Fiber bragg grating sensing monitoring method for submarine pipeline three-dimensional form reconstruction

Abstract

The invention provides a fiber bragg grating sensing monitoring method for submarine pipeline three-dimensional form reconstruction, and belongs to the technical field of structure intelligent healthmonitoring and detection. According to the overall and local deformation test requirements of the subsea pipeline, the spacing of the fiber grating strings, the cross-shaped structure, the spatial arrangement of the embedded CFRP cloth and the layer number and thickness of the CFRP cloth are designed. High-strength epoxy resin glue is designed according to the submarine pipeline deformation distribution characteristics and the strain transfer theory to fix the CFRP cloth packaged cross-shaped fiber grating string probe to the outer wall of the submarine pipeline. The CFRP cloth packaged cross-shaped fiber bragg grating string adhered and cured by the high-strength epoxy resin adhesive forms an intelligent CFRP grating structure on the pipe wall, and the embedded fiber bragg grating sensingnetwork monitors the circumferential and axial strain of the subsea pipeline. According to the monitoring method provided by the invention, a quasi-distributed device in the process is changed into an effective device and a technical method are provided for long-term continuous monitoring of three-dimensional form information, structural safety state evaluation and damage evolution rule exploration in the service process of the subsea pipeline structure.

Description

technical field [0001] The invention belongs to the technical field of structural intelligent health monitoring and detection, and relates to a fiber grating sensing monitoring method for three-dimensional shape reconstruction of sea pipes. Background technique [0002] With the rapid development of my country's economy, the demand for energy is also rising rapidly, especially in terms of oil resources. However, the growth of my country's onshore oil production is slow, and the proven oil reserves have shown a downward trend year by year. The development of offshore oil and the construction of oil and gas pipelines are particularly important. The submarine pipeline is the lifeline of oil and gas transportation, and its construction cost is extremely high. Due to the influence of the complex environment in the middle and late stages of its service, accidents such as oil leakage from the submarine pipeline occur frequently. For example, in 1998, the pipeline in Pinghu Oilfie...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fiber grating sensor monitoring method that takes into account the reconstruction of the overall and local three-dimensional shape of the sea pipe structure, and solve the problem of continuous monitoring of the overall and local three-dimensional shape of the sea pipe structure during the safe operation of the sea pipe structure, and long-term stability and durability testing technology Engineering application problems such as test failure caused by interface peeling of local externally attached optical fiber sensor devices, and difficulty in obtaining information on the entire process of sea pipe deformation

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