WO2013162474A1 - Appendice de coque - Google Patents

Appendice de coque Download PDF

Info

Publication number
WO2013162474A1
WO2013162474A1 PCT/SG2013/000166 SG2013000166W WO2013162474A1 WO 2013162474 A1 WO2013162474 A1 WO 2013162474A1 SG 2013000166 W SG2013000166 W SG 2013000166W WO 2013162474 A1 WO2013162474 A1 WO 2013162474A1
Authority
WO
WIPO (PCT)
Prior art keywords
hull
bow
vessel
wave
ship
Prior art date
Application number
PCT/SG2013/000166
Other languages
English (en)
Inventor
Chanda SUBRATA
Original Assignee
Ngee Ann Polytechnic
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 Ngee Ann Polytechnic filed Critical Ngee Ann Polytechnic
Priority to SG11201406165XA priority Critical patent/SG11201406165XA/en
Publication of WO2013162474A1 publication Critical patent/WO2013162474A1/fr

Links

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
    • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
    • B63B1/40—Other means for varying the inherent hydrodynamic characteristics of hulls by diminishing wave resistance
    • 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 invention relates to a vessel and a hull appendage for a vessel.
  • the main sources of this resistance are (i) water pressure acting perpendicular to the hull and (ii) viscosity of water causing friction which is tangential to the hull surface.
  • the pressure acting on the surface of the moving hull mainly depends upon the waves created, by the ship, which leads to wave making resistance.
  • wave making resistance increases with increase in Froude Number. Rate of increase is higher at higher Froude Number.
  • the present invention proposes wing like appendages fitted on both sides of the bow of a ship. These wings are fitted above waterline. Optimum position and the angle of the wings with respect to the horizontal may depend on the hull form, draught and the Froude Number of the ship.
  • Embodiments may be implemented according to claims 2 to 6. BRIEF DESCRIPTION OF DRAWINGS
  • Figures 1a and 1b are orthographic views of the ship and the wings for a ship without bulbous bow;
  • Figures 2a and 2b are orthographic views of the ship and the wings for a ship with bulbous bow;
  • Figure 3 is a perspective view of each wing;
  • Figures 4a to 4c are orthographic views of the wing showing the tilting angle
  • Figure 5 is a side view of the ship showing the reduction in bow wave.
  • Figure 1 shows a vessel 100 having a hull 106, a bow 102, a design waterline 104 and a stern 108.
  • a pair of wing like appendages 101 is fitted on both sides of the hull 106 above the waterline 104 and near the bow 102.
  • Figure 2 shows a vessel 200 having a bow 202, a submerged bulbous bow 203, a design waterline 204 and a stem 206.
  • a pair of wings 201 is attached to the hull 206 above the waterline 204 and near the bow 202.
  • Figure 3 shows the wing 101 ,201 is more detail. It includes a lower surface 302, an upper surface 304 and a mounting 306.
  • the lower surface 302 of the wing may be similar to the face of an aerofoil.
  • the bow wave is forced up the bow hull surface as the vessel moves through the water until it encounters the lower surface 302.
  • the lower surface 302 thereby reduces the height to which the bow wave can reach, and therefore reduces the energy required to move the vessel through the water.
  • the bow wing 101 may represent a reduction in the integral of the bow wave projected over the hull surface, above the water line i.e. the bow wave profile.
  • the mounting 306 height should be chosen so that under normal operating conditions the bow wave is guided by the lower surface 302, and that the bow wave does not flow over the upper surface 304.
  • the mountings 306 are to be fitted close to the bow at a location to maximise the reduction in the overall bow wave height. Typically for most vessels the bow wave occurs in the first 15% of the waterline length.
  • the wings are fitted above design waterline.
  • the port and starboard wings are symmetric and may be fitted at an angle perpendicular to the hull surface.
  • the wings are tilted at angle 400 greater than or equal to 0° (The angle is positive when the wing is turned anticlockwise when viewed from starboard) with the even keel waterline as shown in Figure 4.
  • Optimum size, position and the angle made with the even keel waterline may depend upon the type of ship, weather conditions, amplitude and width of the wave, operating draught, hull form of the ship and the Froude Number at which the ship operates. For example they may be determined empirically using a towing tank experiment or simulated using Computational Fluid Dynamics(CFD).
  • CFD Computational Fluid Dynamics
  • the wings 101 are to be fitted in such a way that the wave does not go over the wings.
  • the shape of the wing towards the leading edge should be such that it does not cause the wave to break.
  • the wing will be gradually lowered towards the trailing edge to maximise hydrodynamic efficiency.
  • Reducing the bow wave 500 height helps to suppress the bow wave (compared to the original 502), resulting in a reduced wave profile at the bow end of the ship. This leads to reduction in resultant force in the direction of the stern due to pressure.
  • a hydrodynamic lift acts on the lower surface of the wings, which causes reduction in wetted surface area of the ship resulting in a further reduction in resistance.
  • increased trim will lead to increased length on waterline and hence reduce the effective Froude Number, which further reduces resistance. Effectively the bow wings may lead to a reduction in the bow wave profile.
  • optimised location, size and other parameters of the wing may be determined empirically using a towing tank experiment.
  • a model must be designed to be geometrically the same as the real ship. Then the Froude number of the real ship and the model must match i.e. this determines the water velocity in the tank.
  • V m speed of the model
  • the towing tank includes a load cell to monitor the total resistance on the model (R Tm )- This can be used for example:
  • the power for each configuration is thus compared to determine the lowest effective power required.
  • the upper 304 and lower 303 surface can be roll formed from same material as the hull of the ship, for example sheet steel, into the required aerofoil profile. This can then be welded to a frame including the mounting 306.
  • the mounting 306 can in turn be welded to the hull or fitted with a mechanism to allow its position and the angle with the waterline to be adjusted for optimum performance.
  • the mechanism may be controlled by the main ship navigation system, or a separate controller according to an algorithm.
  • the algorithm may adjust or retract the wing 101 for different loading conditions, wind speed, wind direction, wave height, wave direction, list and/or vessel speed.
  • the mechanism may take the form of hydraulic or electrical actuators.
  • Wings can be retrofitted to ships with no modification to the shape of the hull. It may only require modification of the forward structures. Additional side stringers and vertical stiffeners can be fitted along with fore peak bulkhead, side shell, frames, side longitudinal and other structures. Alternatively the wing may take the form of an integrated appendage or wave guide during ship building.
  • the wings can be fitted to container ships, passenger ship, naval ships, for example.

Landscapes

  • 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)

Abstract

Navire comprenant : une coque comportant une poupe, une proue et une ligne d'eau de conception, un appendice de coque fixé à la coque au-dessus de la ligne d'eau de conception, adjacent à la proue et conçu pour réduire la hauteur de vague de proue et/ou le profil de vague proue.
PCT/SG2013/000166 2012-04-25 2013-04-25 Appendice de coque WO2013162474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SG11201406165XA SG11201406165XA (en) 2012-04-25 2013-04-25 A hull appendage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG201203122 2012-04-25
SG201203122-5 2012-04-25

Publications (1)

Publication Number Publication Date
WO2013162474A1 true WO2013162474A1 (fr) 2013-10-31

Family

ID=49483602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2013/000166 WO2013162474A1 (fr) 2012-04-25 2013-04-25 Appendice de coque

Country Status (1)

Country Link
WO (1) WO2013162474A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9751593B2 (en) 2015-01-30 2017-09-05 Peter Van Diepen Wave piercing ship hull
US10017227B2 (en) 2016-12-13 2018-07-10 Naviform Consulting & Research Ltd. Minimum wave bow
CN114954824A (zh) * 2022-06-29 2022-08-30 中国人民解放军海军工程大学 一种适用于高速船舶的减阻减纵摇水翼附体装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04238788A (ja) * 1991-01-10 1992-08-26 Mitsui Zosen Akishima Kenkyusho:Kk 船舶の推力発生機構
JPH06321172A (ja) * 1992-08-31 1994-11-22 Mitsubishi Heavy Ind Ltd 高速横安定性船体構造
US5566634A (en) * 1995-02-22 1996-10-22 Petromanolakis; Emanuel E. Ship's stem duct with airfoil section
JP2004136780A (ja) * 2002-10-17 2004-05-13 National Maritime Research Institute 船体運動低減装置
US20110030607A1 (en) * 2009-08-10 2011-02-10 Ocke Mannerfelt Marine Vessel with Extendable and Retractable Surface Effect Wings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04238788A (ja) * 1991-01-10 1992-08-26 Mitsui Zosen Akishima Kenkyusho:Kk 船舶の推力発生機構
JPH06321172A (ja) * 1992-08-31 1994-11-22 Mitsubishi Heavy Ind Ltd 高速横安定性船体構造
US5566634A (en) * 1995-02-22 1996-10-22 Petromanolakis; Emanuel E. Ship's stem duct with airfoil section
JP2004136780A (ja) * 2002-10-17 2004-05-13 National Maritime Research Institute 船体運動低減装置
US20110030607A1 (en) * 2009-08-10 2011-02-10 Ocke Mannerfelt Marine Vessel with Extendable and Retractable Surface Effect Wings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9751593B2 (en) 2015-01-30 2017-09-05 Peter Van Diepen Wave piercing ship hull
US10017227B2 (en) 2016-12-13 2018-07-10 Naviform Consulting & Research Ltd. Minimum wave bow
CN114954824A (zh) * 2022-06-29 2022-08-30 中国人民解放军海军工程大学 一种适用于高速船舶的减阻减纵摇水翼附体装置
CN114954824B (zh) * 2022-06-29 2024-06-04 中国人民解放军海军工程大学 一种适用于高速船舶的减阻减纵摇水翼附体装置

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