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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。
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.
等效附加应力法根据附加节点力计算方法的不同分别对应整体式和组合式方法。
Equivalent additional stress method can be the same with integral method or combined method depending on the equivalent method of additional nodal force calculated.
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