EP2452869B1 - Unmanned underwater vehicle - Google Patents
Unmanned underwater vehicle Download PDFInfo
- Publication number
- EP2452869B1 EP2452869B1 EP10190895A EP10190895A EP2452869B1 EP 2452869 B1 EP2452869 B1 EP 2452869B1 EP 10190895 A EP10190895 A EP 10190895A EP 10190895 A EP10190895 A EP 10190895A EP 2452869 B1 EP2452869 B1 EP 2452869B1
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- EP
- European Patent Office
- Prior art keywords
- underwater vehicle
- hulls
- unmanned underwater
- vehicle according
- framework
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
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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
- B63B7/00—Collapsible, foldable, inflatable or like vessels
- B63B7/02—Collapsible, foldable, inflatable or like vessels comprising only rigid parts
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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
- B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
- B63B1/121—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls
- B63B2001/123—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls interconnected by a plurality of beams, or the like members only
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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
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/16—Arrangement of ship-based loading or unloading equipment for cargo or passengers of lifts or hoists
- B63B2027/165—Deployment or recovery of underwater vehicles using lifts or hoists
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
- B63G2008/002—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned
Definitions
- the invention relates to an unmanned underwater vehicle comprising two or more hulls and a framework coupling the hulls comprising a means for crane deployment and recovery.
- Unmanned underwater vehicles may be broadly devided into the subclasses of remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs). Whereas remotely operated vehicles are usually controlled by a connecting cable, autonomous underwater vehicles fulfill a mission without being constantly monitored by a human operator. However, unmanned underwater vehicles and in particular autonomous underwater vehicles are cost effective tools for carrying out a variety of tasks in the underwater environment, e.g. pipeline surveys and investigations or military tasks.
- ROVs remotely operated vehicles
- AVS autonomous underwater vehicles
- unmanned underwater vehicles and in particular autonomous underwater vehicles are cost effective tools for carrying out a variety of tasks in the underwater environment, e.g. pipeline surveys and investigations or military tasks.
- the two hulls of the known autonomous underwater vehicle are arranged adjacently and are coupled by a framework comprising an eye for crane deployment and recovery.
- a small AUV called “SeaBED” comprises two hulls connected by rigid spars.
- the two hulls are located in a vertical plane due to negative buoyancy in the lower hull and positive buoyancy in the upper hull.
- the vertical arrangement of the hulls makes the vehicle stable in pitch and roll.
- the known AUV comprises an eye to coact with the hook of a crane, wherein the eye as the means for crane deployment and recovery is attached to the upper hull. Therefore, the known AUV is launched and recovered in a vertical position. In the vertical position the AUV is particularly susceptible for the effects of wind and sea motion and cannot be launched or recovered under rough environmental conditions.
- US 2010/0269675 A1 discloses a system for disabling small water crafts, which comprises two hulls and an entanglement device that entangles the target, thereby disabling the target.
- the entanglement device is a stranded material coupled to the hulls, which is deployable by changing the distance of the hulls.
- the system provides two linkages, which are joined to a main hull and are capable of reconfiguring in order to change the separation distance between the hulls.
- This object is achieved by providing an unmanned underwater vehicle comprising two or more hulls and a framework coupling the hulls according to claim 1.
- a framework comprising at least one cross bar comprising two pivotable levers connected to each other by a main joint, allows to fold and unfold the unmanned underwater vehicle comprising the framework to keep the vehicle in a compact folded state during launch or recovery.
- the vehicle is carried by a crane, whereas the hulls remain adjacent to each other due to gravity.
- the weight of the dangling hulls takes effect downwards, i.e. in the opposite direction of the cranes holding force, generating torque in the cross bars and therefore rotation of the main joints to converge the hulls.
- the vehicle In the folded state the vehicle is much less fragile and therefore less sensitive for the dangerous effects of wind providing a safer manageability of the vehicle during launch or recovery operations. Furthermore, the vehicle is much more easy to store on deck of a support vessel in the folded and compact state. Moreover, the space needed for storing is reduced.
- the unmanned underwater vehicle After launching the vehicle starts its mission in an unfolded state, wherein the hulls are spreaded and located distantly.
- the unmanned underwater vehicle comprises two hulls arranged parallely, which can be located very compactly in the folded state and provide a large width being spreaded in the unfolded operating state.
- a large width of the vehicle is needed for special tasks like pipeline surveys, for example a width of 2,5 meters, to arrange coacting equipment like sonar equipment distanty to obtain improved operation results.
- the width of conventionally arranged underwater vehicles is limited by the accompanying fragility and sensitivity for wind effects, the foldable underwater vehicle provides an extendable width due to the possibility of being folded while being out of the water.
- each hull comprises multibeam sonar giving the opportunity to evaluate the results from the several sonars, for example by a central control unit in one of the hulls.
- the main joints of the cross bars are attached to the means for crane deployment and recovery to induce the holding force of the crane directly in the housings of the main joint enabling the joints to disband torque in the cross bars generated by the hull's weight.
- the hulls After releasing the vehicle and thus releasing the holding force of the crane the hulls are pushed apart from each other, spreading the levers of the cross bars, e.g. due to gravity of the framework and/or the hulls.
- the spreading of the levers of the cross bars can be supported by a spring acting on the cross bar(s) or other mechanisms involving positive and negative buoyancy elements.
- the main joint is located in the middle of the cross bar to enable a symmetrical folding and unfolding of the vehicle.
- the framework comprises two or more cross bars with the main joints attached to a longitudinal bar, wherein the longitudinal bar comprises the means for crane deployment and recovery, for example a hook or an eye to coact with a crane.
- the longitudinal bar comprises the means for crane deployment and recovery, for example a hook or an eye to coact with a crane.
- other detachable means for crane deployment and recovery but hooks may be comprised.
- An arrangement with a longitudinal bar provides a stable framework with symmetrical load on the main joints of the cross bars. Furthermore, the weight of the longitudinal bar, which is located in the centre of the space between two hulls, supports the spreading movement of the hulls after releasing the vehicle from the crane.
- the endings of the cross bar comprise auxiliary joints, which are attached to the hulls of the underwater vehicle.
- the levers of the cross bars coacting with auxiliary joints and main joints constitute a gear unit, which enables a smooth-running folding movement of the framework.
- the auxiliary joints as a part of the gear unit enable the hulls to remain in the orientation designated for the mission even during launching or recovering.
- the auxiliary joints assigned to the same hull are located in a common plane.
- the auxiliary joints provided on the starboard side of the vehicle are arranged in a common plane and similarly the auxiliary joints provided on the port side are arranged in a common plane.
- the location of the auxiliary joints in a common plane provides a symmetrically foldable framework, enabling the main joints of the cross bars to move on a longitudinal line between the common planes of the auxiliary joints during folding/unfolding events.
- the framework comprises cross bars in different parallel planes, wherein the cross bars located in a larger distance to the longitudinal bar than the other cross bars are attached to the longitudinal bar by means of struts.
- the struts transfer the force induced by the crane symmetrically to the auxiliary joints of the cross bars.
- the length of the struts ensures synchronized movements of the levers of the cross bars.
- the cross bars can be equipped with instruments or other equipment requiring an adjusted arrangement, e.g. magnetometers. The instruments are attached to two adjacent levers of different cross bars located in different distances with regard to the longitudinal bar and are therefore adjusted in any state of the spreadable levers.
- the framework provides one or more telescoping cross bars to reduce the dimension of the vehicle in the folded state, which is advantageous in storing the vehicle. Furthermore, the telescoping movement of the cross bars improve the coaction of the main joints and the auxiliary joints and adjusts the levers to obtain a smooth-running behaviour of the framework.
- the framework comprises a detachable locking mechanism, which is self-locking in an unfolded operating position of the unmanned underwater vehicle.
- the locking mechanism is unlocked and the vehicle is folded by the lifting movement of the crane.
- the folding of the vehicle after unlocking the mechanism and engaging the crane is supported by water resistance, as far as the vehicle stays below the surface before starting the recovery operation.
- the crane might be engaged to the vehicle by a diver.
- the foldable vehicle releases a lifting body, which hits the surface and can be grappled like a buoy.
- the lifting body or buoy is preferably part of the means for crane deployment and recovery and is attached to the longitudinal bar of the framework, for example by using a salvage rope.
- the locking mechanism can be unlocked by means provided in the vehicle.
- Another possibility to unlock the locking mechanism is a remote control or an unlocking by interference of the hook of a crane acting with the eye attached to the longitudinal bar of the framework.
- the hulls are constituted of modules to form assemblies of modules, each assembly comprising modules for example for propulsion, energy packages or power supplies, communication, payload and/or navigation.
- the modular design enables a low-cost construction of an unmanned underwater vehicle, especially an autonomous underwater vehicle, adapted to the special requirements of the designated mission.
- the vehicle is an autonomous underwater vehicle (AUV), which fulfills its missions without being monitored by a human operator.
- AUV provides expensive and sensitive equipment, which is protected by applying a foldable framework to launch and recover the AUV in a folded and compact state.
- Fig. 1, 2 and 3 depict an autonomous underwater vehicle (AUV) 1 with two parallely arranged hulls 2, 3, which are connected by a foldable framework 4.
- the hulls 2, 3 are tube-shaped and built as pressure housings containing the electronics, the batteries and other system-requirements of the AUV 1 like means for navigation or communication as well as a control unit (not shown).
- Each hull 2, 3 comprises a propulsion unit 5 comprising a propeller 6, fins 7 and side rudders 8.
- each hull 2, 3 comprises a multibeam sonar 9.
- the framework 4, which will be elucidated hereinafter, enables to fold or to crunch the AUV 1.
- the hulls 2, 3 are arranged adjacently.
- the unfolded state of the AUV 1 which is shown in fig. 3
- the hulls 2, 3 are arranged in distance to each other, i.e. apart from each other, wherein the framework 4 determines the space between the hulls 2, 3.
- the unfolded state which is the operating state of the AUV 1
- the hulls 2, 3 are spreaded providing a large width of the AUV 1.
- a large width of e.g. 2,5 meters is advantageous for a plurality of investigation tasks, for example surveying of pipelines 10.
- a pipeline 10 is monitored by the multibeam sonars 9 of both hulls 2, 3, wherein the sonar signals 11 are coordinated. Due to the spreading of the hulls 2, 3 the multibeam sonars 9 are able to send and receive sonar signals 11 in an advantageous angle in order to compute improved investigation results.
- the framework 4 comprises four cross bars 12, 13, 14, 15, comprising two pivotable levers 16, 17 connected to each other by a main joint 18, 19, 20, 21, respectively.
- the main joints 18, 19, 20, 21 are located in the centre, e.g. half of the length of the respective cross bar 12, 13, 14, 15, and build a hinge for rotation movement of the cross bars' levers 16, 17.
- the endings 22, 23 of the cross bars 12, 13, 14, 15 are attached to the hulls 2, 3 by auxiliary joints 24, 24', 25, 25', respectively.
- the main joints 18, 19, 20, 21 coacting with the auxiliary joints 24, 24', 25, 25' constitute a gear unit, which allows the hulls 2, 3 to move in a horizontal plane.
- the main joints 18, 19, 20, 21 are attached to a longitudinal bar 26.
- the longitudinal bar 26 only moves in a basically vertical plane, i.e. perpendicular to a plain containing the hulls 2, 3.
- the four cross bars 12, 13, 14, 15 are located in pairs in different planes, wherein the cross bars 13, 14 located in a larger distance from the longitudinal bar 26 than the other cross bars 12, 15 are attached to the longitudinal bar 26 by means of struts 27, 28.
- the cross bars 12, 15 located adjacent the longitudinal bar 26 are preferably attached directly to the longitudinal bar 26, i.e. without struts.
- the main joints 18, 19, 20, 21 of every cross bar 12, 13, 14, 15 is engaged with the common longitudinal bar 26, which comprises a means for crane deployment and recovery of the AUV 1.
- the means for crane deployment and recovery of the AUV 1 is an eye 29 rigidly attached to the longitudinal bar 26.
- a crane 30 Fig. 4, Fig. 5 .
- auxiliary joints 24, 24', 25, 25'assigned to the same hull 2, 3 are located in a common plane, e.g. the auxiliary joints 24, 24' dedicated to the hull 2 on the starboard side of the AUV 1 are located in a common plane and similarly the auxiliary joints 25, 25' dedicated to the hull 3 on the port side of the AUV 1 are located in a common plane.
- the levers 16, 17 of any cross bar have the same length, providing a central location of the main joints 18, 19, 20, 21 in a symmetrical arrangement and permitting the longitudinal bar 26 to move in the centre of the space between the hulls 2, 3.
- joint holders 31 are attached to the hulls 2, 3, which are arched to fit on the surfaces on the tube-shaped hulls 2, 3.
- the joint holders 31 provide a plane 32 to carry the respective auxiliary joints 24, 25 and fill the distance between the auxiliary joints and the arched surface of the hulls 2, 3.
- the pair of cross bars 12, 13 located adjacent to the bow 33 of the AUV 1 carries instruments 34 or other equipment of the AUV 1.
- the instruments 34 are longitudinally shaped and located on different levers 16, 17 of the cross bars 12, 13.
- Each of the instruments 34 are attached to both of the cross bars 12, 13 of the respective pair of cross bars by means of rotatable bearings 34a, 34b.
- the respective instrument 34 is attached to the foldable framework in different planes and adjusted in any state of the spreadable cross bars 12, 13.
- the bearings 34a, 34b enable the cross bars 12, 13 to transport the instruments 34 during the folding/unfolding movement of the AUV 1 and to locate them into operational position instantly after unfolding the AUV 1.
- the instruments 34 are sheltered by the adjecent cross bars.
- magnetometers are provided as instruments 34 being rotatably attached to a pair of cross bars.
- the AUV 1 comprises further instruments 34, e.g. magnetometers, attached to the hulls 2, 3, located at the bow 33 of the AUV 1.
- instruments 34 e.g. magnetometers
- Fig. 4 and Fig. 5 illustrate the launching of the AUV 1 which takes place with the aid of the crane 30 mounted on board a buoyant platform, which is e.g. a surface vessel 35.
- Fig. 4 and Fig. 5 depict the stern of the vessel 35 with the crane 30 located amidships. However, in other embodiments stern-launching may be provided or the crane is located e.g. at the bow of a vessel.
- the AUV 1 When the AUV 1 is craned overboard, the AUV 1 remains in the folded state with hulls 2, 3 located adjacently, i.e. side-by-side. In the folded state the effect of wind in combination with wave-induced movements of the vessel 35 on the dangling AUV 1 is reduced.
- Another advantage of the folded state of the AUV 1 is the reduction of the space needed on board the vessel 31 for storing the AUV 1.
- a cradle is provided on the deck of the vessel 35.
- the AUV 1 When the currently launched AUV 1 reaches the surfaces 36, the AUV 1 is released from the crane 30, which causes is spreading of the hulls 2, 3 shown in fig. 6.
- the longitudinal bar 26 moves downwards in direction of the arrow 37 due to gravity, pushing the hulls 2, 3 apart from each other due to the weight of the framework 4.
- the framework can comprise a spring (not shown), e.g. attached to one or all of the main joints 18.
- the interior of the hulls can be arranged in a way, that provides an asymmetrical disposition of buoyancy with regard to the perimeter of the hulls 2, 3, e.g.
- the framework 4 comprises a detachable locking mechanism, which is self-locking when reaching the unfolded operating position of the AUV 1.
- the locking mechanism is detached.
- the crane 30 lifts the longitudinal bar 26 converting the AUV 1 into the folded state.
- the hulls 2, 3 move towards one another enabling a safe recovery.
- the locking mechanism might be detachable autonomously by the AUV 1 at the end of the mission, for example when the AUV 1 approaches at the surface.
- the locking mechanism is combined with the eye 29 of the longitudinal bar 26 and is detachable by engaging the eye 29 e.g. through the hook of the crane 30.
- the locking of the locking mechanism can be released indirectly by means of buoys released from the AUV 1 and floating on the surface 36.
- the AUV 1 comprises buoyant bodies 41 providing positive buoyancy, which are located preferably amidships between the cross bars 12, 15.
- buoyant bodies are provided at other sections of the AUV 1 or the AUV comprises a single buoyant body.
- the buoyant bodies 41 comprise a foam material and act as buoys after being released from the AUV 1.
- the buoyant bodies 41 are attached to the eye 29 of the longitudinal bar 26, e.g. by using a salvage rope, enabling the crane 30 to detach the locking mechanism while lifting the AUV 1.
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Description
- The invention relates to an unmanned underwater vehicle comprising two or more hulls and a framework coupling the hulls comprising a means for crane deployment and recovery.
- Unmanned underwater vehicles may be broadly devided into the subclasses of remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs). Whereas remotely operated vehicles are usually controlled by a connecting cable, autonomous underwater vehicles fulfill a mission without being constantly monitored by a human operator. However, unmanned underwater vehicles and in particular autonomous underwater vehicles are cost effective tools for carrying out a variety of tasks in the underwater environment, e.g. pipeline surveys and investigations or military tasks.
- For deploying submersible vehicles from a platform, for example a surface vessel, cranes are used. Launch and recovery are the most dangerous operations of the entire mission of a submersible vehicle due to the levitation of the vehicle. For successful launch and recovery sea motion and wind velocity have to be taken in consideration due to their effects on the vessels movement especially in terms of roll and pitch movement. Damage to the submersible vehicle or the support platform is a significant risk factor as well as possible hazards to personnel involved in the manoeuvre.
- A known autonomous underwater vehicle (AUV) manufactured by the applicant, called "SeaOtter", is build up as a twin hull system with two tube-shaped hulls arranged in parallel containing different modules for propulsion, energy packages, communication, navigation and payload. The two hulls of the known autonomous underwater vehicle are arranged adjacently and are coupled by a framework comprising an eye for crane deployment and recovery.
- A small AUV called "SeaBED" comprises two hulls connected by rigid spars. When the AUV is on duty the two hulls are located in a vertical plane due to negative buoyancy in the lower hull and positive buoyancy in the upper hull. The vertical arrangement of the hulls makes the vehicle stable in pitch and roll. The known AUV comprises an eye to coact with the hook of a crane, wherein the eye as the means for crane deployment and recovery is attached to the upper hull. Therefore, the known AUV is launched and recovered in a vertical position. In the vertical position the AUV is particularly susceptible for the effects of wind and sea motion and cannot be launched or recovered under rough environmental conditions.
- In view of the above, it is therefore an object of the present invention to provide a small, but efficient unmanned underwater vehicle, which can be launched or recovered safely and easily.
-
US 2010/0269675 A1 discloses a system for disabling small water crafts, which comprises two hulls and an entanglement device that entangles the target, thereby disabling the target. The entanglement device is a stranded material coupled to the hulls, which is deployable by changing the distance of the hulls. The system provides two linkages, which are joined to a main hull and are capable of reconfiguring in order to change the separation distance between the hulls. - This object is achieved by providing an unmanned underwater vehicle comprising two or more hulls and a framework coupling the hulls according to
claim 1. - A framework comprising at least one cross bar comprising two pivotable levers connected to each other by a main joint, allows to fold and unfold the unmanned underwater vehicle comprising the framework to keep the vehicle in a compact folded state during launch or recovery. During launch or recovery of the vehicle the vehicle is carried by a crane, whereas the hulls remain adjacent to each other due to gravity. Thus, during crane engagement the weight of the dangling hulls takes effect downwards, i.e. in the opposite direction of the cranes holding force, generating torque in the cross bars and therefore rotation of the main joints to converge the hulls.
- In the folded state the vehicle is much less fragile and therefore less sensitive for the dangerous effects of wind providing a safer manageability of the vehicle during launch or recovery operations. Furthermore, the vehicle is much more easy to store on deck of a support vessel in the folded and compact state. Moreover, the space needed for storing is reduced.
- After launching the vehicle starts its mission in an unfolded state, wherein the hulls are spreaded and located distantly. In a preferred embodiment the unmanned underwater vehicle comprises two hulls arranged parallely, which can be located very compactly in the folded state and provide a large width being spreaded in the unfolded operating state.
- A large width of the vehicle is needed for special tasks like pipeline surveys, for example a width of 2,5 meters, to arrange coacting equipment like sonar equipment distanty to obtain improved operation results. Though the width of conventionally arranged underwater vehicles is limited by the accompanying fragility and sensitivity for wind effects, the foldable underwater vehicle provides an extendable width due to the possibility of being folded while being out of the water.
- However, the distance of the hulls in the unfolded state improve the effectiveness of coacting equipment provided in different hulls, for example sonar equipment. Preferably, each hull comprises multibeam sonar giving the opportunity to evaluate the results from the several sonars, for example by a central control unit in one of the hulls.
- The main joints of the cross bars are attached to the means for crane deployment and recovery to induce the holding force of the crane directly in the housings of the main joint enabling the joints to disband torque in the cross bars generated by the hull's weight.
- After releasing the vehicle and thus releasing the holding force of the crane the hulls are pushed apart from each other, spreading the levers of the cross bars, e.g. due to gravity of the framework and/or the hulls. The spreading of the levers of the cross bars can be supported by a spring acting on the cross bar(s) or other mechanisms involving positive and negative buoyancy elements. Preferably, the main joint is located in the middle of the cross bar to enable a symmetrical folding and unfolding of the vehicle.
- In a preferred embodiment of the invention the framework comprises two or more cross bars with the main joints attached to a longitudinal bar, wherein the longitudinal bar comprises the means for crane deployment and recovery, for example a hook or an eye to coact with a crane. However, other detachable means for crane deployment and recovery but hooks may be comprised.
- An arrangement with a longitudinal bar provides a stable framework with symmetrical load on the main joints of the cross bars. Furthermore, the weight of the longitudinal bar, which is located in the centre of the space between two hulls, supports the spreading movement of the hulls after releasing the vehicle from the crane.
- Preferably, the endings of the cross bar comprise auxiliary joints, which are attached to the hulls of the underwater vehicle. The levers of the cross bars coacting with auxiliary joints and main joints constitute a gear unit, which enables a smooth-running folding movement of the framework. Moreover, the auxiliary joints as a part of the gear unit enable the hulls to remain in the orientation designated for the mission even during launching or recovering.
- To provide a pivoting moveability of each lever, the auxiliary joints assigned to the same hull are located in a common plane. Thus, the auxiliary joints provided on the starboard side of the vehicle are arranged in a common plane and similarly the auxiliary joints provided on the port side are arranged in a common plane. In a preferred embodiment with the main joints located at half of the length of the cross bars, the location of the auxiliary joints in a common plane provides a symmetrically foldable framework, enabling the main joints of the cross bars to move on a longitudinal line between the common planes of the auxiliary joints during folding/unfolding events.
- To increase the stability of the unmanned underwater vehicle the framework comprises cross bars in different parallel planes, wherein the cross bars located in a larger distance to the longitudinal bar than the other cross bars are attached to the longitudinal bar by means of struts. During launch or recovery of the vehicle the struts transfer the force induced by the crane symmetrically to the auxiliary joints of the cross bars. The length of the struts ensures synchronized movements of the levers of the cross bars. Moreover, in an embodiment with cross bars in different parallel planes providing auxiliary joints assigned to the same hull being located in a common plane, the cross bars can be equipped with instruments or other equipment requiring an adjusted arrangement, e.g. magnetometers. The instruments are attached to two adjacent levers of different cross bars located in different distances with regard to the longitudinal bar and are therefore adjusted in any state of the spreadable levers.
- In a preferred embodiment the framework provides one or more telescoping cross bars to reduce the dimension of the vehicle in the folded state, which is advantageous in storing the vehicle. Furthermore, the telescoping movement of the cross bars improve the coaction of the main joints and the auxiliary joints and adjusts the levers to obtain a smooth-running behaviour of the framework.
- The framework comprises a detachable locking mechanism, which is self-locking in an unfolded operating position of the unmanned underwater vehicle. When the vehicle is to be recovered, the locking mechanism is unlocked and the vehicle is folded by the lifting movement of the crane. The folding of the vehicle after unlocking the mechanism and engaging the crane is supported by water resistance, as far as the vehicle stays below the surface before starting the recovery operation. The crane might be engaged to the vehicle by a diver. Preferably, to initiate recovery the foldable vehicle releases a lifting body, which hits the surface and can be grappled like a buoy. The lifting body or buoy is preferably part of the means for crane deployment and recovery and is attached to the longitudinal bar of the framework, for example by using a salvage rope.
- However, the locking mechanism can be unlocked by means provided in the vehicle. Another possibility to unlock the locking mechanism is a remote control or an unlocking by interference of the hook of a crane acting with the eye attached to the longitudinal bar of the framework.
- In a preferred embodiment the hulls are constituted of modules to form assemblies of modules, each assembly comprising modules for example for propulsion, energy packages or power supplies, communication, payload and/or navigation. The modular design enables a low-cost construction of an unmanned underwater vehicle, especially an autonomous underwater vehicle, adapted to the special requirements of the designated mission.
- Preferably, the vehicle is an autonomous underwater vehicle (AUV), which fulfills its missions without being monitored by a human operator. An AUV provides expensive and sensitive equipment, which is protected by applying a foldable framework to launch and recover the AUV in a folded and compact state.
- Further advantageous embodiments and developments are defined in the dependent claims. These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter with reference to the accompanying drawings, in which:
- Fig. 1
- depicts a side view of an autonomous underwater vehicle according to an embodiment of the present invention;
- Fig. 2
- depicts a top view of the autonomous underwater vehicle shown in
fig. 1 ; - Fig. 3
- depicts a perspective view of an autonomous underwater vehicle according to
fig. 1 or 2 in an unfolded state; - Fig. 4 and Fig. 5
- depict schematic views of a vessel deploying an autonomous underwater vehicle.
- In the following description of an advantageous embodiment similar reference numeral is used for similar features.
-
Fig. 1, 2 and3 depict an autonomous underwater vehicle (AUV) 1 with two parallely arrangedhulls foldable framework 4. Thehulls AUV 1 like means for navigation or communication as well as a control unit (not shown). Eachhull propulsion unit 5 comprising a propeller 6,fins 7 andside rudders 8. Furthermore, eachhull multibeam sonar 9. - The
framework 4, which will be elucidated hereinafter, enables to fold or to crunch theAUV 1. In the folded state, which is shown infig. 1 and 2 , thehulls AUV 1, which is shown infig. 3 , thehulls framework 4 determines the space between thehulls AUV 1, thehulls AUV 1. A large width of e.g. 2,5 meters is advantageous for a plurality of investigation tasks, for example surveying ofpipelines 10. InFig. 3 apipeline 10 is monitored by themultibeam sonars 9 of bothhulls hulls multibeam sonars 9 are able to send and receivesonar signals 11 in an advantageous angle in order to compute improved investigation results. - The
framework 4 comprises fourcross bars pivotable levers - The
main joints respective cross bar levers endings hulls auxiliary joints main joints auxiliary joints hulls - The
main joints longitudinal bar 26. During the folding operation thelongitudinal bar 26 only moves in a basically vertical plane, i.e. perpendicular to a plain containing thehulls - The four
cross bars longitudinal bar 26 than the other cross bars 12, 15 are attached to thelongitudinal bar 26 by means ofstruts longitudinal bar 26 are preferably attached directly to thelongitudinal bar 26, i.e. without struts. In this arrangement themain joints cross bar longitudinal bar 26, which comprises a means for crane deployment and recovery of theAUV 1. - In the embodiment shown in
fig. 1, 2 ,3 the means for crane deployment and recovery of theAUV 1 is aneye 29 rigidly attached to thelongitudinal bar 26. During launching and recovering thelongitudinal bar 26 is hooked by a crane 30 (Fig. 4, Fig. 5 ). - The
auxiliary joints same hull auxiliary joints 24, 24' dedicated to thehull 2 on the starboard side of theAUV 1 are located in a common plane and similarly theauxiliary joints 25, 25' dedicated to thehull 3 on the port side of theAUV 1 are located in a common plane. In a preferred embodiment as depicted inFig. 3 thelevers main joints longitudinal bar 26 to move in the centre of the space between thehulls auxiliary joints 24, 24' assigned to thestarboard hull 2 in a common plane and simililarly to arrange theauxiliary joints 25, 25' assigned to the port sidedhull 2 in a common plane,joint holders 31 are attached to thehulls hulls joint holders 31 provide aplane 32 to carry the respectiveauxiliary joints hulls - The pair of cross bars 12, 13 located adjacent to the
bow 33 of theAUV 1 carriesinstruments 34 or other equipment of theAUV 1. Theinstruments 34 are longitudinally shaped and located ondifferent levers instruments 34 are attached to both of the cross bars 12, 13 of the respective pair of cross bars by means ofrotatable bearings respective instrument 34 is attached to the foldable framework in different planes and adjusted in any state of the spreadable cross bars 12, 13. However, thebearings instruments 34 during the folding/unfolding movement of theAUV 1 and to locate them into operational position instantly after unfolding theAUV 1. In the folded state of theAUV 1 theinstruments 34 are sheltered by the adjecent cross bars. In a preferred embodiment of theAUV 1 magnetometers are provided asinstruments 34 being rotatably attached to a pair of cross bars. - Moreover, the
AUV 1 comprisesfurther instruments 34, e.g. magnetometers, attached to thehulls bow 33 of theAUV 1. -
Fig. 4 and Fig. 5 illustrate the launching of theAUV 1 which takes place with the aid of thecrane 30 mounted on board a buoyant platform, which is e.g. asurface vessel 35.Fig. 4 and Fig. 5 depict the stern of thevessel 35 with thecrane 30 located amidships. However, in other embodiments stern-launching may be provided or the crane is located e.g. at the bow of a vessel. - When the
AUV 1 is craned overboard, theAUV 1 remains in the folded state withhulls vessel 35 on thedangling AUV 1 is reduced. Another advantage of the folded state of theAUV 1 is the reduction of the space needed on board thevessel 31 for storing theAUV 1. For storing the AUV 1 a cradle is provided on the deck of thevessel 35. - When the currently launched
AUV 1 reaches thesurfaces 36, theAUV 1 is released from thecrane 30, which causes is spreading of thehulls crane 30 thelongitudinal bar 26 moves downwards in direction of thearrow 37 due to gravity, pushing thehulls framework 4. To support the spreading movement appropriate to thearrow 38 the framework can comprise a spring (not shown), e.g. attached to one or all of themain joints 18. Furthermore, to support the spreading movement, the interior of the hulls can be arranged in a way, that provides an asymmetrical disposition of buoyancy with regard to the perimeter of thehulls negative buoyancy 39 in the upper half of therespective hull positive buoyancy 40 in the lower half of thehulls hulls negative buoyancy 39 in the upper half of therespective hull positive buoyancy 40 in the lower half of thehulls hulls hulls - The
framework 4 comprises a detachable locking mechanism, which is self-locking when reaching the unfolded operating position of theAUV 1. At the end of a mission, when the AUV is going to be recovered to thevessel 31, the locking mechanism is detached. After the crane being engaged with theAUV 1, thecrane 30 lifts thelongitudinal bar 26 converting theAUV 1 into the folded state. When thelongitudinal bar 26 is being lifted by the crane, thehulls - However, the locking mechanism might be detachable autonomously by the
AUV 1 at the end of the mission, for example when theAUV 1 approaches at the surface. In another embodiment the locking mechanism is combined with theeye 29 of thelongitudinal bar 26 and is detachable by engaging theeye 29 e.g. through the hook of thecrane 30. The locking of the locking mechanism can be released indirectly by means of buoys released from theAUV 1 and floating on thesurface 36. Thus, as depicted infig. 3 , theAUV 1 comprisesbuoyant bodies 41 providing positive buoyancy, which are located preferably amidships between the cross bars 12, 15. However, in other embodiments buoyant bodies are provided at other sections of theAUV 1 or the AUV comprises a single buoyant body. Thebuoyant bodies 41 comprise a foam material and act as buoys after being released from theAUV 1. Thebuoyant bodies 41 are attached to theeye 29 of thelongitudinal bar 26, e.g. by using a salvage rope, enabling thecrane 30 to detach the locking mechanism while lifting theAUV 1. - All the features of an unmanned underwater vehicle or its framework mentioned in the description and the claims are to be considered as disclosed individually as well as in any combination of any of these features.
Claims (12)
- Unmanned underwater vehicle comprising two or more hulls (2, 3) and a framework (4) coupling the hulls (2, 3), wherein the framework (4) comprises a means for crane deployment and recovery,
characterised in that
the framework (4) comprises at least one cross bar (12, 13, 14, 15) connected to the hulls (2, 3) at its endings (22, 23), said cross bar (12, 13, 14, 15) comprising two pivotable levers (16, 17) connected to each other by a main joint (18, 19, 20, 21), wherein the main joint (18, 19, 20, 21) of the cross bar (12, 13, 14, 15) is attached to the means for crane deployment and recovery. - Unmanned underwater vehicle according to claim 1,
characterized in that
the main joint (18, 19, 20, 21) is located in the centre of the cross bar (12, 13, 14, 15). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized by
two or more cross bars (12, 13, 14, 15) with their main joints (18, 19, 20, 21) attached to a longitudinal bar (26), wherein said longitudinal bar (26) comprises the means for crane deployment and recovery. - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the endings (22, 23) of the cross bar (12, 13, 14, 15) comprise auxiliary joints (24, 24', 25, 25'), which are attached to the hulls (2, 3) of the unmanned underwater vehicle. - Unmanned underwater vehicle according to claim 4,
characterized in that
the auxiliary joints (24, 24', 25, 25') assigned to the same hull (2, 3) are located in a common plane. - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the framework (4) comprises cross bars (12, 13, 14, 15) in different parallel planes, wherein the cross bars (13, 14) located in a larger distance from the longitudinal bar (26) than the other cross bars (12, 15) are attached to the longitudinal bar (26) by means of struts (27, 28). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized by
telescoping cross bars (12, 13, 14, 15). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the framework (4) comprises a detachable locking mechanism, which is engaged in an unfolded operating position of the framework (4). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
each hull (2, 3) comprises a multibeam sonar (9), - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the means for crane deployment and recovery is an eye (29) attached to the longitudinal bar (26). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the vehicle is an autonomous underwater vehicle (1). - Unmanned underwater vehicle according to any of the proceeding claims,
characterized in that
the hulls (2, 3) are assemblies of modules comprising modules for propulsion, energy packages or power supplies, communication, payload and/or navigation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10190895A EP2452869B1 (en) | 2010-11-11 | 2010-11-11 | Unmanned underwater vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP10190895A EP2452869B1 (en) | 2010-11-11 | 2010-11-11 | Unmanned underwater vehicle |
Publications (2)
Publication Number | Publication Date |
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EP2452869A1 EP2452869A1 (en) | 2012-05-16 |
EP2452869B1 true EP2452869B1 (en) | 2013-01-02 |
Family
ID=43919949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10190895A Not-in-force EP2452869B1 (en) | 2010-11-11 | 2010-11-11 | Unmanned underwater vehicle |
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EP (1) | EP2452869B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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IL228662B (en) * | 2013-10-01 | 2019-09-26 | Israel Aerospace Ind Ltd | Launch and recovery system and method |
US20190112006A1 (en) * | 2016-03-31 | 2019-04-18 | Derek Whitaker | Shapeshifting multi-mode personal watercraft |
CN108791736B (en) * | 2018-08-09 | 2023-10-20 | 华南理工大学广州学院 | Hull structure of water surface cleaning ship |
TR202016711A1 (en) * | 2020-10-20 | 2022-05-23 | Dokuz Eyluel Ueniversitesi Rektoerluegue | AN UNDERWATER VEHICLE |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1286624A (en) * | 1960-08-12 | 1962-03-09 | Improvements to submersible vehicles | |
US3943875A (en) * | 1973-03-05 | 1976-03-16 | British Columbia Research Council | Method and apparatus for launching and recovering submersibles |
US4718368A (en) * | 1983-11-11 | 1988-01-12 | Ings Terry C | Submersible water craft |
US4841896A (en) * | 1988-04-26 | 1989-06-27 | Fury Tommy J | Beach submarine |
FR2887224B1 (en) * | 2005-06-16 | 2008-10-17 | Julien Apeloig | MULTIMILIED EQUIPMENT |
US8256336B2 (en) * | 2009-04-28 | 2012-09-04 | Lockheed Martin Corporation | System for disabling small water craft |
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2010
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