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Method for analyzing vibration characteristic of optical fiber composite submarine cables under ocean current scour

A composite technology of submarine cable and optical fiber, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the mechanical vibration state of the submarine cable cannot be obtained, and achieve the effects of low cost, intuitive and effective research, and high efficiency

Inactive Publication Date: 2018-01-26
ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER +2
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Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to solve the problem that the mechanical vibration state of the submarine cable under the current ocean current can not be obtained, and provide an analysis method for the vibration characteristics of the optical fiber composite submarine cable under the ocean current, so as to achieve the purpose of monitoring the submarine cable

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  • Method for analyzing vibration characteristic of optical fiber composite submarine cables under ocean current scour
  • Method for analyzing vibration characteristic of optical fiber composite submarine cables under ocean current scour
  • Method for analyzing vibration characteristic of optical fiber composite submarine cables under ocean current scour

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Embodiment Construction

[0038] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] Such as Figure 10 Shown, the present invention comprises the following steps:

[0040] 1) Finite element modeling of submarine cables under wave force;

[0041] a) The geometric model is established, and the submarine cable is simplified; the conductor shielding layer, the XLPE insulating layer and the insulating shielding layer are combined to form an insulating layer; the semiconducting resistance water tape and the brass tape are ignored; the submarine cable model is simplified to an 8-layer structure , from inside to outside are copper conductor, insulating layer, lead alloy sheath, HDPE sheath, PET, rope layer, armored steel wire and outer layer; and set the length and diameter of the exposed submarine cable;

[0042] b) Selection of unit type;

[0043] Select SOLID185 unit and pipe59 unit; SOLID185 unit constructs th...

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Abstract

The invention discloses a method for analyzing a vibration characteristic of optical fiber composite submarine cables under ocean current scour, and relates to submarine cable analysis methods. Submarine cables are laid on a seabed or seabed sludge generally, are subject to mechanical damage under influence of submarine complex terrains, ocean currents, and tide scour, and there is on a visual andeffective method currently. The method includes the following steps: performing finite element modeling of submarine cables under the action of wave force; performing finite element result data extraction and analysis; performing submarine cable vibration analysis; monitoring a submarine cable situation through optical fiber vibration according to a relation among a displacement, the accelerationand the frequency of an optical unit. The technical scheme can perform dynamics finite element analysis under the action of the wave force, can know the stress acted on each layer of the submarine cables, can provide a theoretical basis for monitoring of the working state of submarine cables by using a distributed optical fiber vibration sensing technology, can complete real-time monitoring of submarine cable vibration through the optical fiber sensing technology, is low in cost, can perform off-site determination, is high in efficiency, and is visual and effective in submarine cable research.

Description

technical field [0001] The invention relates to a submarine cable analysis method, in particular to an analysis method for the vibration characteristics of an optical fiber composite submarine cable under ocean current washing. Background technique [0002] my country has a long coastline and many islands. In order to better utilize and develop island marine resources and meet the construction needs of a large number of projects such as coastal island development, oil platforms, and offshore wind power, submarine cables are used more and more frequently, and the demand is also increasing year by year. However, the complex submarine environment, improper laying or man-made damage make the safe operation of submarine cables face great challenges, and the special environment in which submarine cables are located makes fault maintenance very difficult. It is of great significance to monitor the working status in real time. [0003] Submarine cables are generally laid on the se...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 宣耀伟林晓波汪洋戴涛何旭涛沈耀军
Owner ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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