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Combination method of element combination for defect flux leakage signal perpendicular to magnetization direction

A technology of perpendicular magnetization and magnetization direction, applied in design optimization/simulation, instrumentation, calculation, etc., can solve problems such as representation, and achieve the effect of simple calculation model, fast speed, and improved calculation efficiency

Active Publication Date: 2019-07-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a serious nonlinear relationship between the target defect size and its magnetic flux leakage signal, so it is impossible to use the pre-calculated known defect magnetic flux leakage signal or its combination to directly represent the target defect magnetic flux leakage signal
Currently there is no method to calculate the MFL signal of the target defect based on the pre-calculated MFL signal of known defects

Method used

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  • Combination method of element combination for defect flux leakage signal perpendicular to magnetization direction
  • Combination method of element combination for defect flux leakage signal perpendicular to magnetization direction
  • Combination method of element combination for defect flux leakage signal perpendicular to magnetization direction

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Embodiment 1

[0057] In this embodiment, the method for solving the unit combination of the defect magnetic flux leakage signal perpendicular to the magnetization direction includes the following steps:

[0058] 1. Select the unit defect size according to the target defect size. Specifically include: the length d of the target defect 1 =12mm, width d 2 = 24mm and depth d 3 =3.6mm, the target defect is the combination of unit defects along the perpendicular magnetization direction; the selected unit defect size is: length a 1 = d 1 =12mm, width a 2 = d 2 / 2 = 12mm and depth a 3 = d 3 = 3.6 mm. Among them, a 1 and d 1 is the length of the defect, along the magnetization direction; a 2 and d 2 is the width of the defect, perpendicular to the magnetization direction; a 3 and d 3 is the depth of the defect along the thickness of the material being tested.

[0059] 2. Obtain the unit defect magnetic flux leakage signal H a (x 1 ,x 2 ,x 3 ), where the unit defect flux leakage si...

Embodiment 2

[0072] In this embodiment, the method for solving the unit combination of the defect magnetic flux leakage signal perpendicular to the magnetization direction includes the following steps:

[0073] Step 1: Select the unit defect size according to the target defect size. Specifically include: the length d of the target defect 1 =24mm, width d 2 = 48mm and depth d 3 = 4.8mm, the target defect is the combination of unit defects along the perpendicular magnetization direction; the selected unit defect size is: length a 1 = d 1 =24mm, width a 2 = d 2 / 2 = 24mm and depth a 3 = d 3 = 4.8 mm. Among them, a 1 and d 1 is the length of the defect, along the magnetization direction; a 2 and d 2 is the width of the defect, perpendicular to the magnetization direction; a 3 and d 3 is the depth of the defect along the thickness of the material being tested.

[0074] Step 2: Obtain the unit defect magnetic flux leakage signal H a (x 1 ,x 2 ,x 3 ), where the unit defect flux...

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Abstract

The invention discloses a flaw magnetic leakage signal perpendicular magnetization directional unit combined solving method. The flaw magnetic leakage signal perpendicular magnetization directional unit combined solving method comprises the following steps of S1, selecting a unit flaw dimension according to a preset target flaw dimension; S2, acquiring a unit flaw magnetic leakage signal; S3, performing frequency domain transformation on the unit flaw magnetic leakage signal to obtain a transformed frequency domain signal; S4, performing translation transformation on the transformed frequency domain signal in a perpendicular magnetization direction to obtain two translation-transformed frequency domain signals; S5, performing combination on the two frequency domain signals translation-transformed in the perpendicular magnetization direction to obtain a combined frequency domain signal; S6, performing reciprocal frequency domain transformation on the combined frequency domain signal to obtain a target flaw magnetic leakage signal. The flaw magnetic leakage signal perpendicular magnetization directional unit combined solving method saves complicated calculation such as finite element calculation on target flaws and has the advantages of simplicity in calculation model and high speed.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a method for solving defect flux leakage signal perpendicular to magnetization direction unit combination. Background technique [0002] The calculation of defect magnetic flux leakage signal is the basis of magnetic flux leakage detection and defect evaluation. Due to the incomplete mapping of the defect magnetic flux leakage signal to the defect size, it is usually necessary to construct a forward model to solve the magnetic flux leakage signal based on the known defect size, and iteratively update the defect size parameters in the model to approach the target magnetic flux leakage signal, so as to realize the defect Inversion of size. Therefore, how to quickly and accurately calculate the defect magnetic flux leakage signal is of great significance for magnetic flux leakage detection and defect evaluation. [0003] In the existing related technologies, the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 黄松岭彭丽莎赵伟张宇王珅
Owner TSINGHUA UNIV