Intelligent optical fiber ring skin monitoring method for online diagnosis of submarine pipeline structure damage

Abstract

The invention provides an intelligent optical fiber ring skin monitoring method for the on-line diagnosis of submarine pipeline structure damage and belongs to the technical field of structure intelligent health monitoring and detection. A hyperelastic silicone rubber ring skin layer is additionally arranged on a subsea pipeline structure; an annular grating string and an axially U-shaped ring distributed optical fiber are constructed on the hyperelastic silicone rubber annular skin layer and are arranged inside and outside, the thickness of the hyperelastic silicone rubber ring skin layer isdesigned according to the strain transfer theory so as to ensure the optimal deformation transfer efficiency and the optimal bonding strength between an optical fiber sensing element and a ring skin colloid, and an intelligent optical fiber ring skin sensing layer with an embedded optical fiber sensing network is formed. The invention develops an intelligent optical fiber ring skin monitoring method for the online diagnosis of local damage of the subsea pipeline structure and the quantitative characterization of overall deformation information, effective technical means and scientific data accumulation are provided for damage online diagnosis, maintenance strategy making and subsea pipeline structure inversion design in the long-distance subsea pipeline operation process, and safe operation and damage prediction of the subsea pipeline structure are served.

Description

technical field [0001] The invention belongs to the field of structural intelligent health monitoring and detection, and relates to an optical fiber sensing testing method for tracking, monitoring and identifying local damage of a marine pipeline structure. Background technique [0002] With the growth of domestic energy demand, major energy projects such as deep-sea resource development and west-to-east gas transmission have promoted the construction of a large number of oil and gas pipelines. For example, the development of oil and gas resources in the South China Sea has gradually expanded to a deep sea of ​​about 3,000 meters, and a large number of deep-sea risers have been put into use as the lifeline of oil and gas transportation, and the cost of oil and gas pipelines is extremely high. With the increase in the number of new and overdue marine pipelines, oil spill accidents from marine pipelines occur frequently. Therefore, the real structural resistance, safety status...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an intelligent optical fiber ring skin monitoring method for on-line diagnosis of local damage of the sea pipe structure and quantitative representation of the overall information, so as to solve the problem of lack of online damage diagnosis technology, poor long-term stability and durability test technology, and external stickers during the safe operation of the sea pipe structure. Engineering application problems such as test failure caused by partial interface peeling of optical fiber sensor devices, local random damage is unpredictable and difficult to identify, and the whole process monitoring information of the overall deformation is difficult to obtain.

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