Control system for stabilizing and reducing swing through tuning heaving plate of deep-water dynamic-positioning semi-submersible platform

Abstract

The invention discloses a control system for stabilizing and reducing swing through a tuning heaving plate of a deep-water dynamic-positioning semi-submersible platform, and relates to a tuning heaving plate system of the deep-water semi-submersible platform. Lower ends of two platform stand columns on the same side of a deck of the semi-submersible platform are fixedly connected with a platform floating box, and the tuning heaving plate systems are respectively mounted at the bottom of the platform floating box and directly under the platform stand columns; each of the tuning heaving plate systems comprises a heaving plate, connecting truss frames, a restoring spring, active variable damping devices and limiting springs. According to the control system disclosed by the invention, a heaving response can be controlled or the rolling freedom degree or the pitching freedom degree can be stabilized respectively by regulating the rigidity of the restoring springs according to marine conditions or actual requirements, so that a motion response of the freedom degree of a perpendicular plane which cannot be controlled by a dynamic positioning system is controlled, and the semi-submersible platform is suitable for worse marine conditions.

Description

technical field [0001] The invention relates to a semi-submersible platform, in particular to a deep-water dynamic positioning deep-water semi-submersible platform with movable tuning heave plates. Background technique [0002] The deepwater semi-submersible platform has become one of the important equipment for deepwater oil and gas exploration and development due to its large deck area, large loading capacity and low construction difficulty. As the operating water depth of the platform increases, the length and strength of the anchor chains of the traditional mooring system need to increase, thus causing the weight of the entire mooring system to increase sharply, and the arrangement of the anchor chains is more complicated and needs to cover a larger water surface area. Interfere with the navigation or drilling operations of other ships. For this reason, the dynamic positioning system is widely used on deep-water marine floating structures because its cost does not incre...

AI Technical Summary

Problems solved by technology

The dynamic positioning system is limited by the output direction of the thruster, and can only control the degrees of freedom of surge, sway and yaw

Therefore, the response of the deep-water semi-submersible platform using the dynamic positioning system is more difficult to control in the degrees of freedom of heave, roll and pitch.

Affected by swell waves, excessive roll and pitch responses will reduce the air gap of the platform, which in turn will cause waves to attack the lower deck of the platform, and adversely affect the comfort of the crew and the safety of operations. Productivity

In addition, excessive roll and pitch responses can cause damage to cargo on the platform

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