A hot spot stress estimation method for offshore floating platform based on response surface model

Abstract

The invention relates to a method for estimating hot spot stress of an ocean floating platform based on a response surface model, comprising: step S1: establishing a response surface model of the hot spot stress of the structure of the ocean floating platform, according to the nonlinear influence of the hot spot stress of the structure of the ocean floating platform , introduce control parameters; Step S2: establish a numerical model for stress analysis of the marine floating platform, change the values ​​of the influencing factors through numerical calculation methods, obtain the hot spot stress under the corresponding conditions, and use regression equations to fit the relationship between the hot spot stress and each factor , determine the corresponding coefficients of the control parameters, and establish the hot spot stress calculation formula according to the corresponding coefficients; Step S3: monitor the wave environment at the location of the ocean floating platform, select the spatial near-field measuring points of the hot spots to carry out stress monitoring, and analyze the results. Enter the formula to obtain the hot spot stress at the current sea state. Compared with the prior art, the present invention has the advantages of less error, more comprehensive monitoring data, and more authoritative calculation results.

Description

technical field [0001] The invention relates to the field of ships and ocean engineering, in particular to a hot spot stress estimation method for an ocean floating platform based on a response surface model. Background technique [0002] Offshore floating platforms are large-scale offshore structures used for offshore exploration, drilling and production. They have the characteristics of strong mobility and complex structure. It is subjected to wind, wave and current loads in the external marine environment at sea, which will generate large stress at the hot spots where the structure is prone to damage, affecting the safety and usability of the structure. [0003] In order to obtain the hot spot stress at the key structures of the offshore floating platform and solve the difficult problem of direct monitoring of the hot spot stress of complex structures, a relatively accurate and reasonable hot spot stress estimation method is required. In the prior art, for the method of ...

AI Technical Summary

Problems solved by technology

It bears the wind, wave and current loads in the external marine environment at sea, which will generate greater stress at the hot spots where the structure is prone to damage, affecting the safety and usability of the structure

[0003] In order to obtain the hot spot stress at the key structure of the offshore floating platform and solve the problem that the hot spot stress of complex structures is difficult to monitor directly, a relatively accurate and reasonable hot spot stress calculation method is needed

In the prior art, the method for estimating the hot spot stress mainly selects the stress of the measuring point at a specific location near the hot spot as the influencing factor, and uses the linear extrapolation method to estimate the hot spot stress, but this method does not consider the wave load characteristics, and considers There are too few influencing factors, and strict requirements are placed on the location of the measuring point

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