Offshore transfer trestle with wave compensation function and working method thereof

Abstract

The invention discloses an offshore transfer trestle with a wave compensation function and a working method thereof. The offshore transfer trestle comprises a heaving mechanism, a trestle system and an active wave compensation control system. According to the invention, the disturbance to the transfer trestle caused by the swaying motion of the two ships can be compensated, even if a freeboard difference exists between the host ship and the target ship, the safe angle between the trestle body and the horizontal plane can still be kept unchanged in the personnel transfer process of the transfer trestle, and the safety and comfort of personnel transfer between the two ships on the sea are improved. After lap joint of the transfer trestle is completed, the front end of the trestle body is fixedly connected with a transfer point, and in the personnel transfer process, the safe angle between the trestle body and the horizontal plane is kept unchanged only by controlling the heaving mechanism. The front end of the trestle body and the transfer point are fixedly connected through the electromagnetic landing cones, an additional mechanical device is not needed for fixing, the trestle body can be rapidly separated from the transfer point in an emergency, emergency lifting is achieved, and safety is improved.

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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