US3653352A - Hull form of a ship provided with a cylindrical bow - Google Patents

Hull form of a ship provided with a cylindrical bow Download PDF

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Publication number
US3653352A
US3653352A US36839A US3653352DA US3653352A US 3653352 A US3653352 A US 3653352A US 36839 A US36839 A US 36839A US 3653352D A US3653352D A US 3653352DA US 3653352 A US3653352 A US 3653352A
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US
United States
Prior art keywords
hull
full
fin
bow
bluntness
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Expired - Lifetime
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US36839A
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English (en)
Inventor
Takeshi Tomiyama
Masanobu Sudow
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/06—Shape of fore part
    • B63B1/063—Bulbous bows
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

  • the total hull resistance of a ship includes many components having different physical causes.
  • the greater part of the total resistance is the viscous resistance.
  • theory in the field of viscous resistance has not developed sufficiently to enable a practically useful theoretical approach even to design of the forward portions of a ship.
  • the bow form generally known as a cylindrical bow has a minimum resistance in the full loaded condition when properly designed to suit the main hull portion, but is inferior, in the ballasted condition as regards resistance, to a well designed bulbous bow suited to the main hull portions, which latter gives low resistance in a ballasted condition.
  • the resistance and propulsive performance of the bulbous bow are, however, very sensitive to changes of the forward draft due to the alteration of load or other conditions, and so in extreme cases the bulbous hull form can give the worst results in overall comparison tests.
  • FIG. 1 is a diagrammatical system for the hull of a ship
  • FIG. 2 is a diagrammatic representation of a measure of the bluntness of a hull form of the invention
  • FIG. 3A is a diagrammatic side view of the bow or stem tion of a hull fonn embodying the present invention
  • FIG. 3B is a diagrammatic plan view of hull sections of FIG. 3A taken at the several elevations A-F of FIG. 3A;
  • FIG. 4 is a graph diagrammatically illustrating the variation in bluntness of the bow or stem portion of FIG. 3, with changing draft;
  • FIG. 5 is a graph diagrammatically illustrating the results of tests on conventional cylindrical and bulbous bow hull forms and a hybrid of both types.
  • FIGS. 6 and 7 diagrammatically represent the results of comparative model tests on the three hull forms of FIG. 5 and on two additional forms constructed in accordance with the present invention, the graph of FIG. 6 representing the performance under ballasted conditions while the graph of FIG. 7 illustrates the performance under fully loaded conditions.
  • the total resistance of the hull of a ship may be broken down in general as follows, according to the cause of the various resistance components:
  • FIG. 2 illustrates this definition, the bluntness at the cross section illustrated therein being Y.
  • the invention provides a full form ship hull having a block coefficient of 0.75 or more and a length of 120 meters or more between perpendiculars, in which l) the bluntness Y, (as hereinbefore defined) of the portion of the fore edge of the stem in the region of the fully loaded water line lies within the following limits:
  • a protruding portion 5 extends forwards therefrom for a distance I where 0.02 L s l 0.04 L (L,,, is the length between perpendiculars) (4) the bluntness (Y,,) of the fore edge of that partof the protruding portion more than 1/3 ahead of the perpendicular portion is substantially constant and
  • the extent of the perpendicular portion below the full load water line should be determined according to the depth at which the undesirable influence of the term exp(K Z sec 0), resulting from the existence of a bulbous part in the aforementioned formula (I) becomes small, if the advantages of a cylindrical bow in the full-loaded condition are to be maintained.
  • the principles of item (II) can be applied to the upper part of the forward projection, making it less blunt, and it may be formed as a slightly convex ridge up to about the height of the wave surface generated at service speed in the ballasted condition. This requires a rapid decrease in the bluntness of the fore edge of the stem in the downward direction, but this can be arranged by suitably pairing the lines around the bow.
  • bluntness of protruding portion fore edge projecting by more than 1/3 is between 0 and Y,/3 (see FIG. 4)
  • bluntness Y extends below water line by at least percent of fully loaded draft (see FIGS. 3 and 4)
  • the graphs in FIGS. 6 and 7 show that the hull forms CF and CF surpassed their parental hull forms in both ballast and fully loaded conditions.
  • the result of providing the substantially constant bluntness Y, for the substantially cylindrical bow in the region of the fullload line and the substantially constant bluntness Y for the fin, as illustrated in FIG. 4, is particularly apparent from FIG. 38 from which the simplicity of the structure of the invention is clearly apparent and from which it is apparent that the results of the invention are achieved primarily by improving a cylindrical bow.
  • the forwardly projecting fin as is apparent from the lower portion of FIG. 3A, has a continuous convex curvature extending forwardly and downwardly to the front tip of the fin and then rearwardly and downwardly to a point beneath the cylindrical bow at the full-load line region.
  • the fin has a relatively small radius of curvature with the center of the curvature of the fin at least at its front tip region being situated behind the tip but forwardly of the bow portion which is of substantially cylindrical configuration at the full-load line.
  • a hull form according to the present invention has the merits both of a cylindrical bow and a bulbous bow simultaneously and, as will be apparent from the above test results, enables a decrease of the water resistance offered by the hull in both the fully loaded condition and the ballasted condition.
  • said hull having in the region of said full-load line a bow of substantially cylindrical configuration extending vertically through a given depth and having a substantially constant first bluntness, and said hull having in the region of said ballast line a forwardly projecting continuously curved, convex fin of a substantially constant second bluntness which is substantially less than said first bluntness, and said fin having an upper portion of the configuration of a convex ridge forming a transition between the cylindrical portion at the full-load line and the forwardly projecting fin at the ballast line.
  • a full form ship hull said hull having a block coefficient of 0.75 or more, a length between perpendiculars of at least meters, a stern, said stem having a fore edge and a fully loaded water line, in which:
  • bluntness Y (as hereinbefore defined) of a portion of said fore edge of said stem in the region of said fully loaded water line lies within the following limits;
  • said portion of said fore edge of said stem extends perpendicularly below said fully loaded water line at said fore edge of said stern by at least l5 percent of the fully loaded draft with substantially the same bluntness;
  • a protruding portion is provided below said portion of said fore edge, said protruding portion extending forwards therefrom for a distance I where;

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  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Traffic Control Systems (AREA)
  • Physical Water Treatments (AREA)
  • Vibration Prevention Devices (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Road Paving Structures (AREA)
  • Earth Drilling (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
US36839A 1969-05-16 1970-05-13 Hull form of a ship provided with a cylindrical bow Expired - Lifetime US3653352A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44037589A JPS5011671B1 (enrdf_load_stackoverflow) 1969-05-16 1969-05-16

Publications (1)

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US3653352A true US3653352A (en) 1972-04-04

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US36839A Expired - Lifetime US3653352A (en) 1969-05-16 1970-05-13 Hull form of a ship provided with a cylindrical bow

Country Status (8)

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US (1) US3653352A (enrdf_load_stackoverflow)
JP (1) JPS5011671B1 (enrdf_load_stackoverflow)
ES (1) ES379615A1 (enrdf_load_stackoverflow)
FR (1) FR2048483A5 (enrdf_load_stackoverflow)
GB (1) GB1300666A (enrdf_load_stackoverflow)
NL (1) NL151308B (enrdf_load_stackoverflow)
NO (1) NO134578C (enrdf_load_stackoverflow)
SE (1) SE407379B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946687A (en) * 1974-08-06 1976-03-30 Newport News Shipbuilding And Drydock Company Conical bulbous bow
US4581416A (en) * 1981-01-19 1986-04-08 Societe Nationale Des Poudres Et Explosifs Process for the synthesis of tertiary phosphine oxides and sulfides, and new tertiary phosphine oxides and sulfides
CN1319811C (zh) * 2003-11-28 2007-06-06 住友重机械工业株式会社 船舶
US20080149014A1 (en) * 2005-03-09 2008-06-26 Ulsteinvik Design As Foreship Arrangement for a Vessel of the Displacement Type
USD742803S1 (en) 2013-10-11 2015-11-10 Ulstein Design & Solutions As Stern of ship hull
US9908589B1 (en) 2016-04-26 2018-03-06 Stephen Lee Bailey Hull shape for improved powering and seakeeping
CN115626244A (zh) * 2022-10-26 2023-01-20 中国船舶集团有限公司第七○八研究所 一种防气泡的艏部内凹船型

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302603A (en) * 1963-10-15 1967-02-07 Exxon Research Engineering Co Ship's hull construction
US3306244A (en) * 1965-08-25 1967-02-28 Lindenau Schiffswerft Bow bulb for ships
US3362369A (en) * 1965-04-08 1968-01-09 Messrs Mitsubichi Jukogyo Kabu Form of the hull of a low speed, full form ship

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302603A (en) * 1963-10-15 1967-02-07 Exxon Research Engineering Co Ship's hull construction
US3362369A (en) * 1965-04-08 1968-01-09 Messrs Mitsubichi Jukogyo Kabu Form of the hull of a low speed, full form ship
US3306244A (en) * 1965-08-25 1967-02-28 Lindenau Schiffswerft Bow bulb for ships

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946687A (en) * 1974-08-06 1976-03-30 Newport News Shipbuilding And Drydock Company Conical bulbous bow
US4581416A (en) * 1981-01-19 1986-04-08 Societe Nationale Des Poudres Et Explosifs Process for the synthesis of tertiary phosphine oxides and sulfides, and new tertiary phosphine oxides and sulfides
CN1319811C (zh) * 2003-11-28 2007-06-06 住友重机械工业株式会社 船舶
US20080149014A1 (en) * 2005-03-09 2008-06-26 Ulsteinvik Design As Foreship Arrangement for a Vessel of the Displacement Type
US7658159B2 (en) 2005-03-09 2010-02-09 Ulsteinvik Design As Foreship arrangement for a vessel of the displacement type
US20110120361A1 (en) * 2005-03-09 2011-05-26 Ulsteinvik Design As Foreship arrangement for a vessel of the displacement type
EP2530008B1 (en) 2005-03-09 2017-04-05 Ulstein Design & Solutions AS A vessel with an improved foreship arrangement
USD742803S1 (en) 2013-10-11 2015-11-10 Ulstein Design & Solutions As Stern of ship hull
US9908589B1 (en) 2016-04-26 2018-03-06 Stephen Lee Bailey Hull shape for improved powering and seakeeping
CN115626244A (zh) * 2022-10-26 2023-01-20 中国船舶集团有限公司第七○八研究所 一种防气泡的艏部内凹船型

Also Published As

Publication number Publication date
GB1300666A (en) 1972-12-20
NL7007037A (enrdf_load_stackoverflow) 1970-11-18
NL151308B (nl) 1976-11-15
JPS5011671B1 (enrdf_load_stackoverflow) 1975-05-02
NO134578B (enrdf_load_stackoverflow) 1976-08-02
DE2023963A1 (de) 1971-03-25
ES379615A1 (es) 1973-01-16
SE407379B (sv) 1979-03-26
NO134578C (no) 1980-06-30
DE2023963B2 (de) 1975-10-09
FR2048483A5 (enrdf_load_stackoverflow) 1971-03-19

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