Method for calculating structure stress of floating ocean structure based on spectrum analysis method

Abstract

The invention provides a method for calculating a structure stress of a floating ocean structure based on a spectrum analysis method, and belongs to the technical field of ocean floating structure strength analysis and assessment. The method for calculating the structure stress of the floating ocean structure based on the spectrum analysis method comprises the following steps of 1, building a model; 2, calculating a structure stress transfer function; 3, parameterizing a wave spectrum; 4, calculating an energy spectrum of the structure stress; 5, calculating a short-term sea condition spectrum moment; 6, calculating a short-term probability density function; 7, calculating a wave scatter diagram; 8, calculating a wave direction probability; 9, calculating a long-term probability density function; 10, calculating a long-term statistics value of the structure stress; and 11, performing check. According to the method, not only an operation sea area environment but also the total and local strength of the floating ocean structure are considered, so that the consideration is more comprehensive and the adaptability is higher; and through calculation of a computer, the error problem caused by manual operation is eliminated.

Description

technical field [0001] The invention relates to the technical field of strength analysis and evaluation of marine floating structures, in particular to a method for calculating the structural stress of floating marine structures based on a spectrum analysis method. Background technique [0002] With the progress of human society and the depletion of land resources, human society has gradually begun to develop and utilize marine resources, such as offshore oil and gas development, marine mineral mining, and offshore nuclear energy. Since the development and utilization of the ocean is still in its infancy, and the development of marine activities relies on the floating marine structure as a platform, with the diversification of platform functions, the traditional ship-shaped floating marine structure can no longer meet various needs. The needs of various marine developments lead to various shapes of floating marine structures, such as cylindrical, column-stabilized and cubic....

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Problems solved by technology

[0004] In view of the above-mentioned problems existing in the prior art, it is now intended to provide a method for calculating the structural stress of floating marine structures based on spectral analysis method, combined with the marine environmental conditions of the operating sea area of ​​floating marine structures, based on the expected probability level, Statistically calculate the structural stress at any position of the floating marine structure, and through finite element calculation, more comprehensively evaluate the structural strength of the floating marine structure at the expected probability level, and solve the incompleteness and adaptability of the current evaluation method sex problem

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