The distribution of local magnetic force is described with an equivalent node force, which is derived from an extended application of virtual work principle to FEM node.
该法将虚位移原理推广应用于有限单元的节点，从而得到用以描述局部电磁力分布的等效节点力。
In addition, the annular elements may be extended into the FEM and the Charge Simulation Method.
该法还可推广于模拟电荷法及有限元法中。
By introducing the FEM, the mixed method is extended to perform finite element reliability analysis.
通过引入有限元方法，混合分析法可适用于结构可靠度问题。
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