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前言本文提出用有限元法根据外部磁化埸条件和已控制的磁性体形态及磁化率参数计算磁性体内部的有效磁化强度及其在外部空间引起的磁异常.方法实质是求解偏微分方程边值问题的数值解.因为未引入均匀磁化等近似假定,所得到的解能满足磁性体内外的微分方程和边界条件及分界面条件(在数值计算允许的精度范围内),所以这种解包含了磁性体复杂形状引起的退磁影响、剩余磁化对感应磁化的影响、多个磁性体相互间的磁作用以及磁化率分布不均匀的影响.这种方法适用于非均匀磁化条件下的正演计算,为精确计算有效磁化强度提供了一种新途径,可以提高磁异常计算的精确度.
Preface This paper proposes to calculate the effective magnetization inside the magnetic body and the magnetic anomaly caused by it in the external space by using the finite element method according to the external magnetization 埸 condition and the controlled magnetic body shape and the magnetic susceptibility parameter.The method is essentially to solve the partial differential equation boundary value The numerical solution of the problem is that since the approximate assumption of uniform magnetization is not introduced and the resulting solution satisfies the differential equations and the boundary conditions and the interface conditions (within the allowable accuracy of numerical calculations) both inside and outside the magnetic body, The influence of the demagnetization caused by the complex shape of the magnetic body, the influence of the remanent magnetization on the induced magnetization, the magnetic effect of the plurality of magnetic bodies on each other, and the uneven distribution of the magnetic susceptibility. This method is suitable for the forward calculation under the non-uniform magnetization condition, It provides a new way to accurately calculate the effective magnetization, which can improve the accuracy of magnetic anomaly calculation.