long rectangular shape in the longitudinal width direction L <b> 3 of the ship body 2. The size of the mounting frame 22 along the longitudinal width direction L3 is smaller than that of the ship body 2, and a plurality of mounting frames 22 are arranged along the longitudinal width direction L3.
As shown in FIG. 10, the outer portion 22 b and the cushioning material 23 of the mounting frame 22 are located outside the ship body 2 along the lateral width direction L <b> 2 than the flat plates 6 and 7.

  As shown in FIG. 11, the side view shape of the cushioning material 23 viewed from the short width direction L2 is a long rectangular shape in the longitudinal width direction L3 of the ship body 2, and the entire length of the mounting frame 22 in the longitudinal width direction L3. Attached over. As shown in FIG. 10, the buffer material 23 comes into contact with the side surface 21 a (for example, a side wall surface of a quay or a dredger of another ship) of the object 21 to be contacted with the ship body 2. 21 is in contact.

As shown in FIG. 11, the top surface shape of the floor material 24 is the same shape and size as the top surface shape of the mounting frame 22, and the floor material 24 is attached to the top portion 22 c of the ship body 2 over the entire surface. Yes. The floor covering 24 may have a watertight structure or a water flow structure.
The flat plates 6 and 7 are attached to the bottom 22a of each mounting frame 22 separately. Thereby, the flat plates 6 and 7 will intermittently extend along the longitudinal width direction L3 of the ship body 2. In the illustrated example, the size of the flat plates 6 and 7 along the short width direction L2 is larger than the size of the bottom portion 22a of the mounting frame 22 along the short width direction L2. The inner edge 8 extends from the mounting frame 22 to the inside of the ship body 2 along the short width direction L2.

Here, as shown in FIG. 10, the flat plates 6 and 7 can be attached to and detached from the side of the ship body 2 via the mounting frame 22 and the mounting member 25 attached to the mounting frame 22.
As shown in FIG. 12, a plurality of (two in the illustrated example) attachment members 25 are attached to the attachment frame 22 at intervals in the longitudinal width direction L3.

  As shown in FIG. 10, the mounting member 25 is attached to an inner part 22d facing the inner side of the ship body 2 along the short width direction L2 in the mounting frame 22 and extends along the water depth direction L1. 26 and a cross member 27 projecting from the upper end portion of the longitudinal member 26 toward the inside of the ship body 2 along the short width direction L2.

  The vertical member 26 is formed in a rod shape sandwiched between the inner portion 22d of the mounting frame 22 and the eaves 5 of the ship body 2, and the lower end portion of the vertical member 26 is directed toward the bottom of the water depth direction L1. A concave portion 27a that is opened is formed. As shown in FIG. 12, the cross-sectional shape of the cross member 27 is T-shaped.

  On the other hand, as shown in FIG. 10, a mounted member 28 to which the mounting member 25 is detachably mounted is attached to the ship body 2. The mounted member 28 includes a horizontal restricting portion 29 that restricts movement of the mounting member 25 in the horizontal direction, a vertical restricting portion 30 that restricts movement of the mounting member 25 in the water depth direction L1, and a bottom of the mounting member 25 in the depth direction L1. And a support portion 31 supported from the side.

As shown in FIG. 12, the horizontal restricting portion 29 includes a pair of L-shaped members 29 a that are L-shaped when viewed from above, and are arranged on the upper surface of the ship body 2 at intervals in the longitudinal width direction L <b> 3. A cross member 27 of the mounting member 25 is fitted between the L-shaped members 29a.
As shown in FIG. 10, the vertical restricting portion 30 is formed in an inverted U shape when viewed from the side, and includes a cross member 27 fitted between a pair of L-shaped members 29 a and an L-shaped member 29 a. It is attached to the upper surface of the ship body 2 so as to be detachable from above so as to be sandwiched in the short width direction L2.
The support portion 31 is attached to the cage 5 of the ship body 2. Further, the support portion 31 is formed with a convex portion 31a that protrudes toward the water surface side in the depth direction L1 and is fitted into the concave portion 27a of the longitudinal member 26 of the mounting member 25.

Further, as shown in FIG. 12, the mounting frames 22 adjacent to each other in the longitudinal width direction L3 are engaged with each other, thereby restricting relative movement of these mounting frames 22 along the horizontal direction. Means 32 are attached.
The engaging means 32 includes a male member 33 attached to one end portion on the one side in the longitudinal width direction L3 in the mounting frame 22, and a female member attached to the other end portion on the other side in the longitudinal width direction L3 in the mounting frame 22. 34.

The male member 33 is formed in a T-shape in a top view with a front end projecting in the longitudinal width direction L3 at one end of the mounting frame 22 and having a wide end.
The female member 34 is composed of a pair of L-shaped members 34a that protrude from the other end of the mounting frame 22 in the longitudinal width direction L3 and are spaced from each other in the lateral width direction L2. The pair of L-shaped materials L-shaped material 34a has an L-shape in a top view that extends from the other end of the mounting frame 22 in the longitudinal width direction L3 and is bent so as to be close to each other. A male member 33 is fitted between the character members 34a.

Next, a method of attaching / detaching the mounting frame 22 to / from the ship body 2 in the ship 20 configured as described above will be described.
As shown in FIG. 10, when the mounting frame 22 is detached from the ship body 2, first, the vertical regulating portion 30 of the mounted member 28 is detached from the ship body 2, and the movement of the mounting member 25 in the water depth direction L <b> 1 is performed. For example, the mounting frame 22 is supported from above by a lifting device 35 (a crane, a David, or the like) provided in the ship body 2 while releasing the restriction.

Thereafter, the mounting frame 22 is pulled upward by the coin lifting device 35. As a result, the cross member 27 of the mounting member 25 is extracted upward from the horizontal regulating portion 29 of the mounted member 28. At this time, in the mounting frame 22 adjacent to each other in the longitudinal width direction L3, the male member 33 and the female member 34 are relatively moved in the water depth direction L1, and the male member 33 is extracted from the female member 34.
As a result, the restriction on the movement of the mounting frame 22 in the horizontal direction is released. Thereafter, the mounting frame 22 is moved by the lifting device 35 and accommodated in the ship body 2, for example.

  When the mounting frame 22 is mounted on the ship body 2, first, the mounting frame 22 is first suspended by, for example, the lifting device 35 and lowered toward the side 5 of the ship body 2. At this time, by lowering the mounting frame 22 while positioning, the cross member 27 of the mounting member 25 is brought close to the horizontal restricting portion 29 of the mounted member 28 from above, and the cross member 27 is moved into the horizontal restricting portion 29 from above. Insert it. At this time, when the mounting frame 22 is mounted at a position adjacent in the longitudinal width direction L3, the male member 33 and the female member 34 are moved in the water depth direction L1 between the mounting frame 22 at the adjacent position. The male member 33 is inserted into the female member 34 by being relatively close to each other.

As described above, the horizontal movement of the mounting frame 22 is restricted. After that, after the support of the mounting frame 22 by the lifting device 35 is released, the vertical restricting portion 30 of the mounted member 28 is mounted on the ship main body 2, and the movement of the mounting member 25 in the water depth direction L1 is controlled, thereby mounting The mounting of the frame 22 is completed.
Thus, the mounting frame 22 can be attached to and detached from the ship body 2 by moving the mounting frame 22 up and down in the water depth direction L1 with respect to the ship body 2.

As described above, according to the ship 20 according to the present embodiment, the flat plates 6 and 7 can be attached to and detached from the side of the vessel 5 of the ship main body 2, so that the water depth is shallow and the flat plates 6 and 7 are in contact with the bottom of the water. The ship body 2 can be floated by detaching the flat plates 6 and 7 from the ship body 2 even on shallow water.
For example, when the ship body 2 is moved (towed or sailed) on the water, the fluid resistance during movement caused by the flat plates 6 and 7 is increased by detaching the flat plates 6 and 7 from the ship body 2. (Decrease in moving speed) can be avoided.

In addition, since the flat plates 6 and 7 are attached to the bottom 22a of the mounting frame 22, the above-described effects can be reliably achieved.
Furthermore, since the mounting frame 22 can be attached to and detached from the ship main body 2 by moving the mounting frame 22 up and down in the water depth direction L1 with respect to the ship main body 2, the mounting frame 22 can be attached and detached by, for example, the lifting device 35. It becomes possible. Therefore, the mounting frame 22 and the flat plates 6 and 7 can be easily attached to and detached from the ship body 2 even offshore from the quay.

  Moreover, since the flat plates 6 and 7 can be easily attached to and detached from the vessel main body 2 in this way, the arrangement of the flat plates 6 and 7 with respect to the vessel main body 2 can be easily changed. Therefore, the arrangement of the flat plates 6 and 7 can be easily changed according to the direction in which the incident wave is applied and the expected degree of reduction of the shake of the ship body 2, and the shake of the ship body 2 is more effective. Can be reduced.

Further, since the ship body 2 and the contact object 21 come into contact with each other due to the buffer material 23 coming into contact with the side surface 21a of the contact object 21, the ship along the short width direction L2 from the ship 5 of the ship body 2. Even when the flat plates 6 and 7 protrude outside the main body 2, the contact target 21 and the ship main body 2 are brought into contact with each other without bringing the flat plates 6 and 7 into contact with the side surface 21 a of the contact target 21. be able to. Therefore, it is possible to prevent the side surface 21a and the flat plates 6 and 7 of the contact target 21 from being damaged when the contact target 21 and the ship body 2 are contacted.
Since the floor material 24 is attached to the top portion 22c of the mounting frame 22, the floor material is used when the object 21 and the ship body 2 are brought into contact with each other and people or goods are brought between them. 24 can be carried out smoothly.

In the present embodiment, the sway reduction device 3 includes the cushioning material 23 and the floor surface material 24, but these may be omitted.
In the present embodiment, the inner edges 8 of the flat plates 6 and 7 are projected from the mounting frame 22 to the inside of the ship main body 2 along the lateral width direction L2, but may not be projected. .

  In this embodiment, the mounting frame 22 can be attached to and detached from the rod 5 of the ship body 2 via the mounting member 25. The configuration is not limited to this.

In the present embodiment, the flat plates 6 and 7 are detachably attached to the side of the boat 5 of the ship body 2 via the mounting frame 22 and the mounting member 25, but may be attached to the side of the boat 5 of the ship body 2. For example, the configuration is not limited to that shown in the present embodiment.
Further, the flat plates 6 and 7 do not have to be detachable from the side of the ship 5 of the ship body 2.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in each of the above embodiments, the ship body 2 is employed as the floating body, but the present invention is not limited to this as long as it floats on the water, and a floating pier, a floating parking lot, or the like can also be employed as the floating body. .

  Moreover, in each said embodiment, although the flat plates 6 and 7 shall be mounted | worn with the eaves 5 side which faces the transversal width direction L2 of the ship main body 2, it is not restricted to this, The longitudinal width of a floating body main body It may be configured to be mounted on the side surface facing the direction (width direction) L3.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1, 1A, 20 Ship (floating body)
2 Ship body (floating body)
3 Shake reduction device 4 Bottom 5 底面 (side)
6, 7 Flat plate 8 Inner edge 9 Drawing gap 10 Bilge part 11 Boundary part 21 Contact object 21a Side face 22 Mounting frame 22a Bottom part 22b Outer part 22c Top part 23 Buffer material 24 Floor material L1 Water depth direction L2 Short width direction (width) direction)

Claims (5)

A sway reduction device comprising a flat plate that can be attached to the side facing the width direction in the floating body body floating on the water,
The flat plate is arranged along the substantially horizontal direction with a narrowing gap between the boundary portion and the bottom of the water body in the depth direction from the boundary portion between the side surface and the bottom surface of the floating body.
The aperture gap, when an incident wave is applied to the floating body and the floating body is tilted by rolling, causes water particles to pass through and generates vortices,
A first ratio A / B between a distance A along the water depth direction of the narrowing gap and a width dimension B along the width direction of the floating body is 0.025 or more and 0.1 or less. The vibration reduction device characterized by that. The sway reduction device according to claim 1,
A distance C along the width direction between the boundary portion and an inner edge located inside the floating body along the width direction in the flat plate, and a width along the width direction of the floating body. The vibration reduction device, wherein the second ratio C / B of the dimension B is 0.05 or less. The vibration reduction device according to claim 1 or 2,
The vibration reducing device according to claim 1, wherein the flat plate is detachable from the side surface of the floating body. The vibration reduction device according to claim 3,
A mounting frame that is detachably attached to the side surface of the floating body;
The vibration reducing device, wherein the flat plate is attached to a bottom portion of the mounting frame. A floating body floating on the water,
A floating body comprising the fluctuation reducing device according to any one of claims 1 to 4.

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