EP2896589A1 - Verfahren und Vorrichtung - Google Patents

Verfahren und Vorrichtung Download PDF

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Publication number
EP2896589A1
EP2896589A1 EP14151662.5A EP14151662A EP2896589A1 EP 2896589 A1 EP2896589 A1 EP 2896589A1 EP 14151662 A EP14151662 A EP 14151662A EP 2896589 A1 EP2896589 A1 EP 2896589A1
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EP
European Patent Office
Prior art keywords
load
hoisting
cable
hoisting cable
force
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
EP14151662.5A
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English (en)
French (fr)
Other versions
EP2896589B1 (de
Inventor
Tilo Klappenbach
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.)
SAL HEAVY LIFT GMBH
SAL OFFSHORE B.V.
Original Assignee
SAL Offshore BV
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 SAL Offshore BV filed Critical SAL Offshore BV
Priority to DK14151662.5T priority Critical patent/DK2896589T3/en
Priority to EP14151662.5A priority patent/EP2896589B1/de
Publication of EP2896589A1 publication Critical patent/EP2896589A1/de
Application granted granted Critical
Publication of EP2896589B1 publication Critical patent/EP2896589B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
    • B66C13/063—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/02—Devices for facilitating retrieval of floating objects, e.g. for recovering crafts from water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/52—Floating cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B66D1/52—Control devices automatic for varying rope or cable tension, e.g. when recovering craft from water
    • B66D1/525—Control devices automatic for varying rope or cable tension, e.g. when recovering craft from water electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes

Definitions

  • the present disclosure relates to compensation of variations in movement and/or force of a load, in particular of a load suspended from a movable or moving hoisting system, such as in floating vessels.
  • Heave compensation systems for hoisting systems that are moving, e.g. being located on a moving object are well known and they may be divided in two general types: passive heave compensation relying on spring devices, which may provide energy dissipation, and active heave compensation relying on measurements, active feedback and operating units.
  • passive and active heave compensation are combined. Such combinations may be divided in three general types.
  • a first type causes or affects movement of (part of) the hoisting device, e.g. see EP 228050 and WO 2012/039623 . This, however complicates construction of the hoisting system and it can transform heave motion in vertical direction into motion in a lateral direction.
  • a second type combines passive and active actuation of hydraulic systems, e.g. see US 3912227 , US 4121806 , US 4215851 , WO 2004/067435 , DE 102005058952 , WO 2007/145503 , EP 2029423 , WO 2012/161565 , CN 202429940 U , CN 102556875 .
  • Such systems tend to be complex and require strong hydraulic pumps and/or bulky conduits and reservoirs for the hydraulic fluid. Further, the effective achievable stroke of such systems is determined by the length of the hydraulic cylinders.
  • a third type comprises systems wherein the effective length of the hoisting cable is adjusted by reeling in and/or paying out the hoisting cable, e.g. see WO 83/03815 , US 6595494 , US 2005/0179021 , WO 2008/022125 , US 7798471 , WO 2009/120062 , US 2009/0232625 , WO 2009/036456 , US 8297597 , WO 2011/034422 , CN 101948002 , CN 102398856 , WO 2012/112039 , CN 202499677 U , CN 202643158 U , CN 202829415 U .
  • a method for compensation movements and/or force variations of a load in particular of a load suspended from a movable or moving structure, more in particular a load suspended from a floating vessel, comprising the steps of:
  • the spring excursion amplitude, and therewith the position of the load with respect to the first hoisting cable, in particular with respect to the movable or moving structure is adjustable by adjustment of the second cable providing adjustment of the second lifting force and/or length of the second hoisting cable, in particular by adjustment thereof with respect to the first lifting force.
  • This increases control over the position and/or movement of the suspended load and reaction forces on the lifting cables and associated apparel caused by such movement.
  • the active heave compensation needs to accommodate only part of the load weight, with the passive heave compensation accounting for another portion of the load weight; in order to compensate part of the spring force, or rather to compensate motion of the first lifting cable such as by movement of the structure from which the load is suspended, the second lifting force may be only a small fraction of the first lifting force.
  • the second lifting force need not (be sufficient to) carry the full weight of the load for raising the load from the stationary position; the bulk being supported by the first hoisting cable with the associated spring force.
  • the second lifting force need only be a small fraction of the first lifting force to provide still a significant deviation from the equilibrium position and affect the position of the load with respect to the structure from which the load is suspended by the first and second lifting cables.
  • the method facilitates accurate and detailed control over the position of a heavy load with comparatively small adjustment forces. Adjustment of the position of the load by adjustment of the first lifting force is possible, in which case both lifting forces may be adjusted together.
  • the tension force in the second hoisting cable is varied by varying the length of the second hoisting cable, which therefore automatically transfers load to/from the first hoisting cable from/to the second hoisting cable.
  • the second lifting force may be less than about 25% of the first lifting force, in particular less than about 15% such as less than about 10%, e.g. about 5% of the first lifting force.
  • the present method obviates active heave compensation methods acting on a single hoisting cable (main hoisting cable) which generally is heavy, relatively stiff and moreover, bears all the weight of the load.
  • the present method allows active heave compensation with a comparatively much smaller and lighter-weight system, and the first cable can be adjusted under less than full load. It therefore suffers less wear than an actively adjusted hoisting cable.
  • the first cable may have a smaller cable diameter reducing wear when travelling over sheaves with a reasonable diameter.
  • the step of controlling a position and/or movement of the load by compensating at least part of the spring force by adjusting the second lifting force and/or a length of the second hoisting cable comprises adjusting a hoisting length of the second hoisting cable as a function of a variation in a hoisting length of the first cable, e.g. by taking in or paying out cable length together in different rates.
  • a hoisting length refers to the effective distance along the cable that an object can be displaced with the cable, e.g. a (free) hanging section of a crane cable. In case part of the cable would run forth and back plural times between the load and the object as in a sheaving system, the hoisting length is accordingly less than the actual length of cable involved.
  • the sum of both the first and second lifting forces may be kept substantially constant so as not to accelerate the load and maintain a predetermined position of the load.
  • the first and second lifting forces may be controlled based on monitoring tension forces in the respective cables, e.g. via one or more force feedback systems in a winch, and/or based on monitoring (variations in) the actual position and/or movement of the load.
  • the word “cable” refers to any form of a suitable flexible thin elongated component that can carry sufficient load for carrying out the required respective part of the method such as a rope, wire, cord, wire bundle, fibre rope, ribbon, chain, tether (e.g. steel rod tether) and/or combinations thereof.
  • the spring force may be provided by one or more of a pneumatic system, a pneumohydraulic system, a hydraulic system, a constant tension winch, a mechanical spring system e.g. having a reversibly deformable portion, and the like, which may at least partly be configured to provide a generally relatively low spring stiffness.
  • the spring force may also be derived from elastic deformation of (at least part of) the first hoisting cable itself.
  • a constant tension winch as referred to above can control the tension in a line run off the winch; it is used to achieve a constant line-pull set by an operator, e.g. a pneumatically and/or hydraulically controlled tension winch.
  • the line-pull can be measured by a sensor, e.g. a load cell, and monitored by a control system. If the actual value of the line-pull differs from a pre-set value the winch will pay in or pay out the line to maintain the pre-set value. Adjustment of the cable tension may be possible by changing the tension set point value, e.g. by setting a constant reference pressure in the pneumatic and/or hydraulic system.
  • the step of controlling a position and/or movement of the load comprises varying the second lifting force and/or a length of the second hoisting cable as a function of at least one of a position and a movement of the suspended load with respect to a reference, in particular as a function of a deviation from the reference.
  • the second lifting force allows active control of the position, force and/or movement of the load with respect to the reference, e.g. for active heave compensation against motion of a support and maintaining the load stationary with respect to the earth or a moving vessel.
  • the spring force of the first lifting force provides passive compensation of the force and/or movement of the load, e.g. for passive heave compensation.
  • active and passive heave compensation are arranged in parallel, rather than in series. The system is readily adjustable by direct control over the second cable within the maximum amplitude of the spring excursion without the need to adjust the first cable.
  • the reference comprises at least one of a stationary point on the earth, a position of the load, a movement of the load, a tension force of the first hoisting cable, a spring force of the first hoisting cable, a spring excursion, the first lifting force of the first hoisting cable, the second lifting force and/or a tension force of the second hoisting cable.
  • the reference position and/or movement of the load may (also) comprise one or more intended positions and/or movements of the load.
  • the position and/or movement of the load may be predetermined with respect to at least part of a remote stationary or moving object, e.g. a target position on a quay or aboard a floating vessel or a part of the hoisting system itself in particular a point on a (vessel's) crane such as the crane tip.
  • this facilitates correcting the position and/or movement of the load for manoeuvring the load and/or placing a load in a desired position, reducing force variations on the first and/or the second hoisting cable and/or associated equipment.
  • An important purpose of the active heave compensation is to minimise relative motions between a hoisted object and a platform (foundation, moving vessel) the object is to land on, with as a final objective to reduce acceleration and impact on both the hoisted object and the platform.
  • plural references may be used either selectively, in succession and/or together, e.g. to define a bounded multidimensional parameter space in which the position and/or movement of the load is, should be and/or can be controlled.
  • the step of compensating at least part of the spring force by adjusting the second lifting force and/or a length of the second hoisting cable may be automated, e.g. comprising use of a sensor for sensing a position and/or movement of the load with respect to a reference, e.g. a suspending structure or a platform onto which the load is to be placed, and using a controller controlling at least one of a position and a movement of the suspended load based on one or more signals of the sensor. This allows executing the method generally faster and more reliably than with a human operator adjusting the second lifting force.
  • the method may comprise adjusting the first and second hoisting cables substantially simultaneously, e.g. paying out and/or taking in the respective cables. This facilitates controlled movement of the load.
  • the adjustment of the first and second hoisting cables need not be at an equal rate or speed, so as to adjust the first and second lifting forces with respect to each other.
  • the spring force and/or the spring stiffness may be adjustable, e.g. in dependence of the lifting capacity of the second hoisting cable.
  • the spring force and the second lifting force may be adjusted to the weight and/or other aspects of the load, e.g. size and shape of the load, deformability of (parts of) the load, drag on the load by air and/or water, etc.
  • At least part of the load may be submerged in water, in particular sea water.
  • the reference may comprise (part of) a sea bed and/or a structure on a sea bed.
  • a (partly) submerged load experiences significant hydrodynamic forces such as drag and/or fluid inertia, commonly known as "added mass”.
  • Providing a spring force to the first hoisting cable provides passive heave compensation and can sometimes - depending on the shape etc. of the structure - effectively compensate for most wave motion, e.g. created, for instance, by roll, pitch, heave etc.
  • the active heave compensation system as presently provided by the second hoisting cable allows to control (residual) movements and/or forces of the load with respect to moving water and/or or a moving support structure, in particular a vessel on the water and conversely with respect to the (stationary) environment such as (structures on) the sea bed.
  • the present method is particularly effective in air, where the effect of drag on the load and/or added mass inertia, and hence activation of the passive heave compensator in the first hoisting wire, is minimal.
  • the method comprises using two cables from one hoisting device, e.g. a crane or winch assembly, as first and second hoisting cables, respectively.
  • one crane may carry most of the weight of the load with a first cable, e.g. the main hoisting cable, and compensate at least part of the spring force provided by (the heave compensation of) the main hoisting cable by employing an auxiliary cable of the same crane and adjusting the second lifting force provided by that auxiliary cable. This increases ease and/or reliability of manipulation of the first and second hoisting cables with respect to each other.
  • first and second hoisting cables may readily extend generally parallel to each other and engage the load close to each other, so that forces applied with one of the hoisting cables can relatively directly affect forces in the other one of the hoisting cables.
  • An embodiment comprises lifting the load with two or more hoisting systems, each hoisting system comprising at least a first and a second hoisting cable, respectively, and the method comprising connecting each of the respective first and a second hoisting cables to the load, and performing the method according to any one of the preceding claims with each of the hoisting systems connected to the load, wherein in particular at least one of the respective hoisting systems is operated in a slave mode to the another one of the respective hoisting systems.
  • a large load may be hoisted with two or more cranes, each of which employing the method described herein. This facilitates manipulation of the load.
  • the method provided herewith may also facilitate supporting relatively heavy loads with relatively small or light-weight hoisting devices.
  • the apparatus comprises a first hoisting cable and a second hoisting cable.
  • the first hoisting cable is connectable to a load and the second hoisting cable is connectable to the load.
  • the first hoisting cable is configured to provide, at least when connected with the load, a lifting force including a spring force, e.g. the first hoisting cable being elastic and/or operably connected with a spring device.
  • the second hoisting cable in particular the hoisting length and/or lifting force thereof, is adjustable relative to the first hoisting cable, at least when connected with the load for compensating at least part of the spring force by adjusting the second lifting force.
  • the apparatus comprises a sensor configured to detect at least one of the position and/or movement of the load with respect to a reference and wherein the second cable is operably connected with a controller which in turn is connected with the sensor and is configured to adjust the second hoisting cable in response to one or more signals from the sensor.
  • first hoisting cable is connectable to the load in a first connection
  • second hoisting cable is connectable to the load in the first connection and/or a second connection near the first connection.
  • first and second cables engage the load close to each other and forces applied with one of the hoisting cables can relatively directly affect forces in the other one of the hoisting cables.
  • the reference may comprise at least one of the group comprising a predetermined position of the load, a movement of the load, a tension force of the first hoisting cable, a spring force of the first hoisting cable, the first lifting force of the first hoisting cable, the second lifting force and/or a tension force of the second hoisting cable and wherein in particular the position and/or movement of the load are predetermined with respect to at least part of a remote stationary or moving object, e.g. a target position on a floating vessel for placement of the load.
  • a remote stationary or moving object e.g. a target position on a floating vessel for placement of the load.
  • the apparatus may comprise one hoisting device, e.g. a crane, providing both the first and second hoisting cables.
  • the first cable may be a main hoisting cable and the second cable may be an auxiliary cable.
  • the apparatus is configured for being itself at least partly suspended from a hoisting system, e.g. a crane, and in turn suspending the load with respect to a base, e.g. at least one of the first and second hoisting cables extending between the base and the load.
  • a hoisting system e.g. a crane
  • the apparatus and the load may be movably attached together to form an integrated assembly, wherein the apparatus may comprise a power source and/or a connection to an external power source such as a remote operated vehicle.
  • Such apparatus can be used suspended from a hoisting cable and thus employed, which allows reaching great depths with the load while benefiting from the present concepts.
  • a benefit from suspending the apparatus from a hoisting system instead of the other way around is that a more direct control over the position and/or movement of the load may be achieved if no cable is positioned between the compensation apparatus and the load.
  • the system may, e.g., be realised with (i) a main hoisting wire from above sea level to a first depth, say, 1,600 m deep. (ii) a beam complete with hoisting system at the first depth. (iii) the load being suspended beneath the beam with (iv) a main lift wire complete with passive heave compensation (forming the first hoisting cable) and (v) an additional lifting wire of which the length can be controlled (forming the second hoisting cable).
  • the beam is at the first depth and the load at a second depth, below the first depth, say, 1,620 m.
  • the first cable running between the beam and the load can be a, possibly passively heave compensated, fixed pennant or hoisting wire with high stiffness.
  • a vessel comprising at least one apparatus as described herein.
  • Such vessel exhibits improved heave compensation with respect to simplicity, costs and/or weight.
  • the vessel comprises one or more, e.g. two, hoisting systems with first and second hoisting cables, e.g. cranes and wherein the vessel is configured to lift the load with two or more of the hoisting systems each performing the method as described herein.
  • Fig. 1 indicates as an exemplary embodiment an offshore vessel 1 floating on a body of water W and being provided with a crane 3 having a mast 5 and a boom 7.
  • a load 9 is suspended from (the boom 7 of) the crane 3 via a first hoisting cable 11 and a second hoisting cable 13.
  • the load 9 may be placed on a target position on a fixed object 15 such as a platform fixed to the seabed. Note that in other cases the target position may be on a movable object, e.g. a floating vessel, and/or may be submerged.
  • the first hoisting cable 11, or main wire has a connector 12 determining a first hoisting length L11 from the crane down.
  • the first hoisting cable 11 is connected with the load 9 through a spring element 17 suspended from the main wire 11, and, here, a sling 19, together spanning a length LS.
  • the first hoisting length L11 is adjustable, e.g. by reeling in and/or paying out the cable 11 from a first winch 21.
  • the second hoisting cable 13, or auxiliary wire, is connected to the load 9 without intervening spring element and determines a second hoisting length L13 from the crane down.
  • the second hoisting length L13 is adjustable, e.g. reeling in and/or paying out the cable 13 from a controllable second winch 23.
  • the second hoisting cable 13 may be connected with the load 9 at the same point(s) as the first hoisting cable 11 and any intervening structure (spring device, sling, etc.) or at one or more different connection points.
  • the first and second hoisting cables 11, 13 may hang from the crane boom 7 at equal or different heights, e.g. using sheaves running on a common or on different axles.
  • the suspension length L9 and the second hoisting length L13 may be equal or different.
  • the stiffness of the spring element e.g. a spring constant, should be selected such that the load 9 is suspended within the dynamic range of the spring and the length LS is variable.
  • the first hoisting cable 11 exerts a first lifting force on the load including a spring force due to the spring element 17 and the total suspension length L9 is variable while the first hoisting length L11 is constant.
  • the load 9 may move up and down with respect to (the boom 7 of) the crane 3 without adjustment of the first hoisting cable 11.
  • the spring stiffness determines the spring force on the load 9 and excursions of the load 9 from an initial position, i.e. the length LS and variations thereof.
  • the possible length variation of LS (and hence L9) is determined by a maximum excursion amplitude allowed by the spring element 17.
  • the spring element 17 typically may take the form of one or more hydraulic cylinder-piston assemblies coupled with an at least partly gas-filled volume 25.
  • the pressure in the hydraulic assembly may be adjusted and an equilibrium piston position may be determined, and thus an equilibrium position of the load 9 with respect to the connector 12, such that equal up-and downward spring excursions SE and corresponding variations in LS are possible.
  • the suspension length L9 and the first hoisting length L11 would be equal, e.g. in case the spring force would be derived from elasticity of the cable itself, from a constant tension winch and/or from a movable crane element.
  • the second hoisting cable 13 is provided and connected with the load 9 in parallel to the first hoisting cable 11.
  • the second hoisting cable 13 may exert a lifting force on the load 9, taking over part of the weight of the load 9 from the first lifting cable 11 and the spring element 17, (partly) relaxing the spring element 17 and reducing the spring force and reducing the length LS.
  • the spring force of the spring element 17, or rather the spring force component of the first lifting force is at least partly compensated.
  • the lengths L9 and LS may be varied separate from variations of the length L11. Since gravity and other forces acting on the load 9, e.g. accelerations due to wave motion, are supported primarily by the first hoisting cable 11 and the spring element 17, such variations of the length LS can be realised with a relatively small second hoisting force by the second hoisting cable 13, depending on the stiffness of the spring element 17.
  • the second cable 13 may hang loose and inoperative if not required, therewith not affecting the passive heave compensation.
  • the active heave compensation system provided by the second hoisting cable 13 in principle does not add mass to the total load suspended from the first hoisting cable 11.
  • a number of optional motion and/or position sensors 27, 29, 31, 33 are provided and (here: wirelessly) connected with a controller 35.
  • the position and/or movement of (the hull of) the vessel 1, the (tip of the) crane boom 7, the load 9 and the platform 15 may be determined with respect to each other, and/or with respect to one or more particular sensors and thus may define one or more reference positions for positioning and/or moving the load 9.
  • a separation S of the load 9 from (a target position on the object 15) may be determined and used for controlling a position and/or movement of the load 9, e.g. through comparison of the (relative) positions of the sensors 29 and 31, e.g. for smoothly placing or lifting the load 9 onto/from the platform 15.
  • More, less and/or differently arranged and/or differently arranged and/or connected sensors may be provided, e.g. a sensor monitoring piston movements in a cylinder of a hydraulic spring element.
  • the controller 35 is connected to the second winch 23 and optionally to the first winch 21 so that, in response to one or more signals from one or more sensors 27-33 the position and/or movement of the load 9 may be automatically controlled by adjustment of the first and/or second winches 21, 23.
  • placing the load 9 onto the (stationary) platform 15 with a moving floating vessel 1 may comprise lowering the load 9 by concurrent extension of the first and second hoisting cables 11, 13 but at different velocities, such that the second hoisting cable 13 exerts an increasing lifting force and compensates reducing variation in length LS.
  • the effect of the extension of the first hoisting cable 11 is reduced by adjustment of the second hoisting cable 13 and the load 9 nears the platform 15 at lower velocity than by lowering the load 9 with the first hoisting cable 11 alone.
  • the separation of the load 9 and the platform 15 may then be controlled to accurate degree by relative adjustment of the first and second hoisting cables 11, 13 by the controller 35 in dependence of signals from the sensors 29 and 31, e.g. providing separation data, and possibly from the sensor 27 providing data on movement of the hoisting structure3.
  • the second hoisting cable 13 may quickly be extended relative to the first hoisting cable 11 and further wave motion of the vessel 1 and/or any deformation of the crane 5 may be compensated by the spring element 17 until the first hoisting cable 11 is also extended and the load 9 is securely placed.
  • Figs. 2-5 show further embodiments.
  • Fig. 2 shows an embodiment which may be understood as an inverse of the embodiment shown in Fig. 1 : here, a crane 5 is arranged on a stationary object 15 such as a platform and provides the first and second hoisting cables 11, 13, for together hoisting a load 9 in accordance with the aforegoing.
  • the first hoisting cable 11 is provided with a spring element 17 and the second hoisting cable 13 is adjustable for compensating the spring force of the spring element 17.
  • the crane 5 can transfer the 9 load onto (or from) a vessel 1 floating on a body of water W, wherein adjustment of the first and second cables 11, 13 may be used to control the position and/or movement of the load 9 so as to compensate wave-induced motion of the vessel 1 according to the explanations supra.
  • the vessel 1 and load 9 are provided with sensors 33, 29, respectively, connected with a controller 35 for controlling operation of the crane and adjustment of the first and second hoisting cables 11, 13, so that position and/or movement of the load 9 may be controlled with respect to the position and/or movement of (the sensor 33 of) the vessel 1, taking the latter as a reference rather than the stationary crane 5.
  • Fig. 3 indicates a vessel 1 with a first crane 5A and a second crane 5B.
  • the first hoisting cable 11 connects the first crane 5A with the load 9 (which here is submerged in the body of water W) and the second hoisting cable 11 connects the second crane 5B with the load 9.
  • the first and second hoisting cables 11, 13 may be adjusted independently.
  • Such system may be preferred in case the first hoisting cable 11 is provided with a passive heave compensation system realised by deformation of at least part of the first crane 5A and / or cable 11. Further, such system facilitates modifying and/or retrofitting of an existing hoisting system with passive heave compensation.
  • one or more winches and/or capstans may be used.
  • Fig. 4 indicates a vessel 100 comprising two cranes 5M and 5S respectively, for dual crane operation wherein both cranes together hoist a load.
  • the load is suspended from each crane by respective first and second hoisting cables 11, 13.
  • passive and active heave compensation can be performed in parallel as explained hereinbefore by appropriately adjusting the respective first and/or second hoisting cables 11, 13 with respect to each other.
  • one of the cranes e.g. 5S
  • Fig. 5 indicates an embodiment of an apparatus 110 which is itself suspended from a crane 5 by a hoisting cable 111.
  • the apparatus 110 comprises a base 50 and the load 9 is suspended from the base 50 by first and second hoisting cables 11, 13 extending from (a respective winch 21, 23 on) the base 50 to the load 9.
  • the first cable 11 is connected to a constant tension winch 21 with adjustable offset tension by an adjustable spring element 117.
  • the second hoisting cable 13 is connected to a winch 23 which may be controlled to reel in or pay out the second hoisting cable 13 by a controller 135 on the basis of one or more signals from one or more sensors (not shown) on the load 9, the vessel 1, the base 50, the spring element 117 and/or a portion of the sea bed.
  • the invention is not restricted to the above described embodiments which can be varied in a number of ways within the scope of the claims.
  • the load hanging from two cranes, each of which providing a respective "first hoisting cable” and to have one second hoisting cable to the load, in particular engaging the load at or near a position above the centre of gravity of the load, e.g. between the cranes.
  • the second hoisting cable may run from one of the cranes or from another hoisting support e.g. a winch. This enables active heave compensation of the load in a dual crane operation with a simplified setup compared to Fig. 4 .
  • the second lifting force may include a second spring force, e.g. with the method comprising providing the second hoisting cable with a second spring force, in particular being higher than (e.g. due to a stiffer spring) or at least distinct from the first spring force.
  • the second hoisting cable may also be subject to passive compensation of forces and/or movements such as passive heave compensation.
  • Such second spring force and/or its spring stiffness may be adjustable, e.g. in dependence of the lifting capacity of the second hoisting cable.
  • Existing hoisting systems may comprise plural hoisting cables; the present method can increase their operational flexibility for which (controllers of) such hoisting systems may be modified to provide an apparatus as provided herewith.
  • Various aspects of the presently provided method may be implemented as a program product for use with a computer system, in particular a computer system for controlling adjustment of the first and/or second cable(s) of an apparatus as described herein, where the program(s) of the program product define functions of the embodiments (including the methods described herein).
  • the program(s) can be contained on a variety of non-transitory computer-readable storage media, where, as used herein, the expression "non-transitory computer readable storage media" comprises all computer-readable media, with the sole exception being a transitory, propagating signal.
  • the program(s) can be contained on a variety of transitory computer-readable storage media.
  • Illustrative computer-readable storage media include, but are not limited to: (i) non-writable storage media (e.g., read-only memory devices within a computer such as CD-ROM disks readable by a CD-ROM drive, ROM chips or any type of solid-state nonvolatile semiconductor memory) on which information is permanently stored; and (ii) writable storage media (e.g., flash memory, floppy disks within a diskette drive or hard-disk drive or any type of solid-state random-access semiconductor memory) on which alterable information is stored.
  • non-writable storage media e.g., read-only memory devices within a computer such as CD-ROM disks readable by a CD-ROM drive, ROM chips or any type of solid-state nonvolatile semiconductor memory
  • writable storage media e.g., flash memory, floppy disks within a diskette drive or hard-disk drive or any type of solid-state random-access semiconductor memory

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
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EP3165493A1 (de) * 2015-11-06 2017-05-10 Fundación Tecnalia Research & Innovation Vorrichtung und verfahren zur positionierung und ausrichtung einer last
CN106875815A (zh) * 2017-03-23 2017-06-20 上海海事大学 一种主动式波浪补偿模拟实验系统平台
WO2017146591A2 (en) 2016-02-22 2017-08-31 Safelink As Mobile active heave compensator
NO20160756A1 (en) * 2016-05-04 2017-11-06 Safelink As Semi active heave compensator
WO2017146590A3 (en) * 2016-02-22 2017-11-16 Safelink As Mobile heave compensator for subsea environment
DE102017206595A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
DE102017206590A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
DE102017206591A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
WO2019074364A1 (en) * 2017-10-12 2019-04-18 Heerema Marine Contractors Nederland Se SYSTEM FOR ARRANGING A WIND TURBINE ASSEMBLY ON A SUPPORT STRUCTURE
JP2020513383A (ja) * 2016-12-06 2020-05-14 イーテーエルエーセー・ベー・フェー 沖合船舶、船舶における使用のための波によって誘発される運動を補償するクレーン、および積荷運搬方法
EP3653561A1 (de) * 2018-11-13 2020-05-20 NHLO Holding B.V. (hub)ausgleichsvorrichtung, hubsystem, verfahren zum heben und teilesatz zum federausgleich eines hubsystems
DE102019104807A1 (de) * 2019-02-26 2020-08-27 Fipa Holding Gmbh Vakuum-hebevorrichtung
WO2020204719A1 (en) * 2019-04-05 2020-10-08 Itrec B.V. Heave compensated dual hoist crane
EP3869034A1 (de) * 2020-02-19 2021-08-25 Siemens Gamesa Renewable Energy A/S System und verfahren zur montage oder demontage einer windturbine
CN113697688A (zh) * 2021-08-16 2021-11-26 中际联合（北京）科技股份有限公司 用于船舶货物的装卸设备、补偿方法及其装置和海上平台

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EP3165493A1 (de) * 2015-11-06 2017-05-10 Fundación Tecnalia Research & Innovation Vorrichtung und verfahren zur positionierung und ausrichtung einer last
EP3420177A4 (de) * 2016-02-22 2019-10-23 Safelink AS Aktiver mobiler hubkompensator für unterseeische umgebung
WO2017146591A2 (en) 2016-02-22 2017-08-31 Safelink As Mobile active heave compensator
WO2017146591A3 (en) * 2016-02-22 2017-11-02 Safelink As Active mobile heave compensator for subsea environment
WO2017146590A3 (en) * 2016-02-22 2017-11-16 Safelink As Mobile heave compensator for subsea environment
AU2017222997B2 (en) * 2016-02-22 2022-10-20 Safelink As Mobile Active Heave Compensator
US11111113B2 (en) 2016-02-22 2021-09-07 Safelink As Mobile passive and active heave compensator
EP3420176A4 (de) * 2016-02-22 2019-10-30 Safelink AS Mobiler hubkompensator für unterseeische umgebung
NO347979B1 (en) * 2016-05-04 2024-06-03 Safelink Ahc As Semi active heave compensator
NO20160756A1 (en) * 2016-05-04 2017-11-06 Safelink As Semi active heave compensator
DE102017206590A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
DE102017206591A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
DE102017206595A1 (de) 2016-08-30 2018-03-01 Robert Bosch Gmbh Einrichtung zum Heben, Senken oder Halten einer Last
EP3290384A1 (de) 2016-08-30 2018-03-07 Robert Bosch GmbH Einrichtung zum heben, senken oder halten einer last
EP3290382A1 (de) 2016-08-30 2018-03-07 Robert Bosch GmbH Einrichtung zum heben, senken oder halten einer last
EP3290383A1 (de) 2016-08-30 2018-03-07 Robert Bosch GmbH Einrichtung zum heben, senken oder halten einer last
JP2020513383A (ja) * 2016-12-06 2020-05-14 イーテーエルエーセー・ベー・フェー 沖合船舶、船舶における使用のための波によって誘発される運動を補償するクレーン、および積荷運搬方法
CN106875815A (zh) * 2017-03-23 2017-06-20 上海海事大学 一种主动式波浪补偿模拟实验系统平台
WO2019074364A1 (en) * 2017-10-12 2019-04-18 Heerema Marine Contractors Nederland Se SYSTEM FOR ARRANGING A WIND TURBINE ASSEMBLY ON A SUPPORT STRUCTURE
KR20200094135A (ko) * 2017-10-12 2020-08-06 히레마 마린 컨트랙터스 네덜란드 에스이 지지 구조물의 풍력 터빈 조립체를 배치하는 시스템
US11572866B2 (en) 2017-10-12 2023-02-07 Heerema Marine Contractors Nederland Se System for placing a wind turbine assembly on a support structure
EP3653561A1 (de) * 2018-11-13 2020-05-20 NHLO Holding B.V. (hub)ausgleichsvorrichtung, hubsystem, verfahren zum heben und teilesatz zum federausgleich eines hubsystems
WO2020099520A1 (en) 2018-11-13 2020-05-22 Nhlo Holding B.V. (heave) balancing device, hoisting system, method for hoisting and kit of parts for spring balancing a hoisting system
DE102019104807A1 (de) * 2019-02-26 2020-08-27 Fipa Holding Gmbh Vakuum-hebevorrichtung
NL2022877B1 (en) * 2019-04-05 2020-10-12 Itrec Bv heave compensated dual hoist crane
WO2020204719A1 (en) * 2019-04-05 2020-10-08 Itrec B.V. Heave compensated dual hoist crane
US12006189B2 (en) 2019-04-05 2024-06-11 Itrec B.V. Heave compensated dual hoist crane
EP3869034A1 (de) * 2020-02-19 2021-08-25 Siemens Gamesa Renewable Energy A/S System und verfahren zur montage oder demontage einer windturbine
CN113697688A (zh) * 2021-08-16 2021-11-26 中际联合（北京）科技股份有限公司 用于船舶货物的装卸设备、补偿方法及其装置和海上平台
CN113697688B (zh) * 2021-08-16 2024-06-04 中际联合（北京）科技股份有限公司 用于船舶货物的装卸设备、补偿方法及其装置和海上平台

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