WO2000030930A1 - Energy absorbing structures - Google Patents
Energy absorbing structures Download PDFInfo
- Publication number
- WO2000030930A1 WO2000030930A1 PCT/GB1999/003840 GB9903840W WO0030930A1 WO 2000030930 A1 WO2000030930 A1 WO 2000030930A1 GB 9903840 W GB9903840 W GB 9903840W WO 0030930 A1 WO0030930 A1 WO 0030930A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hull
- energy absorbing
- ship
- skin
- skins
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/16—Shells
- B63B3/20—Shells of double type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/082—Arrangements for minimizing pollution by accidents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
- B63B43/18—Improving safety of vessels, e.g. damage control, not otherwise provided for preventing collision or grounding; reducing collision damage
Definitions
- This invention relates to the field of mechanical structures designed to withstand deformations, and more particularly, but not exclusively, to the field of ship hull protection.
- PCT Publication No. WO 94/26585 describes a method and device for the installation of a double hull protection system providing increased energy absorption characteristics via the utilisation of trusslike members arranged so as to provide support to the auxiliary hull shell.
- the provision of this type of energy absorbing structure requires a complex geometric arrangement of structural support members within the void created between the inner and outer hulls, and therefore can add significant penalties in terms of both weight and design complication thereby resulting in a potentially reduced load carrying capability and increased build and maintenance costs.
- the object of our invention is to provide a method and apparatus to improve the energy absorption characteristics of multiple hull designed ships, utilising the mechanical characteristics of state of the art hull design with the addition of novel inter-skin void filling energy absorbing members.
- a multiple hull for a ship designed to reduced structural deformations and damage associated with impact or pressure loading applied to the outer hull of said ship
- said multiple hull comprising at least two hull skins, said hull skins being maintained in a spaced apart relationship by a plurality of bulk head means thereby describing voids, said voids between said hull skins being substantially filled with energy absorbing element means, said energy absorbing element means being so designed as to deform in response to impact or pressure loading
- Figure 1 shows a diagrammatic representation of a twin hull ship design
- Figure 2 shows a representation of section A-A as denoted in Figure 1 ,
- Figure 3 shows a representation of a section of inter-hull void filled with energy absorbing material in accordance with the invention.
- Figures 4a to 4b show a diagrammatic representation of ships hull in accordance with the invention undergoing stages of progressive deformation
- a ship hull assembly comprising an outer hull skin 2, an inner hull skin 3, and a representative number of transverse bulkheads 4 to providing structural support to the inner and outer hulls, 3, 2
- Figure 2 shows section A-A ( Figure 1 ) indicating the relative locations of the outer hull 2 and inner hull 3 to the ships deck level 6 along with the positioning of the ship centre line longitudinal bulkhead member 7 Additionally, the relative locations of the outer skin 2 and inner skin 3 provide for a void 5 as shown Figure 3 shows a representative area of void 5 between the outer and inner skins 2, 3 filled with spherical energy absorbing elements 8
- FIG. 5a shows the double skinned hull 2, 3 in its normal operating configuration, with the void 5 filled with energy absorbing elements
- a design in accordance with the invention will comprise a tough strong outer skin 2 forming the outer shape of the ship 1 This itself absorbing some levels of energy and resisting deformation and tearing thereby maintaining buoyancy
- the transverse watertight bulkheads 4 are required to be tough and compliant to provide support to the outer skin along with void 8 sub-division, thereby locating and retaining the buoyant energy absorption elements within localised areas of the void 8 and permitting the outer skin to deform whilst minimising strain levels
- the inner skin 3 is required to be made tough and structurally stiff to help contain the buoyant energy absorption elements and to resist their movement forming a watertight boundary
- buoyant energy absorption elements The key characteristics of the buoyant energy absorption elements is that they will deform at forces just below those which will apply large local deformities to the outer skin, or large deformations to the inner skin whilst remaining buoyant
- the energy elements may be preferably metallic or alternatively be constructed using other materials, including composites, which exhibit the required properties
- the outer and inner skins 2, 3 will be separated by large distances depending on the size of the impact loading or deformation to be resisted
- the spaces between the inner and outer skins 3, 2 and pairs of bulkheads 4 will be substantially filled with buoyant energy absorbing elements, and either part flooded with water or bound in a suitable matrix
- Figures 4a to 4e show a typical sequence of events surrounding impact type deformable damage to the hull of a ship having a design in accordance with the invention, where the element of the hull subjected to the loading is below the water line.
- Figure 4a shows the initial shape of a section of the hull 1 comprising both outer and inner skins 2, 3 a centre line longitudinal bulkhead 7 and a representative section of inter-skin void 5 containing energy absorbing elements 8.
- the loading the outer hull skin 2 produces a small deformation of the skin 10 along with deformation of some energy absorbing elements in the vicinity of the impact or explosion 11.
- the inner skin 3 sees virtually no loading, due to the energy absorption characteristics of both the outer skin 2 and the deforming energy absorption elements 8 in the localised region 11.
- Figure 4c shows the next stage in the deformation characteristics of the hull design, the outer skin 2 being heavily deformed over an increased region 12 and accordingly an increased number of energy absorption elements 8 become deformed thereby absorbing an increasing amount of deformation energy throughout the region 12.
- the inner skin 3 begins to see load transmitted from the deformed region 12 by the compression of the energy absorption elements contained between the two skins and therefore begins to deform accordingly over an initial area 13.
- Figure 4d shows a further advanced stage of ships hull deformation wherein the outer skin 2 is now deformed over an increased region 14 resulting in rupture of said skin 15 and an associated increasing number of energy absorbing elements being substantially deformed thereby absorbing an increasing amount of deformation energy.
- the inner skin 3 deforms over a larger region 16 seeing load transmitted by the energy absorption elements contained between the two regions 14, 16.
- the final figure in the sequence, Figure 4e shows the whole deformation at a very advanced state, wherein the outer skin 2 is deformed over a region 17, this outer skin 2 containing significant ruptures 19 resulting in the subsequent inability of the outer skin 2 to provide any further mechanical deflection resistance.
- the energy absorbing elements 8 contained within the region bounded by the outer skin 17 and inner skin deformation 18 would at this stage have absorbed substantially all of the energy possible, and therefore will be transmitting any further deflection energy directly to the inner skin 3 over said region 18.
- the design of the inner skin 3 is such that the mechanical toughness and stiffness characteristics are such that the skin 2 should contain the buoyant energy absorbing elements and delay as far as possible penetration or rupture of the skin 2 which would compromise the function of the inner watertight boundary.
- the energy absorbing characteristics of the invention can easily be applied to other structures which may be subject to impact or pressure loading, including but not limited to aircraft and motor vehicles.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Environmental & Geological Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU11706/00A AU1170600A (en) | 1998-11-20 | 1999-11-17 | Energy absorbing structures |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9825317.2 | 1998-11-20 | ||
GBGB9825317.2A GB9825317D0 (en) | 1998-11-20 | 1998-11-20 | Energy absorbing structures |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000030930A1 true WO2000030930A1 (en) | 2000-06-02 |
Family
ID=10842678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/003840 WO2000030930A1 (en) | 1998-11-20 | 1999-11-17 | Energy absorbing structures |
Country Status (4)
Country | Link |
---|---|
AR (1) | AR021317A1 (en) |
AU (1) | AU1170600A (en) |
GB (1) | GB9825317D0 (en) |
WO (1) | WO2000030930A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2386866A (en) * | 2002-03-26 | 2003-10-01 | Gibbs Int Tech Ltd | Marine craft with impact absorbing means |
NL1020696C2 (en) * | 2002-05-28 | 2003-12-01 | Tno | Device for protecting against underwater shock. |
US6770374B1 (en) | 1998-06-05 | 2004-08-03 | Basf Aktiengesellschaft | Composite elements containing compact polyisocyanate polyaddition products |
US6790537B1 (en) | 1999-03-30 | 2004-09-14 | Basf Aktiengesellschaft | Composite elements containing polyisocyanate-polyaddition products |
EP1614619A1 (en) * | 2004-07-09 | 2006-01-11 | Modus Marine Safety BV i.o. | Impact absorbing part of a ship |
WO2006005556A1 (en) * | 2004-07-09 | 2006-01-19 | Modus Marine Safety B.V.I.O. | Impact absorbing part of a ship |
US7223457B1 (en) | 1999-11-04 | 2007-05-29 | Basf Aktiengesellschaft | Composite elements |
FR2894931A1 (en) * | 2005-12-16 | 2007-06-22 | Mediterranee Const Ind | Buoyant apparatus for e.g. ship, has shell with reinforcement which is sized for housing anti-impact lining, and base combining with shell to form assembly with continuous outer surface, where lining has skin and structural part |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2405590A (en) * | 1940-03-08 | 1946-08-13 | Bell Telephone Labor Inc | Detonation shield |
DE2462128A1 (en) * | 1974-01-07 | 1976-02-05 | Toyo Kohan Co Ltd | Hollow thin-walled metal spheres - produced by dropping fused metal particles into fluid tank |
WO1994026585A1 (en) | 1993-05-18 | 1994-11-24 | Special Projects Research Corp. | Method and device for the installation of double hull protection |
US5379711A (en) * | 1992-09-30 | 1995-01-10 | The United States Of America As Represented By The Secretary Of The Navy | Retrofittable monolithic box beam composite hull system |
DE4432234A1 (en) * | 1994-09-10 | 1996-05-30 | Friedrich Koch | Protective double walled hull for oil tanker and similar ships |
US5613460A (en) * | 1994-08-31 | 1997-03-25 | Newport News Shipbuilding And Dry Dock Company | Submersible vessel external load mounting system |
EP0799764A1 (en) * | 1996-04-01 | 1997-10-08 | Schelde Maritiem B.V. | Tube construction with adjoining layers of tubes |
US5803004A (en) * | 1996-11-06 | 1998-09-08 | Emerson & Cuming, Composite Materials, Inc. | Marine vessel construction |
US5862772A (en) * | 1996-12-26 | 1999-01-26 | Emerson & Cumingcomposite Materials, Inc. | Damage control materials for warship construction |
-
1998
- 1998-11-20 GB GBGB9825317.2A patent/GB9825317D0/en not_active Ceased
-
1999
- 1999-11-17 WO PCT/GB1999/003840 patent/WO2000030930A1/en active Application Filing
- 1999-11-17 AU AU11706/00A patent/AU1170600A/en not_active Abandoned
- 1999-11-18 AR ARP990105867 patent/AR021317A1/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2405590A (en) * | 1940-03-08 | 1946-08-13 | Bell Telephone Labor Inc | Detonation shield |
DE2462128A1 (en) * | 1974-01-07 | 1976-02-05 | Toyo Kohan Co Ltd | Hollow thin-walled metal spheres - produced by dropping fused metal particles into fluid tank |
US5379711A (en) * | 1992-09-30 | 1995-01-10 | The United States Of America As Represented By The Secretary Of The Navy | Retrofittable monolithic box beam composite hull system |
WO1994026585A1 (en) | 1993-05-18 | 1994-11-24 | Special Projects Research Corp. | Method and device for the installation of double hull protection |
US5613460A (en) * | 1994-08-31 | 1997-03-25 | Newport News Shipbuilding And Dry Dock Company | Submersible vessel external load mounting system |
DE4432234A1 (en) * | 1994-09-10 | 1996-05-30 | Friedrich Koch | Protective double walled hull for oil tanker and similar ships |
EP0799764A1 (en) * | 1996-04-01 | 1997-10-08 | Schelde Maritiem B.V. | Tube construction with adjoining layers of tubes |
US5803004A (en) * | 1996-11-06 | 1998-09-08 | Emerson & Cuming, Composite Materials, Inc. | Marine vessel construction |
US5862772A (en) * | 1996-12-26 | 1999-01-26 | Emerson & Cumingcomposite Materials, Inc. | Damage control materials for warship construction |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6770374B1 (en) | 1998-06-05 | 2004-08-03 | Basf Aktiengesellschaft | Composite elements containing compact polyisocyanate polyaddition products |
US6790537B1 (en) | 1999-03-30 | 2004-09-14 | Basf Aktiengesellschaft | Composite elements containing polyisocyanate-polyaddition products |
US7223457B1 (en) | 1999-11-04 | 2007-05-29 | Basf Aktiengesellschaft | Composite elements |
GB2386866A (en) * | 2002-03-26 | 2003-10-01 | Gibbs Int Tech Ltd | Marine craft with impact absorbing means |
GB2386866B (en) * | 2002-03-26 | 2005-08-24 | Gibbs Int Tech Ltd | Marine craft with impact absorbing means |
NL1020696C2 (en) * | 2002-05-28 | 2003-12-01 | Tno | Device for protecting against underwater shock. |
WO2003099648A1 (en) * | 2002-05-28 | 2003-12-04 | Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno | Underwater shock protection device |
EP1614619A1 (en) * | 2004-07-09 | 2006-01-11 | Modus Marine Safety BV i.o. | Impact absorbing part of a ship |
WO2006005556A1 (en) * | 2004-07-09 | 2006-01-19 | Modus Marine Safety B.V.I.O. | Impact absorbing part of a ship |
FR2894931A1 (en) * | 2005-12-16 | 2007-06-22 | Mediterranee Const Ind | Buoyant apparatus for e.g. ship, has shell with reinforcement which is sized for housing anti-impact lining, and base combining with shell to form assembly with continuous outer surface, where lining has skin and structural part |
WO2007080248A1 (en) | 2005-12-16 | 2007-07-19 | Constructions Industrielles De La Mediterranee - Cnim | Floating vessel comprising a collision-resistant hull |
Also Published As
Publication number | Publication date |
---|---|
AR021317A1 (en) | 2002-07-17 |
GB9825317D0 (en) | 1999-01-13 |
AU1170600A (en) | 2000-06-13 |
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