WO2016129141A1 - 動揺低減装置及びこれを備えた浮体 - Google Patents
動揺低減装置及びこれを備えた浮体 Download PDFInfo
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- WO2016129141A1 WO2016129141A1 PCT/JP2015/076289 JP2015076289W WO2016129141A1 WO 2016129141 A1 WO2016129141 A1 WO 2016129141A1 JP 2015076289 W JP2015076289 W JP 2015076289W WO 2016129141 A1 WO2016129141 A1 WO 2016129141A1
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- floating body
- plate portion
- shape
- plate
- fin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
Definitions
- the present invention relates to a sway reduction device mounted on a floating body and a floating body including the same.
- floating structures (hereinafter also simply referred to as floating bodies) have been widely applied as water facilities such as oceans, lakes, and rivers.
- floating bodies include various work boats, drill ships, oil production platforms, floating piers, floating warehouses, and floating parking lots. Since it is not necessary to install a support column on the bottom of the water, the structure of the floating body can be simplified. On the other hand, since the wave enters and shakes the floating body, it is necessary to reduce the shaking of the floating body.
- Patent Document 1 describes a technique in which a plate is suspended within a predetermined distance from the seabed, and the vibration is reduced by a fluid force acting on the plate in anticipation of an increase in additional mass and viscous damping force.
- Patent Document 2 an inclined plate inclined to the upstream side of the wave traveling direction and extending from the vicinity of the waterline of the floating body to the vicinity of the lower surface depth is attached to the side of the wave incident side of the floating body. A technique to be illustrated is described.
- Patent Document 3 a vertical plate extending downward from the bottom surface of the floating body is arranged at the lower end of the side portion on the wave incident side with a space that allows water to flow through the floating body, the vertical plate can be tilted, A technique for reducing the shaking by tilting is described.
- Patent Document 4 describes a technique for reducing fluctuation by reducing the influence of wave force by setting the ratio of the width of the box-shaped floating body to the flooded water to the ratio of the length and width of the box-shaped floating body. Has been.
- the present invention is intended to solve such a problem, and without causing an increase in the size of the apparatus, it is possible to reliably obtain a floating body sway reduction effect with a simple structure, and to suppress an increase in resistance when towing the floating body.
- the fluctuation reducing device of the present invention is arranged at the corner portion between the side surface and the bottom surface of the floating body with a base end spaced from the corner portion, and the floating body is located near the tip.
- the support portion functions as a resistance surface that blocks a water flow that is about to advance toward the storage position, and the storage portion stores the plate portion in a use position and a recess formed in the vicinity of the corner portion of the floating body. It has a movable mechanism that moves between
- the movable mechanism includes a link member interposed in a swingable manner between the plate portion and the wall portion of the recess, and the link between the plate portion and the wall portion of the recess. It is preferable to have a telescopic actuator arranged in parallel with the member.
- the plate portion has an outer surface having a shape that follows the outer surface shape of the floating body around the storage location where the recess is formed at the storage position.
- the plate portion has a flat plate shape and is used in a state of being horizontally oriented at the use position, and the storage location is arranged at a location where the outer surface shape of the floating body is formed in a flat shape. It is preferable.
- the plate portion is in a flat plate shape, and is used in a state where the front end is inclined toward the outside and the lower side of the side surface of the floating body at the use position, and the outer surface shape of the floating body is flat. It is preferable that the storage location is arranged in the formed location.
- the plate portion includes an inclined portion extending obliquely downward outside the side surface of the floating body from the vicinity of the corner portion, and a vertical portion bent from the inclined portion and extending vertically downward. It is preferable that the storage location is arranged in the corner portion which is formed into a bent shape and has the bent shape of the floating body.
- the size of the gap between the base portion of the plate portion and the corner portion is determined by a region in which the water flow guided to the bottom surface of the plate portion and entering the bottom surface from the gap is in the vicinity of the corner portion of the bottom surface. In order to form a high-speed laminar flow, it is preferably set small.
- the said board part is installed over the full length of the said side surface of the said floating body.
- the floating body of the present invention has a corner portion between a side surface and a bottom surface, and the corner portion is equipped with the above-described vibration reduction device.
- the sway reduction device is installed on each of the side surfaces on both sides of the floating body.
- the upward surface of the plate portion functions as a guide surface, and collects the water flow that enters the side surface from the outside of the side surface by the wave pushing waves, and the base portion and the corner portion of the plate portion. Since the water flow is guided toward the gap, the water flow gathers in the gap, and the speed is increased to enter the gap just below the bottom surface. Since the water current flows along the bottom surface at high speed, a negative pressure acts on the lower portion of the bottom surface near the corner portion, and acts on the floating body so as to pull down the bottom surface near the corner portion. The push wave acts on the floating body so as to raise the side surface. However, since the negative pressure acts on the floating body so as to cancel this, the swing of the floating body due to the push wave is suppressed.
- the downward surface of the plate portion functions as a resistance surface, preventing water flow that moves outward from the bottom surface due to the wave pulling of the waves, so that the water flow presses the resistance surface and the bottom surface near the corner portion It acts on the floating body to push it upward.
- the pulling wave acts on the floating body so as to lower the side surface, but the force that presses the resistance surface due to the water flow acts on the floating body so as to cancel this, so that the floating body is prevented from being shaken by the pulling wave.
- the plate part can be moved from the use position to the storage position by the movable mechanism, the plate part can be stored when the floating body is towed so that the plate part does not act as a resistor.
- the floating body can be towed smoothly without causing deterioration of fuel consumption.
- the board part of a use position is made to protrude toward the outer side of a side surface, although it becomes the obstruction of berthing, a floating body can be pierced without trouble by storing a board part.
- FIG. 1 is a perspective view showing a sway reduction device and a floating body including the same according to each embodiment of the present invention.
- 2A to 2D are cross-sectional views of the floating body for explaining the operation principle of the fluctuation reducing device according to each embodiment of the present invention, and FIG. 2A is a diagram for explaining the fluctuation of the floating body not equipped with the present apparatus.
- FIG. 2D is a diagram for explaining the operating principle of this apparatus.
- 3A and 3B are diagrams showing the configuration of the vibration reduction device according to the first embodiment of the present invention, and FIG. 3A is a cross-sectional view of a floating body showing a state in which the fins (plate portions) are in the retracted positions.
- FIG. 3B is a cross-sectional view of the floating body showing a state where the fin is in the use position.
- 4A to 4C are views showing the configuration of the sway reduction device according to the second embodiment of the present invention, and FIG. 4A is a cross-sectional view of a floating body showing a state in which fins (plate portions) are in a storage position.
- 4B and 4C are cross-sectional views of the floating body showing a state where the fin is in the use position.
- 5A and 5B are diagrams showing a configuration of a vibration reduction device according to a third embodiment of the present invention, and FIG. 5A is a cross-sectional view of a floating body showing a state where fins (plate portions) are in a use position.
- FIG. 5B is a cross-sectional view of the floating body showing a state where the fin is in the retracted position.
- FIG. 6 is a cross-sectional view for explaining the shape of a fin (plate part) according to each embodiment.
- FIG. 7 is a cross-sectional view illustrating the shape of a fin (plate portion) according to the third embodiment.
- the vertical upper direction is the upper or upper direction
- the vertical lower side is the lower or lower direction
- the direction toward the center line of the center in the width direction of the floating body is the inner side or the inner side.
- the direction away from the center line will be described as outward or outward.
- FIG. 1 is a perspective view showing a floating body (floating structure) equipped with the fluctuation reducing device according to each embodiment.
- a floating body 1 is a box-shaped (substantially rectangular parallelepiped) having an upper surface portion (upper surface) 2, a lower surface portion (lower surface) 3, both side surface portions (side surfaces) 4, 4, and both end surface portions (end surfaces) 5, 5. ).
- an example in which the sway reduction device 10 is provided on both side surface portions 4 and 4 is shown.
- the sway reduction device 10 includes a fin (plate part) 20, which is omitted in FIG. 1, but supported by a support unit coupled to the floating body 1. ing.
- the fin 20 is arranged at the corner 6 between the side surface 4 and the bottom surface 3 of the floating body 1 with the base end 21 opened from the corner 6 with a gap 7 therebetween, and the tip end protrudes toward the lateral outer side of the floating body 1. Used in the state.
- the fin 20 is formed in a flat plate shape and is disposed horizontally.
- the upward surface 20 a of the fin 20 functions as a guide surface that collects and guides the water flow entering from the outside of the side surface 4 toward the side surface 4 by pushing waves of the waves toward the gap 7. Therefore, the size of the gap 7 is such that the water flow guided by the upward surface 20 a of the fin 20 and entering just below the bottom surface 3 from the gap 7 forms a high-speed laminar flow in the region near the corner 6 of the bottom surface 3. It is preferable to set it small.
- the downward surface 20b of the fin 20 functions as a resistance surface that prevents a water flow that advances outward from the bottom surface 3 due to a wave of waves.
- FIG. 2A when a pressing wave is pushed toward the side surface 4 from the side [left side in FIG. 2A], a clockwise wave forcing moment M1 is applied to the floating body 1 as indicated by the white arrow in FIG. If the fluctuation reducing device 10 is not provided, the floating body 1 will roll.
- the guide surface 20a of the fin 20 collects the water flow that enters the side surface 4 from the outside of the side surface 4 due to the waves of waves. Then, it guides toward the gap 7 between the base 21 and the corner 6 of the fin 20 (see FIG. 2D). Since the water stream gathers in the gap 7 as shown by a single-line arrow and increases the speed and enters the gap immediately below the bottom surface 3 from the gap 7, the water stream flows along the bottom surface 3 while forming a high-speed laminar flow.
- the resistance surface 20b of the fin 20 becomes a resistance to block this water flow, As indicated by the single-line arrow, the resistance surface 20b is pressed, and a force F2 that pushes the bottom surface 3 upward acts on the floating body 1 under the bottom surface 3 near the corner 6 (see FIG. 2D).
- the counterclockwise wave forcing force moment M2 is applied to the floating body 1 by the pulling wave, since the force F2 acts so as to cancel the wave forcing force moment M2, the fluctuation of the floating body 1 due to the pulling wave is suppressed. .
- the sway reduction device 10 uses the guide surfaces 20a of the fins 20 to prevent the water flow WF1 from entering from the outside of the side surface 4 toward the side surface 4 due to the pushing waves of the waves.
- the water flow WF1 is collected and guided from the gap 7 directly below the bottom surface 3, and the water flow WF2 that is going to move outward from the bottom surface 3 by the wave pulling wave is caused by the resistance surface 20b of the fin 20
- the outflow from the gap 7 of the water flow WF2 is prevented.
- Each of the following embodiments is a fluctuation reducing device having the fin 20 that reduces the fluctuation of the floating body 1 as described above, but the fin 20 is stored in a use position and a recess formed in the floating body 1. It is characterized in that it is configured to be movable with respect to the storage position.
- the fluctuation reduction device 10A according to the first embodiment of the present invention will be described.
- the fluctuation reducing device 10 ⁇ / b> A is provided only on the side surface 4 on one side of the floating body 1, and includes a fin 20 and a support 30 ⁇ / b> A that is coupled to the floating body 1 and supports the fin 20.
- the floating body 1 is used by being moored by arranging the side surface 4 on one side equipped with the vibration reduction device 10 ⁇ / b> A in the direction of the open ocean where waves enter.
- the fins 20 are arranged horizontally from the vicinity of the corners 6 toward the outside of the side surface 4 of the floating body 1 at the use position, but obliquely toward the outside of the side surface 4. It may be arranged so as to be inclined downward.
- the upward surface 20a of the fin 20 functions as a guide surface that collects and guides the water flow entering from the outside of the side surface 4 toward the side surface 4 due to the pushing wave of the waves
- the downward surface 20b of the fin 20 is It functions as a resistance surface that prevents the water flow that advances outward from the bottom surface 3 due to the wave pulling of the waves.
- the fins 20 extend in the longitudinal direction of the floating body 1 (the direction in which the corners 6 extend), and the length is set so as to cover the entire length in the longitudinal direction of the floating body 1 or substantially the entire length.
- the fins 20 are supported by the support portion 30A at a plurality of locations in the longitudinal direction, for example, at three locations near both ends and an intermediate portion, or at a plurality of locations near both ends and an intermediate portion.
- the fin 20 is one piece having a length that covers the entire length of the floating body 1 or substantially the entire length.
- the fin 20 is divided into a plurality of portions in the longitudinal direction, and is supported in the same manner as described above by the support portion 30A. May be.
- the support portion 30 ⁇ / b> A has a movable mechanism 32 ⁇ / b> A that moves the fin 20 between a use position and a storage position stored in a recess 3 ⁇ / b> A formed on the bottom surface 3 of the floating body 1.
- the movable mechanism 32A includes a link member 32 swingably interposed between the upper surface of the fin 20 and the wall portion of the recess 3A formed on the bottom surface 3 of the floating body 1, and the upper surface and the recess of the fin 20.
- a hydraulic cylinder (extension actuator) 31A provided in parallel with the link member 32 is provided between the wall portion of 3A.
- the fin 20 When the hydraulic cylinder 31A is contracted, the fin 20 is stored in the recess 3A, and the lower surface of the fin 20 is located on the same plane as the bottom surface 3 in this storage position. That is, the fin 20 has the outer surface of the shape along the outer surface shape of the floating body 1 around the storage location where the recess 3A is formed.
- the hydraulic cylinder 31 ⁇ / b> A When the hydraulic cylinder 31 ⁇ / b> A is extended, the fin 20 protrudes from the recess 3 ⁇ / b> A and is set to a use position that protrudes outward from the side surface 4 slightly below the bottom surface 3.
- the hydraulic cylinder 31A is equipped with a lock mechanism that restricts expansion and contraction, and the fin 20 position is held by the lock mechanism in the storage position and the use position.
- the fluctuation reducing device 10A according to the first embodiment of the present invention is configured as described above, when the fluctuation reducing device 10A is used, as shown in FIG. 3B, the hydraulic cylinder 31A of the movable mechanism 32A is extended. Then, the fin 20 is set at a predetermined use position and fixed by the lock mechanism of the hydraulic cylinder 31A. Thereby, as described above, the motion reduction effect of the floating body 1 by the motion reduction device 10A can be obtained.
- the fin 20 in the use position protrudes toward the outside of the side surface 4, it interferes with the berthing.
- the fin 20 can be stored in the storage position in the recess 3 ⁇ / b> A, so Can be made.
- the fluctuation reducing device 10A is equipped only on the side surface 4 on one side of the floating body 1, the installation cost of the fluctuation reducing device 10A can be suppressed.
- the side surface 4 on both sides of the floating body 1 may be equipped with the sway reduction device 10A, respectively, so that any side surface 4 of the floating body 1 can be used toward the offshore side.
- the fluctuation reducing device 10B according to the second embodiment of the present invention is configured as described above, as in the first embodiment, as shown in FIG. 4B or FIG. By setting to a predetermined use position, it is possible to obtain the effect of reducing the fluctuation of the floating body 1.
- the movable mechanism 32A is operated to store any of the fins 20.
- the floating body 1 when towing the floating body 1 or bringing it into berth, as shown in FIG. 4A, the movable mechanism 32A is operated to store any of the fins 20.
- the floating body 1 when the floating body 1 is towed, the floating body 1 can be smoothly towed without causing deterioration in fuel consumption, and when the floating body 1 is berthed, the floating body 1 can be pierced without any trouble.
- the fluctuation reducing device 10B is different from the first and second embodiments in the shape of the fins 20B, and the storage location of the floating body 1 is different.
- the fin 20 ⁇ / b> B of the present embodiment has an inclined portion 22 extending obliquely downward from the vicinity of the corner portion 6 to the outside of the side surface 4 of the floating body 1, and the inclined portion 22. And a vertical portion 23 bent from the tip and extending vertically downward.
- the base end 21 is arranged with a gap 7 from the corner 6.
- the movable mechanism 32B includes a bending link member 33 swingably interposed between the fin 20 and the wall portion of the recess 3B formed in the corner 6 of the floating body 1, the fin 20 and the recess.
- a bending link member 33 and a hydraulic cylinder (extensible actuator) 31B provided in parallel with the wall portion 3b are provided.
- the hydraulic cylinder 31B when the hydraulic cylinder 31B is contracted, the fin 20 is stored in the recess 3B, and in this storage position, the outer surface of the inclined portion 22 and the vertical portion 23 of the fin 20 is aligned with the outer surface of the corner portion 6. Located on substantially the same plane.
- the hydraulic cylinder 31 ⁇ / b> B when the hydraulic cylinder 31 ⁇ / b> B is extended, the fin 20 protrudes from the recess 3 ⁇ / b> B and is set to a use position that protrudes outward from the side surface 4 slightly below the bottom surface 3.
- the hydraulic cylinder 31B is also equipped with a lock mechanism that restricts expansion and contraction, and the fin 20 position is held by the lock mechanism in the storage position and the use position.
- the upward surface 22a of the fin 20B at the use position (that is, the upward surface facing obliquely outward of the inclined portion 22) 22a collects the water flow that enters from the outside of the side surface 4 toward the side surface 4 due to the pushing waves of the waves. Function as a guide surface for guiding toward the gap 7.
- the size of the gap 7 is such that the water flow guided by the upward surface 22 a of the fin 20 and entering just below the bottom surface 3 from the gap 7 forms a high-speed laminar flow in the region near the corner 6 of the bottom surface 3. It is preferable to set it small.
- the downward surface of the fin 20B at the use position (that is, the downward surface facing obliquely inward of the inclined portion 22) 22b and the inward surface 23b of the vertical portion 23 are directed outward from the bottom surface 3 by the wave pulling waves. It functions as a resistance surface that prevents the water stream from advancing.
- the fluctuation reducing device 10B according to the third embodiment of the present invention is configured as described above, as in the first embodiment, as shown in FIG. 5A, the fluctuation reducing device 10B is placed at a predetermined use position. The effect of reducing the shaking of the floating body 1 by 10B can be obtained.
- the hydraulic cylinder 31B of the movable mechanism 32B is operated to store the fins 20 in the storage position in the recess 3B.
- the outer surface of the fin 20 ⁇ / b> B is positioned substantially on the same plane as the outer surface of the corner 6 of the floating body 1. That is, the fin 20 ⁇ / b> B has an outer surface having a shape along the outer surface shape of the floating body 1 around the storage location where the recess 3 ⁇ / b> B is formed. For this reason, when the floating body 1 is towed, the resistance by the fins 20 ⁇ / b> B is reduced, and the floating body 1 can be towed while smoothly suppressing deterioration of fuel consumption.
- the fin 20B in the use position protrudes toward the outside of the side surface 4, it interferes with the berthing, but the fin 20B can be stored in the storage position in the recess 3B when berthing, so that the floating body 1 can be pierced without trouble. Can be made.
- the fluctuation reducing device 10B is installed only on the side surface 4 on one side of the floating body 1.
- the fluctuation reducing device 10B is installed in the floating body 1. You may install in the side surfaces 4 and 4 of both sides.
- FIG. 6 is a cross-sectional view of a state in which the flat fin 20 according to the first and second embodiments is used while being tilted from the horizontal so that the outer side is slightly lowered, and the use of the fin 20B according to the third embodiment.
- the cross-sectional views in the state are shown in comparison.
- the fin 20B is more effective in reducing the fluctuation, but in the case of the fin 20, since the amount of outward projection of the fin 20 is reduced, there is an advantage that a mechanism for storage can be easily configured.
- the shape and arrangement of the fins 20B will be further described.
- the fin 20B has, in its use position, the inclined portion 22 that extends obliquely downward outside the side surface 4 of the floating body 1 from the vicinity of the corner portion 6, and the bent portion 20 that is bent from the tip of the inclined portion 22 and extends vertically downward. And a vertical portion 23.
- the water surface depth of the floating body 1 is d
- the vertical position of the base end 21 of the fin 20 with respect to the floating body 1 is a value with the downward direction being positive with reference to the bottom surface 3 of the floating body 1 s
- the horizontal position of the base end 21 of the fin 20 with respect to the floating body 1 is set to x0 with the center direction of the floating body 1 being positive with respect to the side surface 4 of the floating body 1
- the length of the inclined portion 22 is b
- the vertical of the inclined portion 22 is The inclination angle is ⁇
- the length of the vertical portion 23 is h.
- the fin is used with at least the base end being spaced from the corner of the floating body and protruding toward the outside of the side surface of the floating body.
- the upward surface of the fin is It functions as a guide surface that collects the water flow that tries to enter the side from the outside of the side and guides it toward the gap, and the downward surface of the fin is a water flow that tries to advance from the bottom to the outside due to wave pulling waves. Any material may be used as long as it functions as a resistance surface that prevents the above.
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Abstract
Description
特許文献2には、浮体の波の入射側側面に、波の進行方向上流側に向け傾斜し浮体の喫水線付近から下面深さ付近まで至らせた傾斜板を付設し、傾斜面による動揺低減を図ろうとする技術が記載されている。
特許文献4には、箱形浮体の長さと幅との比に対し、箱形浮体の幅と吃水との比の設定により、波力の影響を小さくして動揺低減を図ろうとする技術が記載されている。
なお、以下の説明では、鉛直上方を上又は上方とし、鉛直下方を下又は下方とし、浮体の側面において、浮体の幅方向中央の中心線に向く方向を内方又は内側とし、その反対側、中心線から離れる方向を外方又は外側として説明する。
まず、図1,図2(図2A~図2D)を参照して各実施形態にかかる動揺低減装置の概要を説明する。
図1は、各実施形態にかかる動揺低減装置を装備した浮体(浮体構造物)を示す斜視図である。図1に示すように、浮体1は、上面部(上面)2,下面部(下面)3,両側面部(側面)4,4,及び両端面部(端面)5,5を有する箱型(ほぼ直方体)に形成されている。ここでは、両側面部4,4に動揺低減装置10を装備した例を示している。
このため、隙間7の大きさは、フィン20の上向き面20aにより案内され隙間7から底面3の直下に進入した水流が、底面3の角部6の近傍領域で高速層流を形成するように小さく設定されていることが好ましい。
また、フィン20の下向き面20bは、波浪の引き波によって底面3から外方へ向けて進出する水流を阻止する抵抗面として機能する。
以下の各実施形態は、何れも、このように浮体1の動揺を低減するフィン20を有する動揺低減装置であるが、フィン20が、使用位置と浮体1に形成された凹所内に格納される格納位置との間で可動に構成されている点に特徴がある。
まず、本発明の第1実施形態にかかる動揺低減装置10Aを説明する。この動揺低減装置10Aは、図3A,図3Bに示すように、浮体1の片側の側面4にのみ装備されており、フィン20と、浮体1に結合されてフィン20を支持する支持部30Aとを有している。なお、浮体1は動揺低減装置10Aを装備される片側の側面4を波浪が進入してくる外洋向きに配置して係留されて使用される。
フィン20の上向き面20aは、波浪の押し波によって側面4の外方から側面4に向かって進入する水流を集めて隙間7に向けて案内する案内面として機能し、フィン20の下向き面20bは、波浪の引き波によって底面3から外方へ向けて進出する水流を阻止する抵抗面として機能する。
可動機構32Aは、フィン20の上面と、浮体1の底面3に形成された凹所3Aの壁部との間に揺動自在に介装されたリンク部材32と、フィン20の上面と凹所3Aの壁部との間にリンク部材32と並設された油圧シリンダ(伸縮アクチュエータ)31Aとを有している。
次に、本発明の第2実施形態を説明する。本実施形態では、図4A図4Cに示すように、第1実施形態と同様の動揺低減装置10Aが、浮体1の両側の側面4にそれぞれ装備されている。各側面4の動揺低減装置10Aは対称形状で同一構造なので、説明を省略する。
次に、本発明の第3実施形態にかかる動揺低減装置10Bを説明する。この動揺低減装置10Bは、第1,2実施形態とフィン20Bの形状が異なり、また、浮体1の格納箇所が異なっている。
ここで、フィンの形状及び配置について説明する。
図6は第1,2実施形態にかかる平板状のフィン20を、外側がやや下降するように水平よりも傾斜させて使用する状態における横断面図と、第3実施形態にかかるフィン20Bの使用状態における横断面図を比較して示している。
ここで、フィン20Bの形状及び配置についてさらに説明する。
前述のように、フィン20Bは、その使用位置において、角部6の近傍から浮体1の側面4の外側の斜め下方に延びた傾斜部22と、傾斜部22の先端から屈曲し鉛直下方に延びた鉛直部23とを有している。
これらのパラメータを種々変更して試験(シミュレーション)をした結果、動揺低減効果に優れたパラメータ値として以下の値が導出された。
以上、本発明の実施形態を説明したが、本発明は、その趣旨を逸脱しない範囲で、かかる実施形態を適宜変更したり、組み合わせたりして実施することができる。
例えば、上記の各実施形態では、フィン20,20Bの断面形状や配置を特定の形状に設定しているが、フィン20,20Bの断面形状や配置はこれに限るものではない。
2 上面部(上面)
3 下面部(下面)
4 側面部(側面)
5 端面部(端面)
10,10A,10B 動揺低減装置
20,20B フィン(板部)
21 フィン20,20Bの基端
22 傾斜部
22a 傾斜部22の上向き面(案内面)
22b 傾斜部22の下向き面(抵抗面)
23 鉛直部
23b 鉛直部23の内向き面(抵抗面)
30A,30B 支持部
31A,31B 油圧シリンダ(伸縮アクチュエータ)
32A,32B 可動機構
31,33 リンク部材
Claims (10)
- 浮体の側面と底面との角部に、基端を前記角部から隙間を開けて配置され、先端寄りを前記浮体の側面の外側に向けて突出させた状態で使用される板部と、
前記浮体に結合され前記板部を支持する支持部と、を有し、
前記板部の上向き面は、波浪の押し波によって前記側面の外方から前記側面に進入しようとする水流を集めて前記隙間に向けて案内する案内面として機能し、
前記板部の下向き面は、波浪の引き波によって前記底面から前記外方へ向けて進出しようとする水流を阻止する抵抗面として機能し、
前記支持部は、前記板部を、使用位置と、前記浮体の前記角部の近傍に形成された凹所に格納した格納位置との間で移動させる可動機構を有する
ことを特徴とする、動揺低減装置。 - 前記可動機構は、前記板部と前記凹所の壁部との間に揺動自在に介装されたリンク部材と、前記板部と前記凹所の壁部との間に前記リンク部材と並設された伸縮アクチュエータとを有する
ことを特徴とする、請求項1記載の動揺低減装置。 - 前記板部は、前記格納位置において、前記凹所の形成されている周囲の格納箇所の前記浮体の外面形状に沿う形状の外面を有している
ことを特徴とする、請求項1又は2記載の動揺低減装置。 - 前記板部は、平板状であって、前記使用位置において、水平に向いた状態で使用され、前記浮体の外面形状が平面状に形成された箇所に前記格納箇所が配置されている
ことを特徴とする、請求項1~3記載の動揺低減装置。 - 前記板部は、平板状であって、前記使用位置において、先端寄りを前記浮体の側面の外側及び下方に向けて傾斜させた状態で使用され、前記浮体の外面形状が平面状に形成された箇所に前記格納箇所が配置されている
ことを特徴とする、請求項1~3記載の動揺低減装置。 - 前記板部は、前記使用位置において、前記角部の近傍から前記浮体の側面の外側の斜め下方に延びた傾斜部と、前記傾斜部から屈曲し鉛直下方に延びた鉛直部とを有する屈曲形状に形成され、前記浮体の屈曲形状である前記角部に前記格納箇所が配置されている
ことを特徴とする、請求項1~3記載の動揺低減装置。 - 前記板部の基部と前記角部との前記隙間の大きさは、前記板部の上向き面により案内され前記隙間から前記底面に進入した水流が、前記底面の前記角部の近傍領域で高速層流を形成するように小さく設定されている
ことを特徴とする、請求項1~6の何れか1項に記載の動揺低減装置。 - 前記板部は、前記浮体の前記側面の全長に亘って設置されている
ことを特徴とする、請求項1~7の何れか1項に記載の動揺低減装置。 - 側面と底面との角部を有し、
前記角部の近傍に、請求項1~8の何れか1項に記載の動揺低減装置を装備されていることを特徴とする、浮体。 - 前記動揺低減装置が、前記浮体の両側の前記側面にそれぞれ設置されている
ことを特徴とする、請求項9記載の浮体。
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CN201580075966.4A CN107207079A (zh) | 2015-02-13 | 2015-09-16 | 摆动减弱装置和具备该装置的浮体 |
KR1020177022146A KR101965090B1 (ko) | 2015-02-13 | 2015-09-16 | 동요 저감 장치 및 이를 구비한 부체 |
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- 2015-09-16 CN CN201580075966.4A patent/CN107207079A/zh active Pending
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KR101965090B1 (ko) | 2019-08-07 |
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