US3705564A - Ship hull for ice-breaking ship - Google Patents

Ship hull for ice-breaking ship Download PDF

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Publication number
US3705564A
US3705564A US114611A US3705564DA US3705564A US 3705564 A US3705564 A US 3705564A US 114611 A US114611 A US 114611A US 3705564D A US3705564D A US 3705564DA US 3705564 A US3705564 A US 3705564A
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US
United States
Prior art keywords
ship
hull
ice
wave
angle
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.)
Expired - Lifetime
Application number
US114611A
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English (en)
Inventor
Jens Wilhelmsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FREDRIKSSTAD MEK VERKSTED AS
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FREDRIKSSTAD MEK VERKSTED AS
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Publication of US3705564A publication Critical patent/US3705564A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/08—Ice-breakers or other vessels or floating structures for operation in ice-infested waters; Ice-breakers, or other vessels or floating structures having equipment specially adapted therefor

Definitions

  • ABSTRACT A ship hull for ice-breaking ship of the kind where the opposite sides of the ship hull skin is given a particular curvature inorder to increase the ability of the hull to break ice formations.
  • the ship hull sides are given a wave-shaped curvature, such that the waves slope in direction backwards relative to the horizontal plane at an angle in the range from 0 to 25.
  • the ship sides are cantilevered outwards in a per se known fashion.
  • the steepest configuration of the wave surface has an angle in direction outwards relative to the vertical axis which is not less than 5, preferably is not exceeding 20.
  • the present invention relates to a new ship hull for ice-breaking ships, more particularly a ship hull con! figuration wherein the hull side is given a particular configuration with the aim to increase the ice-breaking ability of the ship hull side.
  • lce-breaking ships are therefore generally designed with outwardly cantilevered hull sides such that only a very short section of the mid portion of the ship, that is,
  • FIG. 1 is showing a schematic cross-section through the left half part of a ship hull configurated in accordance with the invention, while FIG. 2 is showing a schematic lateral view of the ship hull illustrated in FIG. 1.
  • the reference number 2 designates the'bottom of the ship hull
  • 4 designates the main deck
  • the present invention relates to a new embodiment of a ship hull for ice-breaking ships,of the kind where the hull side is given a curvature in order to increase the ability of the hull to break the ice, and the present invention is generally characterized therein that the ship hull sides are given a wave shaped curvature with the waves sloping backwards relative to the horizontal at a desired angle having from 0 to 25 simultaneously as the ship hull sides are cantilevered outwardly in per se known way.
  • the new ship hull configuration involves in several ways an improvement in connection with ice-breaking ships.
  • An important advantage is thus that the particular wave shape implies that the flank angle of the ship sides against the adjacent ice masses varies at all levels and thereby creates a pulsating effect which implies anincrease in the ice breaking ability of the hull, not only at the forward section of the ship, but also along the ship sides, a fact which is of large importance in connection with long ships.
  • the new ship hull configuration must thus be assumed to be particularly suitable for large ships, with large mass forces and large engine effect, since these forces can in an effective way be utilized with the aim to break the ice masses passing along the sides of the ship.
  • a ship hull in accordance with the invention is configurated such that the wave has a surface such that a tangent through a vertical plane through the steepest area of the wave surface is directed outwards relative to the vertical axis and presenting an angle of not less than 5, but not larger than 20.
  • the center line through the wave-shaped ship hull side measured in a vertical plane should be straight lined and slope outwards at an angle B of about 70 from the horizontal plane.
  • the length of the waves are not particularly critical, and may for instance be given a length of l 2 m.
  • the letters LWL designate the draught of the ship when loaded, MWL is the mean draught line, while BWL is the water line under light draught.
  • the line 8 is the mean line or center line through the waveshaped ship hull side measured in a vertical plane, such that the angle [3 designates the angle between the mean line and the horizontal plane, as shown.
  • the steepest course of the wave surface will as shown be located in the areas designated with the letter S on each wave curvature, and as previously mentioned the angle 8 with the horizontalplane must not be less than 5.
  • the tangent drawn in a vertical plane at the steepest area of the wave surface is designated with the letter T.
  • FIG. 2 illustrates how the wave curvature illustrated in FIG. 1 is localized on the ship hull side.
  • Thewave curvature which is indicated with the lines 10,10, etc., are preferably substantially straight, and are sloping downwards in direction backwards along the ship hull and presenting an angle a with the horizontal plane and which as previously mentioned should be selected in the range from 0 to 25, in dependence of several factors, such as the size of the ship, the engine force, the length of the ship, etc.
  • the wave curvature area is preferably limited to that section of the hull laying between the points A and B, which designate the substantially straight-lined portion of the ship hull viewed in an horizontal projection.
  • the ship sides are preferably constructed of pressed steel plates having corrugations or waves as shown, since such waves will present a large resistance against deformation due to the pressure from the ice masses and the ship propulsion machinery. Calculations have shown that the production costs and the material weights will be lower when utilizing the ship hull construction in accordance with the invention than utilizing corresponding conventional ship hull sides and with the same constructional strengths.
  • the invention is particularly developed with the aim to be used in connection with large tankers for use in arctic areas.
  • Ship hull for an ice-breaking ship whereby the ship hull skin is given a particular curvature to increase the ability of the hull to break ice formations
  • a hull having ship hull sides with a wave-shaped curvature the waves of said curvature sloping in a direction backwards relative to the horizontal plane at an angle in the range from 0 to 25 and 'said ship sides being cantilevered outwardly.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physical Water Treatments (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US114611A 1970-02-13 1971-02-11 Ship hull for ice-breaking ship Expired - Lifetime US3705564A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO0515/70A NO123932B (ko) 1970-02-13 1970-02-13

Publications (1)

Publication Number Publication Date
US3705564A true US3705564A (en) 1972-12-12

Family

ID=19877646

Family Applications (1)

Application Number Title Priority Date Filing Date
US114611A Expired - Lifetime US3705564A (en) 1970-02-13 1971-02-11 Ship hull for ice-breaking ship

Country Status (4)

Country Link
US (1) US3705564A (ko)
CA (1) CA923766A (ko)
DE (1) DE2106776A1 (ko)
NO (1) NO123932B (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942837A (en) * 1988-02-18 1990-07-24 Thyssen Nordseewerke Gmbh Ice breaker
CN108622309A (zh) * 2018-05-25 2018-10-09 哈尔滨工程大学 共振破冰船舶艏部结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3630578A1 (de) * 1986-09-09 1988-03-10 Thyssen Nordseewerke Gmbh Eisbrechendes schiff
US5325803A (en) * 1991-01-16 1994-07-05 Thyssen Nordseewerke Gmbh Icebreaking ship
DE4215334A1 (de) * 1992-05-09 1993-11-11 Thyssen Nordseewerke Gmbh Eisbrechendes Schiff

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US993440A (en) * 1909-10-29 1911-05-30 Elouild Duplessis Ice-breaker.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US993440A (en) * 1909-10-29 1911-05-30 Elouild Duplessis Ice-breaker.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942837A (en) * 1988-02-18 1990-07-24 Thyssen Nordseewerke Gmbh Ice breaker
CN108622309A (zh) * 2018-05-25 2018-10-09 哈尔滨工程大学 共振破冰船舶艏部结构

Also Published As

Publication number Publication date
CA923766A (en) 1973-04-03
DE2106776A1 (de) 1971-09-02
NO123932B (ko) 1972-02-07

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