An unmanned semi-submarine, including a main hull; airfoil buoyancy chambers; an antenna; a radar; a propeller; a rudder; and compartments. The airfoil buoyancy chambers include a front buoyancy chamber and a rear buoyancy chamber. The front buoyancy chamber and the rear airfoil buoyancy chamber are longitudinally distributed on the main hull. The radar and the antenna are disposed on the top end of the front buoyancy chamber. The rudder is disposed on the rear buoyancy chamber. The propeller is disposed at the tail of the main hull to drive the unmanned semi-submarine. The horizontal sections of the front buoyancy chamber and the rear buoyancy chamber are symmetrical airfoil. The compartments include a front equipment compartment, a rear equipment compartment, a control equipment compartment, a battery compartment, and a propelling compartment. The compartments are separated from one another using watertight walls.

The present invention relates to a semi-submersible offshore structure. More particularly, the invention relates to a low motion semi-submersible offshore structure that has improved stability in deep water. The low motion semi-submersible experiences relatively lesser heave, pitch and wave motions compared to conventional semi-submersibles when the semi-submersible is operating in harsh offshore environments.

A method and apparatus for producing electricity from a combination of three sources: ocean waves, wind and solar, includes converting an upward and downward motion of a buoyant platform into a rotational motion of a shaft using a plurality of blades mounted to the shaft, the blades causing the shaft to rotate from internal wind energy as the blades move up and down within a cavity. The shaft is coupled to a generator for producing electricity. A wind turbine is mounted to the buoyant platform for converting wind energy into electricity. Further, solar panels are included, for example, mounted to the buoyant platform and/or turbine blades of the wind turbine, the solar panels also generate electricity when exposed to light.

A buoyant hydrodynamic pump is disclosed that can float on a surface of a body of water over which waves tend to pass. The pump incorporates an open-bottomed tube with a constriction. The tube partially encloses a substantial volume of water with which the tube's constriction interacts, creating and/or amplifying oscillations therein in response to wave action. Wave-driven oscillations result in periodic upward ejections of portions of the water inside the tube that can be collected in a reservoir that is at least partially positioned above the mean water level of the body of water, or pressurized by compressed air or gas, or both. Water within such a reservoir may return to the body of water via a turbine, thereby generating electrical power (making the device a wave engine), or else the device's pumping action can be used for other purposes such as water circulation, propulsion, or cloud seeding.

Delivery of a high volume of floating systems for wind turbines can make floating wind economic. The delivery can involve the standard design of sections, such as tubes or cans, comprising a rolled plate and ring stiffeners. The delivery can then involve the transportation of the sections in block to an assembly site that is closer to the planned installation point. The sections are used to manufacture floating vessels, such as semi-submersibles, buoyant towers, and/or spars, at the assembly site, which can include a barge with cranes. For semi-submersibles, the delivery can then involve the installation of the Tower, the nacelle, and blades using the barge cranes. Alternatively, for spars or buoyant towers, the nacelle and blades can be installed at an off-shore location using a platform, such as a standard jack-up vessel or a crane jacket.

An offshore drilling vessel includes a floating hull having a moonpool, a drilling tower positioned on the hull at or near the moonpool, a tubular string main hoisting device including a main hoisting winch and main cable connected to the main hoisting winch, a crown block mounted on the drilling tower, a travelling block suspended from the crown block in a multiple fall arrangement of the main cable, a mobile working deck and an integrated heave compensation system including a main cable heave compensation sheave in a path of the main cable between the main hoisting winch and the travelling block, a hydraulic sheave compensator connected to the main cable heave compensation sheave to provide a heave compensated motion of the travelling block, and a hydraulic deck compensator connected to the hull and to the mobile working deck to provide a heave compensated motion of the working deck relative to the hull within the heave compensation motion range.

Techniques and systems to reduce movement of at least one portion of an offshore platform. One portion of the offshore platform can provide a connection to a seafloor. A second portion of the offshore platform provides a lateral force to the first portion of the offshore platform while allowing for vertical movement between the first portion and the second portion of the offshore platform.

Systems and methods are disclosed herein for a modular buoy deployment system including modules arranged to be assembled at a destination location and an aerial delivery apparatus arranged to deliver the buoy modules to the destination location. The modules are connectable to at least one other module and form a buoy when assembled. The module buoy deployment system also optionally includes a platform arranged to receive one or more aerial delivery apparatuses. Each module conforms to a delivery criteria of the aerial delivery apparatus. The module buoy deployment system also optionally includes a power system arranged to recharge the aerial delivery apparatus.

An offshore drilling vessel includes a floating hull having a moonpool, a drilling tower positioned on the hull at or near the moonpool, a tubular string main hoisting device including a main hoisting winch and main cable connected to the main hoisting winch, a crown block mounted on the drilling tower, a travelling block suspended from the crown block in a multiple fall arrangement of the main cable, a mobile working deck and an integrated heave compensation system including a main cable heave compensation sheave in a path of the main cable between the main hoisting winch and the travelling block, a hydraulic sheave compensator connected to the main cable heave compensation sheave to provide a heave compensated motion of the travelling block, and a hydraulic deck compensator connected to the hull and to the mobile working deck to provide a heave compensated motion of the working deck relative to the hull within the heave compensation motion range.

The present disclosure relates to systems and methods for rotating a floating platform. An example method includes determining a desired position of a floating platform in a yaw axis. The floating platform is fixed by an anchor leg to an underwater attachment point. The method includes receiving, from a position sensor, information indicative of an actual position of the floating platform in the yaw axis. The method also includes rotating the floating platform in a desired direction about the yaw axis based on the desired position and the actual position. Optionally, the floating platform may include a yaw member and an environmental sensor. In such scenarios, the method may include receiving information about a prevailing wind direction or water current direction. The method may include causing the actuator to adjust the yaw member based on at least one of: the prevailing wind condition or the prevailing water current direction.