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Dynamic instability recognition method based on tension leg parameter atlas

A technology of instability and identification method, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as fatigue damage, tension leg damage, dynamic instability, etc., to improve offshore installation speed and save costs and risk, the effect of addressing excessive stress failure or fatigue damage

Active Publication Date: 2017-05-10
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and provide a dynamic instability identification method based on the TLP parameter map, which can not only quickly identify the dynamic instability of the TLP at sea, but also solve the problem of tension leg overstress failure or fatigue damage; moreover, it greatly saves the cost and risk of tension leg and platform offshore installation; improves offshore installation speed, engineering quality and work efficiency

Method used

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  • Dynamic instability recognition method based on tension leg parameter atlas
  • Dynamic instability recognition method based on tension leg parameter atlas
  • Dynamic instability recognition method based on tension leg parameter atlas

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Embodiment Construction

[0061] Such as Figure 1-Figure 8 Shown, the present invention adopts following steps:

[0062] Step 1: Establish the motion dynamic equation of the tension leg with system damping;

[0063] The second step: based on the dynamic equation of the tension leg with system damping, the infinite determinant matrix is ​​constructed by the harmonic balance incremental method;

[0064] The third step: apply the recursive formula of the infinite determinant matrix to obtain the stability parameter diagram of the nonlinear dynamic equation with damping;

[0065] Step 4: Draw the dynamic stability parameter map of the dynamic stability of the tension leg with damping;

[0066] Step 5: According to the stability parameter map determined by the motion dynamics of the tension leg with damping, determine the suppression effect of damping on system instability in different stable regions;

[0067] Step 6: According to the suppression effect of damping on system instability in different stable...

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Abstract

A dynamic instability recognition method based on a tension leg parameter atlas comprises the following steps that 1, a motion power equation with system damping for tension legs is built; 2, a harmonic balance incremental method is adopted for constructing infinite determinant matrix; 3, a nonlinear dynamic equation stability parameter diagram with damping is obtained; 4, the motion power stability parameter atlas with damping for the tension legs is drawn; 5, inhibitory effects of damping for system instability in different stability regions are determined; 6, according to the inhibitory effects of damping for system instability in different stability regions, power instability parameter recognition is obtained. According to the method, tension leg platform power instability can be rapidly recognized on the sea, and the problem of tension leg excessive stress failure or fatigue damage is solved; meanwhile, the tension leg and platform marine installation cost and risk are greatly lowered; the marine installation speed is increased, and the project quality and working efficiency are improved.

Description

technical field [0001] The invention relates to a tension leg platform, in particular to a dynamic instability identification method based on a tension leg parameter map. It belongs to the field of offshore oil engineering. Background technique [0002] As a typical type of production platform for deepwater oil and gas development, the tension leg platform has gradually matured after decades of development and has been widely used in the world. The installation of the tension leg has become an important link in the construction of the tension leg platform, which is a key step in the offshore installation of the tension leg platform. [0003] During the installation of tension legs at sea, due to the influence of wind, waves, currents, etc., the tension of the tension legs will also change periodically, which will excite the parametric resonance of the tension legs and bring great risks to the installation work; especially in the tension leg When installing and connecting w...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06
Inventor 李怀亮黄山田魏佳广李小龙张立邦王衍鑫朱生东王浩宇杜永军李可邱炜王亮陈希远李凯李登跃
Owner CHINA NAT OFFSHORE OIL CORP
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