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A restraining device for heaving motion of semi-submersible platform

A technology of semi-submersible platform and suppression device, which is applied in the direction of equipment for reducing ship movement, transportation and packaging, floating buildings, etc. It can solve the problems of large riser fatigue damage, small additional mass, and limited suppression effect, and achieve good results. The effect of vibration suppression

Active Publication Date: 2021-01-26
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shallow draft, the response of the heave motion of the semi-submersible platform is large, and the fatigue damage to the riser is relatively large. At the same time, the natural period of the heave response motion is close to the energy period of the wave, so the response of the heave motion is lower than that of other degrees of freedom. Resonance is more likely to occur under normal sea conditions, which puts forward higher requirements for the selection of production platform riser and Christmas tree system, drilling platform heave compensation device, etc., which increases the operation and maintenance costs
[0003] At present, there are not many achievements in the application of heave control technology and devices for semi-submersible platforms. Some researchers have explored the use of fixed heave plates to suppress the heave motion. The adaptability is poor, and the added additional mass is small, and the suppression effect is limited

Method used

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  • A restraining device for heaving motion of semi-submersible platform
  • A restraining device for heaving motion of semi-submersible platform
  • A restraining device for heaving motion of semi-submersible platform

Examples

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Effect test

Embodiment 1

[0024] Such as Figure 1-3 As shown, a device for suppressing the heaving motion of a semi-submersible platform includes an upper platform structure (100), and a lower floating body (400) is connected below the upper platform structure (100) through a column (200), and the column ( 200) is provided with a heave suppression mechanism that reduces the heave motion of the platform by changing the natural period of the heave of the platform and the flow field around the column (200).

[0025] The heave suppression mechanism is an extendable annular heave plate (300) which is arranged on the column (200) and forms a certain angle with the column, and an electric rope winch. The electric rope winch is provided with a steel wire rope (305) and a Stretching the annular heave plate (300) is connected. The electric winch is installed above the upper platform structure (100). The main function of the above-mentioned stretchable heave plate structure with variable inclination is to dest...

Embodiment 2

[0033] Such as Figure 4-5 As shown, a device for suppressing the heaving motion of a semi-submersible platform includes an upper platform structure (100), and a lower floating body (400) is connected below the upper platform structure (100) through a column (200), and the column ( 200) is provided with a heave suppression mechanism that reduces the heave motion of the platform by changing the natural period of the heave of the platform and the flow field around the column (200).

[0034] The heave suppression mechanism is an active tuning mass damper, and the active tuning mass damper includes a power system, a tuning control system (500), a damping system, a spring system (600), and a variable mass floating body (700), wherein : The damping system is formed by utilizing the water body around the variable mass floating body, the variable mass floating body (700) is sleeved on the column (200), and the inner diameter of the variable mass floating body (700) is greater than the...

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Abstract

A device for suppressing the heaving motion of a semi-submersible platform, comprising an upper platform structure, a lower floating body is connected to the lower part of the upper platform structure through a column, and the feature is that the column is equipped with a device that lowers the platform by changing the surrounding flow field. A heave suppression mechanism that produces a heave motion. A heave suppression mechanism of the present invention, the heave suppression mechanism is an extendable annular heave plate and an electric rope winch arranged on a column and forming a certain angle with the column, and the electric rope winch is provided with a steel wire rope and a Extended ring heave plate connection. It has an active control function. By adjusting the vibration frequency of the mass body, its vibration frequency is always kept near the frequency of the semi-submersible platform structure to achieve better vibration suppression.

Description

technical field [0001] The invention relates to a control device for suppressing heave motion of a semi-submersible platform, belonging to the technical field of marine technical equipment. Background technique [0002] As offshore oil development continues to move towards deep water, semi-submersible platforms have become the main platform type for offshore oil and gas development due to their advantages such as good maneuverability, large working water depth, and strong adaptability to harsh sea conditions. Its main structure includes platform body, column and lower body (or buoyancy tank), is provided with support member between platform and column and increases overall rigidity. The inherent vibration period of its structure is relatively large, and the movement period in all directions is also relatively large. The period of roll and pitch is about 30-60 seconds, and the period of surge, sway and yaw is generally greater than 100 seconds, which can effectively prevent t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B39/00B63B35/44
CPCB63B35/44B63B39/00B63B2035/442
Inventor 魏东泽徐欣霞顾恩凯林斐陈鹏宇
Owner ZHEJIANG OCEAN UNIV
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