A wave-induced motion compensating crane includes a hoist assembly. At least two departure sheaves are mounted at opposite lateral sides of the jib. The object suspension device is supported both by two hoist cables extending laterally from the jib and a third hoist cable that runs via another departure sheave. The hoist assembly is adapted to hoist and/or lower the object suspension device with an object connected thereto, between a lower position and a position at a height up to the departure sheaves while the hoist cables together define a reverse pyramid, diverging upwards in between the object suspension device and the departure sheaves.

The present invention relates to lifting gear comprising a hoist rope, on which a load-receiving means is provided for receiving and lifting a load, and a determining device for determining slack rope on the hoist rope, wherein the aforementioned determining device comprises an inclination sensor system for detecting an inclination and/or a tilt rate and/or a tilt acceleration of the load-receiving means and provides a slack-rope signal if the detected inclination and/or tilt rate and/or tilt acceleration of the load-receiving means exceeds a predetermined limit value.

Provided is a lifting arrangement configured to facilitate alignment of a load with a wind turbine assembly. The lifting arrangement includes a crane arrangement for hoisting the load to the wind turbine assembly, a tagline arrangement for stabilizing the load during a lifting manoeuvre, a sensor arrangement configured to detect a motion of the wind turbine assembly relative to the load during the lifting manoeuvre, an actuator arrangement for adjusting the position of the load relative to the wind turbine assembly, and a control arrangement for controlling actuators of the actuator arrangement to reduce the detected relative motion. Also provided is a method of aligning a load with a wind turbine assembly.

A crane is provided. The crane includes an acceleration sensor that detects the acceleration of a load, wherein a target velocity signal is converted into target location coordinates of the load, current location coordinates of a boom are calculated from a slewing angle, a luffing angle, and an expansion/contraction length, the spring constant of a wire rope is calculated from the previously calculated location of the load from a unit time earlier, the current location coordinates of the boom, and the current accelerations of the load as detected by the acceleration sensor, target location coordinates of the boom are calculated from the accelerations, the spring constant, and the target location coordinates of the load, and an actuator operation signal is generated.

Provided is a system for assembling or disassembling components of a wind turbine including: a motion compensation mechanism, wherein the motion compensation mechanism includes: a first connection interface for connection with a first component of the wind turbine moved by a crane, a second connection interface for connection with a second component of the wind turbine, a tension element connecting the first connection interface and the second connection interface, and a tension device for keeping the tension element under constant tension as the first component and the second component move relative to each other, wherein the motion compensation mechanism allows a movement of the first component relative to the second component as the first component and the second component are moved relative to each other on a given trajectory.

A wave-induced motion compensating crane includes a hoist assembly. At least two departure sheaves are mounted at opposite lateral sides of the jib. The object suspension device is supported both by two hoist cables extending laterally from the jib and a third hoist cable that runs via another departure sheave. The hoist assembly is adapted to hoist and/or lower the object suspension device with an object connected thereto, between a lower position and a position at a height up to the departure sheaves while the hoist cables together define a reverse pyramid, diverging upwards in between the object suspension device and the departure sheaves.

A wave-induced motion compensating crane includes a hoist assembly. At least two departure sheaves are mounted at opposite lateral sides of the jib. The object suspension device is supported both by two hoist cables extending laterally from the jib and a third hoist cable that runs via another departure sheave. The hoist assembly is adapted to hoist and/or lower the object suspension device with an object connected thereto, between a lower position and a position at a height up to the departure sheaves while the hoist cables together define a reverse pyramid, diverging upwards in between the object suspension device and the departure sheaves.

A deepwater hoisting system includes a synthetic fibre rope winch assembly including a motor driven first winch and a length of synthetic fibre rope driven by said first winch. The synthetic fibre rope has an end remote from the first winch. The system further includes a steel wire winch assembly including a motor driven second winch and a length of steel wire driven by said second winch. The steel wire has an end remote from the second winch. At least the second winch is an active heave compensation motor driven winch. The system further includes a lifting block having a lifting block sheave, through which the synthetic fibre rope is run. The end of the synthetic fibre rope is connected to the end of the steel wire, so that the lifting block is suspended in a double-fall arrangement.

A deepwater hoisting system includes a synthetic fibre rope winch assembly including a motor driven first winch and a length of synthetic fibre rope driven by said first winch. The synthetic fibre rope has an end remote from the first winch. The system further includes a steel wire winch assembly including a motor driven second winch and a length of steel wire driven by said second winch. The steel wire has an end remote from the second winch. At least the second winch is an active heave compensation motor driven winch. The system further includes a lifting block having a lifting block sheave, through which the synthetic fibre rope is run. The end of the synthetic fibre rope is connected to the end of the steel wire, so that the lifting block is suspended in a double-fall arrangement.

A tension setting system for a remote setting of a tension in a transfer cable ensuring a displacement of a transfer carriage along a jib of a crane, including a winch equipped with a motor cooperating with the cable so as to ensure a displacement of the carriage, a pilot unit connected to the motor to pilot a displacement of the carriage, and a setting mechanical device mounted on the carriage and adapted to be actuated by the action of a displacement of the carriage. The setting mechanical device is coupled to the cable and configurable between a working configuration in which the mechanical device stands still irrespective of the displacement of the carriage and results in a holding of the tension in the cable, and a detent configuration in which, by the action of a displacement of the carriage piloted by the pilot unit according to a first sequence of reciprocating displacement, the mechanical device results in a release of the tension in the cable.