Fundamental wave determining method for jacket platform frequency spectrum fatigue analysis

A jacket platform, fatigue analysis technology, applied in the field of spectrum fatigue analysis method, can solve problems such as ocean engineering that have not been raised

Active Publication Date: 2014-09-03
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many studies abroad on the nonlinear problems in the spectrum fatigue analysis method, there is no practical method that

Method used

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  • Fundamental wave determining method for jacket platform frequency spectrum fatigue analysis
  • Fundamental wave determining method for jacket platform frequency spectrum fatigue analysis
  • Fundamental wave determining method for jacket platform frequency spectrum fatigue analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] The same wave period T v Below each single rule wave height with the number of waves The corresponding relationship is fitted to the wave quantity curve of a single regular wave with the same wave period (the wave probability of a single regular wave with the same wave period and different wave heights). Such as image 3 As shown, the abscissa is the wave height of each single regular wave From the lowest numerical single regular wave height to the highest valued single regular wave height The total number of waves of a single regular wave with the same wave period is the total area between the number curve of a single regular wave with the same wave period and the abscissa

[0166] Calculate the height of a single regular wave on the abscissa to the highest valued single regular wave height The area under the corresponding wave number curve of a single regular wave of the same wave period where (1≤k≤i-1).

[0167] The excess percentage can be selecte...

Embodiment 2

[0170] Accumulate the wave period T v Under all single rule wave heights The corresponding number of all waves The total number of single regular waves of the same wave period obtained from the highest single regular wave wave height At the beginning, the wave numbers corresponding to the heights of each single regular wave are added successively from high to low to obtain Among them (1≤k≤i-1), k starts to take the value from i-1, and takes it as i-2, i-3... until Equal to the selected excess percentage, the corresponding single regular wave height at this time That is, the wave period T v The underlying wave height.

[0171] In practical applications, the ratio of the accumulated value of the number of waves to the total number of waves of a single regular wave of the same wave period (such as or ) may not be exactly equal to the selected excess percentage, at this time, the single regular wave height corresponding to the ratio closest to the excess percentag...

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Abstract

The invention provides a fundamental wave determining method for jacket platform frequency spectrum fatigue analysis. The method includes the steps that firstly, sea condition data are obtained; secondly, the sea condition data are processed; thirdly, wave spectra corresponding to sea conditions in all single directions are calculated; fourthly, the height of single rule waves of each sea condition and probability distribution of the cycle of the corresponding wave in each single direction are obtained; fifthly, the number of the single rule waves is calculated; sixthly, the heights of the same single rule waves and the numbers of the single rule waves of the corresponding wave cycles are accumulated, and a distribution histogram of the heights of the single rule waves, the wave cycles and the wave numbers is obtained; seventhly, the numbers of the single rule waves are expressed in a percentage mode according to the corresponding relation of the heights of the single rule waves and the number of the waves in each wave cycle, and the heights of the fundamental waves which exceed the percentage with the determined cycle are determined. According to the fundamental wave determining method for the jacket platform frequency spectrum fatigue analysis, a calculation result is not affected by the non-linear relationship between the heights of the ocean waves and wave force, and the accuracy of frequency spectrum fatigue analysis calculation is ensured.

Description

technical field [0001] The invention relates to a spectrum fatigue analysis method, in particular to a fundamental wave determination method for spectrum fatigue analysis of a jacket platform. Background technique [0002] The offshore platform structure is the basic facility for the development of offshore oil and gas resources, and the base for offshore production, operation and life. As the basic facilities for the development of offshore oil and gas resources, the environment in which the offshore platform is located is very complex and harsh, and it bears a variety of loads that vary with time and space. The effects of these loads are long-term, continuous, and random. The continuous cyclic ocean wave load may cause fatigue damage to the jacket structure, thereby reducing the reliability of the system and bringing many adverse effects on production and life. Therefore, it is particularly important to conduct a meaningful analysis of the fatigue life of offshore platfor...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 冯勤钱亚林陈尚周张文学
Owner CHINA PETROCHEMICAL CORP
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