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Model checking method of static magnetic field prediction model related to underwater corrosion of ships

A technology of static magnetic field and prediction model, which is applied in electrostatic field measurement, weather resistance/light resistance/corrosion resistance, measuring devices, etc. It can solve problems such as unpredictable model verification, difficult magnetic field distinction, etc., and achieves easy measurement process and high accuracy , the effect of great engineering significance

Inactive Publication Date: 2018-04-20
NAVAL UNIV OF ENG PLA
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Problems solved by technology

However, it is difficult to distinguish the corrosion-related magnetic field of the ship model from the magnetic field generated by the magnetism of the material in the laboratory, which makes it impossible to directly verify the prediction model by measuring the corrosion-related magnetic field of the ship model

Method used

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  • Model checking method of static magnetic field prediction model related to underwater corrosion of ships
  • Model checking method of static magnetic field prediction model related to underwater corrosion of ships
  • Model checking method of static magnetic field prediction model related to underwater corrosion of ships

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing of description and specific embodiment:

[0039] The invention provides a method for checking the model of a ship's underwater corrosion-related static magnetic field prediction model, which is characterized in that it includes the following steps:

[0040] first step, such as figure 1 As shown, the seawater and marine environment are simulated in the laboratory, and the conductivity of the self-prepared simulated seawater is σ 1 =0.0814S m -1 . Build the ship model 7 and its ICCP system according to the scale of 1:100. 20 measuring electrodes 8 are used, with a distance of 8 cm between them, arranged in an array to form a measuring array of electric field sensors, and arranged on a plane 50 cm below the water surface below the ship model 7 to measure the scalar potential distribution on the plane. The measuring electrode 8 is a 218-type Ag-AgCl reference electrode from Sh...

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Abstract

The invention provides a model verification method for a prediction model of an underwater ship corrosion-related static magnetic field. The method comprises the following steps: firstly, simulating seawater and ocean environments in a lab, constructing a ship model and an impressed current cathodic protection system of the ship model according to a certain scale ratio, measuring electric scalar potential distribution below the ship model, and constructing the horizontal current line prediction model of the underwater ship corrosion-related static magnetic field; secondly, loading a horizontal current line in the same experimental environment to replace the ship model, repeatedly measuring electric scalar potential in the same position below the ship model, and synchronously measuring magnetic field distribution in water; thirdly, comparing the measured electric scalar potential of the current line with a measurement result of the ship model to prove the feasibility of field source equivalency; comparing the measured magnetic field with a prediction result of the prediction model to prove the correctness of a prediction process of the prediction model. According to the method, the feasibility of field source equivalency is proved by comparing the electric field distribution, and the correctness of the prediction process is proved by comparing the magnetic field distribution, so that a model verification problem of the prediction model of the underwater ship corrosion-related static magnetic field is solved.

Description

technical field [0001] The invention relates to the field of feature prediction of underwater electromagnetic fields of ships, in particular to a method for checking models of static magnetic field prediction models related to underwater corrosion of ships. Background technique [0002] When a ship sails in a marine environment, due to the corrosion of construction materials and the anti-corrosion measures taken, a steady current will appear in the seawater around the hull, which is called corrosion current or anti-corrosion current. The main part of the corrosion current flows from the steel hull through the seawater to the copper propeller, then flows through the propeller shaft, and returns to the hull through various conductive connections to form a closed loop; the main part of the anti-corrosion current flows from the anode of the anti-corrosion system to the The protected hull and propeller, and then through the hull or propeller shaft, return to the negative pole of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/14G01N17/02
Inventor 陈聪杨海彬谭浩蒋治国
Owner NAVAL UNIV OF ENG PLA
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