Magnetic shielding dynamic demagnetization simulation analysis method, optimization method and medium

By constructing a three-dimensional finite element model and applying a geomagnetic bias field and periodic decay excitation, and employing a multi-period step iteration and transient separation solution strategy, the magnetization intensity is decomposed into reversible and irreversible components. This solves the accuracy and efficiency problems of simulation analysis of magnetic shielding devices in existing technologies, and achieves efficient global quantitative evaluation and accurate prediction of residual magnetic field.

CN122452267APending Publication Date: 2026-07-24杭州极弱磁场国家重大科技基础设施研究院
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Patent Information

Application Number
CN202610922606.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing simulation analysis methods for magnetic shielding devices cannot accurately reflect the effects of geomagnetic bias, cannot reproduce multi-period relaxation processes, and lack full-domain quantitative evaluation capabilities, resulting in significant deviations between modeling analysis results and actual operating conditions, as well as low computational efficiency.

Method used

A three-dimensional finite element model was constructed, and a geomagnetic bias field and periodic decay excitation were applied. A multi-period step iteration and transient separation solution strategy was adopted to decompose the magnetization intensity into reversible and irreversible components. The dynamic evolution process of the magnetic shielding material was solved through a dynamic magnetization model and magnetic domain relaxation mechanism, and the residual magnetization and residual magnetic field distribution were calculated.

Benefits of technology

It enables the realistic reproduction of the demagnetization process under geomagnetic conditions, improves the prediction accuracy and efficiency of simulation analysis, provides full-domain quantitative assessment, and enhances the prediction accuracy and computational stability of residual magnetic fields.

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Abstract

The invention relates to a magnetic shielding dynamic demagnetization simulation analysis method, an optimization method and a medium, and the simulation analysis method comprises the steps: constructing a three-dimensional finite element model of a magnetic shielding structure, an internal air domain and an external infinite air domain; applying a magnetic insulation boundary condition to the outer surface of the external infinite air domain, and applying a constant geomagnetic bias field as a global static background field; applying degaussing excitation with period alternation and amplitude index attenuation to the magnetic shielding structure; under the degaussing excitation, based on a dynamic magnetization model, a multi-cycle stepping iteration and transient separation solving strategy is adopted, and the dynamic evolution process of the magnetization intensity of the magnetic shielding material is solved; and after the demagnetization excitation is finished, determining the residual magnetization intensity distribution of the magnetic shielding material, and obtaining the residual magnetic field distribution of the internal air domain based on the residual magnetization intensity distribution, thereby improving the prediction precision and efficiency of the residual magnetic field.
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