EP1375336A1 - Rumpf für auf Binnengewässern fahrenden Schiffe - Google Patents

Rumpf für auf Binnengewässern fahrenden Schiffe Download PDF

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Publication number
EP1375336A1
EP1375336A1 EP03013410A EP03013410A EP1375336A1 EP 1375336 A1 EP1375336 A1 EP 1375336A1 EP 03013410 A EP03013410 A EP 03013410A EP 03013410 A EP03013410 A EP 03013410A EP 1375336 A1 EP1375336 A1 EP 1375336A1
Authority
EP
European Patent Office
Prior art keywords
hull
center
centroid
bow
water
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.)
Withdrawn
Application number
EP03013410A
Other languages
English (en)
French (fr)
Inventor
Claudio Pensa
Giovanni Stefanini
Gino Bertolo
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.)
ACTV SpA
Universita Degli Studi di Napoli di Federico II
Intermarine SpA
Original Assignee
ACTV SpA
Universita Degli Studi di Napoli di Federico II
Intermarine SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ACTV SpA, Universita Degli Studi di Napoli di Federico II, Intermarine SpA filed Critical ACTV SpA
Publication of EP1375336A1 publication Critical patent/EP1375336A1/de
Withdrawn legal-status Critical Current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
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull

Definitions

  • the present invention relates to a hull particularly usable for water buses for inland and lagoon waters.
  • the most common breakdown of the drag of a hull considered as a sum of wave generation, viscous pressure and friction, has a percentagewise weight that is highly variable according to the speed of travel; if it is necessary to also take into account the speed of the water bus, optimizing hull shapes entails assessing the proportions in which the various components involved have an effect, and on the basis of their weight minimizing the causes of drag, especially in the drag system that has the greatest influence (the wave drag, viscous pressure or friction system).
  • the aim of the present invention is to solve the above-mentioned problems, eliminating the drawbacks noted above, by providing a hull, particularly usable for water buses for inland and lagoon waters, that allows to minimize the backwash of the propulsion system, to obtain low exhaust emission values, and to achieve maximum containment of wave generation.
  • an object of the present invention is to provide a hull that allows to achieve these characteristics together with an optimization of performance for at least two different operating speeds of the water bus, one of which is preferably 40% greater than the other.
  • Another object is to provide a hull that allows to minimize the negative effects of the shallow waters in which the water bus moves.
  • Another object is to provide a hull that allows to achieve high safety, understood most of all as transverse stability, good maneuverability, linked to operation, and optimum ease of steering.
  • Another object is to provide a hull that has low manufacturing and operating costs.
  • a hull particularly for water buses for inland waters, characterized in that the centroid C B of the immersed volume is spaced from the centroid C F of the cross-section of the hull taken along the plane of the calm surface of the water, the centroid C B being located forward of the center of the waterplane, the hull having maximum immersions at the bow and maximum beam on waterline in the stern.
  • the hull has longitudinal lines, which substantially represent the flow lines of the water, that are highly smooth and therefore nearly straight.
  • a hull is considered which is used in particular in boats such as water buses for inland and lagoon waters.
  • V 3 was considered by assuming that it is reached with a margin of 5% of maximum available power
  • C B is the centroid of the immersed volume and that C F is the centroid of the cross-section of the hull taken along the plane of the sea surface, obviously when calm.
  • the vertical dimension of the hull is reduced at the stern and increased at the bow.
  • the shallowest inclination of the longitudinal cross-sections is provided in the stern region.
  • Another aspect that might be considered as an additional element of the characteristic that can be ascribed to the particular hull that can be produced arises from observing the midship cross-section of any hull (i.e., the transverse cross-section that has the greatest area), which is substantially U-shaped.
  • the conversion of the frames (transverse cross-sections) from the U-shape to the V-shape is one of the critical aspects of the shape of the bow.
  • the shape variation is provided by forming a so-called "shoulder", i.e., an unwanted shape discontinuity.
  • the immersed volume has been considered as a non-independent variable and an attempt has been made to render the waterlines (horizontal cross-sections) "substantially straight" in the bow region.
  • a prismatic coefficient CP that is a compromise among those deemed ideal at the lowest and highest speeds was chosen.
  • This value was determined experimentally, taking also into account the value of the ratio between the prismatic coefficients of the bow CP F and of the stern CP A .
  • the prismatic coefficient is one of the fineness coefficients of the hull.
  • CP F and CP A are understood as the levels of fullness of the bow alone and of the stern alone with respect to the central part of the hull.
  • centroid C F of the cross-section of said hull taken along the plane of the calm surface of the water also known as waterplane center or centroid of the center of flotation
  • centroid C B center of buoyancy
  • C F1 designates the centroid of the waterplane when the craft is not loaded and dry (immersion 1.150 m and displacement 37.566 T).
  • the reference sign C B2 instead designates the center of buoyancy and the reference sign C F2 designates the centroid of the center of flotation when the vessel is fully laden (immersion 1.397 m and displacement 54.820 T).
  • centroid of the cross-section of said hull taken along the plane of the calm surface of the water (also known as center of the waterplane) C F1 is set by the frame 20 at 11.882 m, and said centroid (center of buoyancy) C B1 is set by the frame 20 to 12.832 m and by the base line LC to 0.77 m.
  • the center of buoyancy C B2 is placed by the frame 20 at 12.398 m and by the base line LC at 0.927 m, and said centroid of the center of flotation C F2 is placed by the frame 20 at 10.972 m.
  • the described hull also allows to minimize the negative effects of the shallow waters in which the water bus moves and to achieve high safety, understood most of all as transverse stability, good maneuverability, tied to operation, optimum ease of steering, and low manufacturing and operating costs.
  • centroid C F of the section of said hull taken along the plane of the calm surface of the water also known as center of the waterplane
  • centroid C B center of buoyancy

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
EP03013410A 2002-06-25 2003-06-20 Rumpf für auf Binnengewässern fahrenden Schiffe Withdrawn EP1375336A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTV20020071 2002-06-25
ITTV20020071 ITTV20020071A1 (it) 2002-06-25 2002-06-25 Struttura di carena, particolarmente per vaporetti per acque interne e lagunari

Publications (1)

Publication Number Publication Date
EP1375336A1 true EP1375336A1 (de) 2004-01-02

Family

ID=29717165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03013410A Withdrawn EP1375336A1 (de) 2002-06-25 2003-06-20 Rumpf für auf Binnengewässern fahrenden Schiffe

Country Status (2)

Country Link
EP (1) EP1375336A1 (de)
IT (1) ITTV20020071A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE103483C (de) *
FR617228A (fr) * 1926-06-09 1927-02-16 Forme de carène de meilleure utilisation de la puissance du propulseur
GB355981A (en) * 1928-05-07 1931-09-03 Vladimir Yourkevitch Improvements in the form of ships' hulls
DE584128C (de) * 1931-07-26 1933-09-14 Ernst Schneider Schiffsform
DE1057486B (de) * 1956-09-11 1959-05-14 Petrus Jacobus Wigleven Verfahren zum Bau eines Bootes
US5711239A (en) * 1994-04-21 1998-01-27 Petroleum Geo-Services As Propeller configuration for sinusoidal waterline ships

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE103483C (de) *
FR617228A (fr) * 1926-06-09 1927-02-16 Forme de carène de meilleure utilisation de la puissance du propulseur
GB355981A (en) * 1928-05-07 1931-09-03 Vladimir Yourkevitch Improvements in the form of ships' hulls
DE584128C (de) * 1931-07-26 1933-09-14 Ernst Schneider Schiffsform
DE1057486B (de) * 1956-09-11 1959-05-14 Petrus Jacobus Wigleven Verfahren zum Bau eines Bootes
US5711239A (en) * 1994-04-21 1998-01-27 Petroleum Geo-Services As Propeller configuration for sinusoidal waterline ships

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"IN SEARCH OF LOW WASH HULL FORMS", SHIP AND BOAT INTERNATIONAL, ROYAL INSTITUTION OF NAVAL ARCHITECTS, LONDON, GB, no. 2, 1 March 1991 (1991-03-01), pages 8 - 11, XP000176972, ISSN: 0037-3834 *

Also Published As

Publication number Publication date
ITTV20020071A1 (it) 2003-12-29

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