Pulsed eddy current infrared numerical value simulation method based on frequency domain superposition method and energy equivalent method

Abstract

The invention provides a pulsed eddy current infrared numerical value simulation method based on a frequency domain superposition method and an energy equivalent method. The method is composed of a degradation magnetic vector potential method based on an edge element, a temperature field calculation method based on a node element, the frequency domain superposition method based on fast Fourier transformation and the energy equivalent method based on an energy equivalent principle; when the method is implemented, related numerical value simulation parameters are determined according to a pulsededdy current infrared nondestructive testing experiment and comprise an excitation coil size, an excitation waveform, a size of a detected test sample, material physical properties of the detected test sample, a lift-off distance and the like; then a pulsed eddy current field numerical value calculation program is developed based on the degradation magnetic vector potential method and the frequency domain superposition method, and the related numerical value simulation parameters are imported and are calculated to obtain an eddy current distribution condition of the detected test sample; finally, a temperature field calculation program is developed based on the node element and the energy equivalent method and a calculated eddy current value in the detected test sample is imported and iscalculated to obtain a temperature distribution condition in the detected test sample.

Description

technical field [0001] The invention relates to the field of numerical calculation of pulsed eddy current infrared nondestructive detection signals, in particular to a pulsed eddy current infrared numerical simulation method based on a frequency domain superposition method and an energy equivalent method. Background technique [0002] In the late 1970s, the development of infrared cameras made it possible to directly detect large-scale temperature changes. At present, although traditional excitation methods such as flashlights are still mostly used as excitation sources for thermal imaging technology, new excitation methods such as eddy current excitation and laser excitation are gradually becoming popular. Among them, the pulsed eddy current infrared thermal imaging technology has been applied in many aspects because of the direct interaction between the heating source and the defect. The temperature history of the sample using pulsed eddy current excitation can be divided...

AI Technical Summary

Problems solved by technology

Due to the complex shape of the excitation source used in the pulsed eddy current infrared thermal imaging technology, when the calculation scale of the engineering electromagnetic field problem is large, it is difficult to accurately match the three-dimensional grid with the physical structure of the excitation source

In addition, because the pulsed eddy current infrared excitation has the characteristics of short excitation time and high excitation frequency, this makes the traditional induction heating numerical simulation method no longer applicable to the pulsed eddy current infrared numerical simulation problem.

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