EP0161953B1 - Navire comportant trois flotteurs semi-submersibles - Google Patents

Navire comportant trois flotteurs semi-submersibles Download PDF

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Publication number
EP0161953B1
EP0161953B1 EP19850400603 EP85400603A EP0161953B1 EP 0161953 B1 EP0161953 B1 EP 0161953B1 EP 19850400603 EP19850400603 EP 19850400603 EP 85400603 A EP85400603 A EP 85400603A EP 0161953 B1 EP0161953 B1 EP 0161953B1
Authority
EP
European Patent Office
Prior art keywords
float
semi
submersible
areas
floats
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
Application number
EP19850400603
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0161953A1 (fr
Inventor
André Marius Mauric
Jean-Charles Nahon
Jean-Michel Forestier
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.)
Innomer Innovation Et Techniques de la Mer Civile Dite Ste
Original Assignee
Innomer Innovation Et Techniques de la Mer Civile Dite Ste
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Filing date
Publication date
Application filed by Innomer Innovation Et Techniques de la Mer Civile Dite Ste filed Critical Innomer Innovation Et Techniques de la Mer Civile Dite Ste
Publication of EP0161953A1 publication Critical patent/EP0161953A1/fr
Application granted granted Critical
Publication of EP0161953B1 publication Critical patent/EP0161953B1/fr
Expired 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 
    • 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
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • 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
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B2001/128—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls

Definitions

  • the object of the present invention is, in particular, to optimize the shapes and relative locations of the semi-submersible floats, by defining such new particular provisions.
  • the invention therefore relates to a ship comprising three semi-submersible floats connected to a bridge by legs, a central float being arranged in front and two lateral floats being arranged symmetrically with respect to the longitudinal plane of the central float, such as the principle is disclosed in US-A-1,815,286, for example.
  • the main concern of the naval architect when designing a ship of this type is therefore to solve the problem of reducing the forward resistance, and more particularly the wave resistance, on which the previous projects acted and failed.
  • FR-A-1 414492 defines the principles of provisions, which, for this type of ship, allow the reduction of wave resistance.
  • AI is substantially equal to AM3 and AM5.
  • AM1 is therefore substantially equal to any one of these three values.
  • the curve A1 is flat between the planes V 3 AR and V 5 AV. This is very favorable for obtaining a low wave resistance for the speeds corresponding to a Froude number of about 0.4 to 0.6 (curve A1 “balanced” between the front and the rear of the ship and free of accentuated hollows or peaks, especially in the area of plane VI).
  • the volume of the two lateral semi-submersible floats 5-8 on the one hand, and the volume of the central semi-submersible float 3-6 on the other hand, are substantially equal (surfaces of the curves of the areas A3 and A5 substantially equal) which allows, in the trimaran arrangement adopted, to further minimize the wave resistance.
  • the volumes of the lateral 5-8 and central 3-6 semi-submersible floats are substantially equal. This is a limit realization, suitable for high speeds (Fn> 0.6), AI / AM1 having to be chosen in principle greater than 0.45 to allow the maximum reduction in wave resistance.
  • FIG. 6 is characterized by a strong imbalance in the volumes of the lateral semi-submersible floats 5-8 on the one hand, of the central semi-submersible float 3-6 on the other hand: the ratio of these volumes is equal to 0.3. Again, this is a lower limit below which you should not go down. Furthermore AI / AM1 is substantially equal to 1, which is satisfactory.
  • FIG. 7 represents an embodiment in which the volume of the lateral (and rear) semi-submersible floats 5-8 is equal to 1.7 times that of the central (and front) semi-submersible float 3-6. This achievement constitutes the upper limit not to be exceeded. Furthermore, AI is substantially equal to AM1.
  • FIG. 8 represents an embodiment in which the curve of the areas A1 of the ship has a high asymmetry.
  • the ship's dissymmetry coefficient DIS is 0.3, which is the upper limit below which it is best to stay.
  • the lateral (and rear) semi-submersible floats 5-8 are belly relative to the central submersible float, front 3-6.
  • the coefficient of elongation of said floats is approximately equal to 7.
  • the shapes should be chosen so that the elongation coefficient is between 5 and 10.
  • a semi-submersible vessel has a performance roughly equivalent to that of a conventional surface vessel of the same tonnage, which makes this technique viable.
  • the wave resistance is notably lower because on the one hand, the elongation of the three semi-submersible floats may be more favorable than that of the two semi-submersible floats of a catamaran, on the other hand, the choice of the longitudinal overlap of the curves of the areas A3 and A5 makes it possible to avoid annoying interference between the flows along the central semi-submersible float 3-6 and lateral semi-submersible floats 5- 8 and, again, reduce the wave resistance.
  • the very choice of the curve of the areas A1 preferably the flattest between the two vertices of the curves of the areas A3 and A5 and in the vicinity of point 1 is, on this point, a guarantee of a significant reduction in the resistance to advancement.
  • the recommended structure is particularly robust.
  • catamarans for example, have generally fragile structures, given the very significant constraints that develop there.
  • the new structure type "trimaran” which is proposed does not have this previously known fragility because on the one hand the ship is generally supported on 3 points instead of 4 for catamarans, on the other hand the fins 9 close the structure formed by the legs 6 and 8 and the hulls 3 and 5.
  • the forces in the area of attachment of the legs 6 and 8 to the body 1 are much lower than those existing in the equivalent areas of connection of the floats of a semi-catamaran submersible at the center point of said catamaran.
  • the submerged part of the hull of a ship is usually defined by the values of its successive vertical cross-sections between the verticals passing through the submerged end points of the hull, called PPAV and PPAR in the direction of the length of the ship.
  • PPAV and PPAR in the direction of the length of the ship.
  • This volume is equal to the area delimited on the graph representing the curve of the areas of the vertical cross sections, by this curve of the areas and the x-axis.
  • An immersed body can be defined, at least partially, by horizontal sections.
  • semi-submersible float designates such a body with positive buoyancy, the curve of the areas of its horizontal sections (or water lines) having a maximum below the surface of the water at a depth TCL.
  • the value of this maximum is preferably greater than twice the value of the area of the horizontal section at the waterline.
  • TCL designates the arithmetic mean of said depths.
  • a semi-submersible float is made up of a whole totally submerged hull and a leg connecting it to at least the surface of the water.
  • the elongation is the ratio of the length of the curve of the areas of the vertical cross sections to the equivalent diameter of this semi-submersible float.
  • the longitudinal asymmetry of the float corresponds to the differences in values of the areas of vertical cross sections corresponding to abscissas x and (-x), symmetrical with respect to the origin of the abscissas. is a representation of this asymmetry. It has the dimensions of a volume and it is possible, and naturally preferable, to transform it to obtain a dimensionless coefficient. To do this, simply divide it by the volume V of the float.
  • the dissymmetry coefficient DIS of a float is defined by the equality:

Landscapes

  • Ocean & Marine Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Toys (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Artificial Fish Reefs (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
EP19850400603 1984-04-02 1985-03-28 Navire comportant trois flotteurs semi-submersibles Expired EP0161953B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8405161A FR2562026A1 (fr) 1984-04-02 1984-04-02 Navire comportant trois flotteurs semi-submersibles
FR8405161 1984-04-02

Publications (2)

Publication Number Publication Date
EP0161953A1 EP0161953A1 (fr) 1985-11-21
EP0161953B1 true EP0161953B1 (fr) 1987-06-03

Family

ID=9302729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850400603 Expired EP0161953B1 (fr) 1984-04-02 1985-03-28 Navire comportant trois flotteurs semi-submersibles

Country Status (8)

Country Link
EP (1) EP0161953B1 (no)
JP (1) JPS60226385A (no)
CA (1) CA1256324A (no)
DE (1) DE3560211D1 (no)
ES (1) ES8801886A1 (no)
FI (1) FI851295L (no)
FR (1) FR2562026A1 (no)
NO (1) NO851246L (no)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO981678L (no) * 1997-04-21 1998-10-22 Marcelo Luis Dodero Fart°y med skrog bÕret av nedsenkete flott°rer
ES2159451B1 (es) * 1998-04-17 2002-04-16 Antoune Ivan Lahuerta El hidrobus.
FR2960206B1 (fr) * 2010-05-19 2013-08-09 Architecture Et Conception De Sytemes Avances Navire comportant une superstructure dont la partie inferieure est equipee d'une quille
CN104709435A (zh) * 2015-03-01 2015-06-17 徐见金 三体人工通气超空泡船型

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1815286A (en) * 1930-05-16 1931-07-21 William R Blair Seagoing craft
GB809736A (en) * 1957-10-08 1959-03-04 Paul Horsdal Improvements in or relating to boats
FR1414492A (fr) * 1963-11-25 1965-10-15 Perfectionnements aux bateaux
US3623444A (en) * 1970-03-17 1971-11-30 Thomas G Lang High-speed ship with submerged hulls

Also Published As

Publication number Publication date
FI851295L (fi) 1985-10-03
ES541779A0 (es) 1988-03-01
ES8801886A1 (es) 1988-03-01
DE3560211D1 (en) 1987-07-09
CA1256324A (en) 1989-06-27
EP0161953A1 (fr) 1985-11-21
FR2562026A1 (fr) 1985-10-04
JPS60226385A (ja) 1985-11-11
FI851295A0 (fi) 1985-04-01
NO851246L (no) 1985-10-03

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