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Method for determining force-magnetic characteristic parameters of material for strong and weak magnetic detection

A technology for parameter determination and magnetic properties, applied in the field of non-destructive testing, can solve problems such as stress identification result errors, and achieve the effect of broad engineering application prospects

Pending Publication Date: 2022-03-01
PIPECHINA SOUTH CHINA CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method for determining the force and magnetic characteristic parameters of materials used in the detection of strong and weak magnetic fields, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of effective identification and quantitative detection of stress in the detection of strong and weak magnetic fields. There is a problem of error in the stress identification result; the method of the present invention can accurately determine the force and magnetic characteristic parameters of the material, and provide a basis for the accurate identification of stress in the detection of strong and weak magnetic fields

Method used

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  • Method for determining force-magnetic characteristic parameters of material for strong and weak magnetic detection
  • Method for determining force-magnetic characteristic parameters of material for strong and weak magnetic detection

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Embodiment 1

[0026] Embodiment 1: as attached figure 1 As shown, the method for determining the force and magnetic characteristic parameters of materials for strong and weak magnetic field detection includes the following steps:

[0027] The first step is to use the J-A model to calculate the relationship between the magnetization of the pipeline sample to be tested and the strength of the external magnetic field under different stresses;

[0028] The second step is to obtain the hysteresis loop I under different stresses according to the relationship between the external magnetic field strength and the magnetization strength calculated in the first step;

[0029] The third step is to intercept the pipeline sample to be tested, and measure the hysteresis loop II of the pipeline sample to be tested intercepted under the stress-free state through the hysteresis loop test;

[0030] The fourth step is to approximate the obtained hysteresis loop I and hysteresis loop II using the particle swar...

Embodiment 2

[0031] Embodiment 2: as attached image 3 Shown, as the optimization of above-mentioned embodiment, in the 4th step, the method that adopts particle swarm algorithm approximation is as follows: J-A model calculation data and the experimental data that hysteresis loop test gathers are approximated, obtain described calculation data and The mean square error of the experimental data, when the mean square error is less than the set value or the mean square error is the smallest, output the force and magnetic characteristic parameters of the J-A model.

Embodiment 3

[0032] Embodiment 3: as attached image 3 As shown, as the optimization of the above-mentioned embodiment 2, when the mean square error is not less than the set value or does not reach the minimum value, continue to use the particle swarm optimization algorithm for approximation until the mean square error is less than the set value or reaches the minimum value or the number of approximation calculations Reached the calculation times set value.

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Abstract

The invention relates to the technical field of nondestructive testing, in particular to a method for determining force-magnetic characteristic parameters of a material for strong and weak magnetic testing, which comprises the following steps of: approaching a hysteresis loop I under different stresses and a hysteresis loop II of a sample in an unstressed state by adopting a particle swarm algorithm; the J-A model parameter when the mean square error of the data on the two curves is smaller than a set value or minimum is the force-magnetic characteristic parameter of the material. According to the method for determining the force-magnetic characteristic parameters of the material for strong and weak magnetic detection, the force-magnetic characteristic parameters of the material in strong and weak magnetic detection can be determined, and accurate hysteresis loops of the material under different stresses can be determined by applying the force-magnetic characteristic parameters calculated by the method to a J-A model; the stress in strong and weak magnetic detection can be identified by using the relationship between the stress and the hysteresis loop, so that the method for determining the force-magnetic characteristic parameters of the material for strong and weak magnetic detection has a very wide engineering application prospect.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, and relates to a method for determining the parameters of the force and magnetic properties of materials used in the detection of strong and weak magnetic fields. Background technique [0002] As an emerging non-destructive testing technology, the strong and weak magnetic detection technology integrates the research content of ferromagnetism, non-destructive testing, metal histology and other fields, and because this technology supports non-contact online detection, there is no need to carry out material inspection before testing. Pretreatment and detection have no effect on material properties, the detection signal is obvious, and the stress can be effectively identified, so it is used in engineering projects such as pipeline inspection. [0003] Strong and weak magnetic detection includes two parts: strong magnetic detection and weak magnetic detection. The signal detected by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
CPCG01R33/12
Inventor 田野刘剑慕进良赵康徐春燕李坤高涛丁融廉正罗宁张贺
Owner PIPECHINA SOUTH CHINA CO
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