Form measurement method and measurement device for mooring foundation installed cables in seabed soil

Abstract

The invention relates to the technical field of marine monitoring, and especially relates to a measuring method and a measuring device for measuring the shape of a mooring foundation installation cable in the seabed soil. The method comprises the following steps: installing multiple fiber grating strain sensors on a mooring foundation installation cable; making the mooring foundation installation cable drag a mooring foundation into the soil; collecting the strain values measured by the multiple fiber grating strain sensors in different measuring points; obtaining the curvature value of each measuring point according to the strain values; obtaining first coordinate values of two adjacent measuring points and a second coordinate value of an interpolation point between the two adjacent measuring points through recursion based on the curvature values and the length of the cable between two adjacent fiber grating strain sensors among the multiple fiber grating strain sensors; and obtaining a real-time shape curve of the mooring foundation installation cable through fitting based on the first coordinate values and the second coordinate values. With the method and the device, the change in the shape of the embedded cable can be observed in real time and dynamically. The method and the device are of high measurement precision, and can be applied to field measurement.

Description

technical field [0001] The invention relates to the technical field of marine engineering monitoring, in particular to a method and a measuring device for measuring the shape of cables installed on a mooring foundation in seabed soil. Background technique [0002] With the gradual development of offshore oil and gas resources in the direction of deep water and ultra-deep water, large-scale floating production systems such as semi-submersible platforms, floating production storage and offloading (FPSO), and single column (SPAR) platforms are gradually increasing. The research on the floating mooring foundation has also been paid more and more attention. The taut mooring system made of synthetic fiber materials has increasingly become a major mooring method for deep-sea development platforms. The new dragging anchor is a mooring foundation matched with the taut mooring system. It has excellent bearing capacity performance and comprehensive advantages, and occupies an importan...

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Problems solved by technology

[0004] In the prior art, the research on the morphological characteristics of the cables installed on the mooring foundation in the seabed soil is mainly based on numerical methods, such as the derivation of theoretical equations such as its geometric equation and embedded cable length equation, and the physical research on its morphological measurement is relatively Very few, in a relatively scarce stage, some researchers use manual sand splitting, rope pulling, and static test methods to measure, which is not accurate enough, and cannot achieve dynamic and real-time effects, and cannot be applied to on-site measurement

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