In a heave motion compensation system and method for adjusting heave motion compensation, for use with an offshore hoisting device, the heave compensation is provided by, firstly, a cylinder having a piston, which is to be connected to a gas buffer for providing the hoisting device with passive HC, and secondly a sheave head, including one or more sheaves for engaging a hoisting wire of the hoisting device, wherein the sheave head is supported by the piston for movement along a HC-trajectory, and thirdly a sheave head track, extending parallel to the HC-trajectory. The adjusting of the passive HC is realized by adjusting movement of the piston of the heave compensation cylinder using an adjusting winch connected to the piston of the cylinder via a trolley supported by a trolley track, which track is located adjacent the HC-trajectory.

A coupling device for recovering an unmanned ship includes: a coupling unit, which is lifted and lowered by being connected to a crane provided in a mother ship; an accommodation unit provided in the unmanned ship, and having a vertically communicating coupling hole; a guide unit performing guiding such that the coupling unit is coupled to the accommodation unit, and including a towing line formed to be long, and a winch connected to the other side of the towing line so as to selectively wind or unwind the towing line; and a control unit including a sensing part for sensing the tension applied to the towing line by the driving of the winch, and a control part for lowering the coupling unit connected to the crane, if the intensity of the tension sensed by the sensing part is a preset value or higher.

A drilling apparatus is provided. The drilling apparatus according to one aspect of the present invention comprises: first and second moving modules; first to third drawworks for vertically moving the first and second moving modules; a wire for successively connecting the first drawwork, the first moving module, the second drawwork, the second moving module and the third drawwork; a first fixing drum positioned between the first drawwork and the first moving module so as to support the wire; and a second fixing drum positioned between the second moving module and the third drawwork so as to support the wire.

An unmanned aerial device according to an aspect of the present invention includes an aerial device body capable of flying in an unmanned manner, and a load-lowering device mounted to the aerial device body and configured to lower a load from the aerial device body. The load-lowering device has a linear member holder for holding a linear member having one end portion connectable to the load, the linear member holder holding at least the other end portion of the linear member, and a speed limiting mechanism that limits a speed at which the linear member is pulled out of the linear member holder, under a weight of the load.

Disclosed is a system and a method for deploying and recovering an autonomous underwater craft by a ship-towed recovery vehicle. The craft is stored in the recovery vehicle's housing. The deployment is carried out in a first stage submerging the recovery vehicle with the craft stored therein, and a second stage releasing the craft. The ship includes a tilting launch ramp where the recovery vehicle is stored. The launch ramp takes at least a raised position with the recovery vehicle out of the water and an inclined position with the launch ramp rear end immersed. A translational device enables, in the launch ramp inclined position, the recovery vehicle to move along the launch ramp to be submerged and move from the ship while in tow during deployment and to be raised along the launch ramp during recovery. The system and the craft form an underwater exploration assembly.

The present specification provides a device and method for controlling a winch parcel delivery system through an uncrewed aerial vehicle (UAV) or drone. The example apparatus contemplates the use of a winch that will attach to a hook with active and passive release mechanisms through a winch line. The apparatus is enabled to attach to a parachute recovery system. The apparatus can detect when the ground has been reached to enable safe delivery of parcels. The apparatus can removably attach to various types of drones.

A method of providing motion compensation of a subsea package with a synthetic rope comprising attaching the synthetic rope to the subsea package, supporting a first gripper with a wire rope from a winch capable of motion compensation control characteristics and gripping the synthetic rope with the first gripper, supporting a second gripper with a second wire rope, and repeating the following sequence: lowering the first gripper, the synthetic rope, and the subsea package a first distance, gripping the synthetic rope with the second gripper, releasing the first gripper from the synthetic rope, raising the first gripper the first distance, gripping the synthetic rope with the first gripper, releasing the second gripper from the synthetic rope, such that when the subsea package is lowered proximate the subsea landing location the winch capable of operating with motion compensation characteristics can operate to compensate for the vessel motion and smoothly lower the subsea package to the subsea landing location.

A method of providing motion compensation of a subsea package with a synthetic rope comprising attaching the synthetic rope to the subsea package, supporting a first gripper with a wire rope from a winch capable of motion compensation control characteristics and gripping the synthetic rope with the first gripper, supporting a second gripper with a second wire rope, and repeating the following sequence: lowering the first gripper, the synthetic rope, and the subsea package a first distance, gripping the synthetic rope with the second gripper, releasing the first gripper from the synthetic rope, raising the first gripper the first distance, gripping the synthetic rope with the first gripper, releasing the second gripper from the synthetic rope, such that when the subsea package is lowered proximate the subsea landing location the winch capable of operating with motion compensation characteristics can operate to compensate for the vessel motion and smoothly lower the subsea package to the subsea landing location.

A wave-induced motion compensation crane and corresponding vessel and method are disclosed. The crane includes a motion compensation device at a tip end portion of the boom structure to compensate for X-Y wave-induced motion and a heave compensation device for Z-motion. The motion compensation device includes a moveable jib beam that extends in a substantially horizontal direction. The jib beam is slewable about a substantially vertical slew axis and translatable in a longitudinal direction of the jib beam. Preferably, the jib beam can be levelled based on the angular orientation of the boom structure.

A wireline tensioner includes at least one sheave, a first accumulator unit, a second accumulator unit, a hydraulic distribution system, and a hydraulic cylinder unit which is operatively connected to the at least one sheave, to the first accumulator unit and to the second accumulator unit via the hydraulic distribution system. The first accumulator unit receives hydraulic fluid from the hydraulic distribution system at a first hydraulic pressure. The second accumulator unit receives the hydraulic fluid from the hydraulic distribution system at a second hydraulic pressure. The first hydraulic pressure is lower than the second hydraulic pressure.