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用常规的虚磁荷法计算磁各向异性体的磁异常是十分困难的,甚至是不可能的。王书惠最近提出用有限元法计算磁各向异性体的磁异常的方法。有限元法不仅考虑到磁各向异性效应,而且还考虑到退磁效应和剩余磁性对感应磁性的影响,因而有限元法给出更准确的结果。本文简化了求解磁各向异性体的磁位的数学提法及相应的变分理论,并给出有限元法的具体计算公式。此外,我们在单元中采用二次函数插值,有限元法的运算结果可直接给出各
It is very difficult, even impossible, to calculate the magnetic anomaly of the magnetic anisotropy by the conventional virtual magnetic charge method. Wang Shuhui recently proposed finite element method to calculate the magnetic anisotropy of magnetic anisotropy method. Finite element method not only considers the magnetic anisotropy, but also takes into account the demagnetization effect and residual magnetism on the induced magnetism, so the finite element method gives more accurate results. In this paper, we simplified the mathematical formulation and the corresponding variational theory for solving the magnetic anisotropy of magnetic anisotropy, and gave the concrete formula of finite element method. In addition, we use the quadratic function interpolation in the unit, and the result of the finite element method can be directly given