Wave scatter diagram chunking equivalent method for time domain fatigue analysis

A fatigue analysis and scatter diagram technology, applied in the effective field, can solve the problem of low calculation efficiency of structural fatigue analysis, and achieve the effect of improving the efficiency of fatigue assessment, ensuring the accuracy of fatigue assessment, and reducing the number of calculated sea states.

Active Publication Date: 2015-10-28
OCEAN UNIV OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to propose a block equivalent method for wave scatter diagrams for time-domain fatigue analysis in view of the technical problem

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  • Wave scatter diagram chunking equivalent method for time domain fatigue analysis
  • Wave scatter diagram chunking equivalent method for time domain fatigue analysis
  • Wave scatter diagram chunking equivalent method for time domain fatigue analysis

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Embodiment Construction

[0019] Based on the principle of wave energy equivalence, the present invention proposes for the first time a method for evaluating fatigue strength by dividing adjacent multiple sea states in the wave scatter diagram into blocks and replacing original sea states with equivalent sea states. By reducing the number of calculated sea states and improving the efficiency of fatigue assessment, while ensuring the accuracy of fatigue assessment, the calculation efficiency is improved, which has high practical value. The present invention will be further described below in conjunction with specific embodiments.

[0020] refer to figure 1 , is a flow chart of the method of the present invention, mainly comprising: step S1, using the wave scatter diagram to describe the long-term distribution of sea conditions in a certain sea area, and dividing the adjacent sea conditions in the wave scatter diagram in the form of blocks; step S2 , For each block sea state mentioned above, replace it ...

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Abstract

The invention relates to a wave scatter diagram chunking equivalent method for time domain fatigue analysis. The method comprises the following steps: describing the long-term sea state distribution condition of a certain sea area by utilizing a wave scatter diagram and grouping a plurality of adjacent sea states in the wave scatter diagram in a manner of chunking so as to form a single equivalent sea state; calculating an equivalent zero-crossing period of the equivalent sea state according to a principle that the wave surface average zero-crossing rates are equal; and calculating a zero order moment of an equivalent sea state wave spectrum according to a principle that the wave energy of the equivalent sea state is equal to that of the chunking sea state and further calculating an equivalent significant wave height of the equivalent sea state according to the obtained zero-crossing period of the equivalent sea state and the zero order moment of the wave spectrum. According to the method provided by the invention, structure fatigue strength assessment is carried out by replacing the abundant original sea states by less equivalent sea states, and the aim of increasing the efficiency is achieved through decreasing the sea state computing number, so that the computing efficiency can be greatly improved while the fatigue life evaluation precision is ensured, and relatively higher practical engineering application value is provided.

Description

technical field [0001] The invention belongs to the technical field of structural fatigue evaluation and analysis, and in particular relates to a wave scatter diagram block equivalent method for time domain fatigue analysis. Background technique [0002] With the large-scale development of marine resource development, various marine engineering structures have emerged as the times require. The offshore platform structure is a structure that provides production and living facilities for drilling, oil production, transportation, observation, navigation, construction and other activities at sea. , Fatigue damage often occurs under the action of cyclic loading, and the long-term accumulation of fatigue damage will eventually lead to fatigue damage of the structure, which will lead to serious consequences. [0003] Considering cost, construction technology and other reasons, it is of great significance to carry out fatigue analysis on offshore platform structure and prevent acci...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王树青杜君峰宋宪仓李华军常安腾
Owner OCEAN UNIV OF CHINA
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