JP6156906B2 - Floating body shaking suppression device and ginger - Google Patents
Floating body shaking suppression device and ginger Download PDFInfo
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- JP6156906B2 JP6156906B2 JP2013001230A JP2013001230A JP6156906B2 JP 6156906 B2 JP6156906 B2 JP 6156906B2 JP 2013001230 A JP2013001230 A JP 2013001230A JP 2013001230 A JP2013001230 A JP 2013001230A JP 6156906 B2 JP6156906 B2 JP 6156906B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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Description
本発明は、浮体動揺抑制装置および生簀に関する。さらに詳しくは、海上に設置される生簀等の浮体が波浪により動揺することを抑制するための浮体動揺抑制装置、および波浪による動揺を抑制できる生簀に関する。 The present invention relates to a floating body fluctuation suppressing device and a ginger. More specifically, the present invention relates to a floating body shaking suppression device for suppressing floating bodies such as ginger installed on the sea from being shaken by waves, and a ginger that can suppress shaking caused by waves.
水産資源生産力の向上のために、海上に設置された生簀に稚魚を投入し、所定の大きさまで育成した後、海域に放流することが行われている。しかし、大型船舶の航行や自然災害による異常波浪により、生簀が激しく動揺し、その動揺により稚魚が刺激されて死滅してしまうという問題がある。そこで、生簀の動揺を抑制する技術が求められている。 In order to improve the productivity of fishery resources, fry is introduced into ginger installed on the sea, grown to a predetermined size, and then released into the sea area. However, there is a problem that the ginger is shaken violently due to abnormal waves caused by navigation of large ships and natural disasters, and the fry is stimulated and killed by the shake. Therefore, there is a need for technology that suppresses the fluctuation of ginger.
生簀の動揺を抑制する技術として、特許文献１に記載の生簀がある。
特許文献１の生簀は、網が取り付けられる枠体の剛性を高め、かつ枠体の断面積の30〜70%を水中に沈下させたものである。枠体の剛性を高めることで、枠体が波の波形に追従して曲がるということがないので、この曲がりによる動揺を抑制することができる。また、枠体の断面積の30〜70%を水中に沈下させることにより、枠体が静水面の高さに浮くため、より動揺を抑制することができる。
As a technique for suppressing the fluctuation of ginger, there is a ginger described in Patent Document 1.
The ginger of Patent Document 1 is obtained by increasing the rigidity of a frame body to which a net is attached and submerging 30 to 70% of the cross-sectional area of the frame body in water. By increasing the rigidity of the frame body, the frame body does not bend following the waveform of the wave, so that it is possible to suppress the shaking caused by the bending. Moreover, since 30% to 70% of the cross-sectional area of the frame body is submerged in water, the frame body floats at the height of the static water surface, so that it is possible to further suppress shaking.
しかるに、特許文献１の生簀は、枠体の一辺の長さが波の波長よりも小さいと、枠体が波に乗った状態となり生簀が大きく動揺してしまうため、枠体の一辺の長さを波の波長よりも大きくする必要がある。そのため、生簀の寸法を自由に設定することができないという問題がある。 However, the ginger of Patent Document 1 has a length of one side of the frame because the ginger is greatly shaken when the length of one side of the frame is smaller than the wave wavelength. Needs to be larger than the wavelength of the wave. Therefore, there is a problem that the size of the ginger cannot be set freely.
本発明は上記事情に鑑み、浮体の波浪による動揺を抑制できる浮体動揺抑制装置、および波浪による動揺を抑制できる生簀を提供することを目的とする。 In view of the above circumstances, an object of the present invention is to provide a floating body vibration suppression device capable of suppressing the vibration of a floating body due to waves, and a ginger capable of suppressing the vibration due to waves.
第１発明の浮体動揺抑制装置は、水面に浮かせて設置される浮体に取り付けられる浮体動揺抑制装置であって、複数の水柱管を備え、それぞれの前記水柱管は、水中に開口する水側開口端を有し、水平方向に伸びる第１水平管と、前記第１水平管と接続し、下垂する第１垂直管と、前記第１垂直管と接続し、水平方向に伸びる第２水平管と、大気中に開口する大気側開口端を有し、下垂して前記第２水平管と接続する第２垂直管と、からなり前記複数の水柱管は、それぞれ前記水側開口端から前記大気側開口端までの長さが異なり、上下に積層するように設けられていることを特徴とする。
第２発明の浮体動揺抑制装置は、第１発明において、前記水側開口端の開口高さが、前記浮体が設置される水面の有義波高の90%以上であることを特徴とする。
第３発明の生簀は、第１または第２発明の浮体動揺抑制装置が取り付けられたことを特徴とする。
A floating body sway suppressing device according to a first aspect of the present invention is a floating body sway suppressing device attached to a floating body that floats on a water surface, and includes a plurality of water column pipes, and each of the water column pipes opens to a water side. A first horizontal pipe having an end and extending in a horizontal direction; a first vertical pipe connected to the first horizontal pipe; and a second horizontal pipe connected to the first vertical pipe and extending in the horizontal direction; Each of the plurality of water column pipes from the water side opening end to the atmosphere side, and has a second vertical pipe having an atmosphere side opening end opened to the atmosphere and hanging down to be connected to the second horizontal pipe. The length to the opening end is different, and it is provided so as to be stacked vertically .
The floating body fluctuation suppressing device of the second invention is characterized in that, in the first invention, the opening height of the water side opening end is 90% or more of the significant wave height of the water surface where the floating body is installed.
The ginger of the third invention is characterized in that the floating body fluctuation suppressing device of the first or second invention is attached.
第１発明によれば、水側開口端と大気側開口端とを有する水柱管を備えるので、水側開口端から侵入した波浪が水柱管の内部の水柱を振動させることにより、波浪エネルギーが水柱の振動エネルギーに変換される。さらに水柱の水面が振動することにより大気が振動し、水柱の振動エネルギーが大気の振動エネルギーに変換される。そのため、浮体に作用する波浪エネルギーが吸収され、浮体の波浪による動揺を抑制できる。また、水柱の振動の固有周期が異なる複数の水柱管を備えるので、不規則波の持つ広い周波数帯の波浪エネルギーを吸収することができる。そのため、不規則波に対して浮体の動揺を抑制できる。
第２発明によれば、水側開口端の開口高さが有義波高の90%以上であれば、水側開口端から波が進入しやすく、効率よく波浪エネルギーを吸収できる。
第３発明によれば、浮体動揺抑制装置が取り付けられているので生簀の波浪による動揺を抑制できる。そのため、生簀に投入される稚魚の刺激を低減でき、稚魚の死滅を防止し、水産資源生産力を向上できる。
According to the first aspect of the invention, the water column pipe having the water side opening end and the atmosphere side opening end is provided. Therefore, the wave energy that has entered from the water side opening end vibrates the water column inside the water column pipe, so that the wave energy can be Is converted into vibration energy. Furthermore, when the water surface of the water column vibrates, the atmosphere vibrates, and the vibration energy of the water column is converted into vibration energy of the air. Therefore, the wave energy acting on the floating body is absorbed, and the shaking caused by the wave of the floating body can be suppressed. Moreover, since a plurality of water column pipes having different natural periods of vibration of the water column are provided, it is possible to absorb wave energy in a wide frequency band that the irregular wave has. Therefore, the floating body can be prevented from shaking with respect to the irregular wave.
According to the second aspect of the invention, if the opening height of the water side opening end is 90% or more of the significant wave height, waves can easily enter from the water side opening end and can efficiently absorb the wave energy.
According to the third invention, since the floating body shaking suppression device is attached, the shaking caused by the ginger wave can be suppressed. Therefore, it is possible to reduce the stimulation of juvenile fish thrown into the ginger, prevent the killing of the juvenile fish, and improve the fishery resource productivity.
（原理）
まず、本発明の原理について説明する。
図１に示すように、一端が水中に開口する水側開口端１１であり、他端が大気中に開口する大気側開口端１２である水柱管１０は、その内部に水柱Ｃを有している。
この水柱Ｃの振動の固有周期Tは数１で得られ、水柱Ｃの長さLによって決定される。
First, the principle of the present invention will be described.
As shown in FIG. 1, a water column tube 10, one end of which is a water side opening end 11 which opens into water and the other end of which is an atmosphere side opening end 12 which opens into the atmosphere, has a water column C therein. Yes.
The natural period T of the vibration of the water column C is obtained by Equation 1, and is determined by the length L of the water column C.
水柱管１０の内部に水側開口端１１から波が侵入すると、水柱Ｃを振動させ、波の波浪エネルギーが水柱Ｃの振動エネルギーに変換される。さらに水柱Ｃの水面Ｓが振動することにより大気が振動し、水柱Ｃの振動エネルギーが大気の振動エネルギーに変換される。そのため、波の波浪エネルギーが吸収され、波による動揺を抑制できる。 When a wave enters the water column pipe 10 from the water side opening end 11, the water column C is vibrated, and wave energy of the wave is converted into vibration energy of the water column C. Furthermore, when the water surface S of the water column C vibrates, the atmosphere vibrates, and the vibration energy of the water column C is converted into vibration energy of the air. Therefore, the wave energy is absorbed, and the shaking caused by the waves can be suppressed.
特に、侵入する波の周期T'が、水柱Ｃの振動の固有周期Tと同一である場合、水柱Ｃが激しく振動し、波浪エネルギーを大きく吸収することができる。そのため、波浪エネルギーの吸収効率が高くなり、波による動揺をより抑制できる。 In particular, when the period T ′ of the invading wave is the same as the natural period T of the vibration of the water column C, the water column C vibrates violently and can greatly absorb the wave energy. Therefore, the absorption efficiency of wave energy becomes high, and the fluctuation caused by the waves can be further suppressed.
逆に考えれば、水柱Ｃの振動の固有周期Tが波の周期T'と略同一になるように、水柱Ｃの長さLを決定すれば、波の波浪エネルギーを効率よく吸収でき、波による動揺を抑制できる。ここで、水柱Ｃの長さLは、水柱管１０の水中に沈下した部分の長さであるので、水柱管１０の長さを調整することにより、所望の周期の波の波浪エネルギーを吸収することができる。 Conversely, if the length L of the water column C is determined so that the natural period T of the vibration of the water column C is substantially the same as the wave period T ′, the wave energy can be absorbed efficiently, Swaying can be suppressed. Here, since the length L of the water column C is the length of the submerged portion of the water column tube 10, the wave energy of waves having a desired period is absorbed by adjusting the length of the water column tube 10. be able to.
（第１実施形態）
つぎに、本発明の実施形態を図面に基づき説明する。
図２、図３および図４に示すように、本発明の第１実施形態に係る浮体動揺抑制装置Ａは、一端が水中に開口する水側開口端１１であり、他端が大気中に開口する大気側開口端１２である水柱管１０を備えている。
(First embodiment)
Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 2, 3, and 4, the floating body sway suppression device A according to the first embodiment of the present invention is a water-side opening end 11 having one end opened in water, and the other end opened in the atmosphere. The water column pipe 10 which is the atmosphere side opening end 12 is provided.
水柱管１０は、水平方向に伸びる第１水平管１３と、その第１水平管１３と接続し下垂する第１垂直管１４と、その第１垂直管１４と接続し水平方向に伸びる第２水平管１５と、その第２水平管１５と接続し立設する第２垂直管１６とからなる、側面視略Ｊ字形の管である。また、水側開口端１１および大気側開口端１２は、同じ幅寸法を有する横長の長方形であり、水柱管１０は全長に渡って断面が長方形の管である。
このように、水柱管１０は、多数の平面から構成されており、板材を屈曲、接合して形成することができるので、製造が容易である。
The water column pipe 10 includes a first horizontal pipe 13 extending in the horizontal direction, a first vertical pipe 14 connected to the first horizontal pipe 13 and hanging down, and a second horizontal pipe connected to the first vertical pipe 14 and extending in the horizontal direction. The tube 15 and a second vertical tube 16 connected to and standing up with the second horizontal tube 15 are substantially J-shaped tubes in a side view. The water-side opening end 11 and the atmosphere-side opening end 12 are horizontally long rectangles having the same width dimension, and the water column tube 10 is a tube having a rectangular cross section over the entire length.
Thus, the water column pipe 10 is composed of a large number of flat surfaces, and can be formed by bending and joining the plate materials, so that the manufacture is easy.
また、図３，図４および図５に示すように、水側開口端１１および大気側開口端１２には、その長辺同士に掛け渡されたリブ１７が設けられている。このリブ１７により水側開口端１１および大気側開口端１２の強度が高められている。
なお、本実施形態においては、リブ１７は水側開口端１１および大気側開口端１２にのみ設けられているが、水柱管１０の内部にも設けてより強度を高めてもよい。また、十分な強度が得られれば、水側開口端１１および大気側開口端１２にリブ１７を設けなくてもよい。
As shown in FIGS. 3, 4, and 5, the water-side opening end 11 and the atmosphere-side opening end 12 are provided with ribs 17 that span the long sides. The ribs 17 enhance the strength of the water side opening end 11 and the atmosphere side opening end 12.
In the present embodiment, the ribs 17 are provided only at the water-side opening end 11 and the atmosphere-side opening end 12, but the ribs 17 may also be provided inside the water column pipe 10 to further increase the strength. Moreover, if sufficient intensity | strength is obtained, it is not necessary to provide the rib 17 in the water side opening end 11 and the atmosphere side opening end 12. FIG.
上記の浮体動揺抑制装置Ａは、海上に浮かせて設置される生簀等の浮体に取り付けられ、その浮体が波浪により動揺することを抑制する。以下、浮体動揺抑制装置Ａを生簀Ｐに取り付ける場合について説明する。 The floating body shaking suppression device A is attached to a floating body such as a ginger that is floated on the sea and suppresses the floating body from being shaken by waves. Hereinafter, the case where the floating body fluctuation suppression apparatus A is attached to the ginger P will be described.
図６および図７に示すように、浮体動揺抑制装置Ａを生簀Ｐに取り付ける場合には、水柱管１０の第１垂直管１４、第２水平管１５および第２垂直管１６で形成される凹部に、生簀Ｐの枠体５１とその下面に設けられた浮き５２が嵌め込まれる。また、浮体動揺抑制装置Ａを取り付けた場合に、生簀Ｐの浮き５２だけでは浮力が足りない場合には、水柱管１０の周囲にも浮き４０を設け、浮体動揺抑制装置Ａおよび生簀Ｐの枠体５１が海面上に浮くようにする。 As shown in FIG. 6 and FIG. 7, when the floating body fluctuation suppressing device A is attached to the ginger P, the recess formed by the first vertical pipe 14, the second horizontal pipe 15, and the second vertical pipe 16 of the water column pipe 10. In addition, a frame 51 of the ginger P and a float 52 provided on the lower surface thereof are fitted. In addition, when the floating body shaking suppression device A is attached and the buoyancy is not sufficient only by the floating 52 of the ginger P, the floating body 40 is also provided around the water column pipe 10, and the floating body shaking suppressing device A and the frame of the ginger P are provided. The body 51 is made to float on the sea surface.
以上のように、浮体動揺抑制装置Ａは生簀Ｐに取り付けやすい構造となっている。また、生簀Ｐの枠体５１は給餌等の作業をする場所であるが、浮体動揺抑制装置Ａによって枠体５１を狭くすることがないので、浮体動揺抑制装置Ａが作業の邪魔にならない。 As described above, the floating body fluctuation suppressing device A has a structure that can be easily attached to the ginger P. Moreover, although the frame 51 of the ginger P is a place where work such as feeding is performed, since the frame 51 is not narrowed by the floating body vibration suppression device A, the floating body vibration suppression device A does not interfere with the work.
図５に示すように、浮体動揺抑制装置Ａは、水側開口端１１が水中に開口し、大気側開口端１２が大気中に開口するように生簀Ｐに取り付けられる。そして、水柱管１０の内部に海水が侵入し、第２垂直管１６の内部に水面Ｓを有する水柱Ｃが形成される。 As shown in FIG. 5, the floating body fluctuation suppressing device A is attached to the ginger P so that the water-side opening end 11 opens into the water and the atmosphere-side opening end 12 opens into the atmosphere. Then, seawater enters the water column pipe 10, and a water column C having a water surface S is formed inside the second vertical pipe 16.
浮体動揺抑制装置Ａが取り付けられた生簀Ｐに対して波浪が迫ると、その波浪の一部が水側開口端１１から侵入し、水柱管１０の内部の水柱Ｃを振動させることにより、波浪エネルギーが水柱Ｃの振動エネルギーに変換される。さらに水柱Ｃの水面Ｓが振動することにより大気が振動し、水柱Ｃの振動エネルギーが大気の振動エネルギーに変換される。そのため、生簀Ｐに作用する波浪エネルギーが吸収され、生簀Ｐの波浪による動揺を抑制できる。これにより、生簀Ｐに投入される稚魚の刺激を低減でき、稚魚の死滅を防止し、水産資源生産力を向上できる。 When a wave approaches the ginger P to which the floating body vibration suppression device A is attached, a part of the wave enters from the water-side opening end 11 and vibrates the water column C inside the water column tube 10, thereby generating wave energy. Is converted into vibration energy of the water column C. Furthermore, when the water surface S of the water column C vibrates, the atmosphere vibrates, and the vibration energy of the water column C is converted into vibration energy of the air. Therefore, the wave energy which acts on the ginger P is absorbed, and the shaking caused by the wave of the ginger P can be suppressed. Thereby, the irritation | stimulation of the fry thrown into the ginger P can be reduced, the death of a fry can be prevented, and fishery resource productivity can be improved.
また、浮体動揺抑制装置Ａにより水面付近の流れが制御され、水中に存在する付着物質が拡散されるので、生簀Ｐへの藻などの付着物を低減できる。 Moreover, since the floating body fluctuation suppression apparatus A controls the flow near the water surface and the adhering substances existing in the water are diffused, the adhering substances such as algae on the ginger P can be reduced.
前述の通り、水柱Ｃの長さLは、水側開口端１１から水面Ｓまでの長さであり、この長さLにより水柱Ｃの振動の固有周期Tが決定される。
水柱管１０は、内部の水柱Ｃの振動の固有周期Tが、生簀Ｐが設置される海面の有義波周期T1/3と略同一となるように構成することが好ましい。より詳細には、水柱Ｃの振動の固有周期Tが有義波周期T1/3と略同一となるように水柱Ｃの長さLを決定し、その長さLの水柱Ｃが得られるように水柱管１０の長さを決定することが好ましい。
As described above, the length L of the water column C is the length from the water side opening end 11 to the water surface S, and the natural period T of the vibration of the water column C is determined by this length L.
The water column tube 10 is preferably configured such that the natural period T of the vibration of the internal water column C is substantially the same as the significant wave period T 1/3 of the sea surface where the ginger P is installed. More specifically, the length L of the water column C is determined so that the natural period T of the vibration of the water column C is substantially the same as the significant wave period T 1/3, and the water column C having the length L is obtained. It is preferable to determine the length of the water column pipe 10.
水柱Ｃの振動の固有周期Tを有義波周期T1/3と略同一とすれば、有義波によって水柱Ｃが激しく振動し、波浪エネルギーを大きく吸収することができる。
海上の波浪は不規則波であり広い周波数帯を有するが、有義波の波浪エネルギーを効率よく吸収することで、広い周波数帯を有する波浪エネルギーの吸収効率が全体として高くなる。
If the natural period T of the vibration of the water column C is substantially the same as the significant wave period T 1/3 , the water column C vibrates violently due to the significant wave, and the wave energy can be greatly absorbed.
Waves on the sea are irregular waves and have a wide frequency band, but by absorbing the wave energy of significant waves efficiently, the absorption efficiency of wave energy having a wide frequency band as a whole becomes high.
なお、水柱管１０は側面視J字形に屈曲しているので、水柱Ｃの振動の固有周期Tを所望の周期に設定するために水柱管１０の長さを確保しつつ、浮体動揺抑制装置Ａを小型化することができる。 Since the water column pipe 10 is bent in a J-shape when viewed from the side, the floating body vibration suppression device A is secured while securing the length of the water column pipe 10 in order to set the natural period T of the vibration of the water column C to a desired period. Can be miniaturized.
また、水側開口端１１の開口高さｈは、生簀Ｐが設置される海面の有義波高H1/3の90%以上とすることが好ましい。
水側開口端１１の開口高さｈが有義波高H1/3の90%以上であれば、水側開口端１１から波が進入しやすく、効率よく波浪エネルギーを吸収できるからである。
The opening height h of the water-side opening end 11 is preferably 90% or more of the significant wave height H 1/3 of the sea surface where the ginger P is installed.
This is because if the opening height h of the water-side opening end 11 is 90% or more of the significant wave height H 1/3 , waves easily enter from the water-side opening end 11 and can efficiently absorb wave energy.
また、水側開口端１１の上下位置は、波高の中間である静水面に対して、水側開口端１１の半分以上が水没していればよい。水側開口端１１の半分以上が水没していれば、水柱Ｃが確保され、波浪エネルギーを吸収できるからである。
このように、特許請求の範囲に記載の「水中に開口する水側開口端」とは、水側開口端の一部が水没している状態も含む概念である。
Moreover, the vertical position of the water side opening end 11 should just submerge half or more of the water side opening end 11 with respect to the still water surface which is the middle of a wave height. This is because if more than half of the water-side opening end 11 is submerged, the water column C is secured and the wave energy can be absorbed.
Thus, “a water-side opening end that opens in water” described in the claims is a concept including a state in which a part of the water-side opening end is submerged.
また、生簀Ｐに取り付ける浮体動揺抑制装置Ａの数や位置は任意に定めることができる。例えば、図６における枠体５１の上下位置にも浮体動揺抑制装置Ａを取り付けてもよい。また、円形の生簀の場合には、その周囲を囲むように浮体動揺抑制装置Ａを円形に配置してもよい。
ただし、浮体動揺抑制装置Ａは、その水側開口端１１を波の来る方向に向かって設けることが好ましい。このように設ければ、生簀Ｐに迫る波浪の波浪エネルギーを効率よく吸収することができるからである。
Moreover, the number and position of the floating body fluctuation suppression apparatus A attached to the ginger P can be arbitrarily determined. For example, you may attach the floating body fluctuation suppression apparatus A also to the up-down position of the frame 51 in FIG. Further, in the case of a circular ginger, the floating body fluctuation suppressing device A may be arranged in a circle so as to surround the periphery.
However, it is preferable that the floating body shaking suppression device A is provided with the water side opening end 11 in the direction in which the waves come. This is because the wave energy of the waves approaching the ginger P can be efficiently absorbed.
（第２実施形態）
つぎに、本発明の第２実施形態に係る浮体動揺抑制装置Ｂについて説明する。
図８に示すように、浮体動揺抑制装置Ｂは、長さの異なる３つの水柱管１０、２０、３０を備えている。それぞれの水柱管１０、２０、３０の内部に有する水柱Ｃ1、Ｃ2、Ｃ3は、その長さL1、L2、L3が異なっており、それゆえ固有周期T1、T2、T3が異なっている。
(Second Embodiment)
Next, a floating body fluctuation suppressing device B according to a second embodiment of the present invention will be described.
As shown in FIG. 8, the floating body fluctuation suppressing device B includes three water column pipes 10, 20, and 30 having different lengths. The water columns C 1 , C 2 , C 3 in the respective water column pipes 10, 20, 30 have different lengths L 1 , L 2 , L 3 , and therefore the natural periods T 1 , T 2 , T 3 is different.
海等の波は不規則波であり広い周波数帯を有する。浮体動揺抑制装置Ｂは、内部の水柱Ｃ1、Ｃ2、Ｃ3の振動の固有周期T1、T2、T3が異なる複数の水柱管１０、２０、３０を備えるので、広い周波数帯の波浪エネルギーを吸収することができる。これにより、不規則波に対しても生簀Ｐの動揺を抑制できる。 Waves such as the sea are irregular waves and have a wide frequency band. Since the floating body vibration suppression device B includes a plurality of water column pipes 10, 20, and 30 having different natural periods T 1 , T 2 , and T 3 of vibrations of the internal water columns C 1 , C 2 , and C 3 , Wave energy can be absorbed. Thereby, the fluctuation of the ginger P can be suppressed even for an irregular wave.
なお、本実施形態では、３つの水柱管１０、２０、３０の水側開口端１１、２１、３１を面一に設けたが、互いに段差を設けてもよい。また、本実施形態では、３つの水柱管１０、２０、３０を上下に積層するように設けたが、各水柱管１０、２０、３０の間に隙間が設けられるように構成してもよい。また、３つの水柱管１０、２０、３０を浮体動揺抑制装置Ｂの幅方向に連接して設けてもよい。以上のように構成すれば、各水柱管１０、２０、３０の長さを自在に設定することができるので、所望の３つの固有周期T1、T2、T3の水柱Ｃ1、Ｃ2、Ｃ3を有する浮体動揺抑制装置Ｂを得ることができる。 In the present embodiment, the water-side opening ends 11, 21, and 31 of the three water column pipes 10, 20, and 30 are provided flush with each other, but steps may be provided. In the present embodiment, the three water column pipes 10, 20, 30 are provided so as to be stacked one above the other. However, a gap may be provided between the water column pipes 10, 20, 30. Further, the three water column tubes 10, 20, 30 may be provided in the width direction of the floating body fluctuation suppressing device B. By configuring as described above, since the length of each water column tubes 10, 20 and 30 can be set freely, water column C 1 of a desired three natural period T 1, T 2, T 3 , C 2 , C 3 can be obtained.
（他の実施形態）
上記実施形態では、水柱管１０を側面視略Ｊ字形としたが、側面視Ｌ字形等種々の形状に構成することができる。また、水柱管１０は、角を有するように屈曲させる以外に、なめらかに湾曲させてもよい。さらに、水柱管１０の断面は長方形に限らず、円形等種々の形状を採用することができる。このように、所望の固有周期Tを有する水柱Ｃを得られれば、水柱管１０の形状は特に限定されない。
(Other embodiments)
In the said embodiment, although the water column pipe 10 was made into substantially J shape in the side view, it can be comprised in various shapes, such as L shape in the side view. Further, the water column tube 10 may be smoothly curved in addition to being bent so as to have a corner. Furthermore, the cross section of the water column tube 10 is not limited to a rectangle, and various shapes such as a circle can be adopted. Thus, if the water column C which has the desired natural period T is obtained, the shape of the water column pipe 10 will not be specifically limited.
また、水側開口端１１の開口向きは、波が入ることのできる方向であれば、特に限定されない。ただし、水側開口端１１の近傍の水柱管１０（第１実施形態においては第１水平管１３）は、水平に設けた方が好ましい。このように構成することで、波が水側開口端１１に侵入しやすく、波浪エネルギーの吸収効率が高くなるからである。 Moreover, the opening direction of the water side opening end 11 will not be specifically limited if it is a direction in which a wave can enter. However, it is preferable that the water column pipe 10 (the first horizontal pipe 13 in the first embodiment) in the vicinity of the water side opening end 11 is provided horizontally. This is because the wave easily enters the water-side opening end 11 and the wave energy absorption efficiency is increased.
上記実施形態では、浮体動揺抑制装置を生簀Ｐに取り付けたが、生簀Ｐ以外にも、水面に浮かせて設置される種々の浮体に取り付けられる。例えば、浮桟橋や、停泊中の船舶、等に浮体動揺抑制装置が取り付けられる。 In the above embodiment, the floating body fluctuation suppressing device is attached to the ginger P. However, in addition to the ginger P, it is attached to various floating bodies that are installed floating on the water surface. For example, a floating body shaking suppression device is attached to a floating pier or a ship that is anchored.
つぎに、実施例により、その効果を説明する。
（水理模型実験）
まず、水理模型実験について説明する。
浮体動揺抑制装置の模型を用いて水理実験を行い、浮体動揺抑制装置の規則波中におけるエネルギー吸収特性の評価を行った。実験は、浮体動揺抑制装置の模型を生簀に取り付け、これに所定の周期の波を入射させて行った。入射波の振幅と、生簀の振幅を測定し、その測定結果から入射波のエネルギーEと浮体動揺抑制装置による吸収エネルギーPを算出した。そして、入射波のエネルギーEと吸収エネルギーPとからエネルギー吸収効率P/Eを算出した。また、エネルギー吸収効率の測定結果と理論計算との比較を行い、エネルギー吸収特性の評価を行った。
Next, the effect will be described with reference to examples.
(Hydraulic model experiment)
First, a hydraulic model experiment will be described.
A hydraulic experiment was conducted using a model of the floating body vibration suppression device, and the energy absorption characteristics of the floating body vibration suppression device in regular waves were evaluated. The experiment was carried out by attaching a model of a floating body sway suppressor to a ginger and injecting a wave of a predetermined period into the model. The amplitude of the incident wave and the amplitude of the ginger were measured, and the energy E of the incident wave and the absorbed energy P by the floating body vibration suppression device were calculated from the measurement results. Then, the energy absorption efficiency P / E was calculated from the energy E and the absorption energy P of the incident wave. In addition, the energy absorption efficiency was evaluated by comparing the measurement results of energy absorption efficiency with theoretical calculations.
（実施例１）
上記第１実施形態に係る浮体動揺抑制装置Ａの構成を有する1/25スケールの浮体動揺抑制装置の模型を用いて水理実験を行った。この模型の水柱の長さLは38cmであり、振動の固有周期Tは1.24秒である。
図９に示すように、測定結果によれば、入射波の周期が1.0秒である場合に、エネルギー吸収効率が0.30であった。また、論理計算から、入射波の周期が1.24秒の場合の、エネルギー吸収効率は0.43であった。なお、測定結果と理論計算とがよく一致しているため、水理実験においても入射波の周期を固有周期Tと同じ1.24秒とした場合、エネルギー吸収効率が0.43程度となることが予測される。
Example 1
A hydraulic experiment was performed using a model of a 1/25 scale floating body vibration suppression device having the configuration of the floating body vibration suppression device A according to the first embodiment. The length L of the water column of this model is 38 cm, and the natural period T of vibration is 1.24 seconds.
As shown in FIG. 9, according to the measurement result, the energy absorption efficiency was 0.30 when the period of the incident wave was 1.0 second. From the logical calculation, the energy absorption efficiency was 0.43 when the incident wave period was 1.24 seconds. In addition, since the measurement results and the theoretical calculations are in good agreement, the energy absorption efficiency is expected to be about 0.43 when the period of the incident wave is 1.24 seconds, which is the same as the natural period T, in the hydraulic experiment. .
（実施例２）
つぎに、第１実施形態に係る浮体動揺抑制装置Ａの構成を有する1/15スケールの浮体動揺抑制装置の模型を用いて水理実験を行った。この模型の水柱の長さLは60cmであり、振動の固有周期Tは1.55秒である。
図１０に示すように、測定結果によれば、入射波の周期が1.5秒である場合に、エネルギー吸収効率が0.93となり、入射波の波浪エネルギーのほぼ全てを吸収できることがわかる。また、測定結果と理論計算とがよく一致した。
(Example 2)
Next, a hydraulic experiment was performed using a model of a 1/15 scale floating body vibration suppression device having the configuration of the floating body vibration suppression device A according to the first embodiment. The length L of the water column of this model is 60 cm, and the natural period T of vibration is 1.55 seconds.
As shown in FIG. 10, according to the measurement result, it can be seen that when the period of the incident wave is 1.5 seconds, the energy absorption efficiency is 0.93, and almost all the wave energy of the incident wave can be absorbed. Moreover, the measurement result and the theoretical calculation agreed well.
（稚魚育成実験）
つぎに、稚魚育成実験について説明する。
タケノコメバルの稚魚を５０個体投入した生簀を２セット用意し、一方の生簀に第１実施形態に係る浮体動揺抑制装置Ａの構成を有する1/15スケールの浮体動揺抑制装置の模型を取り付けた。この２セットの生簀を用いて水理実験を行った。生簀への入射波の周期は、上記水理模型実験によって得られた図１０のグラフから、エネルギー吸収効率が0.7となる1.3秒に設定した。浮体動揺抑制装置を取り付けた生簀を実験区、浮体動揺抑制装置を取り付けていない生簀を対照区とし、それぞれ生簀に投入する前の稚魚の体重および体長を測定し、１５日後の稚魚の体重および体長を再度測定して肥満度減少率を算出した。算出した肥満度減少率を比較して、浮体動揺抑制装置の動揺抑制の有効性の評価を行った。
(Fry rearing experiment)
Next, fry breeding experiments will be described.
Two sets of ginger in which 50 shoots of bamboo shoots were introduced were prepared, and a model of a 1/15 scale floating body shaking restraint device having the structure of the floating body shaking restraint device A according to the first embodiment was attached to one ginger. A hydraulic experiment was conducted using these two sets of ginger. The period of the incident wave on the ginger was set to 1.3 seconds at which the energy absorption efficiency was 0.7 from the graph of FIG. 10 obtained by the hydraulic model experiment. Measure the weight and length of the fry before putting them into the ginger, and measure the weight and length of the fry after 15 days. Was measured again to calculate the obesity reduction rate. The calculated rate of obesity reduction was compared to evaluate the effectiveness of the floating body swing suppression device.
実験の結果、表１が得られた。
表１より、実験区の肥満度減少率は(1-30.2/31.6)×100=4.43%であり、対照区の肥満度減少率は(1-30.9/34.2)×100=9.65%であることがわかる。
実験区の肥満度減少率が対照区の肥満度減少率より低いことから、浮体動揺抑制装置を取り付けることにより、生簀の動揺を抑制でき、稚魚の刺激を低減できることがわかった。
From Table 1, the obesity reduction rate in the experimental group is (1-30.2 / 31.6) x 100 = 4.43%, and the obesity reduction rate in the control group is (1-30.9 / 34.2) x 100 = 9.65% I understand.
Since the rate of obesity reduction in the experimental group was lower than the rate of obesity reduction in the control group, it was found that by attaching a floating body shaking suppression device, the shaking of the ginger can be suppressed and the stimulation of fry can be reduced.
（実海域模型実験）
つぎに、実海域模型実験について説明する。
浮体動揺抑制装置の不規則波中におけるエネルギー吸収特性の評価を行うため、第１実施形態に係る浮体動揺抑制装置Ａの構成を有する1/15スケールの浮体動揺抑制装置の模型を取り付けた生簀を実海域に設置した。生簀に入射する入射波の波高を観測し、入射波の有義波周期T1/3と有義波高H1/3を算出した。また、生簀内の波の波高を観測し、生簀内の波の有義波周期T'1/3と有義波高H'1/3を算出した。算出した有義波周期T1/3、T'1/3と有義波高H1/3、H'1/3とから、入射波および生簀内の波のエネルギースペクトルを算出した。そのエネルギースペクトルを比較して、実海域における浮体動揺抑制装置のエネルギー吸収特性を評価した。
(Real sea area model experiment)
Next, the actual sea area model experiment will be described.
In order to evaluate the energy absorption characteristics of the floating body vibration suppression device in irregular waves, a ginger fitted with a 1/15 scale floating body vibration suppression device model having the structure of the floating body vibration suppression device A according to the first embodiment is used. Installed in the actual sea area. The wave height of the incident wave incident on the ginger was observed, and the significant wave period T 1/3 and the significant wave height H 1/3 of the incident wave were calculated. In addition, the wave height in the ginger was observed, and the significant wave period T ' 1/3 and the significant wave height H' 1/3 of the wave in the ginger were calculated. From the calculated significant wave periods T 1/3 and T ′ 1/3 and the significant wave heights H 1/3 and H ′ 1/3 , the energy spectrum of the incident wave and the wave in the ginger was calculated. By comparing the energy spectra, the energy absorption characteristics of the floating body vibration suppression device in the actual sea area were evaluated.
実験の結果、入射波および生簀内の波の有義波周期および有義波高は表２に示すとおりとなった。
表２の結果より、入射波および生簀内の波のエネルギースペクトルは、図１１に示すようになる。
また、入射波のエネルギーEirrは0.253m2、生簀内の波のエネルギーPは0.071m2と算出される。
From the results of Table 2, the energy spectrum of the incident wave and the wave in the ginger is as shown in FIG.
The energy E irr the incident wave 0.253M 2, energy P wave in cages is calculated as 0.071m 2.
エネルギー吸収効率ηは、以下の数２で与えられる。
稚魚の成育に支障のない動揺範囲となることが既往のデータから示されており、浮体動揺抑制装置の動揺抑制の有効性が確認された。
The energy absorption efficiency η is given by the following formula 2.
It has been shown from the existing data that the range of swaying does not hinder the growth of fry, and the effectiveness of sway suppression by the floating body sway suppressor was confirmed.
Ａ 浮体動揺抑制装置
Ｃ 水柱
１０ 水柱管
１１ 水側開口端
１２ 大気側開口端
１３ 第１水平管
１４ 第１垂直管
１５ 第２水平管
１６ 第２垂直管
１７ リブ
Ｐ 生簀
A Floating body fluctuation suppression device C Water column 10 Water column tube 11 Water side opening end 12 Atmosphere side opening end 13 First horizontal tube 14 First vertical tube 15 Second horizontal tube 16 Second vertical tube 17 Rib P Ginger
Claims (3)
複数の水柱管を備え、
それぞれの前記水柱管は、
水中に開口する水側開口端を有し、水平方向に伸びる第１水平管と、
前記第１水平管と接続し、下垂する第１垂直管と、
前記第１垂直管と接続し、水平方向に伸びる第２水平管と、
大気中に開口する大気側開口端を有し、下垂して前記第２水平管と接続する第２垂直管と、からなり
前記複数の水柱管は、それぞれ前記水側開口端から前記大気側開口端までの長さが異なり、上下に積層するように設けられている
ことを特徴とする浮体動揺抑制装置。 A floating body vibration suppression device attached to a floating body that is installed floating on the water surface,
With multiple water column pipes ,
Each said water column pipe is
A first horizontal pipe having a water side opening end that opens into water and extending in a horizontal direction;
A first vertical pipe connected to and hanging from the first horizontal pipe;
A second horizontal pipe connected to the first vertical pipe and extending in a horizontal direction;
A second vertical pipe having an open end on the atmosphere side that opens into the atmosphere and connected to the second horizontal pipe by dropping down.
The floating body sway suppressing device, wherein the plurality of water column pipes have different lengths from the water side opening end to the atmosphere side opening end, and are stacked vertically .
ことを特徴とする請求項１記載の浮体動揺抑制装置。 The opening height of the water side open end, floating fluctuation suppression device according to claim 1, wherein the floating body is 90% or more of the significant wave height of the water surface to be installed.
ことを特徴とする生簀。 A ginger, to which the floating body fluctuation suppressing device according to claim 1 or 2 is attached.
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| JP2013001230A JP6156906B2 (en) | 2013-01-08 | 2013-01-08 | Floating body shaking suppression device and ginger |
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| JPS60142197A (en) * | 1983-12-29 | 1985-07-27 | Ntn Toyo Bearing Co Ltd | Heat exchanger |
| JPS62194312A (en) * | 1986-02-20 | 1987-08-26 | Hitachi Zosen Corp | floating wave bank |
| JP3393232B2 (en) * | 1996-10-23 | 2003-04-07 | 独立行政法人水産総合研究センター | Floating breakwater |
| JPH112284A (en) * | 1997-06-13 | 1999-01-06 | Ishikawajima Harima Heavy Ind Co Ltd | Rocking device |
| JP2000135999A (en) * | 1998-10-30 | 2000-05-16 | Mitsubishi Heavy Ind Ltd | Wave resistance large floating body |
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