JPS59216789A - Reduction method of hull vibration - Google Patents
Reduction method of hull vibrationInfo
- Publication number
- JPS59216789A JPS59216789A JP58091242A JP9124283A JPS59216789A JP S59216789 A JPS59216789 A JP S59216789A JP 58091242 A JP58091242 A JP 58091242A JP 9124283 A JP9124283 A JP 9124283A JP S59216789 A JPS59216789 A JP S59216789A
- Authority
- JP
- Japan
- Prior art keywords
- propeller
- hull
- wake
- reducing
- bubble area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/15—Propellers having vibration damping means
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、プロペラ起振力を抑制することにより、船体
の振動を軽減させるようにする手段に係るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to means for reducing vibrations of a ship's hull by suppressing propeller excitation force.
航行中の船体の撮動は、主機等より伝播される内部要因
に基づくものとか、波浪４ソの外部費因によりも／ζら
されるものとか或いはそれらが競合した場合前を始め発
生原因は複雑多様であるが、ゾロペラ部分に生ずる起振
力が船体振動の支配的な要素となっていることは神種の
事例より知られている。Photographing the hull during navigation may be based on internal factors propagated by the main engine, etc., or may be caused by external factors such as waves, or if these conflict, the cause of occurrence may be determined. Although it is complex and diverse, it is known from examples of divine species that the excitation force generated in the Zoropera part is the dominant factor in ship vibration.
プロペラ起振力には次の２通りがある。すなわち、
（ａ） ベアリング フォース（ｂｅａｒｉｎｇ ｆ
ｏｒｃｅ ）と称するもので、不拘−流場内でプロペラ
が回転するために、プロペラに非定常力及びモーメント
が発生することによるもの。There are two types of propeller excitation force: That is, (a) bearing force (bearing f
This is due to the generation of unsteady forces and moments on the propeller due to its rotation in an unconfined flow field.
（ｂ） サーフイス フォース（５ｕｒｆａｃｅ ｆ
ｏｒｃｅ ）と称するもので、回転するプロペラ真の通
過による圧力変動が直接プロペラ直上の船体森面に伝わ
るもので、これはプロペラ先端・（のキャビテーション
発生により急激に用人する。(b) Surface force
The pressure fluctuation caused by the passing of the rotating propeller is directly transmitted to the surface of the hull directly above the propeller, which rapidly deteriorates due to the occurrence of cavitation at the tip of the propeller.
このようなプロペラ起１辰力への対応策としては、（ａ
）のベアリング フォースを減少させるには、組型改良
、付加物取付は等により船体の伴？ＩＣをプロペラ回転
円の周方向に均一化さ亡ることであり、（ｂ）のサーフ
イス フォースをへυ少させるには伴流外ＸＨの均一化
と共に、プロペラ先端の回転円と船底との間隙であるチ
ップ クリアランスの増大又は船体表面のプロペラに対
向する都城に圧力緩衝装置を付加すること等が考えられ
る。As a countermeasure against such propeller force, (a
) In order to reduce the bearing force of the hull, improve the assembly, install additional parts, etc. to reduce the hull tension. In order to reduce the surface force in (b) to υ, it is necessary to make the IC uniform in the circumferential direction of the propeller rotation circle, and to reduce the surface force to υ, it is necessary to equalize the outside wake Possible solutions include increasing the tip clearance or adding a pressure buffer to the wall facing the propeller on the hull surface.
しかし、プロペラ回＜Ｌ＜円に流入する［１６１５分布
を均一化するには、アップ クリアランスとの関連によ
る影１！！を受け、実用化されている船尾船型では理想
的な伴流分布は実際上沓るのが稚しく、また、圧力緩衝
装置の句加もそれ自体の構造強ｐ［の保全が船体抵抗の
増大につながる結果となり、総合的な解決策とはなり得
なかったのである。However, the flow into the propeller rotation < L < circle [1615 To make the distribution uniform, the shadow 1 due to the relationship with the up clearance! ! As a result, the ideal wake distribution in the stern hull type that has been put into practical use is difficult to achieve in practice, and the addition of a pressure buffer also increases the hull resistance due to the maintenance of its own structural strength. As a result, it could not be a comprehensive solution.
本発明は斯かる現況に鑑がみなされたもので、プロペラ
回転円の頂部、いわゆるプロペラトップ付近におけるｆ
ｌ−流のウェーク ピークを１９’４消させると共に船
体表面に緩１冑効果を生起させる両様の効果をも）也ら
せることにより船体振動を軽減せしめる方法の快供を目
的としている。The present invention was developed in view of the current situation, and is designed to improve f at the top of the propeller rotation circle, the so-called propeller top.
The purpose of this invention is to provide a method for reducing hull vibration by eliminating the wake peak of the l-flow by 19'4 and also producing a slow 19'4 effect on the hull surface.
以下、本発明方法につき具体的な実施の１例に基づき説
明する。Hereinafter, the method of the present invention will be explained based on a specific example of implementation.
従来の通常組型では、伴流分布（４）に１！クシては船
ｍヲＶｓ、伴流のプロペラへの流入速度にプロペラ前進
速度）をＶａとした場合に次式の、によシ得られる伴流
係数Ｗの等分布曲線として第１図に示すような状態とな
り、ビルジ渦成分（５）と共にプロペラトップ（２）の
付近において生ずるウェークピーク（６）が大きくなシ
がちである。これがベアリング フォースを増大させ、
さらにキャビテーションの発生ともなってサーフイス
フォースをも増大させる結果となるので、このようなプ
ロペラトップ（２）部又はその近傍におけるウェークピ
ーク（６）を何らかの方法で抑止又は減少させなければ
ならない。In the conventional normal set type, wake distribution (4) has 1! Figure 1 shows the uniform distribution curve of the wake coefficient W obtained by the following equation, where the comb is the ship m, Vs, and the speed at which the wake flows into the propeller is the propeller forward speed. In this situation, the wake peak (6) generated near the propeller top (2) tends to be large together with the bilge vortex component (5). This increases the bearing force,
In addition, cavitation may occur and the surf
Since this results in an increase in the force, such a wake peak (6) at or near the propeller top (2) must be suppressed or reduced in some way.
この目的のためには、第２図に示すように、たとえば主
機（６）を発生源とする排ガス流０→を、ブロワαＱを
介して船体ＯＱのプロペラ（ｌ］）上部に設けた噴気ノ
ズル（２）より噴出せしめ、プロペラ トップ（２）位
置及びその付近に噴射気泡域α〜を形成せしめるのであ
る。For this purpose, as shown in FIG. (2) to form an injection bubble region α~ at and around the propeller top (2) position.
このような手段の採択によりその効果として、（イ）
ガス体の噴出によりプロペラ０１）に流入する水の流速
を増大させることができ、ウェーク ピーク（６）は格
段に減少し、第１図の伴流分布（４）において鎖線で示
すようにピークを殆んど消滅させ得る、
（ロ） プロペラ（ロ）と船体叫との間に、プロペラト
ップ（２）を中心として噴射気泡域ψ９が形成されるか
ら、プロペラ（ｌυによる多様な発生圧力に対して有効
な緩衝作用を示す、
等の顕著な機能が発、！、１１．され、プロペラ起振力
は大巾に減少し、同時に帽体への伝ｔｉｌｔも有効に阻
止されるのである。As a result of adopting such measures, (a)
The flow rate of water flowing into the propeller 01) can be increased by the ejection of gas, and the wake peak (6) is significantly reduced, and the peak as shown by the chain line in the wake distribution (4) in Figure 1 is reduced. (b) Between the propeller (b) and the hull, an injection bubble region ψ9 is formed around the propeller top (2), so it is The propeller excitation force is greatly reduced, and at the same time, the transmission of tilt to the cap body is effectively prevented.
本発明方法の実施例の１つとして、第３図に示すように
船体−の船底部がフラットな船は、噴気ノズルからのガ
ス体はプロペラ回転円（１）の上部に噴射気泡域ｕｌを
・形成して、気泡は後方に流れ、上ｉ己（イ）、（ロ）
の諸効果を確実にもたらすことができる。ｉ＊、４４図
に示すように船底部がプロペラ回転円（１）上部でかな
り■観となっている船では、噴気ノズルから噴出される
気しドがそのままでは上方に放散されるので、このよう
な船渠では小さなフィン恨７）を、噴気ノズル開口端よ
りプロペラ上部の間に適宜長さで設けることによりプロ
ペラ回転円（１）の上部に噴射気泡域明を形成すること
ができ、；官３図に示す実施例と同じ効果を帰ることが
できる。なお、この第４図に示す実Ｍ 同におけるフィ
ン幹）は、プロペラ回転円（１）上部の噴射気泡域（１
９イ亡沫全するのほかに１公知のごとくウェーク ピー
ク（６）を減少にも貢献するものであり、噴射気ｉ１店
域の形成により得られる効果と相俟ってプロペラ起振力
を抑止することを可能とするのである。また、このフィ
ンは、第４図に示す船渠と第３図に示す船渠との中間タ
イプ或いは２軸船等の多軸船にも通用できて、噴気ノズ
ルから１′Ｆ〔出される気体を制御して有効な噴射気泡
域を形成しイ（Ｉることはいうまでもない。As one embodiment of the method of the present invention, as shown in Fig. 3, in a ship with a flat hull bottom, the gas body from the jet nozzle has an injection bubble area ul above the propeller rotation circle (1).・The bubbles form and flow backwards, forming upper i (a), (b)
It is possible to reliably bring about the following effects. i*, As shown in Figure 44, in a ship where the bottom of the ship is located above the propeller rotation circle (1), the air emitted from the jet nozzle will be dissipated upward if left undisturbed. In such docks, by providing a small fin 7) with an appropriate length between the opening end of the jet nozzle and the upper part of the propeller, an injection bubble region can be formed at the upper part of the propeller rotation circle (1); The same effect as the embodiment shown in FIG. 3 can be obtained. Note that the actual M (fin stem in the same figure) shown in Fig. 4 is the injection bubble area (1) above the propeller rotation circle (1).
9 In addition to completely eliminating the spray, it also contributes to reducing the wake peak (6) as is well known, and together with the effect obtained by the formation of the injection air i1 store area, it suppresses the propeller excitation force. It makes it possible to do so. In addition, this fin can be used for an intermediate type between the dock shown in Figure 4 and the dock shown in Figure 3, or a multi-shaft ship such as a two-shaft ship, and can control the gas discharged from the jet nozzle by 1'F. Needless to say, this will form an effective injection bubble area.
第１図は本発明方法における伴随分Ａｌｉの改善の説明
図、第２図は実施例の説明図、第３図は具体レリを示す
船尾船底部の図、第４図は他の具体例を示す図である。
（１）・・・プロペラ回転円 （２）・・・プロペ
ラ トップ（力・・・プロペラ軸 （４２・・
伴流分布（５）・・・ビルジ硝成分 （６）・・
・ウェーク ピーク叫・・・脂 体 （
ｌ刀・・・プロペラＱ４・・・主 機ｕ４・・・ブロワ
リ勺・・・リドガス流 μＧ・・・噴射気泡
域ｕす・・・１！＃、気ノズル ｕｉ）・・・
フィン出願人 （１１［本美貴！□、：；
１） ・（
代理人 三木上２１・・−、’、ｌｉ
１ニアｅ、−’ １．１Fig. 1 is an explanatory diagram of the improvement of the accompanying Ali in the method of the present invention, Fig. 2 is an explanatory diagram of the embodiment, Fig. 3 is a diagram of the bottom of the stern showing the concrete relief, and Fig. 4 is a diagram of another specific example. FIG. (1)... Propeller rotation circle (2)... Propeller top (force... propeller shaft (42...
Wake distribution (5)... Bilge nitrate component (6)...
・Wake peak scream... fat body (
L sword...Propeller Q4...Main unit U4...Blowery force...Lid gas flow μG...Injection bubble area Usu...1! #, air nozzle ui)...
Finn applicant (11 [Miki Moto!
Claims (1)
プロワ及び噴気ノズルを経てプロペラ回転円直上部に噴
出させてゾロベラ回転円と船尾船底部と間に噴射気泡域
を形成せしめ、気泡噴出に基づく水流の増速によりウエ
ークビークオ減少せしめると共に、気泡による圧力緩衝
効果をもたらせて、プロペラ起振力を低減し、振動の伝
ｍを抑止するようにしたこと全特徴とする船体振動の軽
減方法。Gases such as exhaust gas generated by the main engine installed in the hull,
The bubbles are ejected directly above the propeller rotation circle through the blower and the blower nozzle to form an injection bubble area between the Zorobella rotation circle and the bottom of the stern, reducing the wake volume by increasing the speed of the water flow based on the bubble ejection. A method for reducing hull vibration, which is characterized by providing a pressure buffering effect, reducing propeller excitation force, and suppressing vibration transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58091242A JPS59216789A (en) | 1983-05-23 | 1983-05-23 | Reduction method of hull vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58091242A JPS59216789A (en) | 1983-05-23 | 1983-05-23 | Reduction method of hull vibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59216789A true JPS59216789A (en) | 1984-12-06 |
Family
ID=14020948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58091242A Pending JPS59216789A (en) | 1983-05-23 | 1983-05-23 | Reduction method of hull vibration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59216789A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003010045A1 (en) | 2001-07-20 | 2003-02-06 | Kvaerner Warnow Werft Gmbh | Reduction of propeller-induced pressure fluctuations by introduction of air |
| KR101031269B1 (en) | 2009-06-09 | 2011-04-29 | 삼성중공업 주식회사 | Ship of hull-vibration reduction type |
| KR101149505B1 (en) * | 2009-10-27 | 2012-05-25 | 삼성중공업 주식회사 | Device for reducing propeller excitation force |
-
1983
- 1983-05-23 JP JP58091242A patent/JPS59216789A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003010045A1 (en) | 2001-07-20 | 2003-02-06 | Kvaerner Warnow Werft Gmbh | Reduction of propeller-induced pressure fluctuations by introduction of air |
| DE10135474A1 (en) * | 2001-07-20 | 2003-02-06 | Kvaerner Warnow Werft Gmbh | ship |
| DE10135474B4 (en) * | 2001-07-20 | 2005-10-20 | Kvaerner Warnow Werft Gmbh | ship |
| CN100415601C (en) * | 2001-07-20 | 2008-09-03 | 克维尔纳沃诺沃福特有限公司 | Reduction of propeller-induced pressure fluctuations by introduction of air |
| KR101031269B1 (en) | 2009-06-09 | 2011-04-29 | 삼성중공업 주식회사 | Ship of hull-vibration reduction type |
| KR101149505B1 (en) * | 2009-10-27 | 2012-05-25 | 삼성중공업 주식회사 | Device for reducing propeller excitation force |
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