An offshore transfer trestle with wave compensation function and its working method

Abstract

The invention discloses a sea transfer trestle with wave compensation function and a working method thereof. The sea transfer trestle includes a heave mechanism, a trestle system and an active wave compensation control system. The invention can compensate the disturbance of the transfer trestle due to the swaying motion of the two ships, even if there is a difference in freeboard between the host ship and the target ship, it can still ensure that the safe angle between the trestle bridge body and the horizontal plane remains unchanged during the personnel transfer process of the transfer trestle bridge. Improve the safety and comfort of personnel transfer between two ships at sea. After the transfer trestle bridge of the present invention is lapped, the front end of the trestle bridge body is fixedly connected to the transfer point, and the personnel transfer process only needs to control the heave mechanism to ensure that the trestle bridge body and the horizontal plane maintain a safe angle. The front end of the trestle bridge body of the present invention and the transfer point are fixedly connected by electromagnetic landing cones, without additional mechanical devices for fixing, so that the trestle bridge body can be quickly separated from the transfer point in an emergency, and can be lifted urgently to improve safety sex.

Description

technical field [0001] The invention relates to technical equipment in the field of ships and ocean engineering, in particular to an offshore transfer trestle with wave compensation function and its working method. Background technique [0002] Oil exploration ships are used for deep-water oil exploration operations and carry drilling equipment. Due to the large number of equipment on board and limited cabins, they can accommodate fewer crew members. Every once in a while, they need to pass through shift ships and oil exploration ships carrying shift personnel. Rely on help to carry out personnel transfer between ships. The oil exploration ship is called the host ship, which is equipped with a dynamic positioning system, and the shift ship is called the target ship. The sea transfer trestle is placed on the host ship, and a sea personnel transfer channel can be established between the host ship and the target ship. In practice, affected by the marine environment such as win...

AI Technical Summary

Problems solved by technology

In practice, affected by the marine environment such as wind, waves, and currents, both the host ship and the target ship will have six degrees of freedom motions of roll, pitch, yaw, sway, surge, and heave. Disturbances are generated on the transfer trestle bridge, which poses safety hazards to the transfer of passengers at sea

[0003] Chinese invention patent CN106320161B discloses a six-degree-of-freedom active compensation offshore platform boarding trestle, including trestle, boarding platform, six-degree-of-freedom compensation platform, full-slewing mechanism, pitch compensator and telescopic compensator, six-degree-of-freedom compensation platform It can provide six-degree-of-freedom motion compensation for boarding and boarding trestles. The full-slewing mechanism, pitch compensator and telescopic compensator cooperate to compensate the uncompensated residual ship motion of the six-degree-of-freedom compensation platform, which is used for personnel between the ship and the fixed offshore platform Transshipment, but the six-degree-of-freedom compensation platform has a large number of driving mechanisms, complex structure, high energy consumption, and difficult coordinated control

[0004] Chinese invention patent CN106494577B discloses a trestle with active wave compensation function, including a lifting base, a bearing platform, a trestle and a telescopic support rod. The distance is greater than the safety distance and offsets the pitch angle change of the trestle bridge caused by the movement of the two floating bodies. It can be used for personnel transfer between two floating bodies at sea. However, the trestle bridge does not have a telescopic mechanism and cannot compensate for the distance change between the floating bodies caused by waves. The terminal of the trestle bridge moves on the floating body, causing safety hazards to people boarding and leaving the trestle bridge

[0005] Chinese invention patent CN108411766B discloses a position compensation retractable boarding trestle, including a base, a slewing seat, a telescopic trestle, a luffing cylinder and an industrial computer, etc. Both the ship where the trestle is located and the ship to be connected are equipped with a dynamic positioning system. Both the front end of the telescopic trestle and the lapped ship are equipped with MRU position and attitude measurement devices, which collect the position information of the front end of the telescopic trestle and the overlapping point of the ship respectively. The front end moves with the lapping point of the ship to achieve safe lapping. When the lapping is completed, the slewing, telescopic and pitching mechanisms all enter the passive compensation mode, which can be used for personnel and material transfer between ships at sea, but trestle bridges cannot be guaranteed. The body always maintains a fixed angle with the horizontal plane, which affects the comfort of personnel transfer and the safety of cargo transfer

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