JPH11263289A - Method for suppressing pitching of hull - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a pitch moment according to a speed by installing fins inclined forward and formed to have tapered front widened rear parts in the drafting line upper parts of both left and right rudders of a bow part. SOLUTION: Each fin has a triangular shape having tapered front and wide rear parts, and a front side thereof is inclined by an angle α in a lower direction in the left and right rudders of a bow part above a drafting line L. Here, when the bow part goes through waves, the fin 12 of the bow part sinks in water, a downward falling force is generated, and the floating force of the bow part and the falling force cancel each other to suppress pitching. Then, when the fin of the bow part passes through waves, since the fin of the bow part is moved away from a water surface to be positioned in air, the downward falling force is eliminated and the floating force of the bow part is also eliminated, and thus the pitching of the ship body is suppressed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、高速船等における船体
のピッチングを抑制する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing pitching of a hull in a high-speed ship or the like.

【０００２】[0002]

【従来の技術】高速船や高速フェリーにおいては、高速
で波浪中を航行する場合、波に出会う周期が短くなるた
め、短周期で縦揺れを起こし、乗客の船酔いや自動車等
の積み荷の荷崩れ等のトラブル等が発生するため船舶の
縦揺れ防止策を施している。従来から船舶のアンチピッ
チング装置として図５に示すように、船体の前方および
後方の両舷に水中翼１１₁、１１₂、１２₁、１２₂を設置
し、これら前後の水中翼１１₁、１１₂、１２₁、１２₂の
角度を制御させて船体の縦揺れ運動を抑制させるアンチ
ピッチング装置は公知である。しかし、上記アンチピッ
チング装置は水中翼１１₁、１１₂、１２₁、１２₂に十分
な揚力を発生させるためには装置が大型化するととも
に、制御装置を必要とするため設備コストがかかる問題
点がある。2. Description of the Related Art In a high-speed ship or a high-speed ferry, when sailing in the sea at high speed, the cycle of encountering the waves becomes short, causing a pitching in a short cycle, causing seasickness of passengers and collapse of cargoes such as automobiles. In order to prevent such troubles, measures are taken to prevent the ship from pitching. Conventionally, as an anti-pitting device for a ship, as shown in FIG. 5, hydrofoils 11 ₁ , 11 ₂ , 12 ₁ , 12 ₂ are installed on both front and rear sides of the hull, and front and rear hydrofoils 11 ₁ , 11 _{1 2,} 12 _1, 12 anti-pitching device for suppression to control the _second angle of pitch movement of the ship are known. However, the above-mentioned anti-pitting device requires a large-sized device to generate sufficient lift on the hydrofoil 11 ₁ , 11 ₂ , 12 ₁ , 12 ₂ , and requires a control device, which increases the equipment cost. There is.

【０００３】[0003]

【発明が解決しようとする課題】そこで、本発明は従来
のかかる問題点を解決し、平水中の推進抵抗を増加せ
ず、制御装置が不要で船の速力に応じたピッチモーメン
トが容易に得られて、簡単な装備で設備コストの安価な
船体のピッチングを抑制する方法を提供することを目的
とする。Accordingly, the present invention solves the above-mentioned conventional problems, does not increase the propulsion resistance in plain water, does not require a control device, and easily obtains a pitch moment according to the speed of the ship. It is an object of the present invention to provide a method for suppressing pitching of a hull with simple equipment and low equipment cost.

【０００４】[0004]

【課題を解決するための手段】船首部の左右両舷の喫水
線上方部に、前方が先細に、後方が広幅に形成されたフ
ィンをそれぞれ前方に傾斜させて設置することにより船
体のピッチングを抑制することを特徴とする。Means for Solving the Problems Suppressing the hull pitching by installing fins with a tapered front and a wide rear incline at the front of the bow above the waterlines on both sides. It is characterized by doing.

【０００５】[0005]

【発明の実施の形態】本発明の実施の形態について図１
により説明する。図１は本発明方法を実施するアンチピ
ッチング・フィン（以下フィンと云う）を取付けた船体
の説明図である。１₁、１₂は船首部の左舷と右舷にそれ
ぞれ固着されるフィンである。これらの各フィンの形状
は図２（ｂ）に示しているように、前方部が先細で後方
部が広幅の三角形に形成されており、各フィンは図２
（ａ）に示しているように喫水線Ｌより上方の船首部の
左舷と右舷に前方を下方にα角度傾斜（迎角α）させて
溶接等で固着されている。また、必要に応じて後尾部の
左舷と右舷に前記船首部のフィン１₁、１₂と同様な形状
のフィン２₁、２₂をフィン１₁、１₂と同様に迎角αで固
着している。なお、これらフィンの取付け位置、角度、
形状の詳細は後述する。FIG. 1 shows an embodiment of the present invention.
This will be described below. FIG. 1 is an explanatory view of a hull provided with anti-pitting fins (hereinafter referred to as fins) for carrying out the method of the present invention. 1 _1, 1 ₂ is a fin which are respectively secured to the port and starboard bow. As shown in FIG. 2 (b), the shape of each of these fins is such that a front portion is formed in a tapered shape and a rear portion is formed in a wide triangle.
As shown in (a), the ship is fixed by welding or the like with a forward inclination of α downward (angle of attack α) on the port side and starboard side of the bow above the water line L. Further, the fin 1 ₁ bow, 1 fin 2 _{1 2} a similar shape, 2 ₂ stuck in the fin 1 _1, 1 ₂ and similarly angle of attack α to port and starboard tail optionally ing. In addition, the mounting position, angle,
Details of the shape will be described later.

【０００６】次に、本発明にかかる船体のピッチングを
抑制する方法について説明する。図３に示すように、高
速船は波浪中を高速で航行するとき、船体が波を貫通
し、波による船体の浮力変化等によりピッチング（縦揺
れ）しながら前進する。船首部が波浪を貫通し図３の
（ａ）の状態になると、船首部のフィン１₁、１₂が没水
し、船速による水流によりこれらのフィン１₁、１₂に下
向きの翼揚力が発生し、船首部の浮力と前記翼揚力が相
殺して船体のピッチングを抑制することができる。Next, a method for suppressing pitching of a hull according to the present invention will be described. As shown in FIG. 3, when a high-speed ship sails in waves at high speed, the hull penetrates the waves and moves forward while pitching (pitching) due to a change in buoyancy of the hull due to the waves. When bow is in a state of (a) Figure 3 through the waves, fins 1 ₁ bow, 1 ₂ is submerged, the fin 1 ₁ of the water flow by the boat speed, 1 ₂ downward wing lift Is generated, the buoyancy of the bow and the wing lift cancel each other out, and pitching of the hull can be suppressed.

【０００７】船首部のフィンが波浪を通過し船体の中央
部が波浪の頂上部に位置する（ｂ）の状態になると、船
首部フィンが水面から離れて空中に位置するため、下向
きの翼揚力が消失するとともに船首部の浮力も消失する
ので船体のピッチングを抑制できる。When the fins of the bow pass through the waves and the center of the hull is located at the top of the waves as shown in (b), the fins of the bow are located in the air away from the water surface, so that the downward wing lift is reduced. Disappears and the buoyancy of the bow part also disappears, so that pitching of the hull can be suppressed.

【０００８】次に、船尾部のフィン２₁、２₂が波に突入
して没水し（ｃ）の状態になると、船首部フィンが没水
したときと同様に船速による水流により船尾部のフィン
２₁、２₂に下向きの翼揚力が発生し、船尾部の浮力と前
記翼揚力が相殺して船体のピッチングを抑制することが
できる。Next, when the fins 2 ₁ , 2 _{2 at} the stern rush into the waves and are submerged in the state (c), the stern at the stern is caused by the water flow due to the boat speed in the same manner as when the fin at the bow is submerged. fins 2 _1, 2 ₂ in a downward wing lift is generated, it can be said as the buoyancy of the aft section wing lift to offset to suppress pitching of the ship.

【０００９】船尾部のフィンが波浪を通過し船体の中央
部が波浪の谷底部に位置する（ｄ）の状態になると、船
尾部フィンが水面から離れて空中に位置するため、下向
きの翼揚力が消失するとともに船尾部の浮力も消失する
ので船体のピッチングを抑制できる。When the fins at the stern pass through the waves and the center of the hull is located at the bottom of the valley of the waves (d), the stern fins are located in the air away from the water surface, and the downward wing lift is reduced. Disappears and the buoyancy of the stern disappears, so that pitching of the hull can be suppressed.

【００１０】上記各フィン１₁、１₂、２₁、２₂の先端部
Ｐの取付け位置は、海象における波浪階級２以下の有義
波高（波高が０．１〜０．５ｍ小波程度で弱いうねりの
状態）に対しては作用しない喫水線ＬからＨの高さを基
準に取付けられる。フィンの取付け角度αと形状は、船
の巡行速力において海象における波浪階級３、４、５毎
の有義波高により発生するピッチモーメントに対抗しう
るフィンの迎角と翼面積を求めこれらの間を連続させる
ことにより翼形状が決定される。図４（ａ）は本発明方
法を実施するアンチピッチング・フィンを単胴船に施し
た例、図４（ｂ）はアンチピッチング・フィンを複胴船
に施した例である。[0010] mounting position of each fin ₁ 1, 1 _2, 2 _1, 2 ₂ of the tip P is wave class 2 below significant wave height (height in the sea conditions are poor at about 0.1~0.5m ripples (The state of swelling) which does not act on the water line L to H. The mounting angle α and the shape of the fin are determined by calculating the angle of attack and the wing area of the fin that can counter the pitch moment generated by the significant wave height of each of the wave classes 3, 4, and 5 in the marine environment at the cruising speed of the ship. The wing shape is determined by making it continuous. FIG. 4A shows an example in which the anti-pitching fins for carrying out the method of the present invention are applied to a monohull, and FIG. 4B shows an example in which the anti-pitting fins are applied to a double-hull.

【００１１】[0011]

【発明の効果】本発明は船首部の左右両舷の喫水線上方
部に、前方が先細に、後方が広幅に形成されたフィンを
それぞれ前方に傾斜させて設置することにより、平水中
の推進抵抗を増加せず、制御装置を使用しなくても船の
速力に応じたピッチモーメントを容易に得ることができ
ので、設備コストを低減できる。According to the present invention, a fin having a tapered front portion and a wide rear portion is provided at an upper portion of the waterline on both the left and right sides of the bow, and the fins are inclined forward and installed, so that the propulsion resistance in flat water is reduced. , And a pitch moment corresponding to the speed of the ship can be easily obtained without using a control device, so that equipment costs can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明方法を実施するアンチピッチングフィン
を取付けた船体の斜視図。FIG. 1 is a perspective view of a hull to which anti-pitting fins for carrying out the method of the present invention are attached.

【図２】本発明方法を実施するアンチピッチングフィン
の形状と船首部への取付け状態の説明図で（ａ）は側面
図、（ｂ）は片側正面図である。FIGS. 2A and 2B are explanatory views of the shape of an anti-pitching fin for carrying out the method of the present invention and a state of attachment to a bow, and FIG. 2A is a side view and FIG.

【図３】本発明の作用を示す説明図。FIG. 3 is an explanatory view showing the operation of the present invention.

【図４】本発明方法を実施するアンチピッチングフィン
を取付けた船体の実施例で、（ａ）は単胴船の例、
（ｂ）は複胴船の例の平面図。FIG. 4 is an embodiment of a hull equipped with anti-pitting fins for implementing the method of the present invention, wherein (a) is an example of a monohull,
(B) is a plan view of an example of a double-hulled ship.

【図５】従来から公知のアンチピッチングフィンを取付
けた船体の平面図。FIG. 5 is a plan view of a hull to which a conventionally known anti-pitching fin is attached.

【符号の説明】[Explanation of symbols]

１₁ 船首部右舷側アンチピッチングフィン １₂ 船首部左舷側アンチピッチングフィン ２₁ 船尾部右舷側アンチピッチングフィン ２₂ 船尾部左舷側アンチピッチングフィン1 ₁ Bow anti-pitting fin on starboard side 1 ₂ Bow anti-pitting fin on port side 2 ₁ Anti-pitching fin on starboard side 2 ₂ Port anti-pitching fin on stern

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】船首部の左右両舷の喫水線上方部に、前方
が先細に、後方が広幅に形成されたフィンをそれぞれ前
方に傾斜させて設置することにより船体のピッチングを
抑制する方法。1. A method for suppressing pitching of a hull by installing fins having a tapered front portion and a wide rear portion at an upper portion of a waterline on both the left and right sides of a bow portion with a forwardly inclined portion. 【請求項２】船首部および船尾部の左右両舷の喫水線上
方部に、前方が先細に、後方が広幅に形成されたフィン
をそれぞれ前方に傾斜させて設置することにより船体の
ピッチングを抑制する方法。2. A fin having a tapered front portion and a wide rear portion is provided at an upper portion of the waterline on both the left and right sides of the bow portion and the stern portion so as to be inclined forward, thereby suppressing pitching of the hull. Method.