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Vessel

A technology for ships and bows, applied in the direction of hull, ship construction, hull design, etc., can solve the problems of large bow wave, large wave resistance, deck area limitation, etc., and achieve the effect of less energy consumption and less resistance

Active Publication Date: 2017-11-28
MITSUI ENG & SHIPBUILD CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] As a result, there is the following problem: the deeper the draft, the larger the wave generated at the bow, and the greater the wave-making resistance
However, there is a problem that in this large ship, the deck area of ​​the upper portion of the bow arranged above the maximum waterline is limited, and there is no consideration of wave-making resistance from a lightly loaded state to a fully loaded state.

Method used

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Embodiment Construction

[0037] Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings. The ship of this embodiment is a displacement type ship, where the planned ship speed is Vs, the length between perpendiculars is Lpp, the profile is B, and the columnar coefficient of the front half of the hull is Cpf.

[0038] Under this condition, when the gravitational acceleration is set as g, according to ΔHm=V 2 The ΔHm calculated by / (2g) is set as the maximum water head height ΔHm, and the ΔHs calculated according to ΔHs=0.3×ΔHm is set as the reference water head height ΔHs. In addition, according to γs=tan -1 The angle γs calculated by [0.5×B / {(1-Cpf)×Lpp}] (°: degree) is set as the reference bow angle γs.

[0039] In addition, if figure 1 and figure 2 As shown, the ship 1 according to the first embodiment of the present invention is configured to have a bow bulb 5 below the light-load waterline Db, and set the range of "0<Rs<γs+15°" w...

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Abstract

A displacement-type vessel (1) having a stem bulb 5 below a light load line Db, and being configured such that a specified vertical range Ra of a stem portion, in which a stem angle [gamma] falls continuously within a specified stem angle range Rs, includes a first range R1 from a first lower limit position Ha1, which matches a full load line Df, to a first upper limit position Hb1, which is higher than the full load line Df by a reference head height [delta]Hs, where the reference stem angle [gamma]s of the stem portion on one board is the angle calculated by [gamma]s=tan-1 [0.5*B / {(1-Cpf)*Lpp}](degree), and the specified stem angle range Rs is the range of 0<Rs<[gamma]s+15 DEG with respect to the reference stem angle [gamma]s. Thus, wave resistance is reduced for all drafts from light load draft to full load draft.

Description

technical field [0001] The present invention relates to a ship having a bow shape capable of reducing the wave-making resistance of the bow in all drafts from a light-load draft to a full-load draft, and a design method of the ship. Background technique [0002] In a displacement-type ship, the shape near the front end of the bow, that is, the bow shape, requires a shape with low wave-making resistance in order to reduce the energy required for propulsion of the ship. [0003] If the shape of the bow is large, the water flowing into the bow is likely to be blocked when the ship moves forward, and the water surface rises due to the dynamic pressure, so large water surface waves are generated, and the wave-making resistance increases. Furthermore, in waves, incident waves are reflected significantly forward, resulting in a large increase in drag. Therefore, in the shape of the bow of the ship, the shape near and below the full-load waterline is designed so that the vicinity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/06B63B1/40
CPCB63B1/06B63B1/40Y02T70/10
Inventor 山本虎卓冈沙织秋林秀聪藤田智
Owner MITSUI ENG & SHIPBUILD CO LTD
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