EP0161953A1 - Schiff mit drei halbeintauchbaren Schwimmk rpern - Google Patents

Schiff mit drei halbeintauchbaren Schwimmk rpern Download PDF

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Publication number
EP0161953A1
EP0161953A1 EP85400603A EP85400603A EP0161953A1 EP 0161953 A1 EP0161953 A1 EP 0161953A1 EP 85400603 A EP85400603 A EP 85400603A EP 85400603 A EP85400603 A EP 85400603A EP 0161953 A1 EP0161953 A1 EP 0161953A1
Authority
EP
European Patent Office
Prior art keywords
float
semi
ship
submersible
hand
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.)
Granted
Application number
EP85400603A
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English (en)
French (fr)
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EP0161953B1 (de
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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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/de
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Publication of EP0161953B1 publication Critical patent/EP0161953B1/de
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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
    • B63B1/10—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 relative shapes and 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.
  • the Applicant has performed by providing that, in this vessel, a) the ratio of the ordinate of the curve of the areas of the ship to the point of intersection of the curves of the areas of the lateral floats of a part, and the central float on the other hand, at the maximum ordinate of said curve of the areas of the ship is at least equal to 0.45; and, b) the ratio of the sum of the volumes of the lateral floats taken together on the one hand, to the volume of the central float on the other hand is between 0.3 and 1.7.
  • AI is substantially equal to AM3 and AM5.
  • AM1 is therefore equal, substantially to any one of these three values.
  • Curve A1 is flat between the V3AR and V5A7 planes. 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, particularly 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 of 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, A ⁇ is substantially equal to AM.
  • 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 semi-submersible floats (and aft ⁇ 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.
  • the wave resistance is significantly lower because on the one hand, the elongation of the three semi-submersible floats can 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 the 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 central 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 constituted by the assembly of a totally submerged hull and a leg ' connecting it to at least the surface of the water.
  • Elongation of a semi-submersible float Elongation is the ratio of the length of the curve of the areas of 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.
  • the amount 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. With the dissymmetry coefficient DIS of a float is defined by the equality:
EP19850400603 1984-04-02 1985-03-28 Schiff mit drei halbeintauchbaren Schwimmk rpern Expired EP0161953B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=9302729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850400603 Expired EP0161953B1 (de) 1984-04-02 1985-03-28 Schiff mit drei halbeintauchbaren Schwimmk rpern

Country Status (8)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0873934A3 (de) * 1997-04-21 1999-11-24 Marcelo Luis Dodero Schiff mit Rumpf der durch ellipsoidförmige, ganztauchende Schwimmer unterstürtzt ist
FR2960206A1 (fr) * 2010-05-19 2011-11-25 Architecture Et Conception De Sytemes Avances Navire comportant une superstructure dont la partie inferieure est equipee d'une quille

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2159451B1 (es) * 1998-04-17 2002-04-16 Antoune Ivan Lahuerta El hidrobus.
CN104709435A (zh) * 2015-03-01 2015-06-17 徐见金 三体人工通气超空泡船型

Citations (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

Patent Citations (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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0873934A3 (de) * 1997-04-21 1999-11-24 Marcelo Luis Dodero Schiff mit Rumpf der durch ellipsoidförmige, ganztauchende Schwimmer unterstürtzt ist
FR2960206A1 (fr) * 2010-05-19 2011-11-25 Architecture Et Conception De Sytemes Avances Navire comportant une superstructure dont la partie inferieure est equipee d'une quille

Also Published As

Publication number Publication date
ES541779A0 (es) 1988-03-01
ES8801886A1 (es) 1988-03-01
FI851295A0 (fi) 1985-04-01
NO851246L (no) 1985-10-03
CA1256324A (en) 1989-06-27
EP0161953B1 (de) 1987-06-03
JPS60226385A (ja) 1985-11-11
FI851295L (fi) 1985-10-03
DE3560211D1 (en) 1987-07-09
FR2562026A1 (fr) 1985-10-04

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