Semi-submersible platform fatigue damage evaluation method combining offshore actual measurement and numerical analysis

A numerical analysis and fatigue damage technology, which is applied in the field of ships and ocean engineering, can solve the problems of conservative calculation results and large calculation errors, and achieve the effect of ensuring safe use performance requirements

Active Publication Date: 2019-10-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In the prior art, the evaluation method for the fatigue damage of the semi-submersible platform is mainly to use the finite element software to estimate the fatigue damage of the semi-submersible platform in the frequency domain. , this is because the accurate fatigue damage prediction analysis method not only needs to consider the analysis results of theoretical numerical calculations, but also needs accurate data from offshore measurements

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  • Semi-submersible platform fatigue damage evaluation method combining offshore actual measurement and numerical analysis
  • Semi-submersible platform fatigue damage evaluation method combining offshore actual measurement and numerical analysis
  • Semi-submersible platform fatigue damage evaluation method combining offshore actual measurement and numerical analysis

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[0047]Carry out fatigue damage assessment on the target semi-submersible platform, combining actual measurement and numerical analysis at sea. In the actual measurement at sea, it can be obtained as Figure 4 and Figure 5 The time-domain wave data and time-domain stress data are shown.

[0048] After FFT transformation, the corresponding measured ocean wave spectrum in the frequency domain is obtained, in the form of Figure 6 As shown, the stress spectrum of the measuring point and the stress spectrum of the hot spot (the hot spot refers to the dangerous node that is prone to damage on the platform, and the stress on it can be estimated from the stress of the measuring point), in the form of Figure 7 .

[0049] In the numerical analysis, the finite element model of the target semi-submersible platform is first established, and after applying regular waves corresponding to each wave angle and period, the stress transfer function (amplitude response operator RAO) at the me...

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Abstract

The invention discloses a semi-submersible platform fatigue damage assessment method combining offshore actual measurement and numerical analysis, which relates to the field of ship and ocean engineering, solves the problems of conservative evaluation and calculation results and large errors in the prior art, and adopts the technical scheme of converting marine actual measurement time domain sea wave data of a semi-submersible platform into a frequency domain actual measurement sea wave spectrum, and marine actual measurement time domain stress data of the semi-submersible platform are converted into a frequency domain actual measurement stress spectrum; performing numerical analysis on the semi-submersible platform by utilizing finite element software, and calculating a stress transfer function at a stress measuring point position and a stress transition function from the stress measuring point position to a hot spot position under the action of each regular wave; a semi-submersible platform is used for actually measuring a stress spectrum and a hot spot position stress transition function on the sea. According to the semi-submersible platform fatigue damage assessment method, fatigue damage is forecasted by means of actual measurement, data precision is guaranteed, and safety of offshore operation of the platform is effectively guaranteed.

Description

technical field [0001] The invention relates to ships and marine engineering, in particular to a semi-submersible platform fatigue damage assessment method combined with offshore actual measurement and numerical analysis. Background technique [0002] The semi-submersible platform is a large-scale offshore structure suitable for deep-water operations. It has the advantages of stable operating conditions, good mobility, and large operating depth. When operating at sea, under the action of alternating wind, waves and current loads, fatigue damage will occur at hot spots where the structure is prone to damage, affecting the safety and usability requirements of the structure. [0003] In order to evaluate the fatigue damage and predict the fatigue life of the semi-submersible platform in offshore operation, an accurate fatigue prediction analysis method is needed. In the prior art, the evaluation method for the fatigue damage of the semi-submersible platform is mainly to use th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2111/10G06F30/15G06F2119/04G06F30/23G06F2119/06Y02A90/10
Inventor 杨建民王璞武博李欣寇雨丰邓建伟
Owner SHANGHAI JIAO TONG UNIV
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