A damper for absorbing impact shock generated upon docking of a moving structure with a stationary structure or foundation is shown, the damper comprising a cylinder (1) connectable to the docking structure, the cylinder arranged with a cap end and a head end and having a piston (2) arranged movable in the cylinder and separating a cylinder cap volume (13) from a cylinder head volume (10). A check valve (14), a pressure relief valve (15) with adjustable opening pressure and an orifice (16; 23) of static size are respectively arranged in the cap end of the cylinder, wherein under constant load from the piston during a terminal stroke length of the damper in compression, the orifice provides a restricted flow from cylinder cap volume generating a constant pressure in the cylinder cap volume below the opening pressure of the pressure relief valve.

A system and method for mating equipment offshore to a spar buoy secured to a foundation without the use of a crane barge. The system comprises a floating vessel having a pair of forks defining a slot. A gimbal table, defining an opening, is positioned within the slot and connected to the vessel and a locking collar is mounted to the gimbal table. A mating member is attached to the spar buoy. The vessel is maneuvered to bring the spar buoy within the gimbal table opening. With the spar buoy positioned within the gimbal table opening, the locking collar is arranged and designed to releasably attach to the mating member of the spar buoy and restrict relative vertical motion between the spar buoy and the vessel while the gimbal table allows the floating vessel to roll and pitch without driving these motions into the spar buoy.

A real-time monitoring system for float-over installation in ocean engineering, which relates to real-time monitoring for the relative position between the leg mating unit and the stabbing cone of upper module, mainly includes: a shooting collection system and a real-time processing and displaying system, the shooting collection system mainly including a CCD camera and a high light-reflecting landmark, the high-precision CCD camera being a graphic information collecting device, and the high light-reflecting landmark being a mark made of high light-reflecting and light-absorbing materials; a real-time processing and collecting system, which receives and displays in real time, analyzes and stores the graphic information, capable of calculating the coordinates of relative position between the stabbing cone and the leg mating unit in real time. The system achieves real-time close-range photogrammetry for the position of the leg mating unit, characterized by clear positioning, explicit functions, being easy to realize the structures, thus solving the difficult problem that the relative position between the leg mating unit (LMU) and the stabbing cone of the module is difficult to be measured accurately in real time during the float-over installation.

A damper for absorbing impact shock generated upon docking of a moving structure with a stationary structure or foundation is shown, the damper comprising a cylinder (1) connectable to the docking structure, the cylinder arranged with a cap end and a head end and having a piston (2) arranged movable in the cylinder and separating a cylinder cap volume (13) from a cylinder head volume (10). A check valve (14), a pressure relief valve (15) with adjustable opening pressure and an orifice (16; 23) of static size are respectively arranged in the cap end of the cylinder, wherein under constant load from the piston during a terminal stroke length of the damper in compression, the orifice provides a restricted flow from cylinder cap volume generating a constant pressure in the cylinder cap volume below the opening pressure of the pressure relief valve.

A gravity-based foundation for the installation of offshore wind turbines, manufactured in a floating dock for towing to the final destination thereof, where it is anchored and finally completely submerged below sea level, comprising a concrete floating caisson, in the shape of a prism, with a hexalobular base, divided into several cells by at least one partition with a significantly circular cross section, concentric with a central cell, determining inner vertical cells interconnected with each other and with the exterior, which is closed at the top by a cover or covers that are removed once the foundation is anchored before being filled with a ballast material.

A real-time monitoring system for float-over installation in ocean engineering, which relates to real-time monitoring for the relative position between the leg mating unit and the stabbing cone of upper module, mainly includes: a shooting collection system and a real-time processing and displaying system, the shooting collection system mainly including a CCD camera and a high light-reflecting landmark, the high-precision CCD camera being a graphic information collecting device, and the high light-reflecting landmark being a mark made of high light-reflecting and light-absorbing materials; a real-time processing and collecting system, which receives and displays in real time, analyzes and stores the graphic information, capable of calculating the coordinates of relative position between the stabbing cone and the leg mating unit in real time. The system achieves real-time close-range photogrammetry for the position of the leg mating unit, characterized by clear positioning, explicit functions, being easy to realize the structures, thus solving the difficult problem that the relative position between the leg mating unit (LMU) and the stabbing cone of the module is difficult to be measured accurately in real time during the float-over installation.

A system and method for mating equipment offshore to a spar buoy secured to a foundation without the use of a crane barge. The system comprises a floating vessel having a pair of forks defining a slot. A gimbal table, defining an opening, is positioned within the slot and connected to the vessel and a locking collar is mounted to the gimbal table. A mating member is attached to the spar buoy. The vessel is maneuvered to bring the spar buoy within the gimbal table opening. With the spar buoy positioned within the gimbal table opening, the locking collar is arranged and designed to releasably attach to the mating member of the spar buoy and restrict relative vertical motion between the spar buoy and the vessel while the gimbal table allows the floating vessel to roll and pitch without driving these motions into the spar buoy.

A gravity-based foundation for the installation of offshore wind turbines, manufactured in a floating dock for towing to the final destination thereof, where it is anchored and finally completely submerged below sea level, comprising a concrete floating caisson, in the shape of a prism, with a hexalobular base, divided into several cells by at least one partition with a significantly circular cross section, concentric with a central cell, determining inner vertical cells interconnected with each other and with the exterior, which is closed at the top by a cover or covers that are removed once the foundation is anchored before being filled with a ballast material.

An offshore wind turbine jacket foundation capable with adjustable natural frequency and motion damping and a control method, comprising: a jacket; a tuned liquid damper system, comprising a central liquid tank communicated with seawater and distributed liquid tanks, wherein the central liquid tank and the distributed liquid tanks carry out liquid delivery through pipelines; a flow monitoring and control system configured to obtain storage information of each liquid tank by data acquisition; an acceleration data acquisition and analysis system configured to acquire acceleration data at key nodes of the jacket foundation; the pump on each pipeline is controlled based on the obtained data to realize the redistribution adjustment of the liquid storage and liquid level of each liquid tank in the damper system in a short time, and the mass distribution of the jacket structure as a whole is adjusted, so as to adjust the natural frequency and motion damping.