Coupling motion and force measuring simulation experiment system of marine floating structure under action of internal solitary wave

Abstract

The invention discloses a coupling motion and force measuring simulation experiment system of marine floating structure under the action of internal solitary wave, which comprises a floating structuremodel, a motion response recording unit, an anchor chain unit and an anchor chain force measuring unit; the dynamic response of the floating structure model and the stress of anchor chain under the action of the internal solitary wave can be recorded in real-time; the floating structure model comprises a platform body, a motion measuring device installation department and counterweight; the floating structure model has the advantages that each part is independent, convenient to install, and convenient to increase and decrease the counterweight; with the combination of a micro-electronic gyroscope and a micro-electronic accelerometer, the motion response recording unit has the advantages of high measuring precision, small volume and low cost; the motion response recording unit not only canaccurately measure the motion response of the floating structure, but also can obtain the resultant force by analyzing the acceleration of the platform; in addition, by using fiber Bragg grating to measure the force of the anchor chain, not only can the distribution characteristics of the force of the anchor chain be obtained, but also the bending of the anchor chain can be understood through thedifferent stress and strain of the fiber Bragg grating. The construction and implementation of this experimental system is of great significance to the study of the stability of the floating structure.

Description

technical field [0001] The invention relates to the technical field of offshore floating structure test equipment, in particular to a coupling motion and force measurement simulation experiment system of an ocean floating structure under the action of internal solitary waves. Background technique [0002] Ocean internal waves are a form of fluctuations that occur below the surface of seawater, and are a type of gravity wave, or internal inertial gravity wave. In recent decades, experts and scholars from various countries have discovered through actual measurement or remote sensing that internal waves are a very common natural phenomenon in the ocean. The wavelength range of internal waves in the ocean generally ranges from hundreds of meters to tens of kilometers, and the period ranges from minutes to hours. In continuously stratified seawater, the density gradients produced by cold water, hot water or fresh water, and salt water are usually relatively small, but it is prec...

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Problems solved by technology

However, in deep sea areas such as the South China Sea, due to the stratification of seawater density, when the surface tide and internal tide travel from the deep sea to the shallow sea, affected by the topography of the seawall and hills in the Luzon Strait of the South China Sea, it is easy to form internal solitary waves with large amplitudes. Thereby posing certain dangers to offshore oil exploitation operations

In 1987, when the research team was designing the Liuhua offshore oil platform, they encountered a strong internal solitary wave, which caused damage to the platform being installed

In 2006, the Discoverer534 platform encountered internal waves during cementing operations. The strong internal wave flow caused excessive lateral displacement of the platform, and the emergency release procedure was activated, resulting in cementing failure.

[0005] Under the joint action of internal solitary waves and anchor chain units, the floating structure will have a six-degree-of-freedom motion response. Traditional test methods are difficult to capture the motion characteristics of the platform and the real-time force of the anchor chain units. At present, the movement of floating structures under the action of internal solitary waves The experimental research on the response is almost zero, and most of the existing research is the force experiment and theoretical calculation of the fixed platform model

For example, Song Zhijun of Dalian University of Technology theoretically analyzed the motion response of floating structures under the action of internal solitary waves, and You Yunxiang of Shanghai Jiaotong University et al. conducted experimental research on the wave force on floating structures under the action of internal solitary waves. There are few reports on the experimental research on the response of floating structures under solitary waves

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