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Vortex flow transducer evaluation method based on fractal information dimensions

An eddy current sensor and information dimension technology, applied in scientific instruments, instruments, analytical materials, etc., can solve the problems of decreased sensor sensitivity and high probability of missing detection

Inactive Publication Date: 2016-08-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, when the angle between the direction of the eddy current and the direction of the crack, especially the direction of the micro-crack is small, the disturbance will be extremely weak, and the sensitivity of the sensor to the crack will also decrease, resulting in a high probability of missed detection

Method used

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  • Vortex flow transducer evaluation method based on fractal information dimensions
  • Vortex flow transducer evaluation method based on fractal information dimensions
  • Vortex flow transducer evaluation method based on fractal information dimensions

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Embodiment Construction

[0035] figure 1 Shown is the establishment of the simulation model. Under the same simulation conditions, different types of eddy current sensors induce different eddy current distributions. Such as figure 2 and image 3 Respectively, the eddy current distribution induced by the circular excitation coil and the third-order Koch fractal excitation coil of the same overall size. Since the crack detection ability of the eddy current sensor depends on the interaction strength between the crack and the eddy current, and this strength depends on the relationship between the direction of the eddy current and the crack direction, that is, the closer the included angle is to 90 degrees, the better the detection ability. powerful. When the crack size is smaller than the overall size of the excitation curve of the sensor, the strength of its interaction with the eddy current will decrease as the crack length decreases. Compared figure 2 and image 3 ,As can be seen, image 3 The...

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Abstract

The invention discloses a vortex flow transducer evaluation method based on fractal information dimensions and relates to an optimization algorithm of a stimulation curve in planar vortex flow transducer design. Information dimensions in a fractal geometry theory are adopted, finite element calculation is performed on vortex flow distribution produced on the perfect conductor surface by an exciting coil, information entropy, distributed in different directions, of virtual cracks at different scales in the strongest vortex flow position is obtained, and information dimensionality of the information entropy changing with virtual crack scale variation is obtained. The fractal information dimension is taken as an optimization method of a vortex flow transducer stimulation curve, and the changing speed of the intensity of the mutual action between vortex flow and cracks induced by the stimulation curve with reduction of crack lengths is evaluated.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic non-destructive testing, and relates to a method for selecting an optimal excitation curve of a planar eddy current sensor for crack detection in conductor components. Background technique [0002] Eddy current testing plays an irreplaceable role in non-destructive testing during the production and service of mechanical products due to its advantages of low cost, fast speed and good environmental adaptability. Planar flexible eddy current sensor is a commonly used eddy current sensor for curved surface component detection. Its excitation curve tends to develop in the direction of single turn or several turns. However, the influence of the shape of excitation curve on the performance of eddy current sensor has to be considered. [0003] The essence of eddy current sensors to detect cracks is the interaction between eddy currents and cracks, that is, the eddy current is disturbed by cracks, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01N27/90G01N27/9013G01N27/904
CPCG01N27/9046G06F30/20
Inventor 张卫民陈国龙庞炜涵曹新愿章凯
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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