JP4625888B2 - Marine bilge keel - Google Patents

Marine bilge keel Download PDF

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JP4625888B2
JP4625888B2 JP2006065597A JP2006065597A JP4625888B2 JP 4625888 B2 JP4625888 B2 JP 4625888B2 JP 2006065597 A JP2006065597 A JP 2006065597A JP 2006065597 A JP2006065597 A JP 2006065597A JP 4625888 B2 JP4625888 B2 JP 4625888B2
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bilge keel
bilge
keel
hull
ship
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JP2007238007A (en
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敏彦 川島
政治 佐藤
和睦 鬼追
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Yanmar Co Ltd
Fisheries Research Agency
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Fisheries Research Agency
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Description

本発明は、船舶の左右舷それぞれに長手方向に設けられるビルジキールの形状に関する。   The present invention relates to the shape of a bilge keel provided in the longitudinal direction on each of the left and right anchors of a ship.

波浪中を航走する船舶は、波浪の作用により動揺する。特に、動揺のうち横揺(以下、ローリングと表現する)は、船上での快適性や作業性を損ね、とりわけ過大なローリングは、船舶の転覆を誘発する場合もある。したがって、ローリング防止は、船舶にとって重要な課題であった。従来、ローリング防止の一技術として、ビルジキールと称されるローリング防止用の板が、船体横の底部に取り付けられてきた。特許文献1は、小型船舶のビルジキールの一例を開示している。
特許第3320801号公報
A ship sailing in the waves is shaken by the action of the waves. In particular, rolling (hereinafter referred to as rolling) among the shakings impairs comfort and workability on the ship, and particularly excessive rolling may induce the capsizing of the ship. Therefore, prevention of rolling has been an important issue for ships. Conventionally, as one technique for preventing rolling, a rolling preventing plate called a bilge keel has been attached to the bottom of the hull. Patent Document 1 discloses an example of a bilge keel of a small ship.
Japanese Patent No. 3320801

一般的に、ビルジキールは、船舶の左右舷に長手方向に2枚の細板が溶接等により固設される。すなわち、船舶のローリングに伴うビルジキール渦の効果(造渦減衰)により、ローリングの減少を図ることができる。ビルジキールのサイズは船舶により異なるが、例えば、遠洋マグロ延縄漁船では、長さは船長さの1/3から1/2、幅は0.5m程度に到る。特に、中小型船舶である漁船は、船体規模が小さいため波浪の影響を受けやすく、荒天下の航海・操業を余儀なく強いられる。したがって、ローリング防止対策は不可欠であり、船体サイズに比べて過大なビルジキールが取り付けられる。   In general, in a bilge keel, two thin plates in the longitudinal direction are fixed to the left and right side of the ship by welding or the like. That is, rolling can be reduced by the effect of bilge keel vortex accompanying vortex rolling (vortex-making damping). The size of the bilge keel varies depending on the ship. For example, in a pelagic tuna longline fishing boat, the length is 1/3 to 1/2 of the ship length and the width is about 0.5 m. In particular, fishing boats, which are small and medium-sized vessels, are easily affected by waves due to their small hull size, and are forced to sail and operate under stormy weather. Therefore, anti-rolling measures are indispensable and an excessive bilge keel is attached compared to the hull size.

他方、ビルジキールは、船体に取り付けられる付加物の一つである。このビルジキールの形状が、航走中の船体まわりの流れ(以下、流線と表現する)に沿っていない場合、ビルジキールが流線を遮断することになり、船体抵抗の増加を誘発する。近年、地球温暖化防止の観点より、船舶において省エネ性能向上が望まれている。省エネ促進のため、ビルジキールの形状は、本来のローリング防止機能のみならず、抵抗増加を防ぐ観点から、低抵抗型の設計が必要とされる。そこで、解決しようとする課題は、船舶における低抵抗型ビルジキールを提供することである。   On the other hand, the bilge keel is one of the attachments attached to the hull. When the shape of the bilge keel does not follow the flow around the hull during navigation (hereinafter referred to as a streamline), the bilge keel will block the streamline, which causes an increase in hull resistance. In recent years, from the viewpoint of preventing global warming, improvement in energy saving performance is desired in ships. In order to promote energy saving, the shape of the bilge keel requires not only the original anti-rolling function but also a low resistance design from the viewpoint of preventing resistance increase. Therefore, a problem to be solved is to provide a low resistance bilge keel in a ship.

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。   The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

請求項1においては、船舶(1)の左右舷のビルジ部領域(9・9)に、それぞれに長手方向に設けられるビルジキール(10)において、該ビルジキール(10)は、細長体により構成し、該ビルジキール(10)の側面視形状は、曲線の凹凸の状態が変わる点である変曲点を2つ具備し、該船舶(1)の前方からはまず、凹型円弧状で始まり、中央部付近に1つ目の変曲点(B1)を構成し、該変曲点(B1)の後部は凸型円弧状が続き、該凸型円弧状が続いた後に、2つ目の変曲点(B2)を構成し、該変曲点(B2)の後部は続いて緩やかな凹型円弧状としたものである。 In claim 1, in the bilge keel (10) provided in the longitudinal direction in the bilge part regions (9, 9) of the left and right side of the ship (1), the bilge keel (10) is constituted by an elongated body, The side view shape of the bilge keel (10) has two inflection points, which are the points where the uneven state of the curve changes, starting from the front of the ship (1) with a concave arc shape, and near the center The first inflection point (B1) is formed, and the rear part of the inflection point (B1) is followed by the convex arc shape, and after the convex arc shape is continued, the second inflection point ( B2), and the rear part of the inflection point (B2) has a gentle concave arc shape .

請求項2においては、請求項1記載のビルジキールにおいて、前記ビルジキール(10)の前半部の凹型の下端と、後半部の凹型の上端との距離(c)は、少なくとも船体のビルジ部領域(9)を越えない高さとしたものである。 According to a second aspect of the present invention, in the bilge keel according to the first aspect, the distance (c) between the concave lower end of the front half of the bilge keel (10) and the upper end of the concave lower half of the bilge keel is at least a bilge portion region (9) of the hull. ) Not to exceed the height .

本発明の効果として、以下に示すような効果を奏する。   As effects of the present invention, the following effects can be obtained.

請求項1においては、船舶(1)の左右舷のビルジ部領域(9・9)に、それぞれに長手方向に設けられるビルジキール(10)において、該ビルジキール(10)は、細長体により構成し、該ビルジキール(10)の側面視形状は、曲線の凹凸の状態が変わる点である変曲点を2つ具備し、該船舶(1)の前方からはまず、凹型円弧状で始まり、中央部付近に1つ目の変曲点(B1)を構成し、該変曲点(B1)の後部は凸型円弧状が続き、該凸型円弧状が続いた後に、2つ目の変曲点(B2)を構成し、該変曲点(B2)の後部は続いて緩やかな凹型円弧状としたので、船舶のビルジキールを船体まわりの流れ(流線)に沿うように変曲点を有する曲線状とすることで、航走中の流体抵抗を低減し、航走時における船舶の燃費削減が実現できる。 In claim 1, in the bilge keel (10) provided in the longitudinal direction in the bilge part regions (9, 9) of the left and right side of the ship (1), the bilge keel (10) is constituted by an elongated body, The side view shape of the bilge keel (10) has two inflection points, which are the points where the uneven state of the curve changes, starting from the front of the ship (1) with a concave arc shape, and near the center The first inflection point (B1) is formed, and the rear part of the inflection point (B1) is followed by the convex arc shape, and after the convex arc shape is continued, the second inflection point ( B2), and the rear part of the inflection point (B2) has a gentle concave arc shape, so that the bilge keel of the ship has a curved shape having an inflection point so as to follow the flow (streamline) around the hull. As a result, the fluid resistance during sailing is reduced and the fuel efficiency of the ship during sailing is reduced. Kill.

また、数学的変曲点を有する曲線のうち、より簡易な形状を選択することでビルジキールの製作を容易にでき、製造コスト及び製造工数を削減できる。   In addition, by selecting a simpler shape among curves having mathematical inflection points, the bilge keel can be easily manufactured, and the manufacturing cost and the number of manufacturing steps can be reduced.

請求項2においては、請求項1記載のビルジキールにおいて、前記ビルジキール(10)の前半部の凹型の下端と、後半部の凹型の上端との距離(c)は、少なくとも船体のビルジ部領域(9)を越えない高さとしたので、ローリング防止効果を失うことなく、抵抗低減効果を発揮することが出来るのである。 According to a second aspect of the present invention, in the bilge keel according to the first aspect, the distance (c) between the concave lower end of the front half of the bilge keel (10) and the upper end of the concave lower half of the bilge keel is at least a bilge portion region (9) of the hull. ) , The resistance reduction effect can be exhibited without losing the rolling prevention effect.

次に、発明の実施の形態を説明する。図1は本発明の実施例に係る低抵抗型ビルジキールを備えた漁船を示した側面図、図2は図1におけるAA´断面図、図3は(a)低抵抗型ビルジキールの斜視図(b)同じく側面図である。図4は低抵抗型ビルジキールの解析結果を示したグラフ図、図5は従来型ビルジキールの解析結果を示したグラフ図、図6は低抵抗型ビルジキールと従来型ビルジキールとの有効馬力の比較解析を示したグラフ図である。なお、説明を分かり易くするため、図1及び図3は矢印の向きを漁船1(取り付ける船舶)の進行方向としている。   Next, embodiments of the invention will be described. 1 is a side view showing a fishing boat equipped with a low-resistance bilge keel according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA ′ in FIG. 1, and FIG. 3 is a perspective view of a low-resistance bilge keel (b) It is also a side view. 4 is a graph showing the analysis result of the low resistance bilge keel, FIG. 5 is a graph showing the analysis result of the conventional bilge keel, and FIG. 6 is a comparative analysis of the effective horsepower between the low resistance bilge keel and the conventional bilge keel. FIG. In addition, in order to make explanation easy to understand, in FIGS. 1 and 3, the direction of the arrow is the traveling direction of the fishing boat 1 (ship to be attached).

本発明の実施例を、大きさが約400トン程度の遠洋マグロ延縄漁船とする。この遠洋マグロ延縄漁船は、遠洋マグロ延縄漁業に使用される漁船である。遠洋マグロ延縄漁業とは、延縄を用いて沖合でマグロを捕獲する漁業である。図1及び図2に示すように、漁船1の船上には、マグロを引き上げるための切り込み2、延縄漁船特有の長いロープを扱うラインホーラー(揚縄機) 3、ラインワインダー(揚縄時の幹縄の処理・格納) 4などが装備されている。また、捕獲したマグロの鮮度を保つために、−60℃の超低温で冷凍するための冷凍機室6及び急速凍結室7が、船体内部に設けられている。冷凍されたマグロは、同じく船体内部に多数設けられた魚倉8に保存される。   An embodiment of the present invention is a pelagic tuna longline fishing boat having a size of about 400 tons. This pelagic tuna longline fishing boat is a fishing boat used for pelagic tuna longline fishing. The pelagic tuna longline fishery is a fishery that uses tuna to catch tuna offshore. As shown in FIGS. 1 and 2, on the fishing boat 1, there are a notch 2 for raising tuna, a line hauler (lifting machine) 3 for handling long ropes peculiar to longline fishing boats, and a line winder (stem at the time of lifting) 4) Equipment for handling and storage of ropes. Moreover, in order to maintain the freshness of the captured tuna, a refrigerator room 6 and a quick freezing room 7 for freezing at an ultralow temperature of −60 ° C. are provided inside the hull. The frozen tuna is stored in a fishhouse 8 that is also provided inside the hull.

ビルジキール10は、船体外板のビルジ部分(船底と舷側の接点付近)9の前後方向につけた「ひれ」のようなものである。このビルジキールは、船舶のローリングに伴うビルジキール渦の効果(造渦減衰)により、ローリングの減少を図ることができる。ビルジキールを取り付けたローリング低減対策は、細長板を取り付けるのみなので、最も古くから、また広く船舶に用いられている。   The bilge keel 10 is like a “fin” attached in the front-rear direction of the bilge portion (near the contact point between the bottom of the ship and the shore) 9 of the hull outer plate. This bilge keel can reduce rolling due to the effect of bilge keel vortex (vortex-making damping) that accompanies the rolling of the ship. The rolling reduction measure with a bilge keel is the oldest and widely used on ships since it only attaches an elongated plate.

本発明の低抵抗型ビルジキール10について説明する。図1及び図3に示すように、低抵抗型ビルジキール10の側面形状は、凹型円弧状で始まり、中央部付近に1つ目の変曲点B1(図3(b)中)があり、凸型円弧状が続いた後、2つ目の変曲点B2(図3(b)中)があり、続いて緩やかな凹型円弧状を有する細長体としている。また、側面形状の輪郭を形成する曲線は滑らかな流線形とする。さらに、前半部の下端(凹型の下端)と後半部の上端(凹型の上端)との距離c(図3(b)中)は、少なくとも船体のビルジ部領域9を越えない高さにする。ここでいう変曲点とは、数学的意味にて、曲線f(x)の第二次導関数f″(x)が正から負或いは負から正に切り替わる点をいう。つまり、曲線の凹凸の状態が変わる点が変曲点である。言い換えれば、変曲点を有する曲線は、少なくとも1つ以上の凹及び凸が存在する曲線であると言える。 The low resistance bilge keel 10 of the present invention will be described. As shown in FIG. 1 and FIG. 3, the side shape of the low resistance bilge keel 10 starts with a concave arc shape, and has a first inflection point B1 (in FIG. 3 (b)) near the center. After the arc shape continues, there is a second inflection point B2 (in FIG. 3 (b)), followed by a slender body having a gentle concave arc shape. Also, the curve forming the side-shaped contour is a smooth streamline. Further, the distance c (in FIG. 3B) between the lower end of the front half (concave lower end) and the upper end of the rear half ( concave upper end ) is set to a height that does not exceed at least the bilge part region 9 of the hull. The inflection point here means a point where the second derivative f ″ (x) of the curve f (x) switches from positive to negative or from negative to positive in a mathematical sense. In other words, the curve having the inflection point is a curve having at least one concave and convex.

図4及び図5は、低抵抗型ビルジキール10と従来型ビルジキールの形状を数学的に解析した結果を示している。図4及び図5において、横軸xは船体側面位置(x=0が船首、x=0.5が船体中央)を示し、縦軸f(x)はビルジキールの側面高さ(x=0が船底)を示し、その解析であるf(x)の第一次導関数f′(x)及びf(x)の第二次導関数f″(x)を示している。図4に示すように、本発明の実施例では、低抵抗型ビルジキール10の側面形状の曲線f(x)の第二次導関数f″(x)には、正から負或いは負から正に切り替わる点が2個所あり、変曲点を2個有していることがわかる。一方、図5に示すように、従来のビルジキールの例では、ビルジキール側面形状の曲線f(x)の第二次導関数f″(x)には、正から負或いは負から正に切り替わる点がなく、変曲点が存在せず、側面形状の曲線f(x)は単純な放物線に近い形状であることがわかる。   4 and 5 show the results of mathematical analysis of the shapes of the low resistance bilge keel 10 and the conventional bilge keel. 4 and 5, the horizontal axis x indicates the hull side surface position (x = 0 is the bow, x = 0.5 is the hull center), and the vertical axis f (x) is the side height of the bilge keel (x = 0 is The ship's bottom) is shown, and the analysis shows the first derivative f ′ (x) of f (x) and the second derivative f ″ (x) of f (x). As shown in FIG. In the embodiment of the present invention, the second derivative f ″ (x) of the side-shaped curve f (x) of the low-resistance bilge keel 10 has two points that are switched from positive to negative or from negative to positive. There are two inflection points. On the other hand, as shown in FIG. 5, in the example of the conventional bilge keel, the second derivative f ″ (x) of the curve f (x) of the bilge keel side surface shape has a point of switching from positive to negative or from negative to positive. No inflection point exists, and it can be seen that the side surface shape curve f (x) is a shape close to a simple parabola.

低抵抗型ビルジキール10の断面形状(図2参照)は、特に限定していない。本実施例は、従来同様の横長の長方形としている。実際、従来ビルジキールは、断面形状が三角形状又は流線形状のものなど多様に存在する。そこで、低抵抗型ビルジキール10についても、側面形状が変曲点を有する曲線状であれば、断面形状は特に限定しない。また、低抵抗型ビルジキール10は、従来同様に船体外板の左右側面のビルジ部9に、それぞれ取り付けるものとする。取り付け方法については、特に限定せず、従来同様の取り付け方法で問題ない。   The cross-sectional shape (see FIG. 2) of the low resistance bilge keel 10 is not particularly limited. In this embodiment, the horizontally long rectangle is the same as the conventional one. Actually, there are various conventional bilge keels having a triangular or streamline cross-sectional shape. Therefore, the cross-sectional shape of the low-resistance bilge keel 10 is not particularly limited as long as the side surface shape is a curved shape having an inflection point. The low resistance type bilge keel 10 is attached to the bilge portions 9 on the left and right side surfaces of the hull outer plate as in the conventional case. The mounting method is not particularly limited, and there is no problem with the conventional mounting method.

一般に、ビルジキール形状が航走中の船体まわりの流れ(以下、流線と表現する)に沿っていない場合、ビルジキールが流線を遮断することなり、船体抵抗の増加を誘発することは理論上明らかである。従来、抵抗増加を防ぐ観点から、漁船用ビルジキールを科学的に設計することは困難であった。その理由は、第1に、流線の把握が困難であったことによる。流線は船体形状に支配されるが、漁業種類、漁業規模毎に船体形状は千差万別であり、漁船毎に流線を予測することは困難であった。第2に、漁船は、漁港発・漁場着・漁場発・漁港着のそれぞれの状態で載荷状態が変わり、流線は一定でないことによる。ある条件で流線を推定し、これに沿うビルジキールを計画しても、載荷状態が変われば流線が変わり、効果が失われる可能性がある。第3に、流線は、航走時の船体沈下の影響、及び自由表面の影響を受け、さらに船体周りには境界層と称される複雑流れが存在するが、漁船用ビルジキールの設計において考慮が不可欠な、これら船体沈下影響・自由表面影響・境界層影響の把握が困難であったことによる。   In general, it is theoretically clear that if the bilge keel shape does not follow the flow around the hull that is running (hereinafter referred to as streamline), the bilge keel will block the streamline and induce an increase in hull resistance. It is. Conventionally, it has been difficult to scientifically design bilge keels for fishing boats from the viewpoint of preventing an increase in resistance. The first reason is that it was difficult to grasp the streamline. The streamline is governed by the shape of the hull, but the shape of the hull varies from fishery type to fishery scale, making it difficult to predict the streamline for each fishing boat. Secondly, the loading status of fishing boats changes depending on the state of departure from fishing port, arrival at fishing ground, departure from fishing ground and arrival at fishing port, and the streamline is not constant. Even if a streamline is estimated under certain conditions and a bilge keel is planned along with it, the streamline may change if the loading state changes, and the effect may be lost. Thirdly, streamlines are affected by hull subsidence during navigation and the influence of free surfaces, and there is a complex flow called a boundary layer around the hull, which is considered in the design of bilge keels for fishing boats. This is due to the fact that it was difficult to grasp the effects of the hull settlement, free surface effects, and boundary layer effects.

そこで、本発明の低抵抗型ビルジキール10の形状を決定するにあたっては、船型研究開発用に構築した数値計算法(ヘス・スミス法・ランキンソース法・流線計算法・境界層計算法)を活用することにより、漁船の船体形状・載荷状態・船体沈下影響・自由表面影響・境界層影響など複雑要因を考慮した流れ場の推定を可能にし、さらに回流水槽による流線の分析技術を援用することにより、漁船のビルジキールの設計を科学的に行うことができるようにした。そこで、本発明の低抵抗型ビルジキール10の開発を行った結果、載荷条件の変化が船底流線に及ぼす影響は2次的で、ビルジキール形状の最適化が可能であることを解明した。ついで、最適化を行った結果、変曲点を有する曲線状である細長体を側面形状としたビルジキールを創出した。本発明の低抵抗型ビルジキールの細部形状は漁船毎に異なると考えられるが、変曲点を伴う形状となることが基本的な特徴であり、従来の経験的に作られ変曲点のない単純な放物線の形状のビルジキールとは異質のものである。   Therefore, in determining the shape of the low resistance bilge keel 10 of the present invention, the numerical calculation methods (Hes Smith method, Rankine source method, streamline calculation method, boundary layer calculation method) constructed for ship type research and development are utilized. This makes it possible to estimate the flow field in consideration of complex factors such as fishing boat hull shape, loading condition, hull subsidence effect, free surface effect, boundary layer effect, etc., and also use streamline analysis technology with a circulating water tank This enables scientific design of fishing boat bilge keels. Therefore, as a result of developing the low resistance type bilge keel 10 of the present invention, it has been clarified that the influence of the change of the loading condition on the bottom streamline is secondary, and the bilge keel shape can be optimized. Next, as a result of optimization, a bilge keel with a curved elongated body having an inflection point was created. The detailed shape of the low resistance type bilge keel of the present invention is considered to be different for each fishing boat, but the basic feature is that it has a shape with an inflection point. The parabola-shaped bilge keel is different.

図6に示すように、低抵抗型ビルジキール10は、その抵抗低減効果を実験にて確認している。この実験において、低抵抗型ビルジキール10を取り付けた模型船と、従来型ビルジキールを取り付けた模型船とを、回流水槽にて抵抗試験を行うことでそれぞれの抵抗を比較した。図6は、横軸はノットにて表した船速Vsを、縦軸は従来型ビルジキールを取り付けた模型船に対する低抵抗型ビルジキールを取り付けた模型船の有効馬力について低減の割合εを示している。その結果、低抵抗型ビルジキール10は、従来型ビルジキールに比べ航走速度に対する依存性はあるが、最大3〜4%の抵抗軽減効果があることを確認できた。なお、本実験で使用した模型船は、実際に建造する予定である遠洋マグロ延縄漁船を縮小したものである。   As shown in FIG. 6, the low-resistance bilge keel 10 has confirmed the resistance reduction effect by experiment. In this experiment, the resistance was compared between the model ship with the low resistance bilge keel 10 and the model ship with the conventional bilge keel by performing a resistance test in a circulating water tank. In FIG. 6, the horizontal axis represents the boat speed Vs expressed in knots, and the vertical axis represents the reduction ratio ε for the effective horsepower of the model ship with the low resistance type bilge keel compared to the model ship with the conventional bilge keel. . As a result, it was confirmed that the low resistance bilge keel 10 had a resistance reduction effect of 3 to 4% at the maximum although it was more dependent on the traveling speed than the conventional bilge keel. The model ship used in this experiment is a reduced version of the pelagic tuna longline fishing boat that is actually planned to be built.

本来、ビルジキールの機能は、船体のローリングに伴い周囲の流体を攪乱し、渦や波をつくることである。その結果、ビルジキールに作用する流体力、並びにビルジキール周辺の船体に働く圧力は、船体のローリングを減ずるモーメントを生じさせる。本発明の低抵抗型ビルジキール10は、抵抗削減を目的として、側面形状を、変曲点を有する曲線にしたが、船体のビルジ部9に低抵抗型ビルジキール10を設けることで、ビルジキールのローリング防止機能を損なうことはない。即ち、低抵抗型ビルジキール10は、ローリング防止効果を失うことなく、抵抗低減効果を有している。   Originally, the function of the bilge keel is to disturb the surrounding fluid as the hull rolls, creating vortices and waves. As a result, the fluid force acting on the bilge keel, as well as the pressure acting on the hull around the bilge keel, creates a moment that reduces hull rolling. The low resistance type bilge keel 10 of the present invention has a curved side surface with an inflection point for the purpose of reducing resistance. By providing the low resistance type bilge keel 10 in the bilge part 9 of the hull, the rolling prevention of the bilge keel is prevented. There is no loss of functionality. That is, the low resistance bilge keel 10 has a resistance reduction effect without losing the rolling prevention effect.

ビルジキールは、船体に取り付けるのみの装置である。取り付け方法は、ブラケットによる取り付けや溶接による取り付けの場合が多い。すなわち、船体の保守・点検のためにドックに引き上げたときに、従来ビルジキールから低抵抗型ビルジキール10へ交換できる。つまり、既存の船舶に対しても、低抵抗型ビルジキール10を交換することで、容易に省エネ効果が得られる。   The bilge keel is a device that is only attached to the hull. In many cases, the mounting method is bracket mounting or welding. That is, the conventional bilge keel can be replaced with the low resistance type bilge keel 10 when it is pulled up to the dock for maintenance and inspection of the hull. That is, an energy saving effect can be easily obtained even by replacing the low resistance bilge keel 10 with an existing ship.

現在、地球温暖化防止対策の一環として、省エネ対策が課題となっている。本発明は、この省エネ対策として、漁船1のみならず一般の船舶に広く応用できると考える。また、本発明の実施例では、変曲点を2点有する低抵抗型ビルジキール10としたが、船体の大きさや形状に伴い1点又は3点以上の変曲点を有する低抵抗型ビルジキールも、本実施例同様に抵抗軽減の効果が得られる。   Currently, energy conservation measures are an issue as part of global warming prevention measures. The present invention can be widely applied not only to the fishing boat 1 but also to general ships as an energy saving measure. In the embodiment of the present invention, the low resistance bilge keel 10 has two inflection points. However, the low resistance bilge keel having one or three or more inflection points in accordance with the size and shape of the hull, As in this embodiment, the effect of reducing the resistance can be obtained.

本発明の実施例に係る低抵抗型ビルジキールを備えた漁船を示した側面図。The side view which showed the fishing boat provided with the low resistance type bilge keel which concerns on the Example of this invention. 図1におけるAA´断面図。AA 'sectional drawing in FIG. (a)低抵抗型ビルジキールの斜視図(b)同じく側面図。(A) Perspective view of low resistance type bilge keel (b) Side view. 低抵抗型ビルジキールの解析結果を示したグラフ図。The graph which showed the analysis result of the low resistance type bilge keel. 従来型ビルジキールの解析結果を示したグラフ図。The graph which showed the analysis result of the conventional bilge keel. 低抵抗型ビルジキールと従来型ビルジキールとの有効馬力の比較解析を示したグラフ図。The graph which showed the comparative analysis of the effective horsepower of a low resistance type bilge keel and a conventional type bilge keel.

1 船舶(漁船)
9 ビルジ部領域
10 低抵抗型ビルジキール
B1・B2 変曲点
1 Vessel (fishing boat)
9 Bilge area 10 Low resistance bilge keel
B1 and B2 inflection points

Claims (2)

船舶(1)の左右舷のビルジ部領域(9・9)に、それぞれに長手方向に設けられるビルジキール(10)において、該ビルジキール(10)は、細長体により構成し、該ビルジキール(10)の側面視形状は、曲線の凹凸の状態が変わる点である変曲点を2つ具備し、該船舶(1)の前方からはまず凹型円弧状で始まり、中央部付近に1つ目の変曲点(B1)を構成し、該変曲点(B1)の後部は凸型円弧状が続き、該凸型円弧状が続いた後に、2つ目の変曲点(B2)を構成し、該変曲点(B2)の後部は続いて緩やかな凹型円弧状としたことを特徴とする舶用ビルジキール。 In the bilge keel (10) provided in the longitudinal direction in the left and right bilge area (9, 9) of the ship (1), the bilge keel (10) is constituted by an elongated body, and the bilge keel (10) The shape of the side view has two inflection points, which are the points where the unevenness of the curve changes, starting from the front of the ship (1) with a concave arc shape, and the first inflection near the center. Constituting a point (B1), the rear part of the inflection point (B1) continues with a convex arc shape, and after the convex arc shape continues, a second inflection point (B2) is constituted, A marine bilge keel characterized in that the rear part of the inflection point (B2) has a gentle concave arc shape . 請求項1記載の舶用ビルジキールにおいて、前記ビルジキール(10)の前半部の凹型の下端と、後半部の凹型の上端との距離(c)は、少なくとも船体のビルジ部領域(9)を越えない高さとしたことを特徴とする舶用ビルジキール。 The marine bilge keel according to claim 1, wherein the distance (c) between the concave lower end of the front half of the bilge keel (10) and the upper end of the concave lower half of the bilge keel (10) does not exceed at least the bilge part region (9) of the hull. marine bilge keel which is characterized in that Satoshi.
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Publication number Priority date Publication date Assignee Title
JPS6146789A (en) * 1984-08-13 1986-03-07 Mitsubishi Heavy Ind Ltd Split type bilge keel
JPS62137289A (en) * 1985-12-10 1987-06-20 Mitsubishi Heavy Ind Ltd Bilge keel with rear extension part
JPH0297189U (en) * 1989-01-19 1990-08-02

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6146789A (en) * 1984-08-13 1986-03-07 Mitsubishi Heavy Ind Ltd Split type bilge keel
JPS62137289A (en) * 1985-12-10 1987-06-20 Mitsubishi Heavy Ind Ltd Bilge keel with rear extension part
JPH0297189U (en) * 1989-01-19 1990-08-02

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